/*********************************************************************//**
* @brief UART1 interrupt handler sub-routine
* @param[in] None
* @return None
**********************************************************************/
void UART1_IRQHandler(void)
{
uint8_t modemsts;
uint32_t intsrc, tmp, tmp1;
/* Determine the interrupt source */
intsrc = UART_GetIntId((LPC_UART_TypeDef *)LPC_UART1);
tmp = intsrc & UART_IIR_INTID_MASK;
/*
* In case of using UART1 with full modem,
* interrupt ID = 0 that means modem status interrupt has been detected
*/
if (tmp == 0){
// Check Modem status
modemsts = UART_FullModemGetStatus(LPC_UART1);
#if (AUTO_RTS_CTS_USE == 0)
// Check CTS status change flag
if (modemsts & UART1_MODEM_STAT_DELTA_CTS) {
// if CTS status is active, continue to send data
if (modemsts & UART1_MODEM_STAT_CTS) {
// Re-Enable Tx
UART_TxCmd((LPC_UART_TypeDef *)LPC_UART1, ENABLE);
}
// Otherwise, Stop current transmission immediately
else{
// Disable Tx
UART_TxCmd((LPC_UART_TypeDef *)LPC_UART1, DISABLE);
}
}
#endif
}
// Receive Line Status
if (tmp == UART_IIR_INTID_RLS){
// Check line status
tmp1 = UART_GetLineStatus((LPC_UART_TypeDef *)LPC_UART1);
// Mask out the Receive Ready and Transmit Holding empty status
tmp1 &= (UART_LSR_OE | UART_LSR_PE | UART_LSR_FE \
| UART_LSR_BI | UART_LSR_RXFE);
// If any error exist
if (tmp1) {
UART1_IntErr(tmp1);
}
}
// Receive Data Available or Character time-out
if ((tmp == UART_IIR_INTID_RDA) || (tmp == UART_IIR_INTID_CTI)){
UART1_IntReceive();
}
// Transmit Holding Empty
if (tmp == UART_IIR_INTID_THRE){
UART1_IntTransmit();
}
}
/*********************************************************************//**
* @brief UART transmit function for interrupt mode (using ring buffers)
* @param[in] UARTPort Selected UART peripheral used to send data,
* should be UART1.
* @param[out] txbuf Pointer to Transmit buffer
* @param[in] buflen Length of Transmit buffer
* @return Number of bytes actually sent to the ring buffer
**********************************************************************/
uint32_t UARTSend(LPC_UART_TypeDef *UARTPort, uint8_t *txbuf, uint8_t buflen)
{
uint8_t *data = (uint8_t *) txbuf;
uint32_t bytes = 0;
/* Temporarily lock out UART transmit interrupts during this
read so the UART transmit interrupt won't cause problems
with the index values */
UART_IntConfig(UARTPort, UART_INTCFG_THRE, DISABLE);
/* Loop until transmit run buffer is full or until n_bytes
expires */
while ((buflen > 0) && (!__BUF_IS_FULL(rb.tx_head, rb.tx_tail)))
{
/* Write data from buffer into ring buffer */
rb.tx[rb.tx_head] = *data;
data++;
/* Increment head pointer */
__BUF_INCR(rb.tx_head);
/* Increment data count and decrement buffer size count */
bytes++;
buflen--;
}
/*
* Check if current Tx interrupt enable is reset,
* that means the Tx interrupt must be re-enabled
* due to call UART_IntTransmit() function to trigger
* this interrupt type
*/
if (TxIntStat == RESET) {
UART1_IntTransmit();
}
/*
* Otherwise, re-enables Tx Interrupt
*/
else {
UART_IntConfig(UARTPort, UART_INTCFG_THRE, ENABLE);
}
return bytes;
}
