diff options
| -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) |