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stm32/uart: Factor out code to set RX buffer to function uart_set_rxbuf.

This commit is contained in:
Damien George 2018-12-10 10:21:37 +11:00
parent 9690757cca
commit 7d7f59d78b
3 changed files with 20 additions and 11 deletions
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15
ports/stm32/machine_uart.c
View File

@ -223,25 +223,18 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, size_t n_args, const
}
self->char_width = CHAR_WIDTH_8BIT;
}
self->read_buf_head = 0;
self->read_buf_tail = 0;
if (args.rxbuf.u_int >= 0) {
// rxbuf overrides legacy read_buf_len
args.read_buf_len.u_int = args.rxbuf.u_int;
}
if (args.read_buf_len.u_int <= 0) {
// no read buffer
self->read_buf_len = 0;
self->read_buf = NULL;
HAL_NVIC_DisableIRQ(self->irqn);
__HAL_UART_DISABLE_IT(&self->uart, UART_IT_RXNE);
uart_set_rxbuf(self, 0, NULL);
} else {
// read buffer using interrupts
self->read_buf_len = args.read_buf_len.u_int + 1; // +1 to adjust for usable length of buffer
self->read_buf = m_new(byte, self->read_buf_len << self->char_width);
__HAL_UART_ENABLE_IT(&self->uart, UART_IT_RXNE);
NVIC_SetPriority(IRQn_NONNEG(self->irqn), IRQ_PRI_UART);
HAL_NVIC_EnableIRQ(self->irqn);
size_t len = args.read_buf_len.u_int + 1; // +1 to adjust for usable length of buffer
uint8_t *buf = m_new(byte, len << self->char_width);
uart_set_rxbuf(self, len, buf);
}
// compute actual baudrate that was configured

15
ports/stm32/uart.c
View File

@ -302,6 +302,21 @@ bool uart_init2(pyb_uart_obj_t *uart_obj) {
return true;
}
void uart_set_rxbuf(pyb_uart_obj_t *self, size_t len, void *buf) {
self->read_buf_head = 0;
self->read_buf_tail = 0;
self->read_buf_len = len;
self->read_buf = buf;
if (len == 0) {
HAL_NVIC_DisableIRQ(self->irqn);
__HAL_UART_DISABLE_IT(&self->uart, UART_IT_RXNE);
} else {
__HAL_UART_ENABLE_IT(&self->uart, UART_IT_RXNE);
NVIC_SetPriority(IRQn_NONNEG(self->irqn), IRQ_PRI_UART);
HAL_NVIC_EnableIRQ(self->irqn);
}
}
void uart_deinit(pyb_uart_obj_t *self) {
self->is_enabled = false;
UART_HandleTypeDef *uart = &self->uart;

1
ports/stm32/uart.h
View File

@ -64,6 +64,7 @@ void uart_init0(void);
void uart_deinit_all(void);
bool uart_exists(int uart_id);
bool uart_init2(pyb_uart_obj_t *uart_obj);
void uart_set_rxbuf(pyb_uart_obj_t *self, size_t len, void *buf);
void uart_deinit(pyb_uart_obj_t *uart_obj);
void uart_irq_handler(mp_uint_t uart_id);