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rak: keep WB_IO2 driven HIGH after a failed RAK12500 probe #3834

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rak: keep WB_IO2 driven HIGH after a failed RAK12500 probe #3834

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10 changes: 9 additions & 1 deletion src/helpers/sensors/RakI2cGpsDriver.h
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,15 @@ class RakI2cGpsDriver : public GpsDriver {
}

#ifndef RAK_3401
pinMode(powerPin, INPUT);
if (powerPin == WB_IO2) {
// WB_IO2 switches the 3V3_S slot rail, which also powers a serial GPS and the other
// slot modules. Left as an input, the rail follows whatever the base board pulls it
// to: some keep it on, others switch it off, and the serial GPS loses power (#3830).
// Keep it driven HIGH, as before the probe; a GPS power pin re-claims it later.
digitalWrite(powerPin, HIGH);
} else {
pinMode(powerPin, INPUT);
}
#endif
return false;
}
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