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Wire vs. Wire1, still needs to be sorted out. ChatGPT has some tests to clarify which I will try after this commit. Magnetometer is on Wire and RTC is on Wire1, this apparently conflicts with the documentation. Getting values, though when I rotated both standing up and sideways, I did not see values ranging from 0-360.

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John Poole 2026-04-17 12:30:56 -07:00
commit fa212c80e6
2 changed files with 16 additions and 9 deletions
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2
exercises/22_compass/README.md
View file

@ -205,7 +205,7 @@ Suggested workflow:
## Bottom Line
The examples are enough to establish that this sensor is suitable for a live heading and magnetic field display exercise. The only caution is that the example labeled "calibration" is session-local unless we explicitly persist the offsets. The first useful deliverable for this exercise should therefore be a per-unit magnetometer assay plus a serial real-time monitor, followed by persistent calibration storage and then an OLED compass view.
The examples are enough to establish that this sensor is suitable for a live heading and magnetic field display exercise. The only caution is that the example labeled "calibration" is session-local unless we explicitly save in non-volatile memory the offsets. The first useful deliverable for this exercise should therefore be a per-unit magnetometer assay plus a serial real-time monitor, followed by persistent calibration storage and then an OLED compass view.
## Local Helper Scripts

23
exercises/22_compass/src/main.cpp
View file

@ -398,7 +398,7 @@ void startWebServer() {
Serial.println("wifi_ap=failed");
return;
}
Serial.println("wifi_ap=started");
g_server.on("/", HTTP_GET, handleWebIndex);
g_server.on("/files", HTTP_GET, handleWebFiles);
g_server.on("/download", HTTP_GET, handleWebDownload);
@ -415,17 +415,24 @@ bool probeI2cAddr(TwoWire& wire, uint8_t addr) {
}
bool detectMagnetometer() {
Serial.printf("Detecting magnetometer, kMagCandidateCount: %u\n", kMagCandidateCount);
for (uint8_t i = 0; i < kMagCandidateCount; ++i) {
const uint8_t addr = kMagCandidates[i];
if (!probeI2cAddr(Wire1, addr)) {
Serial.printf(" candidate[%u] = 0x%02X\n", i, kMagCandidates[i]);
//
if (!probeI2cAddr(Wire, addr)) {
continue;
}
Serial.printf("Found device at 0x%02X, probing for magnetometer...\n", addr);
if (addr == 0x3C || addr == 0x3D) {
Wire1.beginTransmission(addr);
Wire1.write((uint8_t)0x00);
if (Wire1.endTransmission(false) == 0 && Wire1.requestFrom((int)addr, 1) == 1) {
const uint8_t marker = Wire1.read();
//Wire1.beginTransmission(addr);
//Wire1.write((uint8_t)0x00);
//if (Wire1.endTransmission(false) == 0 && Wire1.requestFrom((int)addr, 1) == 1) {
Wire.beginTransmission(addr);
Wire.write((uint8_t)0x00);
if (Wire.endTransmission(false) == 0 && Wire.requestFrom((int)addr, 1) == 1) {
const uint8_t marker = Wire.read(); // was Wire1.read() in original code, but that seems wrong since Wire1 is a different bus
if (marker != 0x80) {
continue;
}
@ -452,7 +459,7 @@ bool initMagnetometer() {
return false;
}
if (!g_qmc.begin(Wire1, g_magAddress, tbeam_supreme::i2cSda(), tbeam_supreme::i2cScl())) {
if (!g_qmc.begin(Wire, g_magAddress, tbeam_supreme::i2cSda(), tbeam_supreme::i2cScl())) {
return false;
}
@ -683,7 +690,7 @@ void appSetup() {
Serial.println("sd_mount=ok");
g_sd.printCardInfo();
}
// Next is the failure point
g_magReady = initMagnetometer();
if (!g_magReady) {
Serial.println("magnetometer_init=failed");