Commit 53521152 authored by Damien George's avatar Damien George
Browse files

stmhal: L4: Modify uart.c to support L4 MCU.

L4 does not have UART6, and has similar registers to the F7.

Original patch was authored by Tobias Badertscher / @tobbad, but it was
reworked to split UART edits from USB edits.
parent 8007f84c
......@@ -150,7 +150,6 @@ STATIC bool uart_init2(pyb_uart_obj_t *uart_obj) {
#endif
#if defined(MICROPY_HW_UART2_PORT) && defined(MICROPY_HW_UART2_PINS)
// USART2 is on PA2/PA3 (CTS,RTS,CK on PA0,PA1,PA4), PD5/PD6 (CK on PD7)
case PYB_UART_2:
UARTx = USART2;
irqn = USART2_IRQn;
......@@ -327,7 +326,7 @@ int uart_rx_char(pyb_uart_obj_t *self) {
return data;
} else {
// no buffering
#if defined(MCU_SERIES_F7)
#if defined(MCU_SERIES_F7) || defined(MCU_SERIES_L4)
return self->uart.Instance->RDR & self->char_mask;
#else
return self->uart.Instance->DR & self->char_mask;
......@@ -398,7 +397,7 @@ void uart_irq_handler(mp_uint_t uart_id) {
uint16_t next_head = (self->read_buf_head + 1) % self->read_buf_len;
if (next_head != self->read_buf_tail) {
// only read data if room in buf
#if defined(MCU_SERIES_F7)
#if defined(MCU_SERIES_F7) || defined(MCU_SERIES_L4)
int data = self->uart.Instance->RDR; // clears UART_FLAG_RXNE
#else
int data = self->uart.Instance->DR; // clears UART_FLAG_RXNE
......@@ -571,12 +570,20 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
// compute actual baudrate that was configured
// (this formula assumes UART_OVERSAMPLING_16)
uint32_t actual_baudrate;
if (self->uart.Instance == USART1 || self->uart.Instance == USART6) {
if (self->uart.Instance == USART1
#if defined(USART6)
|| self->uart.Instance == USART6
#endif
) {
actual_baudrate = HAL_RCC_GetPCLK2Freq();
} else {
actual_baudrate = HAL_RCC_GetPCLK1Freq();
}
#if defined(MCU_SERIES_L4)
actual_baudrate = (actual_baudrate << 5) / (self->uart.Instance->BRR >> 3);
#else
actual_baudrate /= self->uart.Instance->BRR;
#endif
// check we could set the baudrate within 5%
uint32_t baudrate_diff;
......@@ -716,11 +723,13 @@ STATIC mp_obj_t pyb_uart_deinit(mp_obj_t self_in) {
__UART5_RELEASE_RESET();
__UART5_CLK_DISABLE();
#endif
#if defined(UART6)
} else if (uart->Instance == USART6) {
HAL_NVIC_DisableIRQ(USART6_IRQn);
__USART6_FORCE_RESET();
__USART6_RELEASE_RESET();
__USART6_CLK_DISABLE();
#endif
}
return mp_const_none;
}
......@@ -776,7 +785,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_uart_readchar_obj, pyb_uart_readchar);
// uart.sendbreak()
STATIC mp_obj_t pyb_uart_sendbreak(mp_obj_t self_in) {
pyb_uart_obj_t *self = self_in;
#if defined(MCU_SERIES_F7)
#if defined(MCU_SERIES_F7) || defined(MCU_SERIES_L4)
self->uart.Instance->RQR = USART_RQR_SBKRQ; // write-only register
#else
self->uart.Instance->CR1 |= USART_CR1_SBK;
......
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