/**
* @brief Initializes the CEC mode according to the specified
* parameters in the CEC_InitTypeDef and creates the associated handle .
* @param hcec: CEC handle
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CEC_Init(CEC_HandleTypeDef *hcec)
{
/* Check the CEC handle allocation */
if((hcec == NULL) ||(hcec->Init.RxBuffer == NULL))
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_CEC_ALL_INSTANCE(hcec->Instance));
assert_param(IS_CEC_BIT_TIMING_ERROR_MODE(hcec->Init.TimingErrorFree));
assert_param(IS_CEC_BIT_PERIOD_ERROR_MODE(hcec->Init.PeriodErrorFree));
assert_param(IS_CEC_ADDRESS(hcec->Init.OwnAddress));
if(hcec->gState == HAL_CEC_STATE_RESET)
{
/* Allocate lock resource and initialize it */
hcec->Lock = HAL_UNLOCKED;
/* Init the low level hardware : GPIO, CLOCK */
HAL_CEC_MspInit(hcec);
}
hcec->gState = HAL_CEC_STATE_BUSY;
/* Disable the Peripheral */
__HAL_CEC_DISABLE(hcec);
/* Write to CEC Control Register */
MODIFY_REG(hcec->Instance->CFGR, CEC_CFGR_FIELDS, hcec->Init.TimingErrorFree | hcec->Init.PeriodErrorFree);
/* Write to CEC Own Address Register */
MODIFY_REG(hcec->Instance->OAR, CEC_OAR_OA, hcec->Init.OwnAddress);
/* Configure the prescaler to generate the required 50 microseconds time base.*/
MODIFY_REG(hcec->Instance->PRES, CEC_PRES_PRES, 50U * (HAL_RCC_GetPCLK1Freq()/1000000U) - 1U);
/* Enable the following CEC Interrupt */
__HAL_CEC_ENABLE_IT(hcec, CEC_IT_IE);
/* Enable the CEC Peripheral */
__HAL_CEC_ENABLE(hcec);
hcec->ErrorCode = HAL_CEC_ERROR_NONE;
hcec->gState = HAL_CEC_STATE_READY;
hcec->RxState = HAL_CEC_STATE_READY;
return HAL_OK;
}
/**
* @brief Initializes the CEC peripheral according to the specified
* parameters in the CEC_InitStruct.
* @param CEC_InitStruct: pointer to an CEC_InitTypeDef structure that
* contains the configuration information for the specified
* CEC peripheral.
* @retval None
*/
void CEC_Init(CEC_InitTypeDef* CEC_InitStruct)
{
uint16_t tmpreg = 0;
/* Check the parameters */
assert_param(IS_CEC_BIT_TIMING_ERROR_MODE(CEC_InitStruct->CEC_BitTimingMode));
assert_param(IS_CEC_BIT_PERIOD_ERROR_MODE(CEC_InitStruct->CEC_BitPeriodMode));
/*---------------------------- CEC CFGR Configuration -----------------*/
/* Get the CEC CFGR value */
tmpreg = CEC->CFGR;
/* Clear BTEM and BPEM bits */
tmpreg &= CFGR_CLEAR_Mask;
/* Configure CEC: Bit Timing Error and Bit Period Error */
tmpreg |= (uint16_t)(CEC_InitStruct->CEC_BitTimingMode | CEC_InitStruct->CEC_BitPeriodMode);
/* Write to CEC CFGR register*/
CEC->CFGR = tmpreg;
}
