/**
* @brief USART initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void usart_start(UARTDriver *uartp) {
uint32_t cr1;
USART_TypeDef *u = uartp->usart;
/* Defensive programming, starting from a clean state.*/
usart_stop(uartp);
/* Baud rate setting.*/
u->BRR = (uint32_t)(uartp->clock / uartp->config->speed);
/* Resetting eventual pending status flags.*/
u->ICR = 0xFFFFFFFFU;
/* Note that some bits are enforced because required for correct driver
operations.*/
u->CR2 = uartp->config->cr2 | USART_CR2_LBDIE;
u->CR3 = uartp->config->cr3 | USART_CR3_DMAT | USART_CR3_DMAR |
USART_CR3_EIE;
/* Mustn't ever set TCIE here - if done, it causes an immediate
interrupt.*/
cr1 = USART_CR1_UE | USART_CR1_PEIE | USART_CR1_TE | USART_CR1_RE;
u->CR1 = uartp->config->cr1 | cr1;
/* Starting the receiver idle loop.*/
set_rx_idle_loop(uartp);
}
/**
* @brief Deactivates the UART peripheral.
*
* @param[in] uartp pointer to the @p UARTDriver object
*
* @notapi
*/
void uart_lld_stop(UARTDriver *uartp) {
if (uartp->state == UART_READY) {
usart_stop(uartp);
dmaStreamRelease(uartp->dmarx);
dmaStreamRelease(uartp->dmatx);
#if STM32_UART_USE_USART1
if (&UARTD1 == uartp) {
nvicDisableVector(STM32_USART1_NUMBER);
rccDisableUSART1(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART2
if (&UARTD2 == uartp) {
nvicDisableVector(STM32_USART2_NUMBER);
rccDisableUSART2(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART3
if (&UARTD3 == uartp) {
nvicDisableVector(STM32_USART3_NUMBER);
rccDisableUSART3(FALSE);
return;
}
#endif
}
}
/**
* @brief USART initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void usart_start(UARTDriver *uartp) {
uint16_t cr1;
USART_TypeDef *u = uartp->usart;
/* Defensive programming, starting from a clean state.*/
usart_stop(uartp);
/* Baud rate setting.*/
if (uartp->usart == USART1)
u->BRR = STM32_PCLK2 / uartp->config->speed;
else
u->BRR = STM32_PCLK1 / uartp->config->speed;
/* Resetting eventual pending status flags.*/
(void)u->SR; /* SR reset step 1.*/
(void)u->DR; /* SR reset step 2.*/
u->SR = 0;
/* Note that some bits are enforced because required for correct driver
operations.*/
if (uartp->config->txend2_cb == NULL)
cr1 = USART_CR1_UE | USART_CR1_PEIE | USART_CR1_TE | USART_CR1_RE;
else
cr1 = USART_CR1_UE | USART_CR1_PEIE | USART_CR1_TE | USART_CR1_RE |
USART_CR1_TCIE;
u->CR1 = uartp->config->cr1 | cr1;
u->CR2 = uartp->config->cr2 | USART_CR2_LBDIE;
u->CR3 = uartp->config->cr3 | USART_CR3_DMAT | USART_CR3_DMAR |
USART_CR3_EIE;
/* Starting the receiver idle loop.*/
set_rx_idle_loop(uartp);
}
/**
* @brief USART initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void usart_start(UARTDriver *uartp) {
uint16_t cr1;
USART_TypeDef *u = uartp->usart;
/* Defensive programming, starting from a clean state.*/
usart_stop(uartp);
/* Baud rate setting.*/
#if STM32_HAS_USART6
if ((uartp->usart == USART1) || (uartp->usart == USART6))
#else
if (uartp->usart == USART1)
#endif
u->BRR = STM32_PCLK2 / uartp->config->speed;
else
u->BRR = STM32_PCLK1 / uartp->config->speed;
/* Resetting eventual pending status flags.*/
(void)u->SR; /* SR reset step 1.*/
(void)u->DR; /* SR reset step 2.*/
u->SR = 0;
/* Note that some bits are enforced because required for correct driver
operations.*/
u->CR2 = uartp->config->cr2 | USART_CR2_LBDIE;
u->CR3 = uartp->config->cr3 | USART_CR3_DMAT | USART_CR3_DMAR |
USART_CR3_EIE;
/* Mustn't ever set TCIE here - if done, it causes an immediate
interrupt.*/
cr1 = USART_CR1_UE | USART_CR1_PEIE | USART_CR1_TE | USART_CR1_RE;
u->CR1 = uartp->config->cr1 | cr1;
/* Starting the receiver idle loop.*/
uart_enter_rx_idle_loop(uartp);
}
/**
* @brief Deactivates the UART peripheral.
*
* @param[in] uartp pointer to the @p UARTDriver object
*
* @notapi
*/
void uart_lld_stop(UARTDriver *uartp) {
if (uartp->state == UART_READY) {
usart_stop(uartp);
dmaStreamRelease(uartp->dmarx);
dmaStreamRelease(uartp->dmatx);
#if STM32_UART_USE_USART1
if (&UARTD1 == uartp) {
nvicDisableVector(STM32_USART1_NUMBER);
rccDisableUSART1(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART2
if (&UARTD2 == uartp) {
nvicDisableVector(STM32_USART2_NUMBER);
rccDisableUSART2(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART3
if (&UARTD3 == uartp) {
nvicDisableVector(STM32_USART3_NUMBER);
rccDisableUSART3(FALSE);
return;
}
#endif
#if STM32_UART_USE_UART4
if (&UARTD4 == uartp) {
nvicDisableVector(STM32_UART4_NUMBER);
rccDisableUART4(FALSE);
return;
}
#endif
#if STM32_UART_USE_UART5
if (&UARTD5 == uartp) {
nvicDisableVector(STM32_UART5_NUMBER);
rccDisableUART5(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART6
if (&UARTD6 == uartp) {
nvicDisableVector(STM32_USART6_NUMBER);
rccDisableUSART6(FALSE);
return;
}
#endif
#if STM32_UART_USE_UART7
if (&UARTD7 == uartp) {
nvicDisableVector(STM32_UART7_NUMBER);
rccDisableUART7(FALSE);
return;
}
#endif
#if STM32_UART_USE_UART8
if (&UARTD8 == uartp) {
nvicDisableVector(STM32_UART8_NUMBER);
rccDisableUART8(FALSE);
return;
}
#endif
}
}
