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Use UART receiver timeout for data reception. #299

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Merged
lihuanhuan merged 1 commit into from
Apr 18, 2025
Merged

Use UART receiver timeout for data reception. #299

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16 changes: 11 additions & 5 deletions core/embed/trezorhal/usart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,10 @@
#include "irq.h"
#include "usart.h"

#define USART_TIMEOUT 0x100000
#define BAUD_RATE 115200
#define UART_ONE_BIT_TIME_US (1000000 / BAUD_RATE)
// max timeout is 0xffffffff * UART_ONE_BIT_TIME_US
#define UART_TIMEOUT_MS (2)

UART_HandleTypeDef uart;
UART_HandleTypeDef *huart = &uart;
Expand Down Expand Up @@ -60,7 +63,7 @@ void ble_usart_init(void) {
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

huart->Instance = UART4;
huart->Init.BaudRate = 115200;
huart->Init.BaudRate = BAUD_RATE;
huart->Init.WordLength = UART_WORDLENGTH_8B;
huart->Init.StopBits = UART_STOPBITS_1;
huart->Init.Parity = UART_PARITY_NONE;
Expand Down Expand Up @@ -122,7 +125,10 @@ void ble_usart_init(void) {
HAL_NVIC_ClearPendingIRQ(UART4_IRQn);
HAL_NVIC_EnableIRQ(UART4_IRQn);

__HAL_UART_ENABLE_IT(huart, UART_IT_IDLE);
HAL_UART_EnableReceiverTimeout(huart);
HAL_UART_ReceiverTimeout_Config(
huart, (UART_TIMEOUT_MS * 1000) / UART_ONE_BIT_TIME_US);
__HAL_UART_ENABLE_IT(huart, UART_IT_RTO);
HAL_UART_Receive_DMA(huart, dma_uart_rev_buf, sizeof(dma_uart_rev_buf));
}

Expand Down Expand Up @@ -276,8 +282,8 @@ void UART4_IRQHandler(void) {
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_WUF)) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_WUF);
}
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_IDLE)) {
__HAL_UART_CLEAR_FLAG(huart, UART_FLAG_IDLE);
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_RTOF)) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_RTOF);
HAL_UART_Abort(huart);
usart_fifo_len =
sizeof(dma_uart_rev_buf) - __HAL_DMA_GET_COUNTER(huart->hdmarx);
Expand Down
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