/**
  * @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 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))
  {
    __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 == 0U)
    {
      /* 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 == 1U)
      {
        /* 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 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)
{
  uint32_t tmp_state = 0;
  
  tmp_state = hcec->State;
  /* if the IP is already busy or if there is a previous transmission
     already pending due to arbitration loss */
  if(((tmp_state == HAL_CEC_STATE_BUSY_TX) || (tmp_state == HAL_CEC_STATE_BUSY_TX_RX))
        || (__HAL_CEC_GET_TRANSMISSION_START_FLAG(hcec) != RESET))
  {
    /* if all data have been sent */
    if(hcec->TxXferCount == 0)
    {
      /* Acknowledge successful completion by writing 0x00 */
      MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, 0x00);

      /* Check if a receive process is ongoing or not */
      if(hcec->State == HAL_CEC_STATE_BUSY_TX_RX) 
      {
        /* Interrupts are not disabled due to reception still ongoing */
        
        hcec->State = HAL_CEC_STATE_BUSY_RX;
      }
      else
      {
        /* Disable the CEC Transmission Interrupts */
        __HAL_CEC_DISABLE_IT(hcec, CEC_IT_IE);
      
        hcec->State = HAL_CEC_STATE_READY;
      }
      
      HAL_CEC_TxCpltCallback(hcec);
      
      return HAL_OK;
    }
    else
    {
      /* Reduce the number of bytes to transfer by one */
      hcec->TxXferCount--;
      
      /* Write data to TX buffer*/
      hcec->Instance->TXD = *hcec->pTxBuffPtr++;
      
      /* If this is the last byte of the ongoing transmission */
      if (hcec->TxXferCount == 0)
      {
        /* Acknowledge byte request and signal end of message */
        MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, CEC_FLAG_TEOM);
      }
      else
      {
        /* Acknowledge byte request by writing 0x00 */
        MODIFY_REG(hcec->Instance->CSR, CEC_FLAG_TRANSMIT_MASK, 0x00);
      }  
      
      return HAL_OK;
    }
  }
  else
  {
    return HAL_BUSY;   
  }
}
Esempio n. 4
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/**
  * @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_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);
     
      /* If RX interruptions are enabled, return to HAL_CEC_STATE_STANDBY_RX state */
      if (__HAL_CEC_GET_IT_SOURCE(hcec, (CEC_IT_RXBR|CEC_IT_RXEND) ) != RESET)
      {
        hcec->State = HAL_CEC_STATE_STANDBY_RX;
      }
      else
      {    
        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_FLAG_TXBR); 
       hcec->Instance->TXDR = *hcec->pTxBuffPtr++;
      hcec->TxXferCount--;
  
      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 error status register for further error handling purposes */
  hcec->ErrorCode = READ_BIT(hcec->Instance->ESR, CEC_ESR_ALL_ERROR);

  /* Transmit error */
  if((__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_TERR) != RESET))
  {
    /* Acknowledgement of the error */
    __HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_TERR);
    
    /* Check if a receive process is ongoing or not */
    if(hcec->State == HAL_CEC_STATE_BUSY_TX_RX) 
    {
      /* Interrupts are not disabled due to reception still ongoing */
      
      hcec->State = HAL_CEC_STATE_BUSY_RX;
    }
    else
    {
      /* Disable the CEC Transmission Interrupts */
      __HAL_CEC_DISABLE_IT(hcec, CEC_IT_IE);
    
      hcec->State = HAL_CEC_STATE_READY;
    }    
  }
  
  /* Receive error */
  if((__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_RERR) != RESET))
  {
    /* Acknowledgement of the error */
    __HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_RERR);
    
    /* Check if a transmit process is ongoing or not */
    if(hcec->State == HAL_CEC_STATE_BUSY_TX_RX) 
    {
      /* Interrupts are not disabled due to reception still ongoing */
      
      hcec->State = HAL_CEC_STATE_BUSY_TX;
    }
    else
    {
      /* Disable the CEC Transmission Interrupts */
      __HAL_CEC_DISABLE_IT(hcec, CEC_IT_IE);
      
      hcec->State = HAL_CEC_STATE_READY;
    }
  } 
  
  if ((hcec->ErrorCode & CEC_ESR_ALL_ERROR) != 0)
  {
    HAL_CEC_ErrorCallback(hcec);
  }
  
  /* Transmit byte request or block transfer finished */
  if((__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_TBTRF) != RESET))
  {
    CEC_Transmit_IT(hcec);
  }  

  /* Receive byte or block transfer finished */
  if((__HAL_CEC_GET_FLAG(hcec, CEC_FLAG_RBTF) != RESET))
  {
    CEC_Receive_IT(hcec);
  }
}