探索者F407板子串口3发送正常，进不了接收中断

xdhujj · 发表于 2021-6-2 16:33:19

探索者F407板子串口3发送正常，进不了接收中断！代码如下：
//---------------------------初始化IO 串口3---------------------------------
//bound:波特率
//-------------------------------------------------------------------------
void uart3_init(u32 bound)
{
      //GPIO端口设置
      GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

//使能GPIOB时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);

   //使能USART3时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

//串口3对应引脚复用映射
GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_USART3);    //GPIOB10复用为USART3
GPIO_PinAFConfig(GPIOB,GPIO_PinSource11,GPIO_AF_USART3);    //GPIOB11复用为USART3

//USART3端口配置
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;    //GPIOB10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;                //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;             //速度50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;             //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;                //上拉
GPIO_Init(GPIOB,&GPIO_InitStructure);                      //初始化PB10

   //USART3初始化设置
USART_InitStructure.USART_BaudRate = bound;                //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;       //一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;          //无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
      USART_Init(USART3, &USART_InitStructure);                   //初始化串口3

//使能串口3
      USART_Cmd(USART3, ENABLE);

      //开启相关中断
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

//USART3 NVIC 配置
   NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;          //串口3中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;    //抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;       //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;       //IRQ通道使能
NVIC_Init(&NVIC_InitStructure);                               //根据指定的参数初始化VIC寄存器
}

//---------------------------串口3中断服务程序------------------------------
//
//-------------------------------------------------------------------------
void USART3_IRQHandler(void)
{
u8 Res;

if(USART_GetITStatus(USART3, USART_IT_RXNE))          //接收中断
{
Res =USART_ReceiveData(USART3);                   //读取接收到的数据
USART_SendData(USART3,Res);                   //把接收到的数据再发送出去
}
}