/** The asynchronous TX and RX handler.
*
* @param obj The serial object
* @return Returns event flags if an RX transfer termination condition was met; otherwise returns 0
*/
int serial_irq_handler_asynch(serial_t *obj)
{
struct serial_s *p_obj = GET_SERIAL_S(obj);
volatile uint8_t i = 0;
volatile int return_val = 0;
uint8_t *p_buf = (uint8_t *)(obj->rx_buff.buffer);
if (usart_interrupt_flag_get(p_obj->uart, USART_INT_FLAG_PERR) != RESET) {
/* clear PERR error flag by reading USART DATA register */
USART_DATA(p_obj->uart);
return_val |= (SERIAL_EVENT_RX_PARITY_ERROR & p_obj->events);
p_obj->error_code |= USART_ERROR_CODE_PERR;
}
if (usart_interrupt_flag_get(p_obj->uart, USART_INT_FLAG_ERR_FERR) != RESET) {
/* clear FERR error flag by reading USART DATA register */
USART_DATA(p_obj->uart);
return_val |= (SERIAL_EVENT_RX_FRAMING_ERROR & p_obj->events);
p_obj->error_code |= USART_ERROR_CODE_FERR;
}
if (usart_interrupt_flag_get(p_obj->uart, USART_INT_FLAG_ERR_ORERR) != RESET) {
/* clear ORERR error flag by reading USART DATA register */
USART_DATA(p_obj->uart);
return_val |= (SERIAL_EVENT_RX_OVERRUN_ERROR & p_obj->events);
p_obj->error_code |= USART_ERROR_CODE_ORERR;
}
if (return_val & (SERIAL_EVENT_RX_PARITY_ERROR | SERIAL_EVENT_RX_FRAMING_ERROR |
SERIAL_EVENT_RX_OVERRUN_ERROR)) {
return return_val;
}
if (usart_interrupt_flag_get(p_obj->uart, USART_INT_FLAG_TC) != RESET) {
if ((p_obj->events & SERIAL_EVENT_TX_COMPLETE) != 0) {
return_val |= (SERIAL_EVENT_TX_COMPLETE & p_obj->events);
}
}
usart_irq_handler(p_obj);
if (p_obj->rx_size != 0) {
obj->rx_buff.pos = p_obj->rx_size - p_obj->rx_count;
}
if ((p_obj->rx_count == 0) && (obj->rx_buff.pos >= (obj->rx_buff.length - 1))) {
return_val |= (SERIAL_EVENT_RX_COMPLETE & p_obj->events);
}
if (p_obj->events & SERIAL_EVENT_RX_CHARACTER_MATCH) {
if (p_buf != NULL) {
for (i = 0; i < obj->rx_buff.pos; i++) {
if (p_buf[i] == obj->char_match) {
obj->rx_buff.pos = i;
return_val |= (SERIAL_EVENT_RX_CHARACTER_MATCH & p_obj->events);
serial_rx_abort_asynch(obj);
break;
}
}
}
}
return return_val;
}
void usart5_irq_handler(void) { usart_irq_handler(&uart5); }
void usart2_irq_handler(void) { usart_irq_handler(&uart2); }
void usart3_irq_handler(void) { usart_irq_handler(&uart3); }
void usart1_irq_handler(void) { usart_irq_handler(&uart1); }