diff options
| author | breederbai <[email protected]> | 2022-04-25 12:51:03 +0800 |
|---|---|---|
| committer | guo <[email protected]> | 2022-04-27 21:59:06 +0800 |
| commit | 429e1cafe6453af16f08ded4f1e13cc0c19100f7 (patch) | |
| tree | 8a75f76d60a05deda0e7830678e2dcde72f6b5c0 | |
| parent | 326abec0e7aa0553510ef83338a6cba4c7fd2d65 (diff) | |
修复BUG：串口启用DMA接收后，动态修改串口波特率扰乱接收检索
在串口不关闭的情况下，更改波特率后，清空上次数据检索，导致更新写入检索错误，
串口无法读出正确的数据。真实数据的位置和检索值之间总有一定的距离，导致读取
数据的时候会有一定的延时。缓冲区大，延时越长
| -rw-r--r-- | bsp/stm32/libraries/HAL_Drivers/drv_usart.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c index 6211676056..fe9cc3bdcf 100644 --- a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c +++ b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c @@ -169,7 +169,9 @@ static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_c } #ifdef RT_SERIAL_USING_DMA - uart->dma_rx.last_index = 0; + if (!(serial->parent.open_flag & RT_DEVICE_OFLAG_OPEN)) { + uart->dma_rx.last_index = 0; + } #endif if (HAL_UART_Init(&uart->handle) != HAL_OK) |