STM32 HAL 串口收发（无DMA，中断接收）

STM32CUBE配置

一、使用printf发送数据，在usart.c中添加代码串口重定向

/* USER CODE BEGIN 0 */
#include <stdio.h> 
 
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE
{
	HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);//注意把&huart1改为自己的stm32使用的串口号
 
	return ch;
}
 
 
/* USER CODE END 0 */

while (1)
  {
    /* USER CODE END WHILE */
          ch=2345.1234;
		  printf("%.2f
",ch);
			HAL_Delay(1000);
    /* USER CODE BEGIN 3 */
  }

二、中断接收数据

在main函数中添加串口中断函数

/* USER CODE BEGIN 2 */
  HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1);//开串口中断
  /* USER CODE END 2 */

定义变量接收数据

/* USER CODE BEGIN Includes */

#define RXBUFFERSIZE  256     //最大接收字节数
char RxBuffer[RXBUFFERSIZE];   //接收数据
uint8_t aRxBuffer;			    //接收中断缓冲
uint8_t Uart1_Rx_Cnt = 0;		//接收缓冲计数
/* USER CODE END Includes */

在用户代码中添加中断接收解析代码

/* USER CODE BEGIN 0 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    UNUSED(huart);
	if(Uart1_Rx_Cnt >= 255)  //溢出判断
	{
		Uart1_Rx_Cnt = 0;
		memset(RxBuffer,0x00,sizeof(RxBuffer));
		HAL_UART_Transmit(&huart1, (uint8_t *)"数据溢出", 10,0xFFFF); 	        
	}
	else
	{
		RxBuffer[Uart1_Rx_Cnt++] = aRxBuffer;   //接收数据转存	
		if((RxBuffer[Uart1_Rx_Cnt-1]==0x0A)&&(RxBuffer[Uart1_Rx_Cnt-2]==0x0D))//判断结束位
		{
			if(RxBuffer[0] == A)//串口数据开头，检测是否是需要的数据，开头为A则让灯取反
			{
				HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_15);             //取反
			}
			Uart1_Rx_Cnt = 0;
			memset(RxBuffer,0x00,sizeof(RxBuffer)); //清空数组
		}
	}	
	HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1);   //再开启接收中断
}
/* USER CODE END 0 */