/**
* @brief UART common service routine.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void uart_serve_interrupt(UARTDriver *uartp)
{
uint32_t dmachis = HWREG(UDMA_CHIS);
uint32_t mis = HWREG(uartp->uart + UART_O_MIS);
if (mis & UART_MIS_TXMIS) {
/* End of transfer */
_uart_tx2_isr_code(uartp);
}
if (mis & (UART_MIS_OEMIS | UART_MIS_BEMIS | UART_MIS_PEMIS | UART_MIS_FEMIS)) {
/* Error occurred */
_uart_rx_error_isr_code(uartp, translate_errors(mis));
}
if (dmachis & (1 << uartp->dmarxnr)) {
if (uartp->rxstate == UART_RX_IDLE) {
/* Receiver in idle state, a callback is generated, if enabled, for each
received character and then the driver stays in the same state.*/
_uart_rx_idle_code(uartp);
uart_enter_rx_idle_loop(uartp);
}
else {
/* Receiver in active state, a callback is generated, if enabled, after
a completed transfer.*/
_uart_rx_complete_isr_code(uartp);
}
}
if (dmachis & (1 << uartp->dmatxnr)) {
/* A callback is generated, if enabled, after a completed transfer.*/
_uart_tx1_isr_code(uartp);
}
}
/**
* @brief USART common service routine.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void serve_usart_irq(UARTDriver *uartp) {
uint32_t isr;
USART_TypeDef *u = uartp->usart;
uint32_t cr1 = u->CR1;
/* Reading and clearing status.*/
isr = u->ISR;
u->ICR = isr;
if (isr & (USART_ISR_LBDF | USART_ISR_ORE | USART_ISR_NE |
USART_ISR_FE | USART_ISR_PE)) {
_uart_rx_error_isr_code(uartp, translate_errors(isr));
}
if ((isr & USART_ISR_TC) && (cr1 & USART_CR1_TCIE)) {
/* TC interrupt disabled.*/
u->CR1 = cr1 & ~USART_CR1_TCIE;
/* End of transmission, a callback is generated.*/
_uart_tx2_isr_code(uartp);
}
}
/**
* @brief USART common service routine.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void serve_usart_irq(UARTDriver *uartp) {
uint16_t sr;
USART_TypeDef *u = uartp->usart;
uint32_t cr1 = u->CR1;
sr = u->SR; /* SR reset step 1.*/
(void)u->DR; /* SR reset step 2.*/
if (sr & (USART_SR_LBD | USART_SR_ORE | USART_SR_NE |
USART_SR_FE | USART_SR_PE)) {
u->SR = ~USART_SR_LBD;
_uart_rx_error_isr_code(uartp, translate_errors(sr));
}
if ((sr & USART_SR_TC) && (cr1 & USART_CR1_TCIE)) {
/* TC interrupt cleared and disabled.*/
u->SR = ~USART_SR_TC;
u->CR1 = cr1 & ~USART_CR1_TCIE;
/* End of transmission, a callback is generated.*/
_uart_tx2_isr_code(uartp);
}
}