Exercise 10 works now, #9 needs to be revised accordingly
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431
exercises/10_Simple_GPS/src/main.cpp
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431
exercises/10_Simple_GPS/src/main.cpp
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// 20260217 ChatGPT
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// $Id$
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// $HeadURL$
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#include <Arduino.h>
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#include <Wire.h>
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#include <U8g2lib.h>
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#include "tbeam_supreme_adapter.h"
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#ifndef OLED_SDA
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#define OLED_SDA 17
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#endif
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#ifndef OLED_SCL
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#define OLED_SCL 18
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#endif
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#ifndef OLED_ADDR
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#define OLED_ADDR 0x3C
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#endif
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#ifndef RTC_I2C_ADDR
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#define RTC_I2C_ADDR 0x51
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#endif
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#ifndef GPS_BAUD
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#define GPS_BAUD 9600
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#endif
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static const uint32_t kSerialDelayMs = 5000;
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static const uint32_t kReportIntervalMs = 30000;
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static XPowersLibInterface* g_pmu = nullptr;
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static U8G2_SH1106_128X64_NONAME_F_HW_I2C g_oled(U8G2_R0, /* reset=*/U8X8_PIN_NONE);
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static HardwareSerial g_gpsSerial(1);
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static uint32_t g_logSeq = 0;
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static uint32_t g_lastReportMs = 0;
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static uint32_t g_gpsBaud = GPS_BAUD;
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static char g_gpsLine[128];
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static size_t g_gpsLineLen = 0;
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struct RtcDateTime {
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uint16_t year;
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uint8_t month;
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uint8_t day;
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uint8_t hour;
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uint8_t minute;
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uint8_t second;
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};
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struct GpsState {
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bool sawAnySentence = false;
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uint8_t satsUsed = 0;
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uint8_t satsInView = 0;
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bool hasValidUtc = false;
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uint16_t utcYear = 0;
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uint8_t utcMonth = 0;
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uint8_t utcDay = 0;
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uint8_t utcHour = 0;
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uint8_t utcMinute = 0;
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uint8_t utcSecond = 0;
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};
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static GpsState g_gps;
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static void logf(const char* fmt, ...) {
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char msg[220];
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va_list args;
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va_start(args, fmt);
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vsnprintf(msg, sizeof(msg), fmt, args);
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va_end(args);
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Serial.printf("[%10lu][%06lu] %s\r\n", (unsigned long)millis(), (unsigned long)g_logSeq++, msg);
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}
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static void oledShowLines(const char* l1,
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const char* l2 = nullptr,
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const char* l3 = nullptr,
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const char* l4 = nullptr,
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const char* l5 = nullptr) {
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g_oled.clearBuffer();
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g_oled.setFont(u8g2_font_5x8_tf);
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if (l1) g_oled.drawUTF8(0, 12, l1);
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if (l2) g_oled.drawUTF8(0, 24, l2);
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if (l3) g_oled.drawUTF8(0, 36, l3);
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if (l4) g_oled.drawUTF8(0, 48, l4);
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if (l5) g_oled.drawUTF8(0, 60, l5);
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g_oled.sendBuffer();
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}
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static uint8_t fromBcd(uint8_t b) {
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return ((b >> 4U) * 10U) + (b & 0x0FU);
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}
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static bool rtcRead(RtcDateTime& out, bool& lowVoltageFlag) {
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Wire1.beginTransmission(RTC_I2C_ADDR);
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Wire1.write(0x02);
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if (Wire1.endTransmission(false) != 0) {
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return false;
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}
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const uint8_t need = 7;
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uint8_t got = Wire1.requestFrom((int)RTC_I2C_ADDR, (int)need);
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if (got != need) {
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return false;
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}
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uint8_t sec = Wire1.read();
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uint8_t min = Wire1.read();
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uint8_t hour = Wire1.read();
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uint8_t day = Wire1.read();
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(void)Wire1.read();
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uint8_t month = Wire1.read();
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uint8_t year = Wire1.read();
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lowVoltageFlag = (sec & 0x80U) != 0;
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out.second = fromBcd(sec & 0x7FU);
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out.minute = fromBcd(min & 0x7FU);
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out.hour = fromBcd(hour & 0x3FU);
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out.day = fromBcd(day & 0x3FU);
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out.month = fromBcd(month & 0x1FU);
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uint8_t yy = fromBcd(year);
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bool century = (month & 0x80U) != 0;
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out.year = century ? (1900U + yy) : (2000U + yy);
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return true;
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}
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static String formatRtcNow() {
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RtcDateTime now{};
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bool lowV = false;
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if (!rtcRead(now, lowV)) {
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return "RTC read failed";
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}
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char buf[48];
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snprintf(buf,
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sizeof(buf),
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"RTC %04u-%02u-%02u %02u:%02u:%02u%s",
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(unsigned)now.year,
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(unsigned)now.month,
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(unsigned)now.day,
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(unsigned)now.hour,
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(unsigned)now.minute,
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(unsigned)now.second,
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lowV ? " !LOWV" : "");
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return String(buf);
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}
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static bool parseUInt2(const char* s, uint8_t& out) {
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if (!s || !isdigit((unsigned char)s[0]) || !isdigit((unsigned char)s[1])) {
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return false;
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}
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out = (uint8_t)((s[0] - '0') * 10 + (s[1] - '0'));
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return true;
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}
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static void parseGga(char* fields[], int count) {
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if (count <= 7) {
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return;
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}
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int sats = atoi(fields[7]);
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if (sats >= 0 && sats <= 255) {
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g_gps.satsUsed = (uint8_t)sats;
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}
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}
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static void parseGsv(char* fields[], int count) {
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if (count <= 3) {
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return;
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}
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int sats = atoi(fields[3]);
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if (sats >= 0 && sats <= 255) {
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g_gps.satsInView = (uint8_t)sats;
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}
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}
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static void parseRmc(char* fields[], int count) {
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if (count <= 9) {
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return;
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}
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const char* utc = fields[1];
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const char* status = fields[2];
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const char* date = fields[9];
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if (!status || status[0] != 'A') {
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return;
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}
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if (!utc || strlen(utc) < 6 || !date || strlen(date) < 6) {
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return;
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}
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uint8_t hh = 0, mm = 0, ss = 0;
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uint8_t dd = 0, mo = 0, yy = 0;
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if (!parseUInt2(utc + 0, hh) || !parseUInt2(utc + 2, mm) || !parseUInt2(utc + 4, ss)) {
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return;
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}
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if (!parseUInt2(date + 0, dd) || !parseUInt2(date + 2, mo) || !parseUInt2(date + 4, yy)) {
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return;
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}
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g_gps.utcHour = hh;
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g_gps.utcMinute = mm;
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g_gps.utcSecond = ss;
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g_gps.utcDay = dd;
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g_gps.utcMonth = mo;
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g_gps.utcYear = (uint16_t)(2000U + yy);
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g_gps.hasValidUtc = true;
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}
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static void processNmeaLine(char* line) {
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if (!line || line[0] != '$') {
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return;
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}
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g_gps.sawAnySentence = true;
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char* star = strchr(line, '*');
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if (star) {
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*star = '\0';
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}
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char* fields[24] = {0};
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int count = 0;
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char* saveptr = nullptr;
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char* tok = strtok_r(line, ",", &saveptr);
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while (tok && count < 24) {
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fields[count++] = tok;
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tok = strtok_r(nullptr, ",", &saveptr);
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}
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if (count <= 0 || !fields[0]) {
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return;
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}
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const char* header = fields[0];
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size_t n = strlen(header);
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if (n < 6) {
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return;
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}
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const char* type = header + (n - 3);
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if (strcmp(type, "GGA") == 0) {
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parseGga(fields, count);
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} else if (strcmp(type, "GSV") == 0) {
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parseGsv(fields, count);
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} else if (strcmp(type, "RMC") == 0) {
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parseRmc(fields, count);
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}
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}
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static void pollGpsSerial() {
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while (g_gpsSerial.available() > 0) {
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char c = (char)g_gpsSerial.read();
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if (c == '\r') {
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continue;
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}
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if (c == '\n') {
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if (g_gpsLineLen > 0) {
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g_gpsLine[g_gpsLineLen] = '\0';
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processNmeaLine(g_gpsLine);
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g_gpsLineLen = 0;
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}
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continue;
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}
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if (g_gpsLineLen + 1 < sizeof(g_gpsLine)) {
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g_gpsLine[g_gpsLineLen++] = c;
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} else {
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g_gpsLineLen = 0;
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}
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}
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}
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static void startGpsUart(uint32_t baud) {
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g_gpsSerial.end();
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delay(20);
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g_gpsSerial.setRxBufferSize(1024);
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g_gpsSerial.begin(baud, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
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g_gpsBaud = baud;
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}
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static bool collectGpsTraffic(uint32_t windowMs) {
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uint32_t start = millis();
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size_t bytesSeen = 0;
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while ((uint32_t)(millis() - start) < windowMs) {
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while (g_gpsSerial.available() > 0) {
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(void)g_gpsSerial.read();
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bytesSeen++;
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}
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pollGpsSerial();
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delay(2);
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}
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return bytesSeen > 0 || g_gps.sawAnySentence;
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}
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static bool probeGpsAtBaud(uint32_t baud) {
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startGpsUart(baud);
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logf("Probing GPS at %lu baud...", (unsigned long)baud);
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if (collectGpsTraffic(700)) {
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return true;
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}
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// Try common query/wake commands used by MTK/L76K and related chipsets.
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g_gpsSerial.write("$PCAS06,0*1B\r\n"); // Request module SW text
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g_gpsSerial.write("$PMTK605*31\r\n"); // MTK firmware query
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g_gpsSerial.write("$PQTMVERNO*58\r\n"); // Quectel LC86 query
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g_gpsSerial.write("$PMTK353,1,1,1,1,1*2A\r\n");
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g_gpsSerial.write("$PMTK314,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29\r\n");
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return collectGpsTraffic(1200);
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}
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static void initialGpsProbe() {
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const uint32_t bauds[] = {GPS_BAUD, 115200, 38400, 57600, 19200};
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for (size_t i = 0; i < sizeof(bauds) / sizeof(bauds[0]); ++i) {
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if (probeGpsAtBaud(bauds[i])) {
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logf("GPS traffic detected at %lu baud", (unsigned long)g_gpsBaud);
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return;
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}
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}
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logf("No GPS traffic detected during startup probe");
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}
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static uint8_t bestSatelliteCount() {
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return (g_gps.satsUsed > g_gps.satsInView) ? g_gps.satsUsed : g_gps.satsInView;
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}
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static void showTryingMessage() {
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String rtc = formatRtcNow();
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oledShowLines("Trying to locate",
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"satellites",
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g_gps.sawAnySentence ? "NMEA seen: yes" : "NMEA seen: no",
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rtc.c_str());
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logf("Trying to locate satellites. %s", rtc.c_str());
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}
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static void showStatusMessage() {
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uint8_t sats = bestSatelliteCount();
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if (g_gps.hasValidUtc) {
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char line2[40];
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char line3[28];
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snprintf(line2,
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sizeof(line2),
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"GPS UTC %04u-%02u-%02u",
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(unsigned)g_gps.utcYear,
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(unsigned)g_gps.utcMonth,
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(unsigned)g_gps.utcDay);
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snprintf(line3,
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sizeof(line3),
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"%02u:%02u:%02u sats:%u",
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(unsigned)g_gps.utcHour,
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(unsigned)g_gps.utcMinute,
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(unsigned)g_gps.utcSecond,
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(unsigned)sats);
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oledShowLines("GPS lock acquired",
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line2,
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line3,
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g_gps.sawAnySentence ? "NMEA seen: yes" : "NMEA seen: no");
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logf("GPS lock acquired. %s sats=%u", line3, (unsigned)sats);
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return;
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}
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String rtc = formatRtcNow();
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oledShowLines("Take me outside",
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"No GPS time/sats yet",
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g_gps.sawAnySentence ? "NMEA seen: yes" : "NMEA seen: no",
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rtc.c_str());
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logf("Take me outside. sats=%u, has_utc=%s, nmea_seen=%s. %s",
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(unsigned)sats,
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g_gps.hasValidUtc ? "yes" : "no",
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g_gps.sawAnySentence ? "yes" : "no",
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rtc.c_str());
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}
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void setup() {
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Serial.begin(115200);
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delay(kSerialDelayMs);
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Serial.println("\r\n==================================================");
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Serial.println("Exercise 10: Simple GPS (No SD)");
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Serial.println("==================================================");
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if (!tbeam_supreme::initPmuForPeripherals(g_pmu, &Serial)) {
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logf("PMU init failed");
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}
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Wire.begin(OLED_SDA, OLED_SCL);
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g_oled.setI2CAddress(OLED_ADDR << 1);
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g_oled.begin();
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oledShowLines("Simple GPS", "Booting...");
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#ifdef GPS_1PPS_PIN
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pinMode(GPS_1PPS_PIN, INPUT);
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#endif
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#ifdef GPS_WAKEUP_PIN
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// Keep wake pin in a neutral state similar to Meshtastic behavior.
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pinMode(GPS_WAKEUP_PIN, INPUT);
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#endif
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startGpsUart(GPS_BAUD);
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logf("GPS UART started: RX=%d TX=%d baud=%lu", GPS_RX_PIN, GPS_TX_PIN, (unsigned long)g_gpsBaud);
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initialGpsProbe();
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showTryingMessage();
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g_lastReportMs = millis();
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}
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void loop() {
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pollGpsSerial();
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uint32_t now = millis();
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if ((uint32_t)(now - g_lastReportMs) >= kReportIntervalMs) {
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g_lastReportMs = now;
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showTryingMessage();
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uint32_t start = millis();
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while ((uint32_t)(millis() - start) < 2000) {
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pollGpsSerial();
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delay(5);
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}
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showStatusMessage();
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}
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}
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