5 rt_thread的uart下如何支持9位数据的发送和接收？

发布于 2021-02-03 11:28:05 浏览：1495 订阅该版

4 个回答

Jone 2021-02-03

写了还是懒

Acuity 2021-02-03

这家伙很懒，什么也没写！

cheney 2021-02-04

这家伙很懒，什么也没写！

wandersky 2024-03-01

这家伙很懒，什么也没写！

```c
diff --git a/libraries/HAL_Drivers/drv_usart_v2.c b/libraries/HAL_Drivers/drv_usart_v2.c
index 02c92af..08d7d51 100644
--- a/libraries/HAL_Drivers/drv_usart_v2.c
+++ b/libraries/HAL_Drivers/drv_usart_v2.c
@@ -431,6 +431,8 @@ static void dma_recv_isr(struct rt_serial_device *serial, rt_uint8_t isr_flag)
 
     recv_len = 0;
     counter = __HAL_DMA_GET_COUNTER(&(uart->dma_rx.handle));
+    if(serial->config.data_bits == DATA_BITS_9)
+        counter = counter << 1;
 
     if (counter <= uart->dma_rx.remaining_cnt)
         recv_len = uart->dma_rx.remaining_cnt - counter;
@@ -521,7 +523,7 @@ static void uart_isr(struct rt_serial_device *serial)
     {
         if (__HAL_UART_GET_FLAG(&(uart->handle), UART_FLAG_ORE) != RESET)
         {
-            LOG_E("(%s) serial device Overrun error!", serial->parent.parent.name);
+            //LOG_E("(%s) serial device Overrun error!", serial->parent.parent.name);
             __HAL_UART_CLEAR_OREFLAG(&uart->handle);
         }
         if (__HAL_UART_GET_FLAG(&(uart->handle), UART_FLAG_NE) != RESET)
@@ -1233,8 +1235,18 @@ static void stm32_dma_config(struct rt_serial_device *serial, rt_ubase_t flag)
 #endif
     DMA_Handle->Init.PeriphInc           = DMA_PINC_DISABLE;
     DMA_Handle->Init.MemInc              = DMA_MINC_ENABLE;
-    DMA_Handle->Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
-    DMA_Handle->Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
+
+    if(serial->config.data_bits == DATA_BITS_9)
+    {
+        DMA_Handle->Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
+        DMA_Handle->Init.MemDataAlignment    = DMA_PDATAALIGN_HALFWORD;
+    }
+    else
+    {
+        DMA_Handle->Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
+        DMA_Handle->Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
+    }
+
 
     if (RT_DEVICE_FLAG_DMA_RX == flag)
     {
diff --git a/rt-thread b/rt-thread
--- a/rt-thread
+++ b/rt-thread
@@ -1 +1 @@
-Subproject commit c8fed39add3bf5ef18bc7755bb3284167046788d
+Subproject commit c8fed39add3bf5ef18bc7755bb3284167046788d-dirty

```

按上面的方法修改drv_usart.c，就可以了