em_timer.c

Go to the documentation of this file.

/***************************************************************************/
#include "em_timer.h"
#if defined(TIMER_COUNT) && (TIMER_COUNT > 0)

#include "em_assert.h"

/***************************************************************************/
/***************************************************************************/
/*******************************************************************************
 **************************   GLOBAL FUNCTIONS   *******************************
 ******************************************************************************/

/***************************************************************************/
void TIMER_Init(TIMER_TypeDef *timer, const TIMER_Init_TypeDef *init)
{
  EFM_ASSERT(TIMER_REF_VALID(timer));

  /* Stop timer if specified to be disabled (dosn't hurt if already stopped) */
  if (!(init->enable))
  {
    timer->CMD = TIMER_CMD_STOP;
  }

  /* Reset counter */
  timer->CNT = _TIMER_CNT_RESETVALUE;

  timer->CTRL = ((uint32_t)(init->prescale)     << _TIMER_CTRL_PRESC_SHIFT)
                | ((uint32_t)(init->clkSel)     << _TIMER_CTRL_CLKSEL_SHIFT)
                | ((uint32_t)(init->fallAction) << _TIMER_CTRL_FALLA_SHIFT)
                | ((uint32_t)(init->riseAction) << _TIMER_CTRL_RISEA_SHIFT)
                | ((uint32_t)(init->mode)       << _TIMER_CTRL_MODE_SHIFT)
                | (init->debugRun               ?   TIMER_CTRL_DEBUGRUN  : 0)
                | (init->dmaClrAct              ?   TIMER_CTRL_DMACLRACT : 0)
                | (init->quadModeX4             ?   TIMER_CTRL_QDM_X4    : 0)
                | (init->oneShot                ?   TIMER_CTRL_OSMEN     : 0)

#if defined(TIMER_CTRL_X2CNT) && defined(TIMER_CTRL_ATI)
                | (init->count2x                ?   TIMER_CTRL_X2CNT     : 0)
                | (init->ati                    ?   TIMER_CTRL_ATI       : 0)
#endif
                | (init->sync                   ?   TIMER_CTRL_SYNC      : 0);

  /* Start timer if specified to be enabled (dosn't hurt if already started) */
  if (init->enable)
  {
    timer->CMD = TIMER_CMD_START;
  }
}


/***************************************************************************/
void TIMER_InitCC(TIMER_TypeDef *timer,
                  unsigned int ch,
                  const TIMER_InitCC_TypeDef *init)
{
  EFM_ASSERT(TIMER_REF_VALID(timer));
  EFM_ASSERT(TIMER_CH_VALID(ch));

  timer->CC[ch].CTRL =
    ((uint32_t)(init->eventCtrl) << _TIMER_CC_CTRL_ICEVCTRL_SHIFT)
    | ((uint32_t)(init->edge)    << _TIMER_CC_CTRL_ICEDGE_SHIFT)
    | ((uint32_t)(init->prsSel)  << _TIMER_CC_CTRL_PRSSEL_SHIFT)
    | ((uint32_t)(init->cufoa)   << _TIMER_CC_CTRL_CUFOA_SHIFT)
    | ((uint32_t)(init->cofoa)   << _TIMER_CC_CTRL_COFOA_SHIFT)
    | ((uint32_t)(init->cmoa)    << _TIMER_CC_CTRL_CMOA_SHIFT)
    | ((uint32_t)(init->mode)    << _TIMER_CC_CTRL_MODE_SHIFT)
    | (init->filter              ?   TIMER_CC_CTRL_FILT_ENABLE : 0)
    | (init->prsInput            ?   TIMER_CC_CTRL_INSEL_PRS   : 0)
    | (init->coist               ?   TIMER_CC_CTRL_COIST       : 0)
    | (init->outInvert           ?   TIMER_CC_CTRL_OUTINV      : 0);
}


#if defined(_TIMER_DTCTRL_MASK)
/***************************************************************************/
void TIMER_InitDTI(TIMER_TypeDef *timer, const TIMER_InitDTI_TypeDef *init)
{
  EFM_ASSERT(TIMER0 == timer);

  /* Make sure the DTI unit is disabled while initializing. */
  TIMER_EnableDTI (timer, false);

  /* Setup the DTCTRL register.
     The enable bit will be set at the end of the function if specified. */
  timer->DTCTRL =
    (init->autoRestart              ?   TIMER_DTCTRL_DTDAS   : 0)
    | (init->activeLowOut           ?   TIMER_DTCTRL_DTIPOL  : 0)
    | (init->invertComplementaryOut ?   TIMER_DTCTRL_DTCINV  : 0)
    | (init->enablePrsSource        ?   TIMER_DTCTRL_DTPRSEN : 0)
    | ((uint32_t)(init->prsSel)     << _TIMER_DTCTRL_DTPRSSEL_SHIFT);

  /* Setup the DTTIME register. */
  timer->DTTIME =
    ((uint32_t)(init->prescale)   << _TIMER_DTTIME_DTPRESC_SHIFT)
    | ((uint32_t)(init->riseTime) << _TIMER_DTTIME_DTRISET_SHIFT)
    | ((uint32_t)(init->fallTime) << _TIMER_DTTIME_DTFALLT_SHIFT);

  /* Setup the DTFC register. */
  timer->DTFC =
    (init->enableFaultSourceCoreLockup      ?   TIMER_DTFC_DTLOCKUPFEN : 0)
    | (init->enableFaultSourceDebugger      ?   TIMER_DTFC_DTDBGFEN    : 0)
    | (init->enableFaultSourcePrsSel0       ?   TIMER_DTFC_DTPRS0FEN   : 0)
    | (init->enableFaultSourcePrsSel1       ?   TIMER_DTFC_DTPRS1FEN   : 0)
    | ((uint32_t)(init->faultAction)        << _TIMER_DTFC_DTFA_SHIFT)
    | ((uint32_t)(init->faultSourcePrsSel0) << _TIMER_DTFC_DTPRS0FSEL_SHIFT)
    | ((uint32_t)(init->faultSourcePrsSel1) << _TIMER_DTFC_DTPRS1FSEL_SHIFT);

  /* Setup the DTOGEN register. */
  timer->DTOGEN = init->outputsEnableMask;

  /* Clear any previous DTI faults.  */
  TIMER_ClearDTIFault(timer, TIMER_GetDTIFault(timer));

  /* Enable/disable before returning. */
  TIMER_EnableDTI (timer, init->enable);
}
#endif


/***************************************************************************/
void TIMER_Reset(TIMER_TypeDef *timer)
{
  int i;

  EFM_ASSERT(TIMER_REF_VALID(timer));

  /* Make sure disabled first, before resetting other registers */
  timer->CMD = TIMER_CMD_STOP;

  timer->CTRL = _TIMER_CTRL_RESETVALUE;
  timer->IEN  = _TIMER_IEN_RESETVALUE;
  timer->IFC  = _TIMER_IFC_MASK;
  timer->TOPB = _TIMER_TOPB_RESETVALUE;
  /* Write TOP after TOPB to invalidate TOPB (clear TIMER_STATUS_TOPBV) */
  timer->TOP  = _TIMER_TOP_RESETVALUE;
  timer->CNT  = _TIMER_CNT_RESETVALUE;
  /* Do not reset route register, setting should be done independently */
  /* (Note: ROUTE register may be locked by DTLOCK register.) */

  for (i = 0; TIMER_CH_VALID(i); i++)
  {
    timer->CC[i].CTRL = _TIMER_CC_CTRL_RESETVALUE;
    timer->CC[i].CCV  = _TIMER_CC_CCV_RESETVALUE;
    timer->CC[i].CCVB = _TIMER_CC_CCVB_RESETVALUE;
  }

  /* Reset dead time insertion module, no effect on timers without DTI */

#if defined(TIMER_DTLOCK_LOCKKEY_UNLOCK)
  /* Unlock DTI registers first in case locked */
  timer->DTLOCK = TIMER_DTLOCK_LOCKKEY_UNLOCK;

  timer->DTCTRL   = _TIMER_DTCTRL_RESETVALUE;
  timer->DTTIME   = _TIMER_DTTIME_RESETVALUE;
  timer->DTFC     = _TIMER_DTFC_RESETVALUE;
  timer->DTOGEN   = _TIMER_DTOGEN_RESETVALUE;
  timer->DTFAULTC = _TIMER_DTFAULTC_MASK;
#endif
}


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