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NRF52Board - ShutdownPeripherals() housekeeping #2987

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Merged
fdlamotte merged 1 commit into from
Jul 20, 2026
+27 −3
Merged

NRF52Board - ShutdownPeripherals() housekeeping #2987

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30 changes: 27 additions & 3 deletions src/helpers/NRF52Board.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -314,14 +314,38 @@ float NRF52Board::getMCUTemperature() {
void NRF52Board::shutdownPeripherals() {
// Power off the display if any
#ifdef DISPLAY_CLASS
display.turnOff();
if (display.isOn()) {
display.turnOff();
}
#endif

// Prep LoRa radio for power down
#ifdef P_LORA_RESET
digitalWrite(P_LORA_RESET, HIGH); // preload OUT latch so pinMode can't glitch NRESET low
pinMode(P_LORA_RESET, OUTPUT);
digitalWrite(P_LORA_RESET, LOW); // deliberate hardware reset (datasheet: >=100us)
delayMicroseconds(200);
digitalWrite(P_LORA_RESET, HIGH);
#endif
#if defined(P_LORA_SCLK) && defined(P_LORA_MISO) && defined(P_LORA_MOSI)
SPI.setPins(P_LORA_MISO, P_LORA_SCLK, P_LORA_MOSI);
SPI.begin(); // SPI may not be started on some shutdown paths, need it to shut down radio
#endif
#ifdef P_LORA_BUSY
pinMode(P_LORA_BUSY, INPUT);
uint32_t started_at = millis();
while (digitalRead(P_LORA_BUSY) && millis() - started_at < 10) {} //wait for radio to be ready
#endif
#ifdef P_LORA_NSS
pinMode(P_LORA_NSS, OUTPUT);
digitalWrite(P_LORA_NSS, HIGH);
#endif
// Power off LoRa
radio_driver.powerOff();

// Keep LoRa inactive during deepsleep
digitalWrite(P_LORA_NSS, HIGH);
#ifdef P_LORA_NSS
digitalWrite(P_LORA_NSS, HIGH);
#endif

// Power off GPS if any
if(sensors.getLocationProvider() != NULL) {
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