/*********************************************************************************//*!
* \brief Get a character from the reception ring buffer.
*
* The retrieved character if available is stored using pointer pcRxedChar. The function
* returns pdTRUE if a character was available and pdFALSE otherwise (in this latter case, the contents
* referenced by pcRxedChar are not changed).
* @param usartId - USART identifier
* @param pcRxedChar - pointer for storing character read.
* @return pdFALSE if a character was available in the reception ring buffer (stored at pcRXedChar) and pdFALSE otherwise.
*/
UBaseType_t usart_xgetChar( USART_ID usartId, UBaseType_t *pcRxedChar )
{
UBaseType_t retVal = pdFALSE;
// Get the next character from the ring buffer. Return false if no characters are available
if( ! ringBuffer_IsEmpty( &(usartComBuf[usartId].xRxedChars) ) )
{
* pcRxedChar = ringBuffer_Pop( &(usartComBuf[usartId].xRxedChars) );
retVal = pdTRUE;
}
return retVal;
}
/***************************************************************************************//*!
* \private Interrupt service routine for character transmission.
* Transmits a character from the transmit ring buffer. If the buffer is empty, the transmit interrupt is disabled.
* @param usartId - USART id
******************************************************************************************/
void usart_tx_isr(USART_ID usartId)
{
if( ringBuffer_IsEmpty( &(usartComBuf[usartId].xCharsForTx) ) )
{
// Queue empty, nothing to send.
xmitInterrupt_Off(usartId);
}
else
{
*usartReg[usartId].udrPtr = ringBuffer_Pop( &(usartComBuf[usartId].xCharsForTx) );
}
}
inline portBASE_TYPE xSerialGetChar( xComPortHandlePtr pxPort, unsigned portBASE_TYPE *pcRxedChar )
{
/* Get the next character from the ring buffer. Return false if no characters are available */
if( ringBuffer_IsEmpty( &(pxPort->xRxedChars) ) )
{
return pdFALSE;
}
else
{
* pcRxedChar = ringBuffer_Pop( &(pxPort->xRxedChars) );
return pdTRUE;
}
}