Starting a Conversion

The type of trigger selected with AFEC_MR.TRGEN determines when a conversion starts.

If a hardware (external) trigger is selected (AFEC_MR.TRGEN = 1), the conversion starts automatically after the trigger event programmed in AFEC_MR.TRGSEL.

Code example to select the trigger source:

1. 1.Set AFEC_MR.TRGEN = 1:

   /* Step 3: AFEC Mode Register Configuration */
   AFEC_SetModeReg(
   AFEC0,AFEC_MR_FREERUN_OFF|AFEC_MR_TRANSFER(1)|AFEC_MR_TRACKTIM(2)|AFEC_MR_ONE| AFEC_MR_STARTUP_SUT512| AFEC_MR_TRGEN_EN);

2. 2.Select the trigger source:

   /**
    * \brief Set AFE trigger.
    *
    * \param pAFE Pointer to an AFE instance.
    * \param dwTrgSel Trigger selection
    */
   extern void AFEC_SetTrigger( Afec* pAFE, uint32_t dwTrgSel )
   {
   	uint32_t dwMr;
   
   	dwMr = pAFE->AFEC_MR;
   	dwMr &= ~AFEC_MR_TRGSEL_Msk;
   	dwMr |= dwTrgSel;
   	pAFE->AFEC_MR |= dwMr;
   }

If a software trigger is selected, (AFEC_MR.TRGEN = 0), the conversion starts immediately after setting the START bit of the AFEC Control Register (AFEC_CR).

Code example to start a software conversion:

/* Start Conversion by software trigger */
AFEC_StartConversion(AFEC0);