请教串口中断接收误码

发布于 2020-06-29 18:52:34 浏览：1666 订阅该版

串口以中断方式接收数据，当波特率为115200时经常会出现字符串缺少个别字符，使用9600时则不会。目前只能确定是串口接收时出的问题，不能确定具体是什么原因

以下是串口程序
```c
int Uart_Init(void)
{
    //UART2 初始化设置
    UART2_Handler.Instance = USART2;					  	//USART2
    UART2_Handler.Init.BaudRate = 115200;					//波特率
    UART2_Handler.Init.WordLength = UART_WORDLENGTH_8B; 	//字长为8位数据格式
    UART2_Handler.Init.StopBits = UART_STOPBITS_1;	  		//一个停止位
    UART2_Handler.Init.Parity = UART_PARITY_NONE;		  	//无奇偶校验位
    UART2_Handler.Init.HwFlowCtl = UART_HWCONTROL_NONE; 	//无硬件流控
    UART2_Handler.Init.Mode = UART_MODE_TX_RX;		  		//收发模式
    HAL_UART_Init(&UART2_Handler);					    	//HAL_UART_Init()会使能UART2

HAL_UART_Receive_IT(&UART2_Handler, (uint8 *)RxBuf, 1);
	
	return 0;
}
INIT_BOARD_EXPORT(Uart_Init);

/**
 * @brief	HAL库串口底层初始化，时钟使能，引脚配置，中断配置
 *
 * @param	huart	串口句柄
 *
 * @return  void
 */
void HAL_UART_MspInit(UART_HandleTypeDef *huart)
{
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_Initure;

if(huart->Instance == USART2) 
    {
		__HAL_RCC_GPIOA_CLK_ENABLE();				//使能GPIOA时钟
		__HAL_RCC_USART2_CLK_ENABLE();				//使能USART2时钟

GPIO_Initure.Pin = GPIO_PIN_2|GPIO_PIN_3;	//PA2 PA3
		GPIO_Initure.Mode = GPIO_MODE_AF_PP;		//复用推挽输出
		GPIO_Initure.Pull = GPIO_PULLUP;			//上拉
		GPIO_Initure.Speed = GPIO_SPEED_FAST;		//高速
		GPIO_Initure.Alternate = GPIO_AF7_USART2;	//复用为USART2
		HAL_GPIO_Init(GPIOA, &GPIO_Initure);	   	//初始化PA2 PA3
		
		HAL_NVIC_EnableIRQ(USART2_IRQn);            //使能USART2中断通道
        HAL_NVIC_SetPriority(USART2_IRQn, 3, 3);    //抢占优先级3，子优先级3
	}
}

//USART2 Callback
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if(huart->Instance == USART2)
    {
		if(USART2_RX_Count < (USART2_RECV_SIZE-1))
		{
			USART2_Recv_Buf[USART2_RX_Count++] = RxBuf[0];
			USART2_RX_Start = 1;
			USART2_RX_Times = 0;
		}
		else USART2_RX_Count=0;
    }
}
//USART2 IRQ
void USART2_IRQHandler(void)
{
    uint32 timeout;

HAL_UART_IRQHandler(&UART2_Handler);

timeout=0;
    while(HAL_UART_GetState(&UART2_Handler) != HAL_UART_STATE_READY)
    {
        timeout++;
        if(timeout >= HAL_MAX_DELAY)break;
    }

timeout=0;
    while(HAL_UART_Receive_IT(&UART2_Handler, (uint8 *)RxBuf, 1) != HAL_OK)
    {
        timeout++;
        if(timeout >= HAL_MAX_DELAY)break;
    }
}
```