/*****************************************************************************************************
* Function: adc_init()
*
* Description: Service for ADC initialization
*
* Caveats: Non Reentrant
*****************************************************************************************************/
void ADC_init (void)
{
AFEC0->AFEC_CR = AFEC_CR_SWRST;
//ADC_EnablePeripheral_GLCK();
ADC_EnablePeripheral_MCK(ADC_CHANNEL_0);
/* Wait 64 periods of AFE clock */
/* Set AFE Clock to 1MHz*/
AFEC0->AFEC_MR = AFEC_MR_TRANSFER(15) | AFEC_MR_TRACKTIM(15) | AFEC_MR_ONE | AFEC_MR_STARTUP(4) | AFEC_MR_PRESCAL(125) /*| TAG */;
/* RES - No Average - Set to 12 bit resolution */
/* TAG - Appends the channel number to the conversion result in AFEC_LDCR */
/* STM - Only a single trigger is required to get an averaged value */
AFEC0->AFEC_EMR = AFEC_EMR_RES(0) | AFEC_EMR_CMPSEL(0) | AFEC_EMR_CMPMODE(AFEC_EMR_CMPMODE_IN) | AFEC_EMR_TAG;
/* AFEC Channel Enable Register */
AFEC0->AFEC_CHER = AFEC_CHER_CH3;
AFEC0->AFEC_CWR = AFEC_CWR_LOWTHRES(0) | AFEC_CWR_HIGHTHRES(0xFFFF);
/* AFEC Interrupt Enable Register */
//AFEC0->AFEC_IER = AFEC_IER_EOC0;
/* AFEC Channel Selection Register */
//AFEC0->AFEC_CSELR = AFEC_CSELR_CSEL(1);
// NVIC_DisableIRQ(AFEC0_IRQn);
// NVIC_ClearPendingIRQ(AFEC0_IRQn);
// NVIC_SetPriority(AFEC0_IRQn,2);
// NVIC_EnableIRQ(AFEC0_IRQn);
// AFEC0->AFEC_IER = AFEC_IER_EOC3 | AFEC_IER_DRDY;
}
/**
* Set AFE tracking time
* \param pAFE Pointer to an AFE instance.
* \param dwNs Tracking time in nS.
*/
void AFEC_SetTrackingTime( Afec *pAFE, uint32_t dwNs )
{
uint32_t dwShtim;
uint32_t dwMr;
if (dwAFEClock == 0) return;
/* Formula for SHTIM is:
SHTIM = (time x AFECLK) / (1000000000) - 1
Since 1 billion is close to the maximum value for an integer, we first
divide AFECLK by 1000 to avoid an overflow */
dwShtim = (dwNs * (dwAFEClock / 1000)) / 100000;
if (dwShtim % 10) dwShtim /= 10;
else
{
dwShtim /= 10;
if (dwShtim) dwShtim --;
}
dwMr = AFEC_MR_TRACKTIM(dwShtim);
dwMr |= pAFE->AFEC_MR & ~AFEC_MR_TRACKTIM_Msk;
pAFE->AFEC_MR = dwMr;
}
