Merge pull request #4003 from mysterywolf/pr4

[bsp][stm32][bluepill] add USART2

Author: BernardXiong

bsp/stm32/stm32f103-blue-pill/board/CubeMX_Config/Src/stm32f1xx_hal_msp.c

@@ -222,9 +222,6 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
   GPIO_InitTypeDef GPIO_InitStruct = {0};
   if(huart->Instance==USART1)
   {
-  /* USER CODE BEGIN USART1_MspInit 0 */
-
-  /* USER CODE END USART1_MspInit 0 */
     /* Peripheral clock enable */
     __HAL_RCC_USART1_CLK_ENABLE();
 
@@ -242,12 +239,28 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
     GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
     GPIO_InitStruct.Pull = GPIO_NOPULL;
     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-  /* USER CODE BEGIN USART1_MspInit 1 */
-
-  /* USER CODE END USART1_MspInit 1 */
   }
+  
+  if(huart->Instance==USART2)
+  {
+    /* Peripheral clock enable */
+    __HAL_RCC_USART2_CLK_ENABLE();
+  
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    /**USART1 GPIO Configuration    
+    PA2     ------> USART2_TX
+    PA3     ------> USART2_RX 
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_2;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
+    GPIO_InitStruct.Pin = GPIO_PIN_3;
+    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+  }
 }
 
 /**

bsp/stm32/stm32f103-blue-pill/board/Kconfig

@@ -37,6 +37,15 @@ menu "On-chip Peripheral Drivers"
                 bool "Enable UART1 RX DMA"
                 depends on BSP_USING_UART1 && RT_SERIAL_USING_DMA
                 default n
+
+            config BSP_USING_UART2
+                bool "Enable UART2"
+                default n
+
+            config BSP_UART2_RX_USING_DMA
+                bool "Enable UART2 RX DMA"
+                depends on BSP_USING_UART2 && RT_SERIAL_USING_DMA
+                default n
         endif
 
     menuconfig BSP_USING_ONCHIP_RTC