em_vcmp.c

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/***************************************************************************/
#include "em_vcmp.h"
#if defined(VCMP_COUNT) && (VCMP_COUNT > 0)

#include "em_assert.h"

/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
void VCMP_Init(const VCMP_Init_TypeDef *vcmpInit)
{
  /* Verify input */
  EFM_ASSERT((vcmpInit->inactive == 0) || (vcmpInit->inactive == 1));
  EFM_ASSERT((vcmpInit->biasProg >= 0) && (vcmpInit->biasProg < 16));

  /* Configure Half Bias setting */
  if (vcmpInit->halfBias)
  {
    VCMP->CTRL |= VCMP_CTRL_HALFBIAS;
  }
  else
  {
    VCMP->CTRL &= ~(VCMP_CTRL_HALFBIAS);
  }

  /* Configure bias prog */
  VCMP->CTRL &= ~(_VCMP_CTRL_BIASPROG_MASK);
  VCMP->CTRL |= (vcmpInit->biasProg << _VCMP_CTRL_BIASPROG_SHIFT);

  /* Configure sense for falling edge */
  if (vcmpInit->irqFalling)
  {
    VCMP->CTRL |= VCMP_CTRL_IFALL;
  }
  else
  {
    VCMP->CTRL &= ~(VCMP_CTRL_IFALL);
  }

  /* Configure sense for rising edge */
  if (vcmpInit->irqRising)
  {
    VCMP->CTRL |= VCMP_CTRL_IRISE;
  }
  else
  {
    VCMP->CTRL &= ~(VCMP_CTRL_IRISE);
  }

  /* Configure warm-up time */
  VCMP->CTRL &= ~(_VCMP_CTRL_WARMTIME_MASK);
  VCMP->CTRL |= (vcmpInit->warmup << _VCMP_CTRL_WARMTIME_SHIFT);

  /* Configure hysteresis */
  switch (vcmpInit->hyst)
  {
    case vcmpHyst20mV:
      VCMP->CTRL |= VCMP_CTRL_HYSTEN;
      break;
    case vcmpHystNone:
      VCMP->CTRL &= ~(VCMP_CTRL_HYSTEN);
      break;
    default:
      break;
  }

  /* Configure inactive output value */
  VCMP->CTRL |= (vcmpInit->inactive << _VCMP_CTRL_INACTVAL_SHIFT);

  /* Configure trigger level */
  VCMP_TriggerSet(vcmpInit->triggerLevel);

  /* Enable or disable VCMP */
  if (vcmpInit->enable)
  {
    VCMP->CTRL |= VCMP_CTRL_EN;
  }
  else
  {
    VCMP->CTRL &= ~(VCMP_CTRL_EN);
  }

  /* If Low Power Reference is enabled, wait until VCMP is ready */
  /* before enabling it, see reference manual for deatils        */
  /* Configuring Low Power Ref without enable has no effect      */
  if(vcmpInit->lowPowerRef && vcmpInit->enable)
  {
    /* Poll for VCMP ready */
    while(!VCMP_Ready());
    VCMP_LowPowerRefSet(vcmpInit->lowPowerRef);
  }

  /* Clear edge interrupt */
  VCMP_IntClear(VCMP_IF_EDGE);
}


/***************************************************************************/
void VCMP_LowPowerRefSet(bool enable)
{
  if (enable)
  {
    VCMP->INPUTSEL |= VCMP_INPUTSEL_LPREF;
  }
  else
  {
    VCMP->INPUTSEL &= ~VCMP_INPUTSEL_LPREF;
  }
}


/***************************************************************************/
void VCMP_TriggerSet(int level)
{
  /* Trigger range is 6 bits, value from 0-63 */
  EFM_ASSERT((level > 0) && (level < 64));

  /* Set trigger level */
  VCMP->INPUTSEL = (VCMP->INPUTSEL & ~(_VCMP_INPUTSEL_TRIGLEVEL_MASK))
                   | (level << _VCMP_INPUTSEL_TRIGLEVEL_SHIFT);
}


#endif /* defined(VCMP_COUNT) && (VCMP_COUNT > 0) */