Update drv_usart_v2.c

修复stm32h7开启DCache之后，串口dma发送数据不同步的bug
RT-Thread · Dec 8, 2024 · 060f9c4 · 060f9c4
1 parent ec900a7
commit 060f9c4
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/bsp/stm32/libraries/HAL_Drivers/drivers/drv_usart_v2.c b/bsp/stm32/libraries/HAL_Drivers/drivers/drv_usart_v2.c
@@ -390,6 +390,10 @@ static rt_ssize_t stm32_transmit(struct rt_serial_device     *serial,
 
     if (uart->uart_dma_flag & RT_DEVICE_FLAG_DMA_TX)
     {
+#if defined (__DCACHE_PRESENT) && (__DCACHE_PRESENT == 1U)
+        struct rt_serial_tx_fifo *tx_fifo = (struct rt_serial_tx_fifo *) serial->serial_tx;
+        SCB_CleanDCache_by_Addr((uint32_t *)tx_fifo->rb.buffer_ptr, tx_fifo->rb.buffer_size);
+#endif    
         HAL_UART_Transmit_DMA(&uart->handle, buf, size);
         return size;
     }