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Display Fix for different versions of TBeam Supreme #2591

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Display Fix for different versions of TBeam Supreme #2591

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20 changes: 19 additions & 1 deletion src/helpers/ui/SH1106Display.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,25 @@ bool SH1106Display::i2c_probe(TwoWire &wire, uint8_t addr)

bool SH1106Display::begin()
{
return display.begin(DISPLAY_ADDRESS, true) && i2c_probe(Wire, DISPLAY_ADDRESS);
// Some T-Beam S3 Supreme revisions ship a QMC6310N magnetometer whose
// configurable I2C address (0x3C / 0x3D) collides with the OLED's. Probe
// both candidate addresses and disambiguate via the magnetometer's chip-ID
// register: read of reg 0x00 returns 0x80 on the QMC6310N. Same trick
// LilyGo's factory firmware uses.
uint8_t candidates[] = { DISPLAY_ADDRESS, 0x3D };
uint8_t found = 0;
for (uint8_t addr : candidates) {
if (!i2c_probe(Wire, addr)) continue;
Wire.beginTransmission(addr);
Wire.write((uint8_t)0x00);
if (Wire.endTransmission() != 0) continue;
if (Wire.requestFrom((int)addr, (int)1) != 1) continue;
if (Wire.read() == 0x80) continue; // magnetometer, not the OLED
found = addr;
break;
}
if (found == 0) return false;
return display.begin(found, true);
}

void SH1106Display::turnOn()
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