/**
* @brief Send data in interrupt mode
* @param hcec: CEC handle.
* Function called under interruption only, once
* interruptions have been enabled by HAL_CEC_Transmit_IT()
* @retval HAL status
*/
static HAL_StatusTypeDef CEC_Transmit_IT(CEC_HandleTypeDef *hcec)
{
/* if the IP is already busy or if there is a previous transmission
already pending due to arbitration loss */
if ((hcec->State == HAL_CEC_STATE_BUSY_TX)
|| (__HAL_CEC_GET_TRANSMISSION_START_FLAG(hcec) != RESET))
{
/* set state to BUSY TX, in case it wasn't set already (case
* of transmission new attempt after arbitration loss) */
if (hcec->State != HAL_CEC_STATE_BUSY_TX)
{
hcec->State = HAL_CEC_STATE_BUSY_TX;
}
/* if all data have been sent */
if(hcec->TxXferCount == 0)
{
/* Disable Peripheral to write CEC_IER register */
__HAL_CEC_DISABLE(hcec);
/* Disable the CEC Transmission Interrupts */
__HAL_CEC_DISABLE_IT(hcec, CEC_IER_TXBRIE|CEC_IER_TXENDIE);
/* Disable the CEC Transmission Error Interrupts */
__HAL_CEC_DISABLE_IT(hcec, CEC_IER_TX_ALL_ERR);
/* Enable the Peripheral */
__HAL_CEC_ENABLE(hcec);
__HAL_CEC_CLEAR_FLAG(hcec,CEC_ISR_TXBR|CEC_ISR_TXEND);
hcec->State = HAL_CEC_STATE_READY;
HAL_CEC_TxCpltCallback(hcec);
return HAL_OK;
}
else
{
if (hcec->TxXferCount == 1)
{
/* if this is the last byte transmission, set TX End of Message (TXEOM) bit */
__HAL_CEC_LAST_BYTE_TX_SET(hcec);
}
/* clear Tx-Byte request flag */
__HAL_CEC_CLEAR_FLAG(hcec,CEC_ISR_TXBR);
hcec->Instance->TXDR = *hcec->pTxBuffPtr++;
hcec->TxXferCount--;
return HAL_OK;
}
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Send data in interrupt mode
* @param hcec: CEC handle
* @param InitiatorAddress: Initiator address
* @param DestinationAddress: destination logical address
* @param pData: pointer to input byte data buffer
* @param Size: amount of data to be sent in bytes (without counting the header).
* 0 means only the header is sent (ping operation).
* Maximum TX size is 15 bytes (1 opcode and up to 14 operands).
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CEC_Transmit_IT(CEC_HandleTypeDef *hcec, uint8_t InitiatorAddress, uint8_t DestinationAddress, uint8_t *pData, uint32_t Size)
{
/* if the IP isn't already busy and if there is no previous transmission
already pending due to arbitration lost */
if (hcec->gState == HAL_CEC_STATE_READY)
{
if((pData == NULL ) && (Size > 0U))
{
return HAL_ERROR;
}
assert_param(IS_CEC_ADDRESS(DestinationAddress));
assert_param(IS_CEC_ADDRESS(InitiatorAddress));
assert_param(IS_CEC_MSGSIZE(Size));
/* Process Locked */
__HAL_LOCK(hcec);
hcec->pTxBuffPtr = pData;
hcec->gState = HAL_CEC_STATE_BUSY_TX;
hcec->ErrorCode = HAL_CEC_ERROR_NONE;
/* initialize the number of bytes to send,
* 0 means only one header is sent (ping operation) */
hcec->TxXferCount = Size;
/* in case of no payload (Size = 0), sender is only pinging the system;
Set TX End of Message (TXEOM) bit, must be set before writing data to TXDR */
if (Size == 0U)
{
__HAL_CEC_LAST_BYTE_TX_SET(hcec);
}
/* send header block */
hcec->Instance->TXDR = ((uint8_t)(InitiatorAddress << CEC_INITIATOR_LSB_POS) |(uint8_t) DestinationAddress);
/* Set TX Start of Message (TXSOM) bit */
__HAL_CEC_FIRST_BYTE_TX_SET(hcec);
/* Process Unlocked */
__HAL_UNLOCK(hcec);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief This function handles CEC interrupt requests.
* @param hcec: CEC handle
* @retval None
*/
void HAL_CEC_IRQHandler(CEC_HandleTypeDef *hcec)
{
/* save interrupts register for further error or interrupts handling purposes */
uint32_t reg = 0U;
reg = hcec->Instance->ISR;
/* ----------------------------Arbitration Lost Management----------------------------------*/
/* CEC TX arbitration error interrupt occurred --------------------------------------*/
if((reg & CEC_FLAG_ARBLST) != RESET)
{
hcec->ErrorCode = HAL_CEC_ERROR_ARBLST;
__HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_ARBLST);
}
/* ----------------------------Rx Management----------------------------------*/
/* CEC RX byte received interrupt ---------------------------------------------------*/
if((reg & CEC_FLAG_RXBR) != RESET)
{
/* reception is starting */
hcec->RxState = HAL_CEC_STATE_BUSY_RX;
hcec->RxXferSize++;
/* read received byte */
*hcec->Init.RxBuffer++ = hcec->Instance->RXDR;
__HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_RXBR);
}
/* CEC RX end received interrupt ---------------------------------------------------*/
if((reg & CEC_FLAG_RXEND) != RESET)
{
/* clear IT */
__HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_RXEND);
/* Rx process is completed, restore hcec->RxState to Ready */
hcec->RxState = HAL_CEC_STATE_READY;
hcec->ErrorCode = HAL_CEC_ERROR_NONE;
hcec->Init.RxBuffer -= hcec->RxXferSize;
HAL_CEC_RxCpltCallback(hcec, hcec->RxXferSize);
hcec->RxXferSize = 0U;
}
/* ----------------------------Tx Management----------------------------------*/
/* CEC TX byte request interrupt ------------------------------------------------*/
if((reg & CEC_FLAG_TXBR) != RESET)
{
if (hcec->TxXferCount == 0U)
{
/* if this is the last byte transmission, set TX End of Message (TXEOM) bit */
__HAL_CEC_LAST_BYTE_TX_SET(hcec);
hcec->Instance->TXDR = *hcec->pTxBuffPtr++;
}
else
{
hcec->Instance->TXDR = *hcec->pTxBuffPtr++;
hcec->TxXferCount--;
}
/* clear Tx-Byte request flag */
__HAL_CEC_CLEAR_FLAG(hcec,CEC_FLAG_TXBR);
}
/* CEC TX end interrupt ------------------------------------------------*/
if((reg & CEC_FLAG_TXEND) != RESET)
{
__HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_TXEND);
/* Tx process is ended, restore hcec->gState to Ready */
hcec->gState = HAL_CEC_STATE_READY;
/* Call the Process Unlocked before calling the Tx call back API to give the possibility to
start again the Transmission under the Tx call back API */
__HAL_UNLOCK(hcec);
hcec->ErrorCode = HAL_CEC_ERROR_NONE;
HAL_CEC_TxCpltCallback(hcec);
}
/* ----------------------------Rx/Tx Error Management----------------------------------*/
if ((reg & (CEC_ISR_RXOVR|CEC_ISR_BRE|CEC_ISR_SBPE|CEC_ISR_LBPE|CEC_ISR_RXACKE|CEC_ISR_TXUDR|CEC_ISR_TXERR|CEC_ISR_TXACKE)) != 0U)
{
hcec->ErrorCode = reg;
__HAL_CEC_CLEAR_FLAG(hcec, HAL_CEC_ERROR_RXOVR|HAL_CEC_ERROR_BRE|CEC_FLAG_LBPE|CEC_FLAG_SBPE|HAL_CEC_ERROR_RXACKE|HAL_CEC_ERROR_TXUDR|HAL_CEC_ERROR_TXERR|HAL_CEC_ERROR_TXACKE);
if((reg & (CEC_ISR_RXOVR|CEC_ISR_BRE|CEC_ISR_SBPE|CEC_ISR_LBPE|CEC_ISR_RXACKE)) != RESET)
{
hcec->Init.RxBuffer-=hcec->RxXferSize;
hcec->RxXferSize = 0U;
hcec->RxState = HAL_CEC_STATE_READY;
}
else if (((reg & (CEC_ISR_TXUDR|CEC_ISR_TXERR|CEC_ISR_TXACKE)) != RESET) && ((reg & CEC_ISR_ARBLST) == RESET))
{
/* Set the CEC state ready to be able to start again the process */
hcec->gState = HAL_CEC_STATE_READY;
}
/* Error Call Back */
HAL_CEC_ErrorCallback(hcec);
}
}
/**
* @brief Send data in interrupt mode
* @param hcec: CEC handle
* @param DestinationAddress: destination logical address
* @param pData: pointer to input byte data buffer
* @param Size: amount of data to be sent in bytes (without counting the header).
* 0 means only the header is sent (ping operation).
* Maximum TX size is 15 bytes (1 opcode and up to 14 operands).
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CEC_Transmit_IT(CEC_HandleTypeDef *hcec, uint8_t DestinationAddress, uint8_t *pData, uint32_t Size)
{
uint8_t temp = 0;
/* if the IP isn't already busy and if there is no previous transmission
already pending due to arbitration lost */
if (((hcec->State == HAL_CEC_STATE_READY) || (hcec->State == HAL_CEC_STATE_STANDBY_RX))
&& (__HAL_CEC_GET_TRANSMISSION_START_FLAG(hcec) == RESET))
{
if((pData == NULL ) && (Size > 0))
{
hcec->State = HAL_CEC_STATE_ERROR;
return HAL_ERROR;
}
assert_param(IS_CEC_ADDRESS(DestinationAddress));
assert_param(IS_CEC_MSGSIZE(Size));
/* Process Locked */
__HAL_LOCK(hcec);
hcec->pTxBuffPtr = pData;
hcec->State = HAL_CEC_STATE_BUSY_TX;
hcec->ErrorCode = HAL_CEC_ERROR_NONE;
/* Disable Peripheral to write CEC_IER register */
__HAL_CEC_DISABLE(hcec);
/* Enable the following two CEC Transmission interrupts as
* well as the following CEC Transmission Errors interrupts:
* Tx Byte Request IT
* End of Transmission IT
* Tx Missing Acknowledge IT
* Tx-Error IT
* Tx-Buffer Underrun IT
* Tx arbitration lost */
__HAL_CEC_ENABLE_IT(hcec, CEC_IT_TXBR|CEC_IT_TXEND|CEC_IER_TX_ALL_ERR);
/* Enable the Peripheral */
__HAL_CEC_ENABLE(hcec);
/* initialize the number of bytes to send,
* 0 means only one header is sent (ping operation) */
hcec->TxXferCount = Size;
/* Process Unlocked */
__HAL_UNLOCK(hcec);
/* in case of no payload (Size = 0), sender is only pinging the system;
* Set TX End of Message (TXEOM) bit, must be set before writing data to TXDR */
if (Size == 0)
{
__HAL_CEC_LAST_BYTE_TX_SET(hcec);
}
/* send header block */
temp = ((uint32_t)hcec->Init.InitiatorAddress << CEC_INITIATOR_LSB_POS) | DestinationAddress;
hcec->Instance->TXDR = temp;
/* Set TX Start of Message (TXSOM) bit */
__HAL_CEC_FIRST_BYTE_TX_SET(hcec);
return HAL_OK;
}
/* if the IP is already busy or if there is a previous transmission
already pending due to arbitration loss */
else if ((hcec->State == HAL_CEC_STATE_BUSY_TX)
|| (__HAL_CEC_GET_TRANSMISSION_START_FLAG(hcec) != RESET))
{
__HAL_LOCK(hcec);
/* set state to BUSY TX, in case it wasn't set already (case
* of transmission new attempt after arbitration loss) */
if (hcec->State != HAL_CEC_STATE_BUSY_TX)
{
hcec->State = HAL_CEC_STATE_BUSY_TX;
}
/* if all data have been sent */
if(hcec->TxXferCount == 0)
{
/* Disable Peripheral to write CEC_IER register */
__HAL_CEC_DISABLE(hcec);
/* Disable the CEC Transmission Interrupts */
__HAL_CEC_DISABLE_IT(hcec, CEC_IT_TXBR|CEC_IT_TXEND);
/* Disable the CEC Transmission Error Interrupts */
__HAL_CEC_DISABLE_IT(hcec, CEC_IER_TX_ALL_ERR);
/* Enable the Peripheral */
__HAL_CEC_ENABLE(hcec);
__HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_TXBR|CEC_FLAG_TXEND);
hcec->State = HAL_CEC_STATE_READY;
/* Call the Process Unlocked before calling the Tx call back API to give the possibility to
start again the Transmission under the Tx call back API */
__HAL_UNLOCK(hcec);
HAL_CEC_TxCpltCallback(hcec);
return HAL_OK;
}
else
{
if (hcec->TxXferCount == 1)
{
/* if this is the last byte transmission, set TX End of Message (TXEOM) bit */
__HAL_CEC_LAST_BYTE_TX_SET(hcec);
}
/* clear Tx-Byte request flag */
__HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_TXBR);
hcec->Instance->TXDR = *hcec->pTxBuffPtr++;
hcec->TxXferCount--;
/* Process Unlocked */
__HAL_UNLOCK(hcec);
return HAL_OK;
}
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Send data in blocking mode
* @param hcec: CEC handle
* @param DestinationAddress: destination logical address
* @param pData: pointer to input byte data buffer
* @param Size: amount of data to be sent in bytes (without counting the header).
* 0 means only the header is sent (ping operation).
* Maximum TX size is 15 bytes (1 opcode and up to 14 operands).
* @param Timeout: Timeout duration.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CEC_Transmit(CEC_HandleTypeDef *hcec, uint8_t DestinationAddress, uint8_t *pData, uint32_t Size, uint32_t Timeout)
{
uint8_t temp = 0;
uint32_t tempisr = 0;
uint32_t tickstart = 0;
if((hcec->State == HAL_CEC_STATE_READY) && (__HAL_CEC_GET_TRANSMISSION_START_FLAG(hcec) == RESET))
{
hcec->ErrorCode = HAL_CEC_ERROR_NONE;
if((pData == NULL ) && (Size > 0))
{
hcec->State = HAL_CEC_STATE_ERROR;
return HAL_ERROR;
}
assert_param(IS_CEC_ADDRESS(DestinationAddress));
assert_param(IS_CEC_MSGSIZE(Size));
/* Process Locked */
__HAL_LOCK(hcec);
hcec->State = HAL_CEC_STATE_BUSY_TX;
hcec->TxXferCount = Size;
/* case no data to be sent, sender is only pinging the system */
if (Size == 0)
{
/* Set TX End of Message (TXEOM) bit, must be set before writing data to TXDR */
__HAL_CEC_LAST_BYTE_TX_SET(hcec);
}
/* send header block */
temp = ((uint32_t)hcec->Init.InitiatorAddress << CEC_INITIATOR_LSB_POS) | DestinationAddress;
hcec->Instance->TXDR = temp;
/* Set TX Start of Message (TXSOM) bit */
__HAL_CEC_FIRST_BYTE_TX_SET(hcec);
while (hcec->TxXferCount > 0)
{
hcec->TxXferCount--;
tickstart = HAL_GetTick();
while(HAL_IS_BIT_CLR(hcec->Instance->ISR, CEC_FLAG_TXBR))
{
if(Timeout != HAL_MAX_DELAY)
{
if((Timeout == 0) || ((HAL_GetTick() - tickstart) > Timeout))
{
hcec->State = HAL_CEC_STATE_TIMEOUT;
/* Process Unlocked */
__HAL_UNLOCK(hcec);
return HAL_TIMEOUT;
}
}
/* check whether error occurred while waiting for TXBR to be set:
* has Tx underrun occurred ?
* has Tx error occurred ?
* has Tx Missing Acknowledge error occurred ?
* has Arbitration Loss error occurred ? */
tempisr = hcec->Instance->ISR;
if ((tempisr & (CEC_FLAG_TXUDR|CEC_FLAG_TXERR|CEC_FLAG_TXACKE|CEC_FLAG_ARBLST)) != 0)
{
/* copy ISR for error handling purposes */
hcec->ErrorCode = tempisr;
/* clear all error flags by default */
__HAL_CEC_CLEAR_FLAG(hcec, (CEC_FLAG_TXUDR|CEC_FLAG_TXERR|CEC_FLAG_TXACKE|CEC_FLAG_ARBLST));
hcec->State = HAL_CEC_STATE_ERROR;
__HAL_UNLOCK(hcec);
return HAL_ERROR;
}
}
/* TXBR to clear BEFORE writing TXDR register */
__HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_TXBR);
if (hcec->TxXferCount == 0)
{
/* if last byte transmission, set TX End of Message (TXEOM) bit */
__HAL_CEC_LAST_BYTE_TX_SET(hcec);
}
hcec->Instance->TXDR = *pData++;
/* error check after TX byte write up */
tempisr = hcec->Instance->ISR;
if ((tempisr & (CEC_FLAG_TXUDR|CEC_FLAG_TXERR|CEC_FLAG_TXACKE|CEC_FLAG_ARBLST)) != 0)
{
/* copy ISR for error handling purposes */
hcec->ErrorCode = tempisr;
/* clear all error flags by default */
__HAL_CEC_CLEAR_FLAG(hcec, (CEC_FLAG_TXUDR|CEC_FLAG_TXERR|CEC_FLAG_TXACKE|CEC_FLAG_ARBLST));
hcec->State = HAL_CEC_STATE_ERROR;
__HAL_UNLOCK(hcec);
return HAL_ERROR;
}
} /* end while (while (hcec->TxXferCount > 0)) */
/* if no error up to this point, check that transmission is
* complete, that is wait until TXEOM is reset */
tickstart = HAL_GetTick();
while (HAL_IS_BIT_SET(hcec->Instance->CR, CEC_CR_TXEOM))
{
if(Timeout != HAL_MAX_DELAY)
{
if((Timeout == 0) || ((HAL_GetTick() - tickstart) > Timeout))
{
hcec->State = HAL_CEC_STATE_ERROR;
__HAL_UNLOCK(hcec);
return HAL_TIMEOUT;
}
}
}
/* Final error check once all bytes have been transmitted */
tempisr = hcec->Instance->ISR;
if ((tempisr & (CEC_FLAG_TXUDR|CEC_FLAG_TXERR|CEC_FLAG_TXACKE)) != 0)
{
/* copy ISR for error handling purposes */
hcec->ErrorCode = tempisr;
/* clear all error flags by default */
__HAL_CEC_CLEAR_FLAG(hcec, (CEC_FLAG_TXUDR|CEC_FLAG_TXERR|CEC_FLAG_TXACKE));
hcec->State = HAL_CEC_STATE_ERROR;
__HAL_UNLOCK(hcec);
return HAL_ERROR;
}
hcec->State = HAL_CEC_STATE_READY;
__HAL_UNLOCK(hcec);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
