MeshCore/src/helpers/NRF52Board.cpp

#if defined(NRF52_PLATFORM)
#include "NRF52Board.h"

void NRF52Board::begin() {
  startup_reason = BD_STARTUP_NORMAL;
}

void NRF52BoardDCDC::begin() {
  NRF52Board::begin();

  // Enable DC/DC converter for improved power efficiency
  uint8_t sd_enabled = 0;
  sd_softdevice_is_enabled(&sd_enabled);
  if (sd_enabled) {
    sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);
  } else {
    NRF_POWER->DCDCEN = 1;
  }
}

// Temperature from NRF52 MCU
float NRF52Board::getMCUTemperature() {
  NRF_TEMP->TASKS_START = 1; // Start temperature measurement

  long startTime = millis();  
  while (NRF_TEMP->EVENTS_DATARDY == 0) { // Wait for completion. Should complete in 50us
    if(millis() - startTime > 5) {  // To wait 5ms just in case
      NRF_TEMP->TASKS_STOP = 1;
      return NAN;
    }
  }
  
  NRF_TEMP->EVENTS_DATARDY = 0; // Clear event flag

  int32_t temp = NRF_TEMP->TEMP; // In 0.25 *C units
  NRF_TEMP->TASKS_STOP = 1;

  return temp * 0.25f; // Convert to *C
}
#endif