vddcheck.c

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/**************************************************************************/
#include <stdint.h>
#include <stdbool.h>
#include "em_cmu.h"
#include "em_vcmp.h"
#include "vddcheck.h"

/**************************************************************************/
void VDDCHECK_Init(void)
{
  /* Enable LE peripherals */
  CMU_ClockEnable(cmuClock_CORELE, true);

  /* Enable VCMP clock */
  CMU_ClockEnable(cmuClock_VCMP, true);
}

/**************************************************************************/
void VDDCHECK_Disable(void)
{
  /* Disable VCMP */
  VCMP_Disable();

  /* Disable clock to VCMP */
  CMU_ClockEnable(cmuClock_VCMP, false);
}

/**************************************************************************/
bool VDDCHECK_LowVoltage(float vdd)
{
  VCMP_Init_TypeDef vcmp = VCMP_INIT_DEFAULT;

  /* Configure VCMP */
  vcmp.triggerLevel = VCMP_VoltageToLevel(vdd);
  vcmp.warmup       = vcmpWarmTime128Cycles;
  vcmp.lowPowerRef  = false;
  vcmp.enable       = true;

  VCMP_Init(&vcmp);

  /* Delay until warm up ready */
  while (!VCMP_Ready()) ;

  /* If zero result, voltage is lower */
  if (VCMP_VDDHigher()) return false;

  /* Otherwise return false */
  return true;
}