/*****************************************************************************
*
* Description:
* Non-blocking receive function.
*
* Params:
* [in] pRxChar - Pointer to buffer where the received character shall
* be placed.
*
* Return:
* TRUE if character was received, else FALSE.
*
****************************************************************************/
tU8
uart1GetChar(tU8 *pRxChar)
{
volatile tU32 cpsrReg;
tU32 tmpTail;
/* buffer is empty */
if(uart1RxHead == uart1RxTail)
return FALSE;
tmpTail = (uart1RxTail + 1) & RX_BUFFER_MASK;
uart1RxTail = tmpTail;
*pRxChar = uart1RxBuf[tmpTail];
//disable IRQ
cpsrReg = disIrq();
uart1RxInBuff--;
if(uart1RxInBuff == (RX_BUFFER_SIZE - RX_BUFFER_LIMIT))
{
//pull RTS high = accept bytes from other side again
UART1_MCR = 0x02;
}
//enable IRQ
restoreIrq(cpsrReg);
return TRUE;
}
/*****************************************************************************
*
* Description:
* Blocking output routine, i.e., the routine waits until the uart
* buffer is free and then sends the character.
*
* Params:
* [in] charToSend - The character to print (to uart #1)
*
****************************************************************************/
void
uart1SendChar(tU8 charToSend)
{
volatile tU32 cpsrReg;
tU32 tmpHead;
//calculate head index
tmpHead = (uart1TxHead + 1) & TX_BUFFER_MASK;
//wait for free space in buffer
while(tmpHead == uart1TxTail)
;
//disable IRQ
cpsrReg = disIrq();
U1IER &= ~0x02; //disable TX IRQ
//enable IRQ
restoreIrq(cpsrReg);
if(uart1TxRunning == TRUE)
{
uart1TxBuf[tmpHead] = charToSend;
uart1TxHead = tmpHead;
}
else
{
uart1TxRunning = TRUE;
U1THR = charToSend;
}
//disable IRQ
cpsrReg = disIrq();
U1IER |= 0x02; //enable TX IRQ
//enable IRQ
restoreIrq(cpsrReg);
}
