STM32 不断进入串口中断问题 解决方法

STM32 有时候会不断进入中断，解决方法如下

1.串口初始化配置时，需要打开ORE 溢出中断，如下红色代码所示

void Usart_Init(void){GPIO_InitTypeDef GPIO_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;USART_InitTypeDef USART_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);// 开启串口时钟GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1);    GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode= GPIO_Mode_AF;GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;GPIO_Init(GPIOA,&GPIO_InitStructure);USART_InitStructure.USART_BaudRate = 57600;// 配置波特率为115200USART_InitStructure.USART_StopBits = USART_WordLength_8b;// 配置数据长度为8USART_InitStructure.USART_StopBits = USART_StopBits_1;//设置停止位USART_InitStructure.USART_Parity = USART_Parity_No;// 配置奇偶校验为NONEUSART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;// 配置硬件流为NONE  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;// 打开Rx接收和Tx发送功能USART_Init(USART1,&USART_InitStructure);// 配置USART_Cmd(USART1,ENABLE);NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;// 选择中断通道NVIC_InitStructure.NVIC_IRQChannelPriority = 2;// 抢断优先1NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;// 使能中断NVIC_Init(&NVIC_InitStructure);<span style="color:#ff0000;">USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);// 打开中断USART_ITConfig(USART1, USART_IT_ORE, ENABLE);</span>// 打开中断}

2.在中断中，检测溢出中断并作处理，代码如下所示

void USART1_IRQHandler(void){u8 dat;<span style="color:#ff0000;">if (USART_GetITStatus(USART1, USART_IT_ORE) == SET){USART_ClearITPendingBit(USART1,USART_IT_ORE);    USART_ReceiveData( USART1 );}</span>if( USART_GetITStatus(USART1,USART_IT_RXNE) != RESET )// 等价于if( !RI ) 检查串口数据是否已就位{USART_ClearITPendingBit(USART1,USART_IT_RXNE);dat = USART_ReceiveData( USART1 );uart_rec_buf[uart_len++]=dat;RX_TIM=UART_INIT_TIM;}}

这样就可以解决，串口不断进入中断的问题