Added BME280 lib

lib/Adafruit_BME280_Library/.github/ISSUE_TEMPLATE.md

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+Thank you for opening an issue on an Adafruit Arduino library repository.  To
+improve the speed of resolution please review the following guidelines and
+common troubleshooting steps below before creating the issue:
+
+- **Do not use GitHub issues for troubleshooting projects and issues.**  Instead use
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lib/Adafruit_BME280_Library/.github/PULL_REQUEST_TEMPLATE.md

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+Thank you for creating a pull request to contribute to Adafruit's GitHub code!
+Before you open the request please review the following guidelines and tips to
+help it be more easily integrated:
+
+- **Describe the scope of your change--i.e. what the change does and what parts
+  of the code were modified.**  This will help us understand any risks of integrating
+  the code.
+
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+  doesn't apply to a supported platform of the library please mention it.
+
+- **Please run any tests or examples that can exercise your modified code.**  We
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+After reviewing the guidelines above you can delete this text from the pull request.

lib/Adafruit_BME280_Library/.github/workflows/githubci.yml

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+name: Arduino Library CI
+
+on: [pull_request, push, repository_dispatch]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2
+      with:
+         repository: adafruit/ci-arduino
+         path: ci
+
+    - name: pre-install
+      run: bash ci/actions_install.sh
+
+    - name: test platforms
+      run: python3 ci/build_platform.py main_platforms
+
+    - name: clang
+      run: python3 ci/run-clang-format.py -e "ci/*" -e "bin/*" -r . 
+
+    - name: doxygen
+      env:
+        GH_REPO_TOKEN: ${{ secrets.GH_REPO_TOKEN }}
+        PRETTYNAME : "Adafruit BME280 Library"
+      run: bash ci/doxy_gen_and_deploy.sh

lib/Adafruit_BME280_Library/Adafruit_BME280.cpp

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+/*!
+ * @file Adafruit_BME280.cpp
+ *
+ * @mainpage Adafruit BME280 humidity, temperature & pressure sensor
+ *
+ * @section intro_sec Introduction
+ *
+ *  Driver for the BME280 humidity, temperature & pressure sensor
+ *
+ * These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+ * to interface.
+ *
+ * Designed specifically to work with the Adafruit BME280 Breakout
+ * ----> http://www.adafruit.com/products/2652
+ *
+ *  Adafruit invests time and resources providing this open source code,
+ *  please support Adafruit and open-source hardware by purchasing
+ *  products from Adafruit!
+ *
+ * @section author Author
+ *
+ * Written by Kevin "KTOWN" Townsend for Adafruit Industries.
+ *
+ * @section license License
+ *
+ * BSD license, all text here must be included in any redistribution.
+ * See the LICENSE file for details.
+ *
+ */
+
+#include "Adafruit_BME280.h"
+#include "Arduino.h"
+
+/*!
+ *  @brief  class constructor
+ */
+Adafruit_BME280::Adafruit_BME280() {}
+
+/*!
+ *   @brief  class constructor if using hardware SPI
+ *   @param  cspin the chip select pin to use
+ *   @param  *theSPI
+ *           optional SPI object
+ */
+Adafruit_BME280::Adafruit_BME280(int8_t cspin, SPIClass *theSPI) {
+  spi_dev = new Adafruit_SPIDevice(cspin, 1000000, SPI_BITORDER_MSBFIRST,
+                                   SPI_MODE0, theSPI);
+}
+
+/*!
+ *   @brief  class constructor if using software SPI
+ *   @param cspin the chip select pin to use
+ *   @param mosipin the MOSI pin to use
+ *   @param misopin the MISO pin to use
+ *   @param sckpin the SCK pin to use
+ */
+Adafruit_BME280::Adafruit_BME280(int8_t cspin, int8_t mosipin, int8_t misopin,
+                                 int8_t sckpin) {
+  spi_dev = new Adafruit_SPIDevice(cspin, sckpin, misopin, mosipin);
+}
+
+Adafruit_BME280::~Adafruit_BME280(void) {
+  if (spi_dev) {
+    delete spi_dev;
+  }
+  if (i2c_dev) {
+    delete i2c_dev;
+  }
+  if (temp_sensor) {
+    delete temp_sensor;
+  }
+  if (pressure_sensor) {
+    delete pressure_sensor;
+  }
+  if (humidity_sensor) {
+    delete humidity_sensor;
+  }
+}
+
+/*!
+ *   @brief  Initialise sensor with given parameters / settings
+ *   @param addr the I2C address the device can be found on
+ *   @param theWire the I2C object to use, defaults to &Wire
+ *   @returns true on success, false otherwise
+ */
+bool Adafruit_BME280::begin(uint8_t addr, TwoWire *theWire) {
+  if (spi_dev == NULL) {
+    // I2C mode
+    if (i2c_dev)
+      delete i2c_dev;
+    i2c_dev = new Adafruit_I2CDevice(addr, theWire);
+    if (!i2c_dev->begin())
+      return false;
+  } else {
+    // SPI mode
+    if (!spi_dev->begin())
+      return false;
+  }
+  return init();
+}
+
+/*!
+ *   @brief  Initialise sensor with given parameters / settings
+ *   @returns true on success, false otherwise
+ */
+bool Adafruit_BME280::init() {
+  // check if sensor, i.e. the chip ID is correct
+  _sensorID = read8(BME280_REGISTER_CHIPID);
+  if (_sensorID != 0x60)
+    return false;
+
+  // reset the device using soft-reset
+  // this makes sure the IIR is off, etc.
+  write8(BME280_REGISTER_SOFTRESET, 0xB6);
+
+  // wait for chip to wake up.
+  delay(10);
+
+  // if chip is still reading calibration, delay
+  while (isReadingCalibration())
+    delay(10);
+
+  readCoefficients(); // read trimming parameters, see DS 4.2.2
+
+  setSampling(); // use defaults
+
+  delay(100);
+
+  return true;
+}
+
+/*!
+ *   @brief  setup sensor with given parameters / settings
+ *
+ *   This is simply a overload to the normal begin()-function, so SPI users
+ *   don't get confused about the library requiring an address.
+ *   @param mode the power mode to use for the sensor
+ *   @param tempSampling the temp samping rate to use
+ *   @param pressSampling the pressure sampling rate to use
+ *   @param humSampling the humidity sampling rate to use
+ *   @param filter the filter mode to use
+ *   @param duration the standby duration to use
+ */
+void Adafruit_BME280::setSampling(sensor_mode mode,
+                                  sensor_sampling tempSampling,
+                                  sensor_sampling pressSampling,
+                                  sensor_sampling humSampling,
+                                  sensor_filter filter,
+                                  standby_duration duration) {
+  _measReg.mode = mode;
+  _measReg.osrs_t = tempSampling;
+  _measReg.osrs_p = pressSampling;
+
+  _humReg.osrs_h = humSampling;
+  _configReg.filter = filter;
+  _configReg.t_sb = duration;
+  _configReg.spi3w_en = 0;
+
+  // making sure sensor is in sleep mode before setting configuration
+  // as it otherwise may be ignored
+  write8(BME280_REGISTER_CONTROL, MODE_SLEEP);
+
+  // you must make sure to also set REGISTER_CONTROL after setting the
+  // CONTROLHUMID register, otherwise the values won't be applied (see
+  // DS 5.4.3)
+  write8(BME280_REGISTER_CONTROLHUMID, _humReg.get());
+  write8(BME280_REGISTER_CONFIG, _configReg.get());
+  write8(BME280_REGISTER_CONTROL, _measReg.get());
+}
+
+/*!
+ *   @brief  Writes an 8 bit value over I2C or SPI
+ *   @param reg the register address to write to
+ *   @param value the value to write to the register
+ */
+void Adafruit_BME280::write8(byte reg, byte value) {
+  byte buffer[2];
+  buffer[1] = value;
+  if (i2c_dev) {
+    buffer[0] = reg;
+    i2c_dev->write(buffer, 2);
+  } else {
+    buffer[0] = reg & ~0x80;
+    spi_dev->write(buffer, 2);
+  }
+}
+
+/*!
+ *   @brief  Reads an 8 bit value over I2C or SPI
+ *   @param reg the register address to read from
+ *   @returns the data byte read from the device
+ */
+uint8_t Adafruit_BME280::read8(byte reg) {
+  uint8_t buffer[1];
+  if (i2c_dev) {
+    buffer[0] = uint8_t(reg);
+    i2c_dev->write_then_read(buffer, 1, buffer, 1);
+  } else {
+    buffer[0] = uint8_t(reg | 0x80);
+    spi_dev->write_then_read(buffer, 1, buffer, 1);
+  }
+  return buffer[0];
+}
+
+/*!
+ *   @brief  Reads a 16 bit value over I2C or SPI
+ *   @param reg the register address to read from
+ *   @returns the 16 bit data value read from the device
+ */
+uint16_t Adafruit_BME280::read16(byte reg) {
+  uint8_t buffer[2];
+
+  if (i2c_dev) {
+    buffer[0] = uint8_t(reg);
+    i2c_dev->write_then_read(buffer, 1, buffer, 2);
+  } else {
+    buffer[0] = uint8_t(reg | 0x80);
+    spi_dev->write_then_read(buffer, 1, buffer, 2);
+  }
+  return uint16_t(buffer[0]) << 8 | uint16_t(buffer[1]);
+}
+
+/*!
+ *   @brief  Reads a signed 16 bit little endian value over I2C or SPI
+ *   @param reg the register address to read from
+ *   @returns the 16 bit data value read from the device
+ */
+uint16_t Adafruit_BME280::read16_LE(byte reg) {
+  uint16_t temp = read16(reg);
+  return (temp >> 8) | (temp << 8);
+}
+
+/*!
+ *   @brief  Reads a signed 16 bit value over I2C or SPI
+ *   @param reg the register address to read from
+ *   @returns the 16 bit data value read from the device
+ */
+int16_t Adafruit_BME280::readS16(byte reg) { return (int16_t)read16(reg); }
+
+/*!
+ *   @brief  Reads a signed little endian 16 bit value over I2C or SPI
+ *   @param reg the register address to read from
+ *   @returns the 16 bit data value read from the device
+ */
+int16_t Adafruit_BME280::readS16_LE(byte reg) {
+  return (int16_t)read16_LE(reg);
+}
+
+/*!
+ *   @brief  Reads a 24 bit value over I2C
+ *   @param reg the register address to read from
+ *   @returns the 24 bit data value read from the device
+ */
+uint32_t Adafruit_BME280::read24(byte reg) {
+  uint8_t buffer[3];
+
+  if (i2c_dev) {
+    buffer[0] = uint8_t(reg);
+    i2c_dev->write_then_read(buffer, 1, buffer, 3);
+  } else {
+    buffer[0] = uint8_t(reg | 0x80);
+    spi_dev->write_then_read(buffer, 1, buffer, 3);
+  }
+
+  return uint32_t(buffer[0]) << 16 | uint32_t(buffer[1]) << 8 |
+         uint32_t(buffer[2]);
+}
+
+/*!
+ *  @brief  Take a new measurement (only possible in forced mode)
+    @returns true in case of success else false
+ */
+bool Adafruit_BME280::takeForcedMeasurement(void) {
+  bool return_value = false;
+  // If we are in forced mode, the BME sensor goes back to sleep after each
+  // measurement and we need to set it to forced mode once at this point, so
+  // it will take the next measurement and then return to sleep again.
+  // In normal mode simply does new measurements periodically.
+  if (_measReg.mode == MODE_FORCED) {
+    return_value = true;
+    // set to forced mode, i.e. "take next measurement"
+    write8(BME280_REGISTER_CONTROL, _measReg.get());
+    // Store current time to measure the timeout
+    uint32_t timeout_start = millis();
+    // wait until measurement has been completed, otherwise we would read the
+    // the values from the last measurement or the timeout occurred after 2 sec.
+    while (read8(BME280_REGISTER_STATUS) & 0x08) {
+      // In case of a timeout, stop the while loop
+      if ((millis() - timeout_start) > 2000) {
+        return_value = false;
+        break;
+      }
+      delay(1);
+    }
+  }
+  return return_value;
+}
+
+/*!
+ *   @brief  Reads the factory-set coefficients
+ */
+void Adafruit_BME280::readCoefficients(void) {
+  _bme280_calib.dig_T1 = read16_LE(BME280_REGISTER_DIG_T1);
+  _bme280_calib.dig_T2 = readS16_LE(BME280_REGISTER_DIG_T2);
+  _bme280_calib.dig_T3 = readS16_LE(BME280_REGISTER_DIG_T3);
+
+  _bme280_calib.dig_P1 = read16_LE(BME280_REGISTER_DIG_P1);
+  _bme280_calib.dig_P2 = readS16_LE(BME280_REGISTER_DIG_P2);
+  _bme280_calib.dig_P3 = readS16_LE(BME280_REGISTER_DIG_P3);
+  _bme280_calib.dig_P4 = readS16_LE(BME280_REGISTER_DIG_P4);
+  _bme280_calib.dig_P5 = readS16_LE(BME280_REGISTER_DIG_P5);
+  _bme280_calib.dig_P6 = readS16_LE(BME280_REGISTER_DIG_P6);
+  _bme280_calib.dig_P7 = readS16_LE(BME280_REGISTER_DIG_P7);
+  _bme280_calib.dig_P8 = readS16_LE(BME280_REGISTER_DIG_P8);
+  _bme280_calib.dig_P9 = readS16_LE(BME280_REGISTER_DIG_P9);
+
+  _bme280_calib.dig_H1 = read8(BME280_REGISTER_DIG_H1);
+  _bme280_calib.dig_H2 = readS16_LE(BME280_REGISTER_DIG_H2);
+  _bme280_calib.dig_H3 = read8(BME280_REGISTER_DIG_H3);
+  _bme280_calib.dig_H4 = ((int8_t)read8(BME280_REGISTER_DIG_H4) << 4) |
+                         (read8(BME280_REGISTER_DIG_H4 + 1) & 0xF);
+  _bme280_calib.dig_H5 = ((int8_t)read8(BME280_REGISTER_DIG_H5 + 1) << 4) |
+                         (read8(BME280_REGISTER_DIG_H5) >> 4);
+  _bme280_calib.dig_H6 = (int8_t)read8(BME280_REGISTER_DIG_H6);
+}
+
+/*!
+ *   @brief return true if chip is busy reading cal data
+ *   @returns true if reading calibration, false otherwise
+ */
+bool Adafruit_BME280::isReadingCalibration(void) {
+  uint8_t const rStatus = read8(BME280_REGISTER_STATUS);
+
+  return (rStatus & (1 << 0)) != 0;
+}
+
+/*!
+ *   @brief  Returns the temperature from the sensor
+ *   @returns the temperature read from the device
+ */
+float Adafruit_BME280::readTemperature(void) {
+  int32_t var1, var2;
+
+  int32_t adc_T = read24(BME280_REGISTER_TEMPDATA);
+  if (adc_T == 0x800000) // value in case temp measurement was disabled
+    return NAN;
+  adc_T >>= 4;
+
+  var1 = (int32_t)((adc_T / 8) - ((int32_t)_bme280_calib.dig_T1 * 2));
+  var1 = (var1 * ((int32_t)_bme280_calib.dig_T2)) / 2048;
+  var2 = (int32_t)((adc_T / 16) - ((int32_t)_bme280_calib.dig_T1));
+  var2 = (((var2 * var2) / 4096) * ((int32_t)_bme280_calib.dig_T3)) / 16384;
+
+  t_fine = var1 + var2 + t_fine_adjust;
+
+  int32_t T = (t_fine * 5 + 128) / 256;
+
+  return (float)T / 100;
+}
+
+/*!
+ *   @brief  Returns the pressure from the sensor
+ *   @returns the pressure value (in Pascal) read from the device
+ */
+float Adafruit_BME280::readPressure(void) {
+  int64_t var1, var2, var3, var4;
+
+  readTemperature(); // must be done first to get t_fine
+
+  int32_t adc_P = read24(BME280_REGISTER_PRESSUREDATA);
+  if (adc_P == 0x800000) // value in case pressure measurement was disabled
+    return NAN;
+  adc_P >>= 4;
+
+  var1 = ((int64_t)t_fine) - 128000;
+  var2 = var1 * var1 * (int64_t)_bme280_calib.dig_P6;
+  var2 = var2 + ((var1 * (int64_t)_bme280_calib.dig_P5) * 131072);
+  var2 = var2 + (((int64_t)_bme280_calib.dig_P4) * 34359738368);
+  var1 = ((var1 * var1 * (int64_t)_bme280_calib.dig_P3) / 256) +
+         ((var1 * ((int64_t)_bme280_calib.dig_P2) * 4096));
+  var3 = ((int64_t)1) * 140737488355328;
+  var1 = (var3 + var1) * ((int64_t)_bme280_calib.dig_P1) / 8589934592;
+
+  if (var1 == 0) {
+    return 0; // avoid exception caused by division by zero
+  }
+
+  var4 = 1048576 - adc_P;
+  var4 = (((var4 * 2147483648) - var2) * 3125) / var1;
+  var1 = (((int64_t)_bme280_calib.dig_P9) * (var4 / 8192) * (var4 / 8192)) /
+         33554432;
+  var2 = (((int64_t)_bme280_calib.dig_P8) * var4) / 524288;
+  var4 = ((var4 + var1 + var2) / 256) + (((int64_t)_bme280_calib.dig_P7) * 16);
+
+  float P = var4 / 256.0;
+
+  return P;
+}
+
+/*!
+ *  @brief  Returns the humidity from the sensor
+ *  @returns the humidity value read from the device
+ */
+float Adafruit_BME280::readHumidity(void) {
+  int32_t var1, var2, var3, var4, var5;
+
+  readTemperature(); // must be done first to get t_fine
+
+  int32_t adc_H = read16(BME280_REGISTER_HUMIDDATA);
+  if (adc_H == 0x8000) // value in case humidity measurement was disabled
+    return NAN;
+
+  var1 = t_fine - ((int32_t)76800);
+  var2 = (int32_t)(adc_H * 16384);
+  var3 = (int32_t)(((int32_t)_bme280_calib.dig_H4) * 1048576);
+  var4 = ((int32_t)_bme280_calib.dig_H5) * var1;
+  var5 = (((var2 - var3) - var4) + (int32_t)16384) / 32768;
+  var2 = (var1 * ((int32_t)_bme280_calib.dig_H6)) / 1024;
+  var3 = (var1 * ((int32_t)_bme280_calib.dig_H3)) / 2048;
+  var4 = ((var2 * (var3 + (int32_t)32768)) / 1024) + (int32_t)2097152;
+  var2 = ((var4 * ((int32_t)_bme280_calib.dig_H2)) + 8192) / 16384;
+  var3 = var5 * var2;
+  var4 = ((var3 / 32768) * (var3 / 32768)) / 128;
+  var5 = var3 - ((var4 * ((int32_t)_bme280_calib.dig_H1)) / 16);
+  var5 = (var5 < 0 ? 0 : var5);
+  var5 = (var5 > 419430400 ? 419430400 : var5);
+  uint32_t H = (uint32_t)(var5 / 4096);
+
+  return (float)H / 1024.0;
+}
+
+/*!
+ *   Calculates the altitude (in meters) from the specified atmospheric
+ *   pressure (in hPa), and sea-level pressure (in hPa).
+ *   @param  seaLevel      Sea-level pressure in hPa
+ *   @returns the altitude value read from the device
+ */
+float Adafruit_BME280::readAltitude(float seaLevel) {
+  // Equation taken from BMP180 datasheet (page 16):
+  //  http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
+
+  // Note that using the equation from wikipedia can give bad results
+  // at high altitude. See this thread for more information:
+  //  http://forums.adafruit.com/viewtopic.php?f=22&t=58064
+
+  float atmospheric = readPressure() / 100.0F;
+  return 44330.0 * (1.0 - pow(atmospheric / seaLevel, 0.1903));
+}
+
+/*!
+ *   Calculates the pressure at sea level (in hPa) from the specified
+ * altitude (in meters), and atmospheric pressure (in hPa).
+ *   @param  altitude      Altitude in meters
+ *   @param  atmospheric   Atmospheric pressure in hPa
+ *   @returns the pressure at sea level (in hPa) from the specified altitude
+ */
+float Adafruit_BME280::seaLevelForAltitude(float altitude, float atmospheric) {
+  // Equation taken from BMP180 datasheet (page 17):
+  //  http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
+
+  // Note that using the equation from wikipedia can give bad results
+  // at high altitude. See this thread for more information:
+  //  http://forums.adafruit.com/viewtopic.php?f=22&t=58064
+
+  return atmospheric / pow(1.0 - (altitude / 44330.0), 5.255);
+}
+
+/*!
+ *   Returns Sensor ID found by init() for diagnostics
+ *   @returns Sensor ID 0x60 for BME280, 0x56, 0x57, 0x58 BMP280
+ */
+uint32_t Adafruit_BME280::sensorID(void) { return _sensorID; }
+
+/*!
+ *   Returns the current temperature compensation value in degrees Celsius
+ *   @returns the current temperature compensation value in degrees Celsius
+ */
+float Adafruit_BME280::getTemperatureCompensation(void) {
+  return float((t_fine_adjust * 5) >> 8) / 100.0;
+};
+
+/*!
+ *  Sets a value to be added to each temperature reading. This adjusted
+ *  temperature is used in pressure and humidity readings.
+ *  @param  adjustment  Value to be added to each temperature reading in Celsius
+ */
+void Adafruit_BME280::setTemperatureCompensation(float adjustment) {
+  // convert the value in C into and adjustment to t_fine
+  t_fine_adjust = ((int32_t(adjustment * 100) << 8)) / 5;
+};
+
+/*!
+    @brief  Gets an Adafruit Unified Sensor object for the temp sensor component
+    @return Adafruit_Sensor pointer to temperature sensor
+ */
+Adafruit_Sensor *Adafruit_BME280::getTemperatureSensor(void) {
+  if (!temp_sensor) {
+    temp_sensor = new Adafruit_BME280_Temp(this);
+  }
+
+  return temp_sensor;
+}
+
+/*!
+    @brief  Gets an Adafruit Unified Sensor object for the pressure sensor
+   component
+    @return Adafruit_Sensor pointer to pressure sensor
+ */
+Adafruit_Sensor *Adafruit_BME280::getPressureSensor(void) {
+  if (!pressure_sensor) {
+    pressure_sensor = new Adafruit_BME280_Pressure(this);
+  }
+  return pressure_sensor;
+}
+
+/*!
+    @brief  Gets an Adafruit Unified Sensor object for the humidity sensor
+   component
+    @return Adafruit_Sensor pointer to humidity sensor
+ */
+Adafruit_Sensor *Adafruit_BME280::getHumiditySensor(void) {
+  if (!humidity_sensor) {
+    humidity_sensor = new Adafruit_BME280_Humidity(this);
+  }
+  return humidity_sensor;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the sensor_t data for the BME280's temperature sensor
+*/
+/**************************************************************************/
+void Adafruit_BME280_Temp::getSensor(sensor_t *sensor) {
+  /* Clear the sensor_t object */
+  memset(sensor, 0, sizeof(sensor_t));
+
+  /* Insert the sensor name in the fixed length char array */
+  strncpy(sensor->name, "BME280", sizeof(sensor->name) - 1);
+  sensor->name[sizeof(sensor->name) - 1] = 0;
+  sensor->version = 1;
+  sensor->sensor_id = _sensorID;
+  sensor->type = SENSOR_TYPE_AMBIENT_TEMPERATURE;
+  sensor->min_delay = 0;
+  sensor->min_value = -40.0; /* Temperature range -40 ~ +85 C  */
+  sensor->max_value = +85.0;
+  sensor->resolution = 0.01; /*  0.01 C */
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the temperature as a standard sensor event
+    @param  event Sensor event object that will be populated
+    @returns True
+*/
+/**************************************************************************/
+bool Adafruit_BME280_Temp::getEvent(sensors_event_t *event) {
+  /* Clear the event */
+  memset(event, 0, sizeof(sensors_event_t));
+
+  event->version = sizeof(sensors_event_t);
+  event->sensor_id = _sensorID;
+  event->type = SENSOR_TYPE_AMBIENT_TEMPERATURE;
+  event->timestamp = millis();
+  event->temperature = _theBME280->readTemperature();
+  return true;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the sensor_t data for the BME280's pressure sensor
+*/
+/**************************************************************************/
+void Adafruit_BME280_Pressure::getSensor(sensor_t *sensor) {
+  /* Clear the sensor_t object */
+  memset(sensor, 0, sizeof(sensor_t));
+
+  /* Insert the sensor name in the fixed length char array */
+  strncpy(sensor->name, "BME280", sizeof(sensor->name) - 1);
+  sensor->name[sizeof(sensor->name) - 1] = 0;
+  sensor->version = 1;
+  sensor->sensor_id = _sensorID;
+  sensor->type = SENSOR_TYPE_PRESSURE;
+  sensor->min_delay = 0;
+  sensor->min_value = 300.0; /* 300 ~ 1100 hPa  */
+  sensor->max_value = 1100.0;
+  sensor->resolution = 0.012; /* 0.12 hPa relative */
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the pressure as a standard sensor event
+    @param  event Sensor event object that will be populated
+    @returns True
+*/
+/**************************************************************************/
+bool Adafruit_BME280_Pressure::getEvent(sensors_event_t *event) {
+  /* Clear the event */
+  memset(event, 0, sizeof(sensors_event_t));
+
+  event->version = sizeof(sensors_event_t);
+  event->sensor_id = _sensorID;
+  event->type = SENSOR_TYPE_PRESSURE;
+  event->timestamp = millis();
+  event->pressure = _theBME280->readPressure() / 100; // convert Pa to hPa
+  return true;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the sensor_t data for the BME280's humidity sensor
+*/
+/**************************************************************************/
+void Adafruit_BME280_Humidity::getSensor(sensor_t *sensor) {
+  /* Clear the sensor_t object */
+  memset(sensor, 0, sizeof(sensor_t));
+
+  /* Insert the sensor name in the fixed length char array */
+  strncpy(sensor->name, "BME280", sizeof(sensor->name) - 1);
+  sensor->name[sizeof(sensor->name) - 1] = 0;
+  sensor->version = 1;
+  sensor->sensor_id = _sensorID;
+  sensor->type = SENSOR_TYPE_RELATIVE_HUMIDITY;
+  sensor->min_delay = 0;
+  sensor->min_value = 0;
+  sensor->max_value = 100; /* 0 - 100 %  */
+  sensor->resolution = 3;  /* 3% accuracy */
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the humidity as a standard sensor event
+    @param  event Sensor event object that will be populated
+    @returns True
+*/
+/**************************************************************************/
+bool Adafruit_BME280_Humidity::getEvent(sensors_event_t *event) {
+  /* Clear the event */
+  memset(event, 0, sizeof(sensors_event_t));
+
+  event->version = sizeof(sensors_event_t);
+  event->sensor_id = _sensorID;
+  event->type = SENSOR_TYPE_RELATIVE_HUMIDITY;
+  event->timestamp = millis();
+  event->relative_humidity = _theBME280->readHumidity();
+  return true;
+}

lib/Adafruit_BME280_Library/Adafruit_BME280.h

@@ -0,0 +1,372 @@
+/*!
+ * @file Adafruit_BME280.h
+ *
+ * Designed specifically to work with the Adafruit BME280 Breakout
+ * ----> http://www.adafruit.com/products/2650
+ *
+ * These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+ * to interface.
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Kevin "KTOWN" Townsend for Adafruit Industries.
+ *
+ * BSD license, all text here must be included in any redistribution.
+ * See the LICENSE file for details.
+ *
+ */
+
+#ifndef __BME280_H__
+#define __BME280_H__
+
+#include "Arduino.h"
+
+#include <Adafruit_I2CDevice.h>
+#include <Adafruit_SPIDevice.h>
+#include <Adafruit_Sensor.h>
+
+/*!
+ *  @brief  default I2C address
+ */
+#define BME280_ADDRESS (0x77)           // Primary I2C Address
+                                        /*!
+                                         *  @brief  alternate I2C address
+                                         */
+#define BME280_ADDRESS_ALTERNATE (0x76) // Alternate Address
+
+/*!
+ *  @brief Register addresses
+ */
+enum {
+  BME280_REGISTER_DIG_T1 = 0x88,
+  BME280_REGISTER_DIG_T2 = 0x8A,
+  BME280_REGISTER_DIG_T3 = 0x8C,
+
+  BME280_REGISTER_DIG_P1 = 0x8E,
+  BME280_REGISTER_DIG_P2 = 0x90,
+  BME280_REGISTER_DIG_P3 = 0x92,
+  BME280_REGISTER_DIG_P4 = 0x94,
+  BME280_REGISTER_DIG_P5 = 0x96,
+  BME280_REGISTER_DIG_P6 = 0x98,
+  BME280_REGISTER_DIG_P7 = 0x9A,
+  BME280_REGISTER_DIG_P8 = 0x9C,
+  BME280_REGISTER_DIG_P9 = 0x9E,
+
+  BME280_REGISTER_DIG_H1 = 0xA1,
+  BME280_REGISTER_DIG_H2 = 0xE1,
+  BME280_REGISTER_DIG_H3 = 0xE3,
+  BME280_REGISTER_DIG_H4 = 0xE4,
+  BME280_REGISTER_DIG_H5 = 0xE5,
+  BME280_REGISTER_DIG_H6 = 0xE7,
+
+  BME280_REGISTER_CHIPID = 0xD0,
+  BME280_REGISTER_VERSION = 0xD1,
+  BME280_REGISTER_SOFTRESET = 0xE0,
+
+  BME280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0
+
+  BME280_REGISTER_CONTROLHUMID = 0xF2,
+  BME280_REGISTER_STATUS = 0XF3,
+  BME280_REGISTER_CONTROL = 0xF4,
+  BME280_REGISTER_CONFIG = 0xF5,
+  BME280_REGISTER_PRESSUREDATA = 0xF7,
+  BME280_REGISTER_TEMPDATA = 0xFA,
+  BME280_REGISTER_HUMIDDATA = 0xFD
+};
+
+/**************************************************************************/
+/*!
+    @brief  calibration data
+*/
+/**************************************************************************/
+typedef struct {
+  uint16_t dig_T1; ///< temperature compensation value
+  int16_t dig_T2;  ///< temperature compensation value
+  int16_t dig_T3;  ///< temperature compensation value
+
+  uint16_t dig_P1; ///< pressure compensation value
+  int16_t dig_P2;  ///< pressure compensation value
+  int16_t dig_P3;  ///< pressure compensation value
+  int16_t dig_P4;  ///< pressure compensation value
+  int16_t dig_P5;  ///< pressure compensation value
+  int16_t dig_P6;  ///< pressure compensation value
+  int16_t dig_P7;  ///< pressure compensation value
+  int16_t dig_P8;  ///< pressure compensation value
+  int16_t dig_P9;  ///< pressure compensation value
+
+  uint8_t dig_H1; ///< humidity compensation value
+  int16_t dig_H2; ///< humidity compensation value
+  uint8_t dig_H3; ///< humidity compensation value
+  int16_t dig_H4; ///< humidity compensation value
+  int16_t dig_H5; ///< humidity compensation value
+  int8_t dig_H6;  ///< humidity compensation value
+} bme280_calib_data;
+/*=========================================================================*/
+
+class Adafruit_BME280;
+
+/** Adafruit Unified Sensor interface for temperature component of BME280 */
+class Adafruit_BME280_Temp : public Adafruit_Sensor {
+public:
+  /** @brief Create an Adafruit_Sensor compatible object for the temp sensor
+      @param parent A pointer to the BME280 class */
+  Adafruit_BME280_Temp(Adafruit_BME280 *parent) { _theBME280 = parent; }
+  bool getEvent(sensors_event_t *);
+  void getSensor(sensor_t *);
+
+private:
+  int _sensorID = 280;
+  Adafruit_BME280 *_theBME280 = NULL;
+};
+
+/** Adafruit Unified Sensor interface for pressure component of BME280 */
+class Adafruit_BME280_Pressure : public Adafruit_Sensor {
+public:
+  /** @brief Create an Adafruit_Sensor compatible object for the pressure sensor
+      @param parent A pointer to the BME280 class */
+  Adafruit_BME280_Pressure(Adafruit_BME280 *parent) { _theBME280 = parent; }
+  bool getEvent(sensors_event_t *);
+  void getSensor(sensor_t *);
+
+private:
+  int _sensorID = 280;
+  Adafruit_BME280 *_theBME280 = NULL;
+};
+
+/** Adafruit Unified Sensor interface for humidity component of BME280 */
+class Adafruit_BME280_Humidity : public Adafruit_Sensor {
+public:
+  /** @brief Create an Adafruit_Sensor compatible object for the humidity sensor
+      @param parent A pointer to the BME280 class */
+  Adafruit_BME280_Humidity(Adafruit_BME280 *parent) { _theBME280 = parent; }
+  bool getEvent(sensors_event_t *);
+  void getSensor(sensor_t *);
+
+private:
+  int _sensorID = 280;
+  Adafruit_BME280 *_theBME280 = NULL;
+};
+
+/**************************************************************************/
+/*!
+    @brief  Class that stores state and functions for interacting with BME280 IC
+*/
+/**************************************************************************/
+class Adafruit_BME280 {
+public:
+  /**************************************************************************/
+  /*!
+      @brief  sampling rates
+  */
+  /**************************************************************************/
+  enum sensor_sampling {
+    SAMPLING_NONE = 0b000,
+    SAMPLING_X1 = 0b001,
+    SAMPLING_X2 = 0b010,
+    SAMPLING_X4 = 0b011,
+    SAMPLING_X8 = 0b100,
+    SAMPLING_X16 = 0b101
+  };
+
+  /**************************************************************************/
+  /*!
+      @brief  power modes
+  */
+  /**************************************************************************/
+  enum sensor_mode {
+    MODE_SLEEP = 0b00,
+    MODE_FORCED = 0b01,
+    MODE_NORMAL = 0b11
+  };
+
+  /**************************************************************************/
+  /*!
+      @brief  filter values
+  */
+  /**************************************************************************/
+  enum sensor_filter {
+    FILTER_OFF = 0b000,
+    FILTER_X2 = 0b001,
+    FILTER_X4 = 0b010,
+    FILTER_X8 = 0b011,
+    FILTER_X16 = 0b100
+  };
+
+  /**************************************************************************/
+  /*!
+      @brief  standby duration in ms
+  */
+  /**************************************************************************/
+  enum standby_duration {
+    STANDBY_MS_0_5 = 0b000,
+    STANDBY_MS_10 = 0b110,
+    STANDBY_MS_20 = 0b111,
+    STANDBY_MS_62_5 = 0b001,
+    STANDBY_MS_125 = 0b010,
+    STANDBY_MS_250 = 0b011,
+    STANDBY_MS_500 = 0b100,
+    STANDBY_MS_1000 = 0b101
+  };
+
+  // constructors
+  Adafruit_BME280();
+  Adafruit_BME280(int8_t cspin, SPIClass *theSPI = &SPI);
+  Adafruit_BME280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);
+  ~Adafruit_BME280(void);
+  bool begin(uint8_t addr = BME280_ADDRESS, TwoWire *theWire = &Wire);
+  bool init();
+
+  void setSampling(sensor_mode mode = MODE_NORMAL,
+                   sensor_sampling tempSampling = SAMPLING_X16,
+                   sensor_sampling pressSampling = SAMPLING_X16,
+                   sensor_sampling humSampling = SAMPLING_X16,
+                   sensor_filter filter = FILTER_OFF,
+                   standby_duration duration = STANDBY_MS_0_5);
+
+  bool takeForcedMeasurement(void);
+  float readTemperature(void);
+  float readPressure(void);
+  float readHumidity(void);
+
+  float readAltitude(float seaLevel);
+  float seaLevelForAltitude(float altitude, float pressure);
+  uint32_t sensorID(void);
+
+  float getTemperatureCompensation(void);
+  void setTemperatureCompensation(float);
+
+  Adafruit_Sensor *getTemperatureSensor(void);
+  Adafruit_Sensor *getPressureSensor(void);
+  Adafruit_Sensor *getHumiditySensor(void);
+
+protected:
+  Adafruit_I2CDevice *i2c_dev = NULL; ///< Pointer to I2C bus interface
+  Adafruit_SPIDevice *spi_dev = NULL; ///< Pointer to SPI bus interface
+
+  Adafruit_BME280_Temp *temp_sensor = NULL;
+  //!< Adafruit_Sensor compat temperature sensor component
+
+  Adafruit_BME280_Pressure *pressure_sensor = NULL;
+  //!< Adafruit_Sensor compat pressure sensor component
+
+  Adafruit_BME280_Humidity *humidity_sensor = NULL;
+  //!< Adafruit_Sensor compat humidity sensor component
+
+  void readCoefficients(void);
+  bool isReadingCalibration(void);
+
+  void write8(byte reg, byte value);
+  uint8_t read8(byte reg);
+  uint16_t read16(byte reg);
+  uint32_t read24(byte reg);
+  int16_t readS16(byte reg);
+  uint16_t read16_LE(byte reg); // little endian
+  int16_t readS16_LE(byte reg); // little endian
+
+  uint8_t _i2caddr;  //!< I2C addr for the TwoWire interface
+  int32_t _sensorID; //!< ID of the BME Sensor
+  int32_t t_fine; //!< temperature with high resolution, stored as an attribute
+                  //!< as this is used for temperature compensation reading
+                  //!< humidity and pressure
+
+  int32_t t_fine_adjust = 0; //!< add to compensate temp readings and in turn
+                             //!< to pressure and humidity readings
+
+  bme280_calib_data _bme280_calib; //!< here calibration data is stored
+
+  /**************************************************************************/
+  /*!
+      @brief  config register
+  */
+  /**************************************************************************/
+  struct config {
+    // inactive duration (standby time) in normal mode
+    // 000 = 0.5 ms
+    // 001 = 62.5 ms
+    // 010 = 125 ms
+    // 011 = 250 ms
+    // 100 = 500 ms
+    // 101 = 1000 ms
+    // 110 = 10 ms
+    // 111 = 20 ms
+    unsigned int t_sb : 3; ///< inactive duration (standby time) in normal mode
+
+    // filter settings
+    // 000 = filter off
+    // 001 = 2x filter
+    // 010 = 4x filter
+    // 011 = 8x filter
+    // 100 and above = 16x filter
+    unsigned int filter : 3; ///< filter settings
+
+    // unused - don't set
+    unsigned int none : 1;     ///< unused - don't set
+    unsigned int spi3w_en : 1; ///< unused - don't set
+
+    /// @return combined config register
+    unsigned int get() { return (t_sb << 5) | (filter << 2) | spi3w_en; }
+  };
+  config _configReg; //!< config register object
+
+  /**************************************************************************/
+  /*!
+      @brief  ctrl_meas register
+  */
+  /**************************************************************************/
+  struct ctrl_meas {
+    // temperature oversampling
+    // 000 = skipped
+    // 001 = x1
+    // 010 = x2
+    // 011 = x4
+    // 100 = x8
+    // 101 and above = x16
+    unsigned int osrs_t : 3; ///< temperature oversampling
+
+    // pressure oversampling
+    // 000 = skipped
+    // 001 = x1
+    // 010 = x2
+    // 011 = x4
+    // 100 = x8
+    // 101 and above = x16
+    unsigned int osrs_p : 3; ///< pressure oversampling
+
+    // device mode
+    // 00       = sleep
+    // 01 or 10 = forced
+    // 11       = normal
+    unsigned int mode : 2; ///< device mode
+
+    /// @return combined ctrl register
+    unsigned int get() { return (osrs_t << 5) | (osrs_p << 2) | mode; }
+  };
+  ctrl_meas _measReg; //!< measurement register object
+
+  /**************************************************************************/
+  /*!
+      @brief  ctrl_hum register
+  */
+  /**************************************************************************/
+  struct ctrl_hum {
+    /// unused - don't set
+    unsigned int none : 5;
+
+    // pressure oversampling
+    // 000 = skipped
+    // 001 = x1
+    // 010 = x2
+    // 011 = x4
+    // 100 = x8
+    // 101 and above = x16
+    unsigned int osrs_h : 3; ///< pressure oversampling
+
+    /// @return combined ctrl hum register
+    unsigned int get() { return (osrs_h); }
+  };
+  ctrl_hum _humReg; //!< hum register object
+};
+
+#endif

lib/Adafruit_BME280_Library/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2015, Limor Fried & Kevin Townsend for Adafruit Industries 
+All rights reserved. 
+
+Redistribution and use in source and binary forms, with or without 
+modification, are permitted provided that the following conditions are met: 
+
+ * Redistributions of source code must retain the above copyright notice, 
+   this list of conditions and the following disclaimer. 
+ * Redistributions in binary form must reproduce the above copyright 
+   notice, this list of conditions and the following disclaimer in the 
+   documentation and/or other materials provided with the distribution. 
+ * Neither the name of Adafruit Industries nor the names of its 
+   contributors may be used to endorse or promote products derived from 
+   this software without specific prior written permission. 
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+POSSIBILITY OF SUCH DAMAGE.
+

lib/Adafruit_BME280_Library/README.md

@@ -0,0 +1,54 @@
+# Adafruit BME280 Library [![Build Status](https://github.com/adafruit/Adafruit_BME280_Library/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_BME280_Library/actions)[![Documentation](https://github.com/adafruit/ci-arduino/blob/master/assets/doxygen_badge.svg)](http://adafruit.github.io/Adafruit_BME280_Library/html/index.html)
+
+
+<a href="http://www.adafruit.com/products/2652"><img src="./assets/board.jpg" width="500"/></a>
+
+This is a library for the Adafruit BME280 Humidity, Barometric Pressure + Temp sensor
+
+Designed specifically to work with the Adafruit BME280 Breakout 
+ * http://www.adafruit.com/products/2652
+
+Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
+
+# Installation
+To install, use the Arduino Library Manager and search for "Adafruit BME280" and install the library.
+
+## Dependencies
+ * [Adafruit Unified Sensor Driver](https://github.com/adafruit/Adafruit_Sensor)
+
+# Contributing
+
+Contributions are welcome! Please read our [Code of Conduct](https://github.com/adafruit/Adafruit_PM25AQI/blob/master/CODE_OF_CONDUCT.md>)
+before contributing to help this project stay welcoming.
+
+## Documentation and doxygen
+Documentation is produced by doxygen. Contributions should include documentation for any new code added.
+
+Some examples of how to use doxygen can be found in these guide pages:
+
+https://learn.adafruit.com/the-well-automated-arduino-library/doxygen
+
+https://learn.adafruit.com/the-well-automated-arduino-library/doxygen-tips
+
+## Formatting and clang-format
+This library uses [`clang-format`](https://releases.llvm.org/download.html) to standardize the formatting of `.cpp` and `.h` files.
+Contributions should be formatted using `clang-format`:
+
+The `-i` flag will make the changes to the file.
+```bash
+clang-format -i *.cpp *.h
+```
+If you prefer to make the changes yourself, running `clang-format` without the `-i` flag will print out a formatted version of the file. You can save this to a file and diff it against the original to see the changes.
+
+Note that the formatting output by `clang-format` is what the automated formatting checker will expect. Any diffs from this formatting will result in a failed build until they are addressed. Using the `-i` flag is highly recommended.
+
+### clang-format resources
+  * [Binary builds and source available on the LLVM downloads page](https://releases.llvm.org/download.html)
+  * [Documentation and IDE integration](https://clang.llvm.org/docs/ClangFormat.html)
+
+## About this Driver
+Written by Ladyada for Adafruit Industries.
+
+BSD license, check license.txt for more information
+
+All text above must be included in any redistribution

lib/Adafruit_BME280_Library/examples/advancedsettings/advancedsettings.ino

@@ -0,0 +1,159 @@
+/***************************************************************************
+  This is a library for the BME280 humidity, temperature & pressure sensor
+
+  Designed specifically to work with the Adafruit BME280 Breakout
+  ----> http://www.adafruit.com/products/2650
+
+  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+  to interface. The device's I2C address is either 0x76 or 0x77.
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit andopen-source hardware by purchasing products
+  from Adafruit!
+
+  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+  See the LICENSE file for details.
+ ***************************************************************************/
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_BME280.h>
+
+#define BME_SCK 13
+#define BME_MISO 12
+#define BME_MOSI 11
+#define BME_CS 10
+
+#define SEALEVELPRESSURE_HPA (1013.25)
+
+Adafruit_BME280 bme; // I2C
+//Adafruit_BME280 bme(BME_CS); // hardware SPI
+//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
+
+unsigned long delayTime;
+
+void setup() {
+    Serial.begin(9600);
+    Serial.println(F("BME280 test"));
+
+    if (! bme.begin(0x77, &Wire)) {
+        Serial.println("Could not find a valid BME280 sensor, check wiring!");
+        while (1);
+    }
+
+    Serial.println("-- Default Test --");
+    Serial.println("normal mode, 16x oversampling for all, filter off,");
+    Serial.println("0.5ms standby period");
+    delayTime = 5000;
+    
+    
+    // For more details on the following scenarious, see chapter
+    // 3.5 "Recommended modes of operation" in the datasheet
+    
+/*
+    // weather monitoring
+    Serial.println("-- Weather Station Scenario --");
+    Serial.println("forced mode, 1x temperature / 1x humidity / 1x pressure oversampling,");
+    Serial.println("filter off");
+    bme.setSampling(Adafruit_BME280::MODE_FORCED,
+                    Adafruit_BME280::SAMPLING_X1, // temperature
+                    Adafruit_BME280::SAMPLING_X1, // pressure
+                    Adafruit_BME280::SAMPLING_X1, // humidity
+                    Adafruit_BME280::FILTER_OFF   );
+                      
+    // suggested rate is 1/60Hz (1m)
+    delayTime = 60000; // in milliseconds
+*/
+
+/*    
+    // humidity sensing
+    Serial.println("-- Humidity Sensing Scenario --");
+    Serial.println("forced mode, 1x temperature / 1x humidity / 0x pressure oversampling");
+    Serial.println("= pressure off, filter off");
+    bme.setSampling(Adafruit_BME280::MODE_FORCED,
+                    Adafruit_BME280::SAMPLING_X1,   // temperature
+                    Adafruit_BME280::SAMPLING_NONE, // pressure
+                    Adafruit_BME280::SAMPLING_X1,   // humidity
+                    Adafruit_BME280::FILTER_OFF );
+                      
+    // suggested rate is 1Hz (1s)
+    delayTime = 1000;  // in milliseconds
+*/
+
+/*    
+    // indoor navigation
+    Serial.println("-- Indoor Navigation Scenario --");
+    Serial.println("normal mode, 16x pressure / 2x temperature / 1x humidity oversampling,");
+    Serial.println("0.5ms standby period, filter 16x");
+    bme.setSampling(Adafruit_BME280::MODE_NORMAL,
+                    Adafruit_BME280::SAMPLING_X2,  // temperature
+                    Adafruit_BME280::SAMPLING_X16, // pressure
+                    Adafruit_BME280::SAMPLING_X1,  // humidity
+                    Adafruit_BME280::FILTER_X16,
+                    Adafruit_BME280::STANDBY_MS_0_5 );
+    
+    // suggested rate is 25Hz
+    // 1 + (2 * T_ovs) + (2 * P_ovs + 0.5) + (2 * H_ovs + 0.5)
+    // T_ovs = 2
+    // P_ovs = 16
+    // H_ovs = 1
+    // = 40ms (25Hz)
+    // with standby time that should really be 24.16913... Hz
+    delayTime = 41;
+    */
+    
+    /*
+    // gaming
+    Serial.println("-- Gaming Scenario --");
+    Serial.println("normal mode, 4x pressure / 1x temperature / 0x humidity oversampling,");
+    Serial.println("= humidity off, 0.5ms standby period, filter 16x");
+    bme.setSampling(Adafruit_BME280::MODE_NORMAL,
+                    Adafruit_BME280::SAMPLING_X1,   // temperature
+                    Adafruit_BME280::SAMPLING_X4,   // pressure
+                    Adafruit_BME280::SAMPLING_NONE, // humidity
+                    Adafruit_BME280::FILTER_X16,
+                    Adafruit_BME280::STANDBY_MS_0_5 );
+                      
+    // Suggested rate is 83Hz
+    // 1 + (2 * T_ovs) + (2 * P_ovs + 0.5)
+    // T_ovs = 1
+    // P_ovs = 4
+    // = 11.5ms + 0.5ms standby
+    delayTime = 12;
+*/
+
+    Serial.println();
+}
+
+
+void loop() {
+    // Only needed in forced mode! In normal mode, you can remove the next line.
+    bme.takeForcedMeasurement(); // has no effect in normal mode
+    
+    printValues();
+    delay(delayTime);
+}
+
+
+void printValues() {
+    Serial.print("Temperature = ");
+    Serial.print(bme.readTemperature());
+    Serial.println(" *C");
+
+    Serial.print("Pressure = ");
+
+    Serial.print(bme.readPressure() / 100.0F);
+    Serial.println(" hPa");
+
+    Serial.print("Approx. Altitude = ");
+    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
+    Serial.println(" m");
+
+    Serial.print("Humidity = ");
+    Serial.print(bme.readHumidity());
+    Serial.println(" %");
+
+    Serial.println();
+}

lib/Adafruit_BME280_Library/examples/bme280_unified/bme280_unified.ino

@@ -0,0 +1,62 @@
+/***************************************************************************
+  This is a library for the BME280 humidity, temperature & pressure sensor
+  This example shows how to take Sensor Events instead of direct readings
+  
+  Designed specifically to work with the Adafruit BME280 Breakout
+  ----> http://www.adafruit.com/products/2652
+
+  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+  to interface.
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing products
+  from Adafruit!
+
+  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ***************************************************************************/
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_BME280.h>
+
+Adafruit_BME280 bme; // use I2C interface
+Adafruit_Sensor *bme_temp = bme.getTemperatureSensor();
+Adafruit_Sensor *bme_pressure = bme.getPressureSensor();
+Adafruit_Sensor *bme_humidity = bme.getHumiditySensor();
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println(F("BME280 Sensor event test"));
+
+  if (!bme.begin()) {
+    Serial.println(F("Could not find a valid BME280 sensor, check wiring!"));
+    while (1) delay(10);
+  }
+  
+  bme_temp->printSensorDetails();
+  bme_pressure->printSensorDetails();
+  bme_humidity->printSensorDetails();
+}
+
+void loop() {
+  sensors_event_t temp_event, pressure_event, humidity_event;
+  bme_temp->getEvent(&temp_event);
+  bme_pressure->getEvent(&pressure_event);
+  bme_humidity->getEvent(&humidity_event);
+  
+  Serial.print(F("Temperature = "));
+  Serial.print(temp_event.temperature);
+  Serial.println(" *C");
+
+  Serial.print(F("Humidity = "));
+  Serial.print(humidity_event.relative_humidity);
+  Serial.println(" %");
+
+  Serial.print(F("Pressure = "));
+  Serial.print(pressure_event.pressure);
+  Serial.println(" hPa");
+
+  Serial.println();
+  delay(1000);
+}

lib/Adafruit_BME280_Library/examples/bme280test/bme280test.ino

@@ -0,0 +1,90 @@
+/***************************************************************************
+  This is a library for the BME280 humidity, temperature & pressure sensor
+
+  Designed specifically to work with the Adafruit BME280 Breakout
+  ----> http://www.adafruit.com/products/2650
+
+  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+  to interface. The device's I2C address is either 0x76 or 0x77.
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit andopen-source hardware by purchasing products
+  from Adafruit!
+
+  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+  See the LICENSE file for details.
+ ***************************************************************************/
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_BME280.h>
+
+#define BME_SCK 13
+#define BME_MISO 12
+#define BME_MOSI 11
+#define BME_CS 10
+
+#define SEALEVELPRESSURE_HPA (1013.25)
+
+Adafruit_BME280 bme; // I2C
+//Adafruit_BME280 bme(BME_CS); // hardware SPI
+//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
+
+unsigned long delayTime;
+
+void setup() {
+    Serial.begin(9600);
+    while(!Serial);    // time to get serial running
+    Serial.println(F("BME280 test"));
+
+    unsigned status;
+    
+    // default settings
+    status = bme.begin();  
+    // You can also pass in a Wire library object like &Wire2
+    // status = bme.begin(0x76, &Wire2)
+    if (!status) {
+        Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
+        Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
+        Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
+        Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
+        Serial.print("        ID of 0x60 represents a BME 280.\n");
+        Serial.print("        ID of 0x61 represents a BME 680.\n");
+        while (1) delay(10);
+    }
+    
+    Serial.println("-- Default Test --");
+    delayTime = 1000;
+
+    Serial.println();
+}
+
+
+void loop() { 
+    printValues();
+    delay(delayTime);
+}
+
+
+void printValues() {
+    Serial.print("Temperature = ");
+    Serial.print(bme.readTemperature());
+    Serial.println(" °C");
+
+    Serial.print("Pressure = ");
+
+    Serial.print(bme.readPressure() / 100.0F);
+    Serial.println(" hPa");
+
+    Serial.print("Approx. Altitude = ");
+    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
+    Serial.println(" m");
+
+    Serial.print("Humidity = ");
+    Serial.print(bme.readHumidity());
+    Serial.println(" %");
+
+    Serial.println();
+}

lib/Adafruit_BME280_Library/library.properties

@@ -0,0 +1,10 @@
+name=Adafruit BME280 Library
+version=2.2.2
+author=Adafruit
+maintainer=Adafruit <info@adafruit.com>
+sentence=Arduino library for BME280 sensors.
+paragraph=Arduino library for BME280 humidity and pressure sensors.
+category=Sensors
+url=https://github.com/adafruit/Adafruit_BME280_Library
+architectures=*
+depends=Adafruit Unified Sensor, Adafruit BusIO

lib/Adafruit_BusIO/.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,46 @@
+Thank you for opening an issue on an Adafruit Arduino library repository.  To
+improve the speed of resolution please review the following guidelines and
+common troubleshooting steps below before creating the issue:
+
+- **Do not use GitHub issues for troubleshooting projects and issues.**  Instead use
+  the forums at http://forums.adafruit.com to ask questions and troubleshoot why
+  something isn't working as expected.  In many cases the problem is a common issue
+  that you will more quickly receive help from the forum community.  GitHub issues
+  are meant for known defects in the code.  If you don't know if there is a defect
+  in the code then start with troubleshooting on the forum first.
+
+- **If following a tutorial or guide be sure you didn't miss a step.** Carefully
+  check all of the steps and commands to run have been followed.  Consult the
+  forum if you're unsure or have questions about steps in a guide/tutorial.
+
+- **For Arduino projects check these very common issues to ensure they don't apply**:
+
+  - For uploading sketches or communicating with the board make sure you're using
+    a **USB data cable** and **not** a **USB charge-only cable**.  It is sometimes
+    very hard to tell the difference between a data and charge cable!  Try using the
+    cable with other devices or swapping to another cable to confirm it is not
+    the problem.
+
+  - **Be sure you are supplying adequate power to the board.**  Check the specs of
+    your board and plug in an external power supply.  In many cases just
+    plugging a board into your computer is not enough to power it and other
+    peripherals.
+
+  - **Double check all soldering joints and connections.**  Flakey connections
+    cause many mysterious problems.  See the [guide to excellent soldering](https://learn.adafruit.com/adafruit-guide-excellent-soldering/tools) for examples of good solder joints.
+
+  - **Ensure you are using an official Arduino or Adafruit board.** We can't
+    guarantee a clone board will have the same functionality and work as expected
+    with this code and don't support them.
+
+If you're sure this issue is a defect in the code and checked the steps above
+please fill in the following fields to provide enough troubleshooting information.
+You may delete the guideline and text above to just leave the following details:
+
+- Arduino board:  **INSERT ARDUINO BOARD NAME/TYPE HERE**
+
+- Arduino IDE version (found in Arduino -> About Arduino menu):  **INSERT ARDUINO
+  VERSION HERE**
+
+- List the steps to reproduce the problem below (if possible attach a sketch or
+  copy the sketch code in too): **LIST REPRO STEPS BELOW**

lib/Adafruit_BusIO/.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,26 @@
+Thank you for creating a pull request to contribute to Adafruit's GitHub code!
+Before you open the request please review the following guidelines and tips to
+help it be more easily integrated:
+
+- **Describe the scope of your change--i.e. what the change does and what parts
+  of the code were modified.**  This will help us understand any risks of integrating
+  the code.
+
+- **Describe any known limitations with your change.**  For example if the change
+  doesn't apply to a supported platform of the library please mention it.
+
+- **Please run any tests or examples that can exercise your modified code.**  We
+  strive to not break users of the code and running tests/examples helps with this
+  process.
+
+Thank you again for contributing!  We will try to test and integrate the change
+as soon as we can, but be aware we have many GitHub repositories to manage and
+can't immediately respond to every request.  There is no need to bump or check in
+on a pull request (it will clutter the discussion of the request).
+
+Also don't be worried if the request is closed or not integrated--sometimes the
+priorities of Adafruit's GitHub code (education, ease of use) might not match the
+priorities of the pull request.  Don't fret, the open source community thrives on
+forks and GitHub makes it easy to keep your changes in a forked repo.
+
+After reviewing the guidelines above you can delete this text from the pull request.

lib/Adafruit_BusIO/.github/workflows/githubci.yml

@@ -0,0 +1,33 @@
+name: Arduino Library CI
+
+on: [pull_request, push, repository_dispatch]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2
+      with:
+         repository: adafruit/ci-arduino
+         path: ci
+
+    - name: Install the prerequisites
+      run: bash ci/actions_install.sh
+
+    - name: Check for correct code formatting with clang-format
+      run: python3 ci/run-clang-format.py -e "ci/*" -e "bin/*" -r .
+
+    - name: Check for correct documentation with doxygen
+      env:
+        GH_REPO_TOKEN: ${{ secrets.GH_REPO_TOKEN }}
+        PRETTYNAME : "Adafruit Bus IO Library"
+      run: bash ci/doxy_gen_and_deploy.sh
+
+    - name: Test the code on supported platforms
+      run: python3 ci/build_platform.py main_platforms zero feather32u4
+

lib/Adafruit_BusIO/Adafruit_BusIO_Register.cpp

@@ -0,0 +1,365 @@
+#include <Adafruit_BusIO_Register.h>
+
+#if !defined(SPI_INTERFACES_COUNT) ||                                          \
+    (defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
+
+/*!
+ *    @brief  Create a register we access over an I2C Device (which defines the
+ * bus and address)
+ *    @param  i2cdevice The I2CDevice to use for underlying I2C access
+ *    @param  reg_addr The address pointer value for the I2C/SMBus register, can
+ * be 8 or 16 bits
+ *    @param  width    The width of the register data itself, defaults to 1 byte
+ *    @param  byteorder The byte order of the register (used when width is > 1),
+ * defaults to LSBFIRST
+ *    @param  address_width The width of the register address itself, defaults
+ * to 1 byte
+ */
+Adafruit_BusIO_Register::Adafruit_BusIO_Register(Adafruit_I2CDevice *i2cdevice,
+                                                 uint16_t reg_addr,
+                                                 uint8_t width,
+                                                 uint8_t byteorder,
+                                                 uint8_t address_width) {
+  _i2cdevice = i2cdevice;
+  _spidevice = nullptr;
+  _addrwidth = address_width;
+  _address = reg_addr;
+  _byteorder = byteorder;
+  _width = width;
+}
+
+/*!
+ *    @brief  Create a register we access over an SPI Device (which defines the
+ * bus and CS pin)
+ *    @param  spidevice The SPIDevice to use for underlying SPI access
+ *    @param  reg_addr The address pointer value for the SPI register, can
+ * be 8 or 16 bits
+ *    @param  type     The method we use to read/write data to SPI (which is not
+ * as well defined as I2C)
+ *    @param  width    The width of the register data itself, defaults to 1 byte
+ *    @param  byteorder The byte order of the register (used when width is > 1),
+ * defaults to LSBFIRST
+ *    @param  address_width The width of the register address itself, defaults
+ * to 1 byte
+ */
+Adafruit_BusIO_Register::Adafruit_BusIO_Register(Adafruit_SPIDevice *spidevice,
+                                                 uint16_t reg_addr,
+                                                 Adafruit_BusIO_SPIRegType type,
+                                                 uint8_t width,
+                                                 uint8_t byteorder,
+                                                 uint8_t address_width) {
+  _spidevice = spidevice;
+  _spiregtype = type;
+  _i2cdevice = nullptr;
+  _addrwidth = address_width;
+  _address = reg_addr;
+  _byteorder = byteorder;
+  _width = width;
+}
+
+/*!
+ *    @brief  Create a register we access over an I2C or SPI Device. This is a
+ * handy function because we can pass in nullptr for the unused interface,
+ * allowing libraries to mass-define all the registers
+ *    @param  i2cdevice The I2CDevice to use for underlying I2C access, if
+ * nullptr we use SPI
+ *    @param  spidevice The SPIDevice to use for underlying SPI access, if
+ * nullptr we use I2C
+ *    @param  reg_addr The address pointer value for the I2C/SMBus/SPI register,
+ * can be 8 or 16 bits
+ *    @param  type     The method we use to read/write data to SPI (which is not
+ * as well defined as I2C)
+ *    @param  width    The width of the register data itself, defaults to 1 byte
+ *    @param  byteorder The byte order of the register (used when width is > 1),
+ * defaults to LSBFIRST
+ *    @param  address_width The width of the register address itself, defaults
+ * to 1 byte
+ */
+Adafruit_BusIO_Register::Adafruit_BusIO_Register(
+    Adafruit_I2CDevice *i2cdevice, Adafruit_SPIDevice *spidevice,
+    Adafruit_BusIO_SPIRegType type, uint16_t reg_addr, uint8_t width,
+    uint8_t byteorder, uint8_t address_width) {
+  _spidevice = spidevice;
+  _i2cdevice = i2cdevice;
+  _spiregtype = type;
+  _addrwidth = address_width;
+  _address = reg_addr;
+  _byteorder = byteorder;
+  _width = width;
+}
+
+/*!
+ *    @brief  Write a buffer of data to the register location
+ *    @param  buffer Pointer to data to write
+ *    @param  len Number of bytes to write
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::write(uint8_t *buffer, uint8_t len) {
+
+  uint8_t addrbuffer[2] = {(uint8_t)(_address & 0xFF),
+                           (uint8_t)(_address >> 8)};
+
+  if (_i2cdevice) {
+    return _i2cdevice->write(buffer, len, true, addrbuffer, _addrwidth);
+  }
+  if (_spidevice) {
+    if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
+      // very special case!
+
+      // pass the special opcode address which we set as the high byte of the
+      // regaddr
+      addrbuffer[0] =
+          (uint8_t)(_address >> 8) & ~0x01; // set bottom bit low to write
+      // the 'actual' reg addr is the second byte then
+      addrbuffer[1] = (uint8_t)(_address & 0xFF);
+      // the address appears to be a byte longer
+      return _spidevice->write(buffer, len, addrbuffer, _addrwidth + 1);
+    }
+
+    if (_spiregtype == ADDRBIT8_HIGH_TOREAD) {
+      addrbuffer[0] &= ~0x80;
+    }
+    if (_spiregtype == ADDRBIT8_HIGH_TOWRITE) {
+      addrbuffer[0] |= 0x80;
+    }
+    if (_spiregtype == AD8_HIGH_TOREAD_AD7_HIGH_TOINC) {
+      addrbuffer[0] &= ~0x80;
+      addrbuffer[0] |= 0x40;
+    }
+    return _spidevice->write(buffer, len, addrbuffer, _addrwidth);
+  }
+  return false;
+}
+
+/*!
+ *    @brief  Write up to 4 bytes of data to the register location
+ *    @param  value Data to write
+ *    @param  numbytes How many bytes from 'value' to write
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::write(uint32_t value, uint8_t numbytes) {
+  if (numbytes == 0) {
+    numbytes = _width;
+  }
+  if (numbytes > 4) {
+    return false;
+  }
+
+  // store a copy
+  _cached = value;
+
+  for (int i = 0; i < numbytes; i++) {
+    if (_byteorder == LSBFIRST) {
+      _buffer[i] = value & 0xFF;
+    } else {
+      _buffer[numbytes - i - 1] = value & 0xFF;
+    }
+    value >>= 8;
+  }
+  return write(_buffer, numbytes);
+}
+
+/*!
+ *    @brief  Read data from the register location. This does not do any error
+ * checking!
+ *    @return Returns 0xFFFFFFFF on failure, value otherwise
+ */
+uint32_t Adafruit_BusIO_Register::read(void) {
+  if (!read(_buffer, _width)) {
+    return -1;
+  }
+
+  uint32_t value = 0;
+
+  for (int i = 0; i < _width; i++) {
+    value <<= 8;
+    if (_byteorder == LSBFIRST) {
+      value |= _buffer[_width - i - 1];
+    } else {
+      value |= _buffer[i];
+    }
+  }
+
+  return value;
+}
+
+/*!
+ *    @brief  Read cached data from last time we wrote to this register
+ *    @return Returns 0xFFFFFFFF on failure, value otherwise
+ */
+uint32_t Adafruit_BusIO_Register::readCached(void) { return _cached; }
+
+/*!
+ *    @brief  Read a buffer of data from the register location
+ *    @param  buffer Pointer to data to read into
+ *    @param  len Number of bytes to read
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::read(uint8_t *buffer, uint8_t len) {
+  uint8_t addrbuffer[2] = {(uint8_t)(_address & 0xFF),
+                           (uint8_t)(_address >> 8)};
+
+  if (_i2cdevice) {
+    return _i2cdevice->write_then_read(addrbuffer, _addrwidth, buffer, len);
+  }
+  if (_spidevice) {
+    if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
+      // very special case!
+
+      // pass the special opcode address which we set as the high byte of the
+      // regaddr
+      addrbuffer[0] =
+          (uint8_t)(_address >> 8) | 0x01; // set bottom bit high to read
+      // the 'actual' reg addr is the second byte then
+      addrbuffer[1] = (uint8_t)(_address & 0xFF);
+      // the address appears to be a byte longer
+      return _spidevice->write_then_read(addrbuffer, _addrwidth + 1, buffer,
+                                         len);
+    }
+    if (_spiregtype == ADDRBIT8_HIGH_TOREAD) {
+      addrbuffer[0] |= 0x80;
+    }
+    if (_spiregtype == ADDRBIT8_HIGH_TOWRITE) {
+      addrbuffer[0] &= ~0x80;
+    }
+    if (_spiregtype == AD8_HIGH_TOREAD_AD7_HIGH_TOINC) {
+      addrbuffer[0] |= 0x80 | 0x40;
+    }
+    return _spidevice->write_then_read(addrbuffer, _addrwidth, buffer, len);
+  }
+  return false;
+}
+
+/*!
+ *    @brief  Read 2 bytes of data from the register location
+ *    @param  value Pointer to uint16_t variable to read into
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::read(uint16_t *value) {
+  if (!read(_buffer, 2)) {
+    return false;
+  }
+
+  if (_byteorder == LSBFIRST) {
+    *value = _buffer[1];
+    *value <<= 8;
+    *value |= _buffer[0];
+  } else {
+    *value = _buffer[0];
+    *value <<= 8;
+    *value |= _buffer[1];
+  }
+  return true;
+}
+
+/*!
+ *    @brief  Read 1 byte of data from the register location
+ *    @param  value Pointer to uint8_t variable to read into
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::read(uint8_t *value) {
+  if (!read(_buffer, 1)) {
+    return false;
+  }
+
+  *value = _buffer[0];
+  return true;
+}
+
+/*!
+ *    @brief  Pretty printer for this register
+ *    @param  s The Stream to print to, defaults to &Serial
+ */
+void Adafruit_BusIO_Register::print(Stream *s) {
+  uint32_t val = read();
+  s->print("0x");
+  s->print(val, HEX);
+}
+
+/*!
+ *    @brief  Pretty printer for this register
+ *    @param  s The Stream to print to, defaults to &Serial
+ */
+void Adafruit_BusIO_Register::println(Stream *s) {
+  print(s);
+  s->println();
+}
+
+/*!
+ *    @brief  Create a slice of the register that we can address without
+ * touching other bits
+ *    @param  reg The Adafruit_BusIO_Register which defines the bus/register
+ *    @param  bits The number of bits wide we are slicing
+ *    @param  shift The number of bits that our bit-slice is shifted from LSB
+ */
+Adafruit_BusIO_RegisterBits::Adafruit_BusIO_RegisterBits(
+    Adafruit_BusIO_Register *reg, uint8_t bits, uint8_t shift) {
+  _register = reg;
+  _bits = bits;
+  _shift = shift;
+}
+
+/*!
+ *    @brief  Read 4 bytes of data from the register
+ *    @return  data The 4 bytes to read
+ */
+uint32_t Adafruit_BusIO_RegisterBits::read(void) {
+  uint32_t val = _register->read();
+  val >>= _shift;
+  return val & ((1 << (_bits)) - 1);
+}
+
+/*!
+ *    @brief  Write 4 bytes of data to the register
+ *    @param  data The 4 bytes to write
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_RegisterBits::write(uint32_t data) {
+  uint32_t val = _register->read();
+
+  // mask off the data before writing
+  uint32_t mask = (1 << (_bits)) - 1;
+  data &= mask;
+
+  mask <<= _shift;
+  val &= ~mask;          // remove the current data at that spot
+  val |= data << _shift; // and add in the new data
+
+  return _register->write(val, _register->width());
+}
+
+/*!
+ *    @brief  The width of the register data, helpful for doing calculations
+ *    @returns The data width used when initializing the register
+ */
+uint8_t Adafruit_BusIO_Register::width(void) { return _width; }
+
+/*!
+ *    @brief  Set the default width of data
+ *    @param width the default width of data read from register
+ */
+void Adafruit_BusIO_Register::setWidth(uint8_t width) { _width = width; }
+
+/*!
+ *    @brief  Set register address
+ *    @param address the address from register
+ */
+void Adafruit_BusIO_Register::setAddress(uint16_t address) {
+  _address = address;
+}
+
+/*!
+ *    @brief  Set the width of register address
+ *    @param address_width the width for register address
+ */
+void Adafruit_BusIO_Register::setAddressWidth(uint16_t address_width) {
+  _addrwidth = address_width;
+}
+
+#endif // SPI exists

lib/Adafruit_BusIO/Adafruit_BusIO_Register.h

@@ -0,0 +1,105 @@
+#ifndef Adafruit_BusIO_Register_h
+#define Adafruit_BusIO_Register_h
+
+#include <Arduino.h>
+
+#if !defined(SPI_INTERFACES_COUNT) ||                                          \
+    (defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
+
+#include <Adafruit_I2CDevice.h>
+#include <Adafruit_SPIDevice.h>
+
+typedef enum _Adafruit_BusIO_SPIRegType {
+  ADDRBIT8_HIGH_TOREAD = 0,
+  /*!<
+   * ADDRBIT8_HIGH_TOREAD
+   * When reading a register you must actually send the value 0x80 + register
+   * address to the device. e.g. To read the register 0x0B the register value
+   * 0x8B is sent and to write 0x0B is sent.
+   */
+  AD8_HIGH_TOREAD_AD7_HIGH_TOINC = 1,
+
+  /*!<
+   * ADDRBIT8_HIGH_TOWRITE
+   * When writing to a register you must actually send the value 0x80 +
+   * the register address to the device. e.g. To write to the register 0x19 the
+   * register value 0x99 is sent and to read 0x19 is sent.
+   */
+  ADDRBIT8_HIGH_TOWRITE = 2,
+
+  /*!<
+   * ADDRESSED_OPCODE_LOWBIT_TO_WRITE
+   * Used by the MCP23S series, we send 0x40 |'rd with the opcode
+   * Then set the lowest bit to write
+   */
+  ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE = 3,
+
+} Adafruit_BusIO_SPIRegType;
+
+/*!
+ * @brief The class which defines a device register (a location to read/write
+ * data from)
+ */
+class Adafruit_BusIO_Register {
+public:
+  Adafruit_BusIO_Register(Adafruit_I2CDevice *i2cdevice, uint16_t reg_addr,
+                          uint8_t width = 1, uint8_t byteorder = LSBFIRST,
+                          uint8_t address_width = 1);
+
+  Adafruit_BusIO_Register(Adafruit_SPIDevice *spidevice, uint16_t reg_addr,
+                          Adafruit_BusIO_SPIRegType type, uint8_t width = 1,
+                          uint8_t byteorder = LSBFIRST,
+                          uint8_t address_width = 1);
+
+  Adafruit_BusIO_Register(Adafruit_I2CDevice *i2cdevice,
+                          Adafruit_SPIDevice *spidevice,
+                          Adafruit_BusIO_SPIRegType type, uint16_t reg_addr,
+                          uint8_t width = 1, uint8_t byteorder = LSBFIRST,
+                          uint8_t address_width = 1);
+
+  bool read(uint8_t *buffer, uint8_t len);
+  bool read(uint8_t *value);
+  bool read(uint16_t *value);
+  uint32_t read(void);
+  uint32_t readCached(void);
+  bool write(uint8_t *buffer, uint8_t len);
+  bool write(uint32_t value, uint8_t numbytes = 0);
+
+  uint8_t width(void);
+
+  void setWidth(uint8_t width);
+  void setAddress(uint16_t address);
+  void setAddressWidth(uint16_t address_width);
+
+  void print(Stream *s = &Serial);
+  void println(Stream *s = &Serial);
+
+private:
+  Adafruit_I2CDevice *_i2cdevice;
+  Adafruit_SPIDevice *_spidevice;
+  Adafruit_BusIO_SPIRegType _spiregtype;
+  uint16_t _address;
+  uint8_t _width, _addrwidth, _byteorder;
+  uint8_t _buffer[4]; // we won't support anything larger than uint32 for
+                      // non-buffered read
+  uint32_t _cached = 0;
+};
+
+/*!
+ * @brief The class which defines a slice of bits from within a device register
+ * (a location to read/write data from)
+ */
+class Adafruit_BusIO_RegisterBits {
+public:
+  Adafruit_BusIO_RegisterBits(Adafruit_BusIO_Register *reg, uint8_t bits,
+                              uint8_t shift);
+  bool write(uint32_t value);
+  uint32_t read(void);
+
+private:
+  Adafruit_BusIO_Register *_register;
+  uint8_t _bits, _shift;
+};
+
+#endif // SPI exists
+#endif // BusIO_Register_h

lib/Adafruit_BusIO/Adafruit_I2CDevice.cpp

@@ -0,0 +1,313 @@
+#include "Adafruit_I2CDevice.h"
+
+//#define DEBUG_SERIAL Serial
+
+/*!
+ *    @brief  Create an I2C device at a given address
+ *    @param  addr The 7-bit I2C address for the device
+ *    @param  theWire The I2C bus to use, defaults to &Wire
+ */
+Adafruit_I2CDevice::Adafruit_I2CDevice(uint8_t addr, TwoWire *theWire) {
+  _addr = addr;
+  _wire = theWire;
+  _begun = false;
+#ifdef ARDUINO_ARCH_SAMD
+  _maxBufferSize = 250; // as defined in Wire.h's RingBuffer
+#elif defined(ESP32)
+  _maxBufferSize = I2C_BUFFER_LENGTH;
+#else
+  _maxBufferSize = 32;
+#endif
+}
+
+/*!
+ *    @brief  Initializes and does basic address detection
+ *    @param  addr_detect Whether we should attempt to detect the I2C address
+ * with a scan. 99% of sensors/devices don't mind but once in a while, they spaz
+ * on a scan!
+ *    @return True if I2C initialized and a device with the addr found
+ */
+bool Adafruit_I2CDevice::begin(bool addr_detect) {
+  _wire->begin();
+  _begun = true;
+
+  if (addr_detect) {
+    return detected();
+  }
+  return true;
+}
+
+/*!
+ *    @brief  De-initialize device, turn off the Wire interface
+ */
+void Adafruit_I2CDevice::end(void) {
+  // Not all port implement Wire::end(), such as
+  // - ESP8266
+  // - AVR core without WIRE_HAS_END
+  // - ESP32: end() is implemented since 2.0.1 which is latest at the moment.
+  // Temporarily disable for now to give time for user to update.
+#if !(defined(ESP8266) ||                                                      \
+      (defined(ARDUINO_ARCH_AVR) && !defined(WIRE_HAS_END)) ||                 \
+      defined(ARDUINO_ARCH_ESP32))
+  _wire->end();
+  _begun = false;
+#endif
+}
+
+/*!
+ *    @brief  Scans I2C for the address - note will give a false-positive
+ *    if there's no pullups on I2C
+ *    @return True if I2C initialized and a device with the addr found
+ */
+bool Adafruit_I2CDevice::detected(void) {
+  // Init I2C if not done yet
+  if (!_begun && !begin()) {
+    return false;
+  }
+
+  // A basic scanner, see if it ACK's
+  _wire->beginTransmission(_addr);
+  if (_wire->endTransmission() == 0) {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println(F("Detected"));
+#endif
+    return true;
+  }
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.println(F("Not detected"));
+#endif
+  return false;
+}
+
+/*!
+ *    @brief  Write a buffer or two to the I2C device. Cannot be more than
+ * maxBufferSize() bytes.
+ *    @param  buffer Pointer to buffer of data to write. This is const to
+ *            ensure the content of this buffer doesn't change.
+ *    @param  len Number of bytes from buffer to write
+ *    @param  prefix_buffer Pointer to optional array of data to write before
+ * buffer. Cannot be more than maxBufferSize() bytes. This is const to
+ *            ensure the content of this buffer doesn't change.
+ *    @param  prefix_len Number of bytes from prefix buffer to write
+ *    @param  stop Whether to send an I2C STOP signal on write
+ *    @return True if write was successful, otherwise false.
+ */
+bool Adafruit_I2CDevice::write(const uint8_t *buffer, size_t len, bool stop,
+                               const uint8_t *prefix_buffer,
+                               size_t prefix_len) {
+  if ((len + prefix_len) > maxBufferSize()) {
+    // currently not guaranteed to work if more than 32 bytes!
+    // we will need to find out if some platforms have larger
+    // I2C buffer sizes :/
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println(F("\tI2CDevice could not write such a large buffer"));
+#endif
+    return false;
+  }
+
+  _wire->beginTransmission(_addr);
+
+  // Write the prefix data (usually an address)
+  if ((prefix_len != 0) && (prefix_buffer != nullptr)) {
+    if (_wire->write(prefix_buffer, prefix_len) != prefix_len) {
+#ifdef DEBUG_SERIAL
+      DEBUG_SERIAL.println(F("\tI2CDevice failed to write"));
+#endif
+      return false;
+    }
+  }
+
+  // Write the data itself
+  if (_wire->write(buffer, len) != len) {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println(F("\tI2CDevice failed to write"));
+#endif
+    return false;
+  }
+
+#ifdef DEBUG_SERIAL
+
+  DEBUG_SERIAL.print(F("\tI2CWRITE @ 0x"));
+  DEBUG_SERIAL.print(_addr, HEX);
+  DEBUG_SERIAL.print(F(" :: "));
+  if ((prefix_len != 0) && (prefix_buffer != nullptr)) {
+    for (uint16_t i = 0; i < prefix_len; i++) {
+      DEBUG_SERIAL.print(F("0x"));
+      DEBUG_SERIAL.print(prefix_buffer[i], HEX);
+      DEBUG_SERIAL.print(F(", "));
+    }
+  }
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (i % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+
+  if (stop) {
+    DEBUG_SERIAL.print("\tSTOP");
+  }
+#endif
+
+  if (_wire->endTransmission(stop) == 0) {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println();
+    // DEBUG_SERIAL.println("Sent!");
+#endif
+    return true;
+  } else {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println("\tFailed to send!");
+#endif
+    return false;
+  }
+}
+
+/*!
+ *    @brief  Read from I2C into a buffer from the I2C device.
+ *    Cannot be more than maxBufferSize() bytes.
+ *    @param  buffer Pointer to buffer of data to read into
+ *    @param  len Number of bytes from buffer to read.
+ *    @param  stop Whether to send an I2C STOP signal on read
+ *    @return True if read was successful, otherwise false.
+ */
+bool Adafruit_I2CDevice::read(uint8_t *buffer, size_t len, bool stop) {
+  size_t pos = 0;
+  while (pos < len) {
+    size_t read_len =
+        ((len - pos) > maxBufferSize()) ? maxBufferSize() : (len - pos);
+    bool read_stop = (pos < (len - read_len)) ? false : stop;
+    if (!_read(buffer + pos, read_len, read_stop))
+      return false;
+    pos += read_len;
+  }
+  return true;
+}
+
+bool Adafruit_I2CDevice::_read(uint8_t *buffer, size_t len, bool stop) {
+#if defined(TinyWireM_h)
+  size_t recv = _wire->requestFrom((uint8_t)_addr, (uint8_t)len);
+#elif defined(ARDUINO_ARCH_MEGAAVR)
+  size_t recv = _wire->requestFrom(_addr, len, stop);
+#else
+  size_t recv = _wire->requestFrom((uint8_t)_addr, (uint8_t)len, (uint8_t)stop);
+#endif
+
+  if (recv != len) {
+    // Not enough data available to fulfill our obligation!
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.print(F("\tI2CDevice did not receive enough data: "));
+    DEBUG_SERIAL.println(recv);
+#endif
+    return false;
+  }
+
+  for (uint16_t i = 0; i < len; i++) {
+    buffer[i] = _wire->read();
+  }
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tI2CREAD  @ 0x"));
+  DEBUG_SERIAL.print(_addr, HEX);
+  DEBUG_SERIAL.print(F(" :: "));
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  return true;
+}
+
+/*!
+ *    @brief  Write some data, then read some data from I2C into another buffer.
+ *    Cannot be more than maxBufferSize() bytes. The buffers can point to
+ *    same/overlapping locations.
+ *    @param  write_buffer Pointer to buffer of data to write from
+ *    @param  write_len Number of bytes from buffer to write.
+ *    @param  read_buffer Pointer to buffer of data to read into.
+ *    @param  read_len Number of bytes from buffer to read.
+ *    @param  stop Whether to send an I2C STOP signal between the write and read
+ *    @return True if write & read was successful, otherwise false.
+ */
+bool Adafruit_I2CDevice::write_then_read(const uint8_t *write_buffer,
+                                         size_t write_len, uint8_t *read_buffer,
+                                         size_t read_len, bool stop) {
+  if (!write(write_buffer, write_len, stop)) {
+    return false;
+  }
+
+  return read(read_buffer, read_len);
+}
+
+/*!
+ *    @brief  Returns the 7-bit address of this device
+ *    @return The 7-bit address of this device
+ */
+uint8_t Adafruit_I2CDevice::address(void) { return _addr; }
+
+/*!
+ *    @brief  Change the I2C clock speed to desired (relies on
+ *    underlying Wire support!
+ *    @param desiredclk The desired I2C SCL frequency
+ *    @return True if this platform supports changing I2C speed.
+ *    Not necessarily that the speed was achieved!
+ */
+bool Adafruit_I2CDevice::setSpeed(uint32_t desiredclk) {
+#if defined(__AVR_ATmega328__) ||                                              \
+    defined(__AVR_ATmega328P__) // fix arduino core set clock
+  // calculate TWBR correctly
+
+  if ((F_CPU / 18) < desiredclk) {
+#ifdef DEBUG_SERIAL
+    Serial.println(F("I2C.setSpeed too high."));
+#endif
+    return false;
+  }
+  uint32_t atwbr = ((F_CPU / desiredclk) - 16) / 2;
+  if (atwbr > 16320) {
+#ifdef DEBUG_SERIAL
+    Serial.println(F("I2C.setSpeed too low."));
+#endif
+    return false;
+  }
+
+  if (atwbr <= 255) {
+    atwbr /= 1;
+    TWSR = 0x0;
+  } else if (atwbr <= 1020) {
+    atwbr /= 4;
+    TWSR = 0x1;
+  } else if (atwbr <= 4080) {
+    atwbr /= 16;
+    TWSR = 0x2;
+  } else { //  if (atwbr <= 16320)
+    atwbr /= 64;
+    TWSR = 0x3;
+  }
+  TWBR = atwbr;
+
+#ifdef DEBUG_SERIAL
+  Serial.print(F("TWSR prescaler = "));
+  Serial.println(pow(4, TWSR));
+  Serial.print(F("TWBR = "));
+  Serial.println(atwbr);
+#endif
+  return true;
+#elif (ARDUINO >= 157) && !defined(ARDUINO_STM32_FEATHER) &&                   \
+    !defined(TinyWireM_h)
+  _wire->setClock(desiredclk);
+  return true;
+
+#else
+  (void)desiredclk;
+  return false;
+#endif
+}

lib/Adafruit_BusIO/Adafruit_I2CDevice.h

@@ -0,0 +1,36 @@
+#ifndef Adafruit_I2CDevice_h
+#define Adafruit_I2CDevice_h
+
+#include <Arduino.h>
+#include <Wire.h>
+
+///< The class which defines how we will talk to this device over I2C
+class Adafruit_I2CDevice {
+public:
+  Adafruit_I2CDevice(uint8_t addr, TwoWire *theWire = &Wire);
+  uint8_t address(void);
+  bool begin(bool addr_detect = true);
+  void end(void);
+  bool detected(void);
+
+  bool read(uint8_t *buffer, size_t len, bool stop = true);
+  bool write(const uint8_t *buffer, size_t len, bool stop = true,
+             const uint8_t *prefix_buffer = nullptr, size_t prefix_len = 0);
+  bool write_then_read(const uint8_t *write_buffer, size_t write_len,
+                       uint8_t *read_buffer, size_t read_len,
+                       bool stop = false);
+  bool setSpeed(uint32_t desiredclk);
+
+  /*!   @brief  How many bytes we can read in a transaction
+   *    @return The size of the Wire receive/transmit buffer */
+  size_t maxBufferSize() { return _maxBufferSize; }
+
+private:
+  uint8_t _addr;
+  TwoWire *_wire;
+  bool _begun;
+  size_t _maxBufferSize;
+  bool _read(uint8_t *buffer, size_t len, bool stop);
+};
+
+#endif // Adafruit_I2CDevice_h

lib/Adafruit_BusIO/Adafruit_I2CRegister.h

@@ -0,0 +1,10 @@
+#ifndef _ADAFRUIT_I2C_REGISTER_H_
+#define _ADAFRUIT_I2C_REGISTER_H_
+
+#include <Adafruit_BusIO_Register.h>
+#include <Arduino.h>
+
+typedef Adafruit_BusIO_Register Adafruit_I2CRegister;
+typedef Adafruit_BusIO_RegisterBits Adafruit_I2CRegisterBits;
+
+#endif

lib/Adafruit_BusIO/Adafruit_SPIDevice.cpp

@@ -0,0 +1,508 @@
+#include "Adafruit_SPIDevice.h"
+
+//#define DEBUG_SERIAL Serial
+
+/*!
+ *    @brief  Create an SPI device with the given CS pin and settings
+ *    @param  cspin The arduino pin number to use for chip select
+ *    @param  freq The SPI clock frequency to use, defaults to 1MHz
+ *    @param  dataOrder The SPI data order to use for bits within each byte,
+ * defaults to SPI_BITORDER_MSBFIRST
+ *    @param  dataMode The SPI mode to use, defaults to SPI_MODE0
+ *    @param  theSPI The SPI bus to use, defaults to &theSPI
+ */
+Adafruit_SPIDevice::Adafruit_SPIDevice(int8_t cspin, uint32_t freq,
+                                       BusIOBitOrder dataOrder,
+                                       uint8_t dataMode, SPIClass *theSPI) {
+#ifdef BUSIO_HAS_HW_SPI
+  _cs = cspin;
+  _sck = _mosi = _miso = -1;
+  _spi = theSPI;
+  _begun = false;
+  _spiSetting = new SPISettings(freq, dataOrder, dataMode);
+  _freq = freq;
+  _dataOrder = dataOrder;
+  _dataMode = dataMode;
+#else
+  // unused, but needed to suppress compiler warns
+  (void)cspin;
+  (void)freq;
+  (void)dataOrder;
+  (void)dataMode;
+  (void)theSPI;
+#endif
+}
+
+/*!
+ *    @brief  Create an SPI device with the given CS pin and settings
+ *    @param  cspin The arduino pin number to use for chip select
+ *    @param  sckpin The arduino pin number to use for SCK
+ *    @param  misopin The arduino pin number to use for MISO, set to -1 if not
+ * used
+ *    @param  mosipin The arduino pin number to use for MOSI, set to -1 if not
+ * used
+ *    @param  freq The SPI clock frequency to use, defaults to 1MHz
+ *    @param  dataOrder The SPI data order to use for bits within each byte,
+ * defaults to SPI_BITORDER_MSBFIRST
+ *    @param  dataMode The SPI mode to use, defaults to SPI_MODE0
+ */
+Adafruit_SPIDevice::Adafruit_SPIDevice(int8_t cspin, int8_t sckpin,
+                                       int8_t misopin, int8_t mosipin,
+                                       uint32_t freq, BusIOBitOrder dataOrder,
+                                       uint8_t dataMode) {
+  _cs = cspin;
+  _sck = sckpin;
+  _miso = misopin;
+  _mosi = mosipin;
+
+#ifdef BUSIO_USE_FAST_PINIO
+  csPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(cspin));
+  csPinMask = digitalPinToBitMask(cspin);
+  if (mosipin != -1) {
+    mosiPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(mosipin));
+    mosiPinMask = digitalPinToBitMask(mosipin);
+  }
+  if (misopin != -1) {
+    misoPort = (BusIO_PortReg *)portInputRegister(digitalPinToPort(misopin));
+    misoPinMask = digitalPinToBitMask(misopin);
+  }
+  clkPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(sckpin));
+  clkPinMask = digitalPinToBitMask(sckpin);
+#endif
+
+  _freq = freq;
+  _dataOrder = dataOrder;
+  _dataMode = dataMode;
+  _begun = false;
+}
+
+/*!
+ *    @brief  Release memory allocated in constructors
+ */
+Adafruit_SPIDevice::~Adafruit_SPIDevice() {
+  if (_spiSetting)
+    delete _spiSetting;
+}
+
+/*!
+ *    @brief  Initializes SPI bus and sets CS pin high
+ *    @return Always returns true because there's no way to test success of SPI
+ * init
+ */
+bool Adafruit_SPIDevice::begin(void) {
+  if (_cs != -1) {
+    pinMode(_cs, OUTPUT);
+    digitalWrite(_cs, HIGH);
+  }
+
+  if (_spi) { // hardware SPI
+#ifdef BUSIO_HAS_HW_SPI
+    _spi->begin();
+#endif
+  } else {
+    pinMode(_sck, OUTPUT);
+
+    if ((_dataMode == SPI_MODE0) || (_dataMode == SPI_MODE1)) {
+      // idle low on mode 0 and 1
+      digitalWrite(_sck, LOW);
+    } else {
+      // idle high on mode 2 or 3
+      digitalWrite(_sck, HIGH);
+    }
+    if (_mosi != -1) {
+      pinMode(_mosi, OUTPUT);
+      digitalWrite(_mosi, HIGH);
+    }
+    if (_miso != -1) {
+      pinMode(_miso, INPUT);
+    }
+  }
+
+  _begun = true;
+  return true;
+}
+
+/*!
+ *    @brief  Transfer (send/receive) a buffer over hard/soft SPI, without
+ * transaction management
+ *    @param  buffer The buffer to send and receive at the same time
+ *    @param  len    The number of bytes to transfer
+ */
+void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
+  //
+  // HARDWARE SPI
+  //
+  if (_spi) {
+#ifdef BUSIO_HAS_HW_SPI
+#if defined(SPARK)
+    _spi->transfer(buffer, buffer, len, nullptr);
+#elif defined(STM32)
+    for (size_t i = 0; i < len; i++) {
+      _spi->transfer(buffer[i]);
+    }
+#else
+    _spi->transfer(buffer, len);
+#endif
+    return;
+#endif
+  }
+
+  //
+  // SOFTWARE SPI
+  //
+  uint8_t startbit;
+  if (_dataOrder == SPI_BITORDER_LSBFIRST) {
+    startbit = 0x1;
+  } else {
+    startbit = 0x80;
+  }
+
+  bool towrite, lastmosi = !(buffer[0] & startbit);
+  uint8_t bitdelay_us = (1000000 / _freq) / 2;
+
+  for (size_t i = 0; i < len; i++) {
+    uint8_t reply = 0;
+    uint8_t send = buffer[i];
+
+    /*
+    Serial.print("\tSending software SPI byte 0x");
+    Serial.print(send, HEX);
+    Serial.print(" -> 0x");
+    */
+
+    // Serial.print(send, HEX);
+    for (uint8_t b = startbit; b != 0;
+         b = (_dataOrder == SPI_BITORDER_LSBFIRST) ? b << 1 : b >> 1) {
+
+      if (bitdelay_us) {
+        delayMicroseconds(bitdelay_us);
+      }
+
+      if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) {
+        towrite = send & b;
+        if ((_mosi != -1) && (lastmosi != towrite)) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (towrite)
+            *mosiPort |= mosiPinMask;
+          else
+            *mosiPort &= ~mosiPinMask;
+#else
+          digitalWrite(_mosi, towrite);
+#endif
+          lastmosi = towrite;
+        }
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort |= clkPinMask; // Clock high
+#else
+        digitalWrite(_sck, HIGH);
+#endif
+
+        if (bitdelay_us) {
+          delayMicroseconds(bitdelay_us);
+        }
+
+        if (_miso != -1) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (*misoPort & misoPinMask) {
+#else
+          if (digitalRead(_miso)) {
+#endif
+            reply |= b;
+          }
+        }
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort &= ~clkPinMask; // Clock low
+#else
+        digitalWrite(_sck, LOW);
+#endif
+      } else { // if (_dataMode == SPI_MODE1 || _dataMode == SPI_MODE3)
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort |= clkPinMask; // Clock high
+#else
+        digitalWrite(_sck, HIGH);
+#endif
+
+        if (bitdelay_us) {
+          delayMicroseconds(bitdelay_us);
+        }
+
+        if (_mosi != -1) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (send & b)
+            *mosiPort |= mosiPinMask;
+          else
+            *mosiPort &= ~mosiPinMask;
+#else
+          digitalWrite(_mosi, send & b);
+#endif
+        }
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort &= ~clkPinMask; // Clock low
+#else
+        digitalWrite(_sck, LOW);
+#endif
+
+        if (_miso != -1) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (*misoPort & misoPinMask) {
+#else
+          if (digitalRead(_miso)) {
+#endif
+            reply |= b;
+          }
+        }
+      }
+      if (_miso != -1) {
+        buffer[i] = reply;
+      }
+    }
+  }
+  return;
+}
+
+/*!
+ *    @brief  Transfer (send/receive) one byte over hard/soft SPI, without
+ * transaction management
+ *    @param  send The byte to send
+ *    @return The byte received while transmitting
+ */
+uint8_t Adafruit_SPIDevice::transfer(uint8_t send) {
+  uint8_t data = send;
+  transfer(&data, 1);
+  return data;
+}
+
+/*!
+ *    @brief  Manually begin a transaction (calls beginTransaction if hardware
+ * SPI)
+ */
+void Adafruit_SPIDevice::beginTransaction(void) {
+  if (_spi) {
+#ifdef BUSIO_HAS_HW_SPI
+    _spi->beginTransaction(*_spiSetting);
+#endif
+  }
+}
+
+/*!
+ *    @brief  Manually end a transaction (calls endTransaction if hardware SPI)
+ */
+void Adafruit_SPIDevice::endTransaction(void) {
+  if (_spi) {
+#ifdef BUSIO_HAS_HW_SPI
+    _spi->endTransaction();
+#endif
+  }
+}
+
+/*!
+ *    @brief  Assert/Deassert the CS pin if it is defined
+ *    @param  value The state the CS is set to
+ */
+void Adafruit_SPIDevice::setChipSelect(int value) {
+  if (_cs != -1) {
+    digitalWrite(_cs, value);
+  }
+}
+
+/*!
+ *    @brief  Write a buffer or two to the SPI device, with transaction
+ * management.
+ *    @brief  Manually begin a transaction (calls beginTransaction if hardware
+ *            SPI) with asserting the CS pin
+ */
+void Adafruit_SPIDevice::beginTransactionWithAssertingCS() {
+  beginTransaction();
+  setChipSelect(LOW);
+}
+
+/*!
+ *    @brief  Manually end a transaction (calls endTransaction if hardware SPI)
+ *            with deasserting the CS pin
+ */
+void Adafruit_SPIDevice::endTransactionWithDeassertingCS() {
+  setChipSelect(HIGH);
+  endTransaction();
+}
+
+/*!
+ *    @brief  Write a buffer or two to the SPI device, with transaction
+ * management.
+ *    @param  buffer Pointer to buffer of data to write
+ *    @param  len Number of bytes from buffer to write
+ *    @param  prefix_buffer Pointer to optional array of data to write before
+ * buffer.
+ *    @param  prefix_len Number of bytes from prefix buffer to write
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::write(const uint8_t *buffer, size_t len,
+                               const uint8_t *prefix_buffer,
+                               size_t prefix_len) {
+  beginTransactionWithAssertingCS();
+
+  // do the writing
+#if defined(ARDUINO_ARCH_ESP32)
+  if (_spi) {
+    if (prefix_len > 0) {
+      _spi->transferBytes(prefix_buffer, nullptr, prefix_len);
+    }
+    if (len > 0) {
+      _spi->transferBytes(buffer, nullptr, len);
+    }
+  } else
+#endif
+  {
+    for (size_t i = 0; i < prefix_len; i++) {
+      transfer(prefix_buffer[i]);
+    }
+    for (size_t i = 0; i < len; i++) {
+      transfer(buffer[i]);
+    }
+  }
+  endTransactionWithDeassertingCS();
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Wrote: "));
+  if ((prefix_len != 0) && (prefix_buffer != nullptr)) {
+    for (uint16_t i = 0; i < prefix_len; i++) {
+      DEBUG_SERIAL.print(F("0x"));
+      DEBUG_SERIAL.print(prefix_buffer[i], HEX);
+      DEBUG_SERIAL.print(F(", "));
+    }
+  }
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (i % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  return true;
+}
+
+/*!
+ *    @brief  Read from SPI into a buffer from the SPI device, with transaction
+ * management.
+ *    @param  buffer Pointer to buffer of data to read into
+ *    @param  len Number of bytes from buffer to read.
+ *    @param  sendvalue The 8-bits of data to write when doing the data read,
+ * defaults to 0xFF
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::read(uint8_t *buffer, size_t len, uint8_t sendvalue) {
+  memset(buffer, sendvalue, len); // clear out existing buffer
+
+  beginTransactionWithAssertingCS();
+  transfer(buffer, len);
+  endTransactionWithDeassertingCS();
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Read: "));
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  return true;
+}
+
+/*!
+ *    @brief  Write some data, then read some data from SPI into another buffer,
+ * with transaction management. The buffers can point to same/overlapping
+ * locations. This does not transmit-receive at the same time!
+ *    @param  write_buffer Pointer to buffer of data to write from
+ *    @param  write_len Number of bytes from buffer to write.
+ *    @param  read_buffer Pointer to buffer of data to read into.
+ *    @param  read_len Number of bytes from buffer to read.
+ *    @param  sendvalue The 8-bits of data to write when doing the data read,
+ * defaults to 0xFF
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::write_then_read(const uint8_t *write_buffer,
+                                         size_t write_len, uint8_t *read_buffer,
+                                         size_t read_len, uint8_t sendvalue) {
+  beginTransactionWithAssertingCS();
+  // do the writing
+#if defined(ARDUINO_ARCH_ESP32)
+  if (_spi) {
+    if (write_len > 0) {
+      _spi->transferBytes(write_buffer, nullptr, write_len);
+    }
+  } else
+#endif
+  {
+    for (size_t i = 0; i < write_len; i++) {
+      transfer(write_buffer[i]);
+    }
+  }
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Wrote: "));
+  for (uint16_t i = 0; i < write_len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(write_buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (write_len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  // do the reading
+  for (size_t i = 0; i < read_len; i++) {
+    read_buffer[i] = transfer(sendvalue);
+  }
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Read: "));
+  for (uint16_t i = 0; i < read_len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(read_buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (read_len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  endTransactionWithDeassertingCS();
+
+  return true;
+}
+
+/*!
+ *    @brief  Write some data and read some data at the same time from SPI
+ * into the same buffer, with transaction management. This is basicaly a wrapper
+ * for transfer() with CS-pin and transaction management. This /does/
+ * transmit-receive at the same time!
+ *    @param  buffer Pointer to buffer of data to write/read to/from
+ *    @param  len Number of bytes from buffer to write/read.
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::write_and_read(uint8_t *buffer, size_t len) {
+  beginTransactionWithAssertingCS();
+  transfer(buffer, len);
+  endTransactionWithDeassertingCS();
+
+  return true;
+}

lib/Adafruit_BusIO/Adafruit_SPIDevice.h

@@ -0,0 +1,138 @@
+#ifndef Adafruit_SPIDevice_h
+#define Adafruit_SPIDevice_h
+
+#include <Arduino.h>
+
+#if !defined(SPI_INTERFACES_COUNT) ||                                          \
+    (defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
+// HW SPI available
+#include <SPI.h>
+#define BUSIO_HAS_HW_SPI
+#else
+// SW SPI ONLY
+enum { SPI_MODE0, SPI_MODE1, SPI_MODE2, _SPI_MODE4 };
+typedef uint8_t SPIClass;
+#endif
+
+// some modern SPI definitions don't have BitOrder enum
+#if (defined(__AVR__) && !defined(ARDUINO_ARCH_MEGAAVR)) ||                    \
+    defined(ESP8266) || defined(TEENSYDUINO) || defined(SPARK) ||              \
+    defined(ARDUINO_ARCH_SPRESENSE) || defined(MEGATINYCORE) ||                \
+    defined(DXCORE) || defined(ARDUINO_AVR_ATmega4809) ||                      \
+    defined(ARDUINO_AVR_ATmega4808) || defined(ARDUINO_AVR_ATmega3209) ||      \
+    defined(ARDUINO_AVR_ATmega3208) || defined(ARDUINO_AVR_ATmega1609) ||      \
+    defined(ARDUINO_AVR_ATmega1608) || defined(ARDUINO_AVR_ATmega809) ||       \
+    defined(ARDUINO_AVR_ATmega808) || defined(ARDUINO_ARCH_ARC32)
+
+typedef enum _BitOrder {
+  SPI_BITORDER_MSBFIRST = MSBFIRST,
+  SPI_BITORDER_LSBFIRST = LSBFIRST,
+} BusIOBitOrder;
+
+#elif defined(ESP32) || defined(__ASR6501__) || defined(__ASR6502__)
+
+// some modern SPI definitions don't have BitOrder enum and have different SPI
+// mode defines
+typedef enum _BitOrder {
+  SPI_BITORDER_MSBFIRST = SPI_MSBFIRST,
+  SPI_BITORDER_LSBFIRST = SPI_LSBFIRST,
+} BusIOBitOrder;
+
+#else
+// Some platforms have a BitOrder enum but its named MSBFIRST/LSBFIRST
+#define SPI_BITORDER_MSBFIRST MSBFIRST
+#define SPI_BITORDER_LSBFIRST LSBFIRST
+typedef BitOrder BusIOBitOrder;
+#endif
+
+#if defined(__IMXRT1062__) // Teensy 4.x
+// *Warning* I disabled the usage of FAST_PINIO as the set/clear operations
+// used in the cpp file are not atomic and can effect multiple IO pins
+// and if an interrupt happens in between the time the code reads the register
+//  and writes out the updated value, that changes one or more other IO pins
+// on that same IO port, those change will be clobbered when the updated
+// values are written back.  A fast version can be implemented that uses the
+// ports set and clear registers which are atomic.
+// typedef volatile uint32_t BusIO_PortReg;
+// typedef uint32_t BusIO_PortMask;
+//#define BUSIO_USE_FAST_PINIO
+
+#elif defined(__AVR__) || defined(TEENSYDUINO)
+typedef volatile uint8_t BusIO_PortReg;
+typedef uint8_t BusIO_PortMask;
+#define BUSIO_USE_FAST_PINIO
+
+#elif defined(ESP8266) || defined(ESP32) || defined(__SAM3X8E__) ||            \
+    defined(ARDUINO_ARCH_SAMD)
+typedef volatile uint32_t BusIO_PortReg;
+typedef uint32_t BusIO_PortMask;
+#define BUSIO_USE_FAST_PINIO
+
+#elif (defined(__arm__) || defined(ARDUINO_FEATHER52)) &&                      \
+    !defined(ARDUINO_ARCH_MBED) && !defined(ARDUINO_ARCH_RP2040)
+typedef volatile uint32_t BusIO_PortReg;
+typedef uint32_t BusIO_PortMask;
+#if !defined(__ASR6501__) && !defined(__ASR6502__)
+#define BUSIO_USE_FAST_PINIO
+#endif
+
+#else
+#undef BUSIO_USE_FAST_PINIO
+#endif
+
+/**! The class which defines how we will talk to this device over SPI **/
+class Adafruit_SPIDevice {
+public:
+#ifdef BUSIO_HAS_HW_SPI
+  Adafruit_SPIDevice(int8_t cspin, uint32_t freq = 1000000,
+                     BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
+                     uint8_t dataMode = SPI_MODE0, SPIClass *theSPI = &SPI);
+#else
+  Adafruit_SPIDevice(int8_t cspin, uint32_t freq = 1000000,
+                     BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
+                     uint8_t dataMode = SPI_MODE0, SPIClass *theSPI = nullptr);
+#endif
+  Adafruit_SPIDevice(int8_t cspin, int8_t sck, int8_t miso, int8_t mosi,
+                     uint32_t freq = 1000000,
+                     BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
+                     uint8_t dataMode = SPI_MODE0);
+  ~Adafruit_SPIDevice();
+
+  bool begin(void);
+  bool read(uint8_t *buffer, size_t len, uint8_t sendvalue = 0xFF);
+  bool write(const uint8_t *buffer, size_t len,
+             const uint8_t *prefix_buffer = nullptr, size_t prefix_len = 0);
+  bool write_then_read(const uint8_t *write_buffer, size_t write_len,
+                       uint8_t *read_buffer, size_t read_len,
+                       uint8_t sendvalue = 0xFF);
+  bool write_and_read(uint8_t *buffer, size_t len);
+
+  uint8_t transfer(uint8_t send);
+  void transfer(uint8_t *buffer, size_t len);
+  void beginTransaction(void);
+  void endTransaction(void);
+  void beginTransactionWithAssertingCS();
+  void endTransactionWithDeassertingCS();
+
+private:
+#ifdef BUSIO_HAS_HW_SPI
+  SPIClass *_spi = nullptr;
+  SPISettings *_spiSetting = nullptr;
+#else
+  uint8_t *_spi = nullptr;
+  uint8_t *_spiSetting = nullptr;
+#endif
+  uint32_t _freq;
+  BusIOBitOrder _dataOrder;
+  uint8_t _dataMode;
+  void setChipSelect(int value);
+
+  int8_t _cs, _sck, _mosi, _miso;
+#ifdef BUSIO_USE_FAST_PINIO
+  BusIO_PortReg *mosiPort, *clkPort, *misoPort, *csPort;
+  BusIO_PortMask mosiPinMask, misoPinMask, clkPinMask, csPinMask;
+#endif
+  bool _begun;
+};
+
+#endif // Adafruit_SPIDevice_h

lib/Adafruit_BusIO/CMakeLists.txt

@@ -0,0 +1,11 @@
+# Adafruit Bus IO Library
+# https://github.com/adafruit/Adafruit_BusIO
+# MIT License
+
+cmake_minimum_required(VERSION 3.5)
+
+idf_component_register(SRCS "Adafruit_I2CDevice.cpp" "Adafruit_BusIO_Register.cpp" "Adafruit_SPIDevice.cpp" 
+                       INCLUDE_DIRS "."
+                       REQUIRES arduino)
+
+project(Adafruit_BusIO)

lib/Adafruit_BusIO/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 Adafruit Industries
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

lib/Adafruit_BusIO/README.md

@@ -0,0 +1,8 @@
+# Adafruit Bus IO Library [![Build Status](https://github.com/adafruit/Adafruit_BusIO/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_BusIO/actions)
+
+
+This is a helper library to abstract away I2C & SPI transactions and registers
+
+Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
+
+MIT license, all text above must be included in any redistribution

lib/Adafruit_BusIO/component.mk

@@ -0,0 +1 @@
+COMPONENT_ADD_INCLUDEDIRS = .

lib/Adafruit_BusIO/examples/i2c_address_detect/i2c_address_detect.ino

@@ -0,0 +1,21 @@
+#include <Adafruit_I2CDevice.h>
+
+Adafruit_I2CDevice i2c_dev = Adafruit_I2CDevice(0x10);
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C address detection test");
+
+  if (!i2c_dev.begin()) {
+    Serial.print("Did not find device at 0x");
+    Serial.println(i2c_dev.address(), HEX);
+    while (1);
+  }
+  Serial.print("Device found on address 0x");
+  Serial.println(i2c_dev.address(), HEX);
+}
+
+void loop() {
+  
+}

lib/Adafruit_BusIO/examples/i2c_readwrite/i2c_readwrite.ino

@@ -0,0 +1,41 @@
+#include <Adafruit_I2CDevice.h>
+
+#define I2C_ADDRESS 0x60
+Adafruit_I2CDevice i2c_dev = Adafruit_I2CDevice(I2C_ADDRESS);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C device read and write test");
+
+  if (!i2c_dev.begin()) {
+    Serial.print("Did not find device at 0x");
+    Serial.println(i2c_dev.address(), HEX);
+    while (1);
+  }
+  Serial.print("Device found on address 0x");
+  Serial.println(i2c_dev.address(), HEX);
+
+  uint8_t buffer[32];
+  // Try to read 32 bytes
+  i2c_dev.read(buffer, 32);
+  Serial.print("Read: ");
+  for (uint8_t i=0; i<32; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+
+  // read a register by writing first, then reading
+  buffer[0] = 0x0C;  // we'll reuse the same buffer
+  i2c_dev.write_then_read(buffer, 1, buffer, 2, false);
+  Serial.print("Write then Read: ");
+  for (uint8_t i=0; i<2; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+}
+
+void loop() {
+  
+}

lib/Adafruit_BusIO/examples/i2c_registers/i2c_registers.ino

@@ -0,0 +1,38 @@
+#include <Adafruit_I2CDevice.h>
+#include <Adafruit_BusIO_Register.h>
+
+#define I2C_ADDRESS 0x60
+Adafruit_I2CDevice i2c_dev = Adafruit_I2CDevice(I2C_ADDRESS);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C device register test");
+
+  if (!i2c_dev.begin()) {
+    Serial.print("Did not find device at 0x");
+    Serial.println(i2c_dev.address(), HEX);
+    while (1);
+  }
+  Serial.print("Device found on address 0x");
+  Serial.println(i2c_dev.address(), HEX);
+
+  Adafruit_BusIO_Register id_reg = Adafruit_BusIO_Register(&i2c_dev, 0x0C, 2, LSBFIRST);
+  uint16_t id;
+  id_reg.read(&id);
+  Serial.print("ID register = 0x"); Serial.println(id, HEX);
+
+  Adafruit_BusIO_Register thresh_reg = Adafruit_BusIO_Register(&i2c_dev, 0x01, 2, LSBFIRST);
+  uint16_t thresh;
+  thresh_reg.read(&thresh);
+  Serial.print("Initial threshold register = 0x"); Serial.println(thresh, HEX);
+
+  thresh_reg.write(~thresh);
+
+  Serial.print("Post threshold register = 0x"); Serial.println(thresh_reg.read(), HEX);
+}
+
+void loop() {
+  
+}

lib/Adafruit_BusIO/examples/i2corspi_register/i2corspi_register.ino

@@ -0,0 +1,38 @@
+#include <Adafruit_BusIO_Register.h>
+
+// Define which interface to use by setting the unused interface to NULL!
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice *spi_dev = NULL; // new Adafruit_SPIDevice(SPIDEVICE_CS);
+
+#define I2C_ADDRESS 0x5D
+Adafruit_I2CDevice *i2c_dev = new Adafruit_I2CDevice(I2C_ADDRESS);
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C or SPI device register test");
+
+  if (spi_dev && !spi_dev->begin()) {
+    Serial.println("Could not initialize SPI device");
+  }
+
+  if (i2c_dev) {
+    if (i2c_dev->begin()) {
+      Serial.print("Device found on I2C address 0x");
+      Serial.println(i2c_dev->address(), HEX);
+    } else {
+      Serial.print("Did not find I2C device at 0x");
+      Serial.println(i2c_dev->address(), HEX);
+    }
+  }
+
+  Adafruit_BusIO_Register id_reg = Adafruit_BusIO_Register(i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, 0x0F);
+  uint8_t id=0;
+  id_reg.read(&id);
+  Serial.print("ID register = 0x"); Serial.println(id, HEX);
+}
+
+void loop() {
+  
+}

lib/Adafruit_BusIO/examples/spi_modetest/spi_modetest.ino

@@ -0,0 +1,29 @@
+#include <Adafruit_SPIDevice.h>
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS, 100000, SPI_BITORDER_MSBFIRST, SPI_MODE1);
+//Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS, 13, 12, 11, 100000, SPI_BITORDER_MSBFIRST, SPI_MODE1);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI device mode test");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+}
+
+void loop() {
+  Serial.println("\n\nTransfer test");
+  for (uint16_t x=0; x<=0xFF; x++) {
+    uint8_t i = x;   
+    Serial.print("0x"); Serial.print(i, HEX); 
+    spi_dev.read(&i, 1, i);
+    Serial.print("/"); Serial.print(i, HEX);
+    Serial.print(", ");
+    delay(25);
+  }
+}

lib/Adafruit_BusIO/examples/spi_readwrite/spi_readwrite.ino

@@ -0,0 +1,39 @@
+#include <Adafruit_SPIDevice.h>
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI device read and write test");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+
+  uint8_t buffer[32];
+
+  // Try to read 32 bytes
+  spi_dev.read(buffer, 32);
+  Serial.print("Read: ");
+  for (uint8_t i=0; i<32; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+
+  // read a register by writing first, then reading
+  buffer[0] = 0x8F;  // we'll reuse the same buffer
+  spi_dev.write_then_read(buffer, 1, buffer, 2, false);
+  Serial.print("Write then Read: ");
+  for (uint8_t i=0; i<2; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+}
+
+void loop() {
+  
+}

lib/Adafruit_BusIO/examples/spi_register_bits/spi_register_bits.ino

@@ -0,0 +1,192 @@
+/*************************************************** 
+
+  This is an example for how to use Adafruit_BusIO_RegisterBits from Adafruit_BusIO library.
+
+  Designed specifically to work with the Adafruit RTD Sensor
+  ----> https://www.adafruit.com/products/3328
+  uisng a MAX31865 RTD-to-Digital Converter
+  ----> https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf
+
+  This sensor uses SPI to communicate, 4 pins are required to  
+  interface.
+  A fifth pin helps to detect when a new conversion is ready.
+
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Example written (2020/3) by Andreas Hardtung/AnHard.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include <Adafruit_BusIO_Register.h>
+#include <Adafruit_SPIDevice.h>
+
+#define MAX31865_SPI_SPEED    (5000000)
+#define MAX31865_SPI_BITORDER (SPI_BITORDER_MSBFIRST)
+#define MAX31865_SPI_MODE     (SPI_MODE1)
+
+#define MAX31865_SPI_CS       (10)
+#define MAX31865_READY_PIN    (2)
+
+
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice( MAX31865_SPI_CS, MAX31865_SPI_SPEED, MAX31865_SPI_BITORDER, MAX31865_SPI_MODE, &SPI); // Hardware SPI
+// Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice( MAX31865_SPI_CS, 13, 12, 11, MAX31865_SPI_SPEED, MAX31865_SPI_BITORDER, MAX31865_SPI_MODE); // Software SPI
+
+// MAX31865 chip related *********************************************************************************************
+Adafruit_BusIO_Register     config_reg  = Adafruit_BusIO_Register(&spi_dev, 0x00, ADDRBIT8_HIGH_TOWRITE, 1, MSBFIRST);
+Adafruit_BusIO_RegisterBits   bias_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 7);
+Adafruit_BusIO_RegisterBits   auto_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 6);
+Adafruit_BusIO_RegisterBits   oneS_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 5);
+Adafruit_BusIO_RegisterBits   wire_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 4);
+Adafruit_BusIO_RegisterBits faultT_bits = Adafruit_BusIO_RegisterBits(&config_reg, 2, 2);
+Adafruit_BusIO_RegisterBits faultR_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 1);
+Adafruit_BusIO_RegisterBits fi50hz_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 0);
+
+Adafruit_BusIO_Register     rRatio_reg  = Adafruit_BusIO_Register(&spi_dev, 0x01, ADDRBIT8_HIGH_TOWRITE, 2, MSBFIRST);
+Adafruit_BusIO_RegisterBits rRatio_bits = Adafruit_BusIO_RegisterBits(&rRatio_reg, 15, 1);
+Adafruit_BusIO_RegisterBits  fault_bit  = Adafruit_BusIO_RegisterBits(&rRatio_reg,  1, 0);
+
+Adafruit_BusIO_Register      maxRratio_reg = Adafruit_BusIO_Register(&spi_dev, 0x03, ADDRBIT8_HIGH_TOWRITE, 2, MSBFIRST);
+Adafruit_BusIO_RegisterBits maxRratio_bits = Adafruit_BusIO_RegisterBits(&maxRratio_reg, 15, 1);
+
+Adafruit_BusIO_Register      minRratio_reg = Adafruit_BusIO_Register(&spi_dev, 0x05, ADDRBIT8_HIGH_TOWRITE, 2, MSBFIRST);
+Adafruit_BusIO_RegisterBits minRratio_bits = Adafruit_BusIO_RegisterBits(&minRratio_reg, 15, 1);
+
+Adafruit_BusIO_Register                fault_reg = Adafruit_BusIO_Register(&spi_dev, 0x07, ADDRBIT8_HIGH_TOWRITE, 1, MSBFIRST);
+Adafruit_BusIO_RegisterBits range_high_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 7);
+Adafruit_BusIO_RegisterBits  range_low_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 6);
+Adafruit_BusIO_RegisterBits refin_high_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 5);
+Adafruit_BusIO_RegisterBits  refin_low_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 4);
+Adafruit_BusIO_RegisterBits  rtdin_low_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 3);
+Adafruit_BusIO_RegisterBits    voltage_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 2);
+
+// Print the details of the configuration register.
+void printConfig( void ) {
+  Serial.print("BIAS: ");         if (bias_bit.read() )   Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", AUTO: ");       if (auto_bit.read() )   Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", ONES: ");       if (oneS_bit.read() )   Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", WIRE: ");       if (wire_bit.read() )   Serial.print("3");    else Serial.print("2/4");
+  Serial.print(", FAULTCLEAR: "); if (faultR_bit.read() ) Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", ");             if (fi50hz_bit.read() ) Serial.print("50HZ"); else Serial.print("60HZ");
+  Serial.println();
+}
+
+// Check and print faults. Then clear them.
+void checkFaults( void ) {
+  if (fault_bit.read()) {
+    Serial.print("MAX: "); Serial.println(maxRratio_bits.read());
+    Serial.print("VAL: "); Serial.println(   rRatio_bits.read());
+    Serial.print("MIN: "); Serial.println(minRratio_bits.read());
+
+    if (range_high_fault_bit.read() ) Serial.println("Range high fault");
+    if ( range_low_fault_bit.read() ) Serial.println("Range low fault");
+    if (refin_high_fault_bit.read() ) Serial.println("REFIN high fault");
+    if ( refin_low_fault_bit.read() ) Serial.println("REFIN low fault");
+    if ( rtdin_low_fault_bit.read() ) Serial.println("RTDIN low fault");
+    if (   voltage_fault_bit.read() ) Serial.println("Voltage fault");
+
+    faultR_bit.write(1); // clear fault
+  }
+}
+
+void setup() {
+  #if (MAX31865_1_READY_PIN != -1)
+    pinMode(MAX31865_READY_PIN ,INPUT_PULLUP);
+  #endif
+
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI Adafruit_BusIO_RegisterBits test on MAX31865");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+
+  // Set up for automode 50Hz. We don't care about selfheating. We want the highest possible sampling rate.
+  auto_bit.write(0);   // Don't switch filtermode while auto_mode is on.
+  fi50hz_bit.write(1); // Set filter to 50Hz mode.
+  faultR_bit.write(1); // Clear faults.
+  bias_bit.write(1);   // In automode we want to have the bias current always on.
+  delay(5);            // Wait until bias current settles down.
+                       // 10.5 time constants of the input RC network is required.
+                       // 10ms worst case for 10kω reference resistor and a 0.1µF capacitor across the RTD inputs.
+                       // Adafruit Module has 0.1µF and only 430/4300ω So here 0.43/4.3ms
+  auto_bit.write(1);   // Now we can set automode. Automatically starting first conversion.
+
+  // Test the READY_PIN
+  #if (defined( MAX31865_READY_PIN ) && (MAX31865_READY_PIN != -1))
+    int i = 0;
+    while (digitalRead(MAX31865_READY_PIN) && i++ <= 100) { delay(1); }
+    if (i >= 100) {
+      Serial.print("ERROR: Max31865 Pin detection does not work. PIN:");
+      Serial.println(MAX31865_READY_PIN);
+    }
+  #else
+    delay(100);
+  #endif
+
+  // Set ratio range.
+  // Setting the temperatures would need some more calculation - not related to Adafruit_BusIO_RegisterBits.
+  uint16_t ratio = rRatio_bits.read();
+  maxRratio_bits.write( (ratio < 0x8fffu-1000u) ? ratio + 1000u : 0x8fffu ); 
+  minRratio_bits.write( (ratio >         1000u) ? ratio - 1000u : 0u      );
+
+  printConfig();
+  checkFaults();
+}
+
+void loop() {
+  #if (defined( MAX31865_READY_PIN ) && (MAX31865_1_READY_PIN != -1))
+    // Is conversion ready?
+    if (!digitalRead(MAX31865_READY_PIN))
+  #else
+    // Warant conversion is ready.
+    delay(21); // 21ms for 50Hz-mode. 19ms in 60Hz-mode.
+  #endif
+    {
+      // Read ratio, calculate temperature, scale, filter and print.
+      Serial.println( rRatio2C( rRatio_bits.read() ) * 100.0f, 0); // Temperature scaled by 100
+      // Check, print, clear faults.
+      checkFaults();
+    }
+
+  // Do something else.
+  //delay(15000);
+}
+
+
+// Module/Sensor related. Here Adafruit PT100 module with a 2_Wire PT100 Class C *****************************
+float rRatio2C(uint16_t ratio) {
+  // A simple linear conversion.
+  const float R0 = 100.0f;
+  const float Rref = 430.0f;
+  const float alphaPT = 0.003850f;
+  const float ADCmax = (1u << 15) - 1.0f;
+  const float rscale = Rref / ADCmax;
+  // Measured temperature in boiling water 101.08°C with factor a = 1 and b = 0. Rref and MAX at about 22±2°C.
+  // Measured temperature in ice/water bath 0.76°C with factor a = 1 and b = 0. Rref and MAX at about 22±2°C.
+  //const float a = 1.0f / (alphaPT * R0);
+  const float a = (100.0f/101.08f) / (alphaPT * R0);
+  //const float b = 0.0f;  // 101.08
+  const float b = -0.76f;  // 100.32 > 101.08
+
+  return filterRing( ((ratio * rscale) - R0) * a + b );
+}
+
+// General purpose *********************************************************************************************
+#define RINGLENGTH 250
+float filterRing( float newVal ) {
+  static float ring[RINGLENGTH] = { 0.0 };
+  static uint8_t ringIndex = 0;
+  static bool ringFull = false;
+
+  if ( ringIndex == RINGLENGTH ) { ringFull = true; ringIndex = 0; }
+  ring[ringIndex] = newVal;
+  uint8_t loopEnd = (ringFull) ? RINGLENGTH : ringIndex + 1;
+  float ringSum = 0.0f;
+  for (uint8_t i = 0;  i < loopEnd; i++) ringSum += ring[i];
+  ringIndex++;
+  return ringSum / loopEnd;
+}

lib/Adafruit_BusIO/examples/spi_registers/spi_registers.ino

@@ -0,0 +1,34 @@
+#include <Adafruit_BusIO_Register.h>
+#include <Adafruit_SPIDevice.h>
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS);
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI device register test");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+
+  Adafruit_BusIO_Register id_reg = Adafruit_BusIO_Register(&spi_dev, 0x0F, ADDRBIT8_HIGH_TOREAD);
+  uint8_t id = 0;
+  id_reg.read(&id);
+  Serial.print("ID register = 0x"); Serial.println(id, HEX);
+
+  Adafruit_BusIO_Register thresh_reg = Adafruit_BusIO_Register(&spi_dev, 0x0C, ADDRBIT8_HIGH_TOREAD, 2, LSBFIRST);
+  uint16_t thresh = 0;
+  thresh_reg.read(&thresh);
+  Serial.print("Initial threshold register = 0x"); Serial.println(thresh, HEX);
+
+  thresh_reg.write(~thresh);
+
+  Serial.print("Post threshold register = 0x"); Serial.println(thresh_reg.read(), HEX);
+}
+
+void loop() {
+  
+}

lib/Adafruit_BusIO/library.properties

@@ -0,0 +1,9 @@
+name=Adafruit BusIO
+version=1.14.1
+author=Adafruit
+maintainer=Adafruit <info@adafruit.com>
+sentence=This is a library for abstracting away UART, I2C and SPI interfacing
+paragraph=This is a library for abstracting away UART, I2C and SPI interfacing
+category=Signal Input/Output
+url=https://github.com/adafruit/Adafruit_BusIO
+architectures=*

lib/Adafruit_Sensor/.gitignore

@@ -0,0 +1,108 @@
+#
+# NOTE! Don't add files that are generated in specific
+# subdirectories here. Add them in the ".gitignore" file
+# in that subdirectory instead.
+#
+# NOTE! Please use 'git ls-files -i --exclude-standard'
+# command after changing this file, to see if there are
+# any tracked files which get ignored after the change.
+#
+# Normal rules
+#
+.*
+*.o
+*.o.*
+*.a
+*.s
+*.ko
+*.so
+*.so.dbg
+*.mod.c
+*.i
+*.lst
+*.symtypes
+*.order
+modules.builtin
+*.elf
+*.bin
+*.gz
+*.bz2
+*.lzma
+*.patch
+*.gcno
+
+#
+# Top-level generic files
+#
+/tags
+/TAGS
+/linux
+/vmlinux
+/vmlinuz
+/System.map
+/Module.markers
+/Module.symvers
+
+#
+# git files that we don't want to ignore even it they are dot-files
+#
+!.gitignore
+!.mailmap
+
+#
+# Generated include files
+#
+include/config
+include/linux/version.h
+include/generated
+
+# stgit generated dirs
+patches-*
+
+# quilt's files
+patches
+series
+
+# cscope files
+cscope.*
+ncscope.*
+
+# gnu global files
+GPATH
+GRTAGS
+GSYMS
+GTAGS
+
+# QT-Creator files
+Makefile.am.user
+*.config
+*.creator
+*.creator.user
+*.files
+*.includes
+
+*.orig
+*~
+\#*#
+*.lo
+*.la
+Makefile
+Makefile.in
+aclocal.m4
+autoconfig.h
+autoconfig.h.in
+autom4te.cache/
+build-aux/
+config.log
+config.status
+configure
+libtool
+libupnp.pc
+m4/libtool.m4
+m4/ltoptions.m4
+m4/ltsugar.m4
+m4/ltversion.m4
+m4/lt~obsolete.m4
+stamp-h1
+docs/doxygen
+

lib/Adafruit_Sensor/Adafruit_Sensor.cpp

@@ -0,0 +1,87 @@
+#include "Adafruit_Sensor.h"
+
+/**************************************************************************/
+/*!
+    @brief  Prints sensor information to serial console
+*/
+/**************************************************************************/
+void Adafruit_Sensor::printSensorDetails(void) {
+  sensor_t sensor;
+  getSensor(&sensor);
+  Serial.println(F("------------------------------------"));
+  Serial.print(F("Sensor:       "));
+  Serial.println(sensor.name);
+  Serial.print(F("Type:         "));
+  switch ((sensors_type_t)sensor.type) {
+  case SENSOR_TYPE_ACCELEROMETER:
+    Serial.print(F("Acceleration (m/s2)"));
+    break;
+  case SENSOR_TYPE_MAGNETIC_FIELD:
+    Serial.print(F("Magnetic (uT)"));
+    break;
+  case SENSOR_TYPE_ORIENTATION:
+    Serial.print(F("Orientation (degrees)"));
+    break;
+  case SENSOR_TYPE_GYROSCOPE:
+    Serial.print(F("Gyroscopic (rad/s)"));
+    break;
+  case SENSOR_TYPE_LIGHT:
+    Serial.print(F("Light (lux)"));
+    break;
+  case SENSOR_TYPE_PRESSURE:
+    Serial.print(F("Pressure (hPa)"));
+    break;
+  case SENSOR_TYPE_PROXIMITY:
+    Serial.print(F("Distance (cm)"));
+    break;
+  case SENSOR_TYPE_GRAVITY:
+    Serial.print(F("Gravity (m/s2)"));
+    break;
+  case SENSOR_TYPE_LINEAR_ACCELERATION:
+    Serial.print(F("Linear Acceleration (m/s2)"));
+    break;
+  case SENSOR_TYPE_ROTATION_VECTOR:
+    Serial.print(F("Rotation vector"));
+    break;
+  case SENSOR_TYPE_RELATIVE_HUMIDITY:
+    Serial.print(F("Relative Humidity (%)"));
+    break;
+  case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+    Serial.print(F("Ambient Temp (C)"));
+    break;
+  case SENSOR_TYPE_OBJECT_TEMPERATURE:
+    Serial.print(F("Object Temp (C)"));
+    break;
+  case SENSOR_TYPE_VOLTAGE:
+    Serial.print(F("Voltage (V)"));
+    break;
+  case SENSOR_TYPE_CURRENT:
+    Serial.print(F("Current (mA)"));
+    break;
+  case SENSOR_TYPE_COLOR:
+    Serial.print(F("Color (RGBA)"));
+    break;
+  case SENSOR_TYPE_TVOC:
+    Serial.print(F("Total Volatile Organic Compounds (ppb)"));
+    break;
+  case SENSOR_TYPE_VOC_INDEX:
+    Serial.print(F("Volatile Organic Compounds (Index)"));
+    break;
+  case SENSOR_TYPE_NOX_INDEX:
+    Serial.print(F("Nitrogen Oxides (Index)"));
+    break;
+  }
+
+  Serial.println();
+  Serial.print(F("Driver Ver:   "));
+  Serial.println(sensor.version);
+  Serial.print(F("Unique ID:    "));
+  Serial.println(sensor.sensor_id);
+  Serial.print(F("Min Value:    "));
+  Serial.println(sensor.min_value);
+  Serial.print(F("Max Value:    "));
+  Serial.println(sensor.max_value);
+  Serial.print(F("Resolution:   "));
+  Serial.println(sensor.resolution);
+  Serial.println(F("------------------------------------\n"));
+}

lib/Adafruit_Sensor/Adafruit_Sensor.h

@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software< /span>
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Update by K. Townsend (Adafruit Industries) for lighter typedefs, and
+ * extended sensor support to include color, voltage and current */
+
+#ifndef _ADAFRUIT_SENSOR_H
+#define _ADAFRUIT_SENSOR_H
+
+#ifndef ARDUINO
+#include <stdint.h>
+#elif ARDUINO >= 100
+#include "Arduino.h"
+#include "Print.h"
+#else
+#include "WProgram.h"
+#endif
+
+/* Constants */
+#define SENSORS_GRAVITY_EARTH (9.80665F) /**< Earth's gravity in m/s^2 */
+#define SENSORS_GRAVITY_MOON (1.6F)      /**< The moon's gravity in m/s^2 */
+#define SENSORS_GRAVITY_SUN (275.0F)     /**< The sun's gravity in m/s^2 */
+#define SENSORS_GRAVITY_STANDARD (SENSORS_GRAVITY_EARTH)
+#define SENSORS_MAGFIELD_EARTH_MAX                                             \
+  (60.0F) /**< Maximum magnetic field on Earth's surface */
+#define SENSORS_MAGFIELD_EARTH_MIN                                             \
+  (30.0F) /**< Minimum magnetic field on Earth's surface */
+#define SENSORS_PRESSURE_SEALEVELHPA                                           \
+  (1013.25F) /**< Average sea level pressure is 1013.25 hPa */
+#define SENSORS_DPS_TO_RADS                                                    \
+  (0.017453293F) /**< Degrees/s to rad/s multiplier                            \
+                  */
+#define SENSORS_RADS_TO_DPS                                                    \
+  (57.29577793F) /**< Rad/s to degrees/s  multiplier */
+#define SENSORS_GAUSS_TO_MICROTESLA                                            \
+  (100) /**< Gauss to micro-Tesla multiplier */
+
+/** Sensor types */
+typedef enum {
+  SENSOR_TYPE_ACCELEROMETER = (1), /**< Gravity + linear acceleration */
+  SENSOR_TYPE_MAGNETIC_FIELD = (2),
+  SENSOR_TYPE_ORIENTATION = (3),
+  SENSOR_TYPE_GYROSCOPE = (4),
+  SENSOR_TYPE_LIGHT = (5),
+  SENSOR_TYPE_PRESSURE = (6),
+  SENSOR_TYPE_PROXIMITY = (8),
+  SENSOR_TYPE_GRAVITY = (9),
+  SENSOR_TYPE_LINEAR_ACCELERATION =
+      (10), /**< Acceleration not including gravity */
+  SENSOR_TYPE_ROTATION_VECTOR = (11),
+  SENSOR_TYPE_RELATIVE_HUMIDITY = (12),
+  SENSOR_TYPE_AMBIENT_TEMPERATURE = (13),
+  SENSOR_TYPE_OBJECT_TEMPERATURE = (14),
+  SENSOR_TYPE_VOLTAGE = (15),
+  SENSOR_TYPE_CURRENT = (16),
+  SENSOR_TYPE_COLOR = (17),
+  SENSOR_TYPE_TVOC = (18),
+  SENSOR_TYPE_VOC_INDEX = (19),
+  SENSOR_TYPE_NOX_INDEX = (20)
+} sensors_type_t;
+
+/** struct sensors_vec_s is used to return a vector in a common format. */
+typedef struct {
+  union {
+    float v[3]; ///< 3D vector elements
+    struct {
+      float x; ///< X component of vector
+      float y; ///< Y component of vector
+      float z; ///< Z component of vector
+    };         ///< Struct for holding XYZ component
+    /* Orientation sensors */
+    struct {
+      float roll; /**< Rotation around the longitudinal axis (the plane body, 'X
+                     axis'). Roll is positive and increasing when moving
+                     downward. -90 degrees <= roll <= 90 degrees */
+      float pitch;   /**< Rotation around the lateral axis (the wing span, 'Y
+                        axis'). Pitch is positive and increasing when moving
+                        upwards. -180 degrees <= pitch <= 180 degrees) */
+      float heading; /**< Angle between the longitudinal axis (the plane body)
+                        and magnetic north, measured clockwise when viewing from
+                        the top of the device. 0-359 degrees */
+    };               ///< Struct for holding roll/pitch/heading
+  };                 ///< Union that can hold 3D vector array, XYZ components or
+                     ///< roll/pitch/heading
+  int8_t status;     ///< Status byte
+  uint8_t reserved[3]; ///< Reserved
+} sensors_vec_t;
+
+/** struct sensors_color_s is used to return color data in a common format. */
+typedef struct {
+  union {
+    float c[3]; ///< Raw 3-element data
+    /* RGB color space */
+    struct {
+      float r;   /**< Red component */
+      float g;   /**< Green component */
+      float b;   /**< Blue component */
+    };           ///< RGB data in floating point notation
+  };             ///< Union of various ways to describe RGB colorspace
+  uint32_t rgba; /**< 24-bit RGBA value */
+} sensors_color_t;
+
+/* Sensor event (36 bytes) */
+/** struct sensor_event_s is used to provide a single sensor event in a common
+ * format. */
+typedef struct {
+  int32_t version;   /**< must be sizeof(struct sensors_event_t) */
+  int32_t sensor_id; /**< unique sensor identifier */
+  int32_t type;      /**< sensor type */
+  int32_t reserved0; /**< reserved */
+  int32_t timestamp; /**< time is in milliseconds */
+  union {
+    float data[4];              ///< Raw data
+    sensors_vec_t acceleration; /**< acceleration values are in meter per second
+                                   per second (m/s^2) */
+    sensors_vec_t
+        magnetic; /**< magnetic vector values are in micro-Tesla (uT) */
+    sensors_vec_t orientation; /**< orientation values are in degrees */
+    sensors_vec_t gyro;        /**< gyroscope values are in rad/s */
+    float temperature; /**< temperature is in degrees centigrade (Celsius) */
+    float distance;    /**< distance in centimeters */
+    float light;       /**< light in SI lux units */
+    float pressure;    /**< pressure in hectopascal (hPa) */
+    float relative_humidity; /**< relative humidity in percent */
+    float current;           /**< current in milliamps (mA) */
+    float voltage;           /**< voltage in volts (V) */
+    float tvoc;              /**< Total Volatile Organic Compounds, in ppb */
+    float voc_index; /**< VOC (Volatile Organic Compound) index where 100 is
+                          normal (unitless) */
+    float nox_index; /**< NOx (Nitrogen Oxides) index where 100 is normal
+                          (unitless) */
+    sensors_color_t color; /**< color in RGB component values */
+  };                       ///< Union for the wide ranges of data we can carry
+} sensors_event_t;
+
+/* Sensor details (40 bytes) */
+/** struct sensor_s is used to describe basic information about a specific
+ * sensor. */
+typedef struct {
+  char name[12];     /**< sensor name */
+  int32_t version;   /**< version of the hardware + driver */
+  int32_t sensor_id; /**< unique sensor identifier */
+  int32_t type;      /**< this sensor's type (ex. SENSOR_TYPE_LIGHT) */
+  float max_value;   /**< maximum value of this sensor's value in SI units */
+  float min_value;   /**< minimum value of this sensor's value in SI units */
+  float resolution; /**< smallest difference between two values reported by this
+                       sensor */
+  int32_t min_delay; /**< min delay in microseconds between events. zero = not a
+                        constant rate */
+} sensor_t;
+
+/** @brief Common sensor interface to unify various sensors.
+ * Intentionally modeled after sensors.h in the Android API:
+ * https://github.com/android/platform_hardware_libhardware/blob/master/include/hardware/sensors.h
+ */
+class Adafruit_Sensor {
+public:
+  // Constructor(s)
+  Adafruit_Sensor() {}
+  virtual ~Adafruit_Sensor() {}
+
+  // These must be defined by the subclass
+
+  /*! @brief Whether we should automatically change the range (if possible) for
+     higher precision
+      @param enabled True if we will try to autorange */
+  virtual void enableAutoRange(bool enabled) {
+    (void)enabled; /* suppress unused warning */
+  };
+
+  /*! @brief Get the latest sensor event
+      @returns True if able to fetch an event */
+  virtual bool getEvent(sensors_event_t *) = 0;
+  /*! @brief Get info about the sensor itself */
+  virtual void getSensor(sensor_t *) = 0;
+
+  void printSensorDetails(void);
+
+private:
+  bool _autoRange;
+};
+
+#endif

lib/Adafruit_Sensor/LICENSE.txt

@@ -0,0 +1,202 @@
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lib/Adafruit_Sensor/README.md

@@ -0,0 +1,239 @@
+# Adafruit Unified Sensor Driver #
+
+Many small embedded systems exist to collect data from sensors, analyse the data, and either take an appropriate action or send that sensor data to another system for processing.
+
+One of the many challenges of embedded systems design is the fact that parts you used today may be out of production tomorrow, or system requirements may change and you may need to choose a different sensor down the road.
+
+Creating new drivers is a relatively easy task, but integrating them into existing systems is both error prone and time consuming since sensors rarely use the exact same units of measurement.
+
+By reducing all data to a single **sensors\_event\_t** 'type' and settling on specific, **standardised SI units** for each sensor family the same sensor types return values that are comparable with any other similar sensor.  This enables you to switch sensor models with very little impact on the rest of the system, which can help mitigate some of the risks and problems of sensor availability and code reuse.
+
+The unified sensor abstraction layer is also useful for data-logging and data-transmission since you only have one well-known type to log or transmit over the air or wire.
+
+## Unified Sensor Drivers ##
+
+The following drivers are based on the Adafruit Unified Sensor Driver:
+
+**Accelerometers**
+  - [Adafruit\_ADXL345](https://github.com/adafruit/Adafruit_ADXL345)
+  - [Adafruit\_LSM303DLHC](https://github.com/adafruit/Adafruit_LSM303DLHC)
+  - [Adafruit\_MMA8451\_Library](https://github.com/adafruit/Adafruit_MMA8451_Library)
+
+**Gyroscope**
+  - [Adafruit\_L3GD20\_U](https://github.com/adafruit/Adafruit_L3GD20_U)
+
+**Light**
+  - [Adafruit\_TSL2561](https://github.com/adafruit/Adafruit_TSL2561)
+  - [Adafruit\_TSL2591\_Library](https://github.com/adafruit/Adafruit_TSL2591_Library)
+
+**Magnetometers**
+  - [Adafruit\_LSM303DLHC](https://github.com/adafruit/Adafruit_LSM303DLHC)
+  - [Adafruit\_HMC5883\_Unified](https://github.com/adafruit/Adafruit_HMC5883_Unified)
+  
+**Barometric Pressure**
+  - [Adafruit\_BMP085\_Unified](https://github.com/adafruit/Adafruit_BMP085_Unified)
+  - [Adafruit\_BMP183\_Unified\_Library](https://github.com/adafruit/Adafruit_BMP183_Unified_Library)
+
+**Humidity & Temperature**
+  - [DHT-sensor-library](https://github.com/adafruit/DHT-sensor-library)
+
+**Humidity, Temperature, & Barometric Pressure**
+  - [Adafruit_BME280_Library](https://github.com/adafruit/Adafruit_BME280_Library/)
+
+**Orientation**
+ - [Adafruit_BNO055](https://github.com/adafruit/Adafruit_BNO055)
+
+**All in one device**
+- [Adafruit_LSM9DS0](https://github.com/adafruit/Adafruit_LSM9DS0_Library) (accelerometer, gyroscope, magnetometer)
+- [Adafruit_LSM9DS1](https://github.com/adafruit/Adafruit_LSM9DS1/) (accelerometer, gyroscope, magnetometer)
+
+
+## How Does it Work? ##
+
+Any driver that supports the Adafruit unified sensor abstraction layer will implement the Adafruit\_Sensor base class.  There are two main typedefs and one enum defined in Adafruit_Sensor.h that are used to 'abstract' away the sensor details and values:
+
+## Sensor Types (`sensors_type_t`)
+
+These pre-defined sensor types are used to properly handle the two related typedefs below, and allows us determine what types of units the sensor uses, etc.
+
+```c++
+/** Sensor types */
+typedef enum
+{
+  SENSOR_TYPE_ACCELEROMETER         = (1),
+  SENSOR_TYPE_MAGNETIC_FIELD        = (2),
+  SENSOR_TYPE_ORIENTATION           = (3),
+  SENSOR_TYPE_GYROSCOPE             = (4),
+  SENSOR_TYPE_LIGHT                 = (5),
+  SENSOR_TYPE_PRESSURE              = (6),
+  SENSOR_TYPE_PROXIMITY             = (8),
+  SENSOR_TYPE_GRAVITY               = (9),
+  SENSOR_TYPE_LINEAR_ACCELERATION   = (10),
+  SENSOR_TYPE_ROTATION_VECTOR       = (11),
+  SENSOR_TYPE_RELATIVE_HUMIDITY     = (12),
+  SENSOR_TYPE_AMBIENT_TEMPERATURE   = (13),
+  SENSOR_TYPE_VOLTAGE               = (15),
+  SENSOR_TYPE_CURRENT               = (16),
+  SENSOR_TYPE_COLOR                 = (17),
+  SENSOR_TYPE_TVOC                  = (18),
+  SENSOR_TYPE_VOC_INDEX             = (19),
+  SENSOR_TYPE_NOX_INDEX             = (20)
+} sensors_type_t;
+```
+
+## Sensor Details (`sensor_t`)
+
+This typedef describes the specific capabilities of this sensor, and allows us to know what sensor we are using beneath the abstraction layer.
+
+```c++
+/* Sensor details (40 bytes) */
+/** struct sensor_s is used to describe basic information about a specific sensor. */
+typedef struct
+{
+    char     name[12];
+    int32_t  version;
+    int32_t  sensor_id;
+    int32_t  type;
+    float    max_value;
+    float    min_value;
+    float    resolution;
+    int32_t  min_delay;
+} sensor_t;
+```
+
+The individual fields are intended to be used as follows:
+
+- **name**: The sensor name or ID, up to a maximum of twelve characters (ex. "MPL115A2")
+- **version**: The version of the sensor HW and the driver to allow us to differentiate versions of the board or driver
+- **sensor\_id**: A unique sensor identifier that is used to differentiate this specific sensor instance from any others that are present on the system or in the sensor network
+- **type**: The sensor type, based on **sensors\_type\_t** in sensors.h
+- **max\_value**: The maximum value that this sensor can return (in the appropriate SI unit)
+- **min\_value**: The minimum value that this sensor can return (in the appropriate SI unit)
+- **resolution**: The smallest difference between two values that this sensor can report (in the appropriate SI unit)
+- **min\_delay**: The minimum delay in microseconds between two sensor events, or '0' if there is no constant sensor rate
+
+## Sensor Data/Events (`sensors_event_t`)
+
+This typedef is used to return sensor data from any sensor supported by the abstraction layer, using standard SI units and scales.
+
+```c++
+/* Sensor event (36 bytes) */
+/** struct sensor_event_s is used to provide a single sensor event in a common format. */
+typedef struct
+{
+    int32_t version;
+    int32_t sensor_id;
+    int32_t type;
+    int32_t reserved0;
+    int32_t timestamp;
+    union
+    {
+        float           data[4];
+        sensors_vec_t   acceleration;
+        sensors_vec_t   magnetic;
+        sensors_vec_t   orientation;
+        sensors_vec_t   gyro;
+        float           temperature;
+        float           distance;
+        float           light;
+        float           pressure;
+        float           relative_humidity;
+        float           current;
+        float           voltage;
+        float           tvoc;
+        float           voc_index;
+        float           nox_index;
+        sensors_color_t color;
+    };
+} sensors_event_t;
+```
+It includes the following fields:
+
+- **version**: Contain 'sizeof(sensors\_event\_t)' to identify which version of the API we're using in case this changes in the future
+- **sensor\_id**: A unique sensor identifier that is used to differentiate this specific sensor instance from any others that are present on the system or in the sensor network (must match the sensor\_id value in the corresponding sensor\_t enum above!)
+- **type**: the sensor type, based on **sensors\_type\_t** in sensors.h
+- **timestamp**: time in milliseconds when the sensor value was read
+- **data[4]**: An array of four 32-bit values that allows us to encapsulate any type of sensor data via a simple union (further described below)
+
+## Required Functions
+
+In addition to the two standard types and the sensor type enum, all drivers based on Adafruit_Sensor must also implement the following two functions:
+
+```c++
+bool getEvent(sensors_event_t*);
+```
+Calling this function will populate the supplied sensors\_event\_t reference with the latest available sensor data.  You should call this function as often as you want to update your data.
+
+```c++
+void getSensor(sensor_t*);
+```
+Calling this function will provide some basic information about the sensor (the sensor name, driver version, min and max values, etc.
+
+## Standardised SI values for `sensors_event_t`
+
+A key part of the abstraction layer is the standardisation of values on SI units of a particular scale, which is accomplished via the data[4] union in sensors\_event\_t above.  This 16 byte union includes fields for each main sensor type, and uses the following SI units and scales:
+
+- **acceleration**: values are in **meter per second per second** (m/s^2)
+- **magnetic**: values are in **micro-Tesla** (uT)
+- **orientation**: values are in **degrees**
+- **gyro**: values are in **rad/s**
+- **temperature**: values in **degrees centigrade** (Celsius) 
+- **distance**: values are in **centimeters**
+- **light**: values are in **SI lux** units
+- **pressure**: values are in **hectopascal** (hPa)
+- **relative\_humidity**: values are in **percent**
+- **current**: values are in **milliamps** (mA)
+- **voltage**: values are in **volts** (V)
+- **color**: values are in 0..1.0 RGB channel luminosity and 32-bit RGBA format
+- **tvoc**: values are in **parts per billion** (ppb)
+- **voc_index**: values are an **index** from 1-500 with 100 being normal
+- **nox_index**: values are an **index** from 1-500 with 100 being normal
+
+
+## The Unified Driver Abstraction Layer in Practice ##
+
+Using the unified sensor abstraction layer is relatively easy once a compliant driver has been created.
+
+Every compliant sensor can now be read using a single, well-known 'type' (sensors\_event\_t), and there is a standardised way of interrogating a sensor about its specific capabilities (via sensor\_t).
+
+An example of reading the [TSL2561](https://github.com/adafruit/Adafruit_TSL2561) light sensor can be seen below:
+
+```c++
+ Adafruit_TSL2561 tsl = Adafruit_TSL2561(TSL2561_ADDR_FLOAT, 12345);
+ ...
+ /* Get a new sensor event */ 
+ sensors_event_t event;
+ tsl.getEvent(&event);
+ 
+ /* Display the results (light is measured in lux) */
+ if (event.light)
+ {
+   Serial.print(event.light); Serial.println(" lux");
+ }
+ else
+ {
+   /* If event.light = 0 lux the sensor is probably saturated
+      and no reliable data could be generated! */
+   Serial.println("Sensor overload");
+ }
+```
+
+Similarly, we can get the basic technical capabilities of this sensor with the following code:
+
+```c++
+ sensor_t sensor;
+ 
+ sensor_t sensor;
+ tsl.getSensor(&sensor);
+
+ /* Display the sensor details */
+ Serial.println("------------------------------------");
+ Serial.print  ("Sensor:       "); Serial.println(sensor.name);
+ Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
+ Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
+ Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" lux");
+ Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" lux");
+ Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" lux");  
+ Serial.println("------------------------------------");
+ Serial.println("");
+```

lib/Adafruit_Sensor/examples/sensortest/sensortest.ino

@@ -0,0 +1,153 @@
+#include <Wire.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_ADXL343.h>
+
+/* Assign a unique ID to this sensor at the same time */
+/* Uncomment following line for default Wire bus      */
+Adafruit_ADXL343 accel = Adafruit_ADXL343(12345);
+
+/* NeoTrellis M4, etc.                    */
+/* Uncomment following line for Wire1 bus */
+//Adafruit_ADXL343 accel = Adafruit_ADXL343(12345, &Wire1);
+
+void displaySensorDetails(void)
+{
+  sensor_t sensor;
+  accel.getSensor(&sensor);
+  Serial.println("------------------------------------");
+  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
+  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
+  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
+  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" m/s^2");
+  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" m/s^2");
+  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" m/s^2");
+  Serial.println("------------------------------------");
+  Serial.println("");
+  delay(500);
+}
+
+void displayDataRate(void)
+{
+  Serial.print  ("Data Rate:    ");
+
+  switch(accel.getDataRate())
+  {
+    case ADXL343_DATARATE_3200_HZ:
+      Serial.print  ("3200 ");
+      break;
+    case ADXL343_DATARATE_1600_HZ:
+      Serial.print  ("1600 ");
+      break;
+    case ADXL343_DATARATE_800_HZ:
+      Serial.print  ("800 ");
+      break;
+    case ADXL343_DATARATE_400_HZ:
+      Serial.print  ("400 ");
+      break;
+    case ADXL343_DATARATE_200_HZ:
+      Serial.print  ("200 ");
+      break;
+    case ADXL343_DATARATE_100_HZ:
+      Serial.print  ("100 ");
+      break;
+    case ADXL343_DATARATE_50_HZ:
+      Serial.print  ("50 ");
+      break;
+    case ADXL343_DATARATE_25_HZ:
+      Serial.print  ("25 ");
+      break;
+    case ADXL343_DATARATE_12_5_HZ:
+      Serial.print  ("12.5 ");
+      break;
+    case ADXL343_DATARATE_6_25HZ:
+      Serial.print  ("6.25 ");
+      break;
+    case ADXL343_DATARATE_3_13_HZ:
+      Serial.print  ("3.13 ");
+      break;
+    case ADXL343_DATARATE_1_56_HZ:
+      Serial.print  ("1.56 ");
+      break;
+    case ADXL343_DATARATE_0_78_HZ:
+      Serial.print  ("0.78 ");
+      break;
+    case ADXL343_DATARATE_0_39_HZ:
+      Serial.print  ("0.39 ");
+      break;
+    case ADXL343_DATARATE_0_20_HZ:
+      Serial.print  ("0.20 ");
+      break;
+    case ADXL343_DATARATE_0_10_HZ:
+      Serial.print  ("0.10 ");
+      break;
+    default:
+      Serial.print  ("???? ");
+      break;
+  }
+  Serial.println(" Hz");
+}
+
+void displayRange(void)
+{
+  Serial.print  ("Range:         +/- ");
+
+  switch(accel.getRange())
+  {
+    case ADXL343_RANGE_16_G:
+      Serial.print  ("16 ");
+      break;
+    case ADXL343_RANGE_8_G:
+      Serial.print  ("8 ");
+      break;
+    case ADXL343_RANGE_4_G:
+      Serial.print  ("4 ");
+      break;
+    case ADXL343_RANGE_2_G:
+      Serial.print  ("2 ");
+      break;
+    default:
+      Serial.print  ("?? ");
+      break;
+  }
+  Serial.println(" g");
+}
+
+void setup(void)
+{
+  Serial.begin(9600);
+  while (!Serial);
+  Serial.println("Accelerometer Test"); Serial.println("");
+
+  /* Initialise the sensor */
+  if(!accel.begin())
+  {
+    /* There was a problem detecting the ADXL343 ... check your connections */
+    Serial.println("Ooops, no ADXL343 detected ... Check your wiring!");
+    while(1);
+  }
+
+  /* Set the range to whatever is appropriate for your project */
+  accel.setRange(ADXL343_RANGE_16_G);
+  // accel.setRange(ADXL343_RANGE_8_G);
+  // accel.setRange(ADXL343_RANGE_4_G);
+  // accel.setRange(ADXL343_RANGE_2_G);
+
+  /* Display some basic information on this sensor */
+  displaySensorDetails();
+  displayDataRate();
+  displayRange();
+  Serial.println("");
+}
+
+void loop(void)
+{
+  /* Get a new sensor event */
+  sensors_event_t event;
+  accel.getEvent(&event);
+
+  /* Display the results (acceleration is measured in m/s^2) */
+  Serial.print("X: "); Serial.print(event.acceleration.x); Serial.print("  ");
+  Serial.print("Y: "); Serial.print(event.acceleration.y); Serial.print("  ");
+  Serial.print("Z: "); Serial.print(event.acceleration.z); Serial.print("  ");Serial.println("m/s^2 ");
+  delay(500);
+}

lib/Adafruit_Sensor/library.properties

@@ -0,0 +1,11 @@
+name=Adafruit Unified Sensor
+version=1.1.7
+author=Adafruit <info@adafruit.com>
+maintainer=Adafruit <info@adafruit.com>
+sentence=Required for all Adafruit Unified Sensor based libraries.
+paragraph=A unified sensor abstraction layer used by many Adafruit sensor libraries.
+category=Sensors
+url=https://github.com/adafruit/Adafruit_Sensor
+architectures=*
+includes=Adafruit_Sensor.h
+