#include <lp_ADC.h>
#include <lp_timer.h>

// for debug only, leave commented out for measuring current
#define DEBUG

// this method is called on the loop() thread
void handle_ADC_result(int count) {
#ifdef DEBUG
  Serial.print("ADC result ");
  Serial.print((count * 3.0) / 1023);
  Serial.println("V  ");
#endif
  // start again immediately
  uint32_t err = lp_ADC_start(31, handle_ADC_result);  // pin 31 on BareBoard nRF52832, see lp_ADC.h file
#ifdef DEBUG
  if (err != 0) {  // if err != 0 then either arg error or busy err == 17 => busy
    if (err == 17) { // NRF_ERROR_BUSY) {
      Serial.println("adcBusy");
    } else {
      Serial.print("adc argument error:");    Serial.println(err);
    }
  }
#endif
}

void setup() {
  // using default Serial Tx=29, Rx=30 pins
#ifdef DEBUG
  Serial.begin(115200);
  for (int i = 10; i > 0; i--) {
    Serial.print(i); Serial.print(' ');
    delay(500);
  }
  Serial.println();
#endif
  lp_ADC_calibrate(); // do a calibration before the first sample,  add a timer to re-calibrate every min or so to allow for temperature changes.
  uint32_t err = lp_ADC_start(31, handle_ADC_result);  // pin P0.31 on BareBoard nRF52832, see lp_ADC.h file
}

void loop() {
  // put your main code here, to run repeatedly:
  sleep();
#ifdef DEBUG
  // Serial.println("loop Woke up");
#endif
}