[stm32 drv usart] 修复串口发送第一个字节丢失的问题。| Fixed a problem where the first byte of a serial port was lost.

bsp/stm32f0x/drivers/usart.c

@@ -97,8 +97,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
-    while (!(uart->uart_device->ISR & USART_FLAG_TXE));
+    USART_ClearFlag(uart->uart_device,USART_FLAG_TC);
     uart->uart_device->TDR = c;
+    while (!(uart->uart_device->ISR & USART_FLAG_TC));
 
     return 1;
 }

bsp/stm32f107/drivers/usart.c

@@ -124,6 +124,7 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
+    USART_ClearFlag(uart->uart_device,USART_FLAG_TC);
     uart->uart_device->DR = c;
     while (!(uart->uart_device->SR & USART_FLAG_TC));
 

bsp/stm32f10x-HAL/drivers/drv_usart.c

@@ -113,8 +113,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     struct stm32_uart *uart;
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
-    while (__HAL_UART_GET_FLAG(&uart->huart, UART_FLAG_TXE) == RESET);
+    __HAL_UART_CLEAR_FLAG(&(uart->huart), UART_FLAG_TC);
     uart->huart.Instance->DR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->huart), UART_FLAG_TC) == RESET);
     return 1;
 }
 

bsp/stm32f40x/drivers/usart.c

@@ -166,8 +166,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
-    while (!(uart->uart_device->SR & USART_FLAG_TXE));
+    USART_ClearFlag(uart->uart_device,USART_FLAG_TC);
     uart->uart_device->DR = c;
+    while (!(uart->uart_device->SR & USART_FLAG_TC));
 
     return 1;
 }

bsp/stm32f411-nucleo/drivers/drv_usart.c

@@ -155,8 +155,9 @@ static int drv_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct drv_uart *)serial->parent.user_data;
     
-    while((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->DR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
     return 1;
 }
 

bsp/stm32f429-apollo/drivers/usart.c

@@ -185,8 +185,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
-    while((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->DR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
     return 1;
 }
 

bsp/stm32f429-armfly/drivers/usart.c

@@ -185,8 +185,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
-    while((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->DR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
     return 1;
 }
 

bsp/stm32f429-disco/drivers/usart.c

@@ -185,8 +185,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
-    while((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->DR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
     return 1;
 }
 

bsp/stm32f4xx-HAL/drivers/drv_usart.c

@@ -122,8 +122,9 @@ static int drv_putc(struct rt_serial_device *serial, char c)
     struct drv_uart *uart;
     RT_ASSERT(serial != RT_NULL);
     uart = (struct drv_uart *)serial->parent.user_data;
-    while ((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->DR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
     return 1;
 }
 

bsp/stm32f7-disco/drivers/drv_usart.c

@@ -106,7 +106,7 @@ static int drv_putc(struct rt_serial_device *serial, char c)
     struct drv_uart *uart;
     RT_ASSERT(serial != RT_NULL);
     uart = (struct drv_uart *)serial->parent.user_data;
-    while ((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->TDR = c;
     return 1;
 }

bsp/stm32h743-nucleo/drivers/drv_usart.c

@@ -138,8 +138,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
-    while (!(uart->UartHandle.Instance->ISR & UART_FLAG_TXE));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->TDR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
 
     return 1;
 }

bsp/stm32l475-iot-disco/drivers/usart.c

@@ -185,8 +185,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
 
-    while((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->TDR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
     return 1;
 }
 

bsp/stm32l476-nucleo/drivers/drv_usart.c

@@ -141,8 +141,9 @@ static int drv_putc(struct rt_serial_device *serial, char c)
 
     uart = (struct drv_uart *)serial->parent.user_data;
 
-    while ((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_TXE) == RESET));
+    __HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
     uart->UartHandle.Instance->TDR = c;
+    while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
 
     return 1;
 }