【串口USART3中断】串口可中断发送无**常接收

只看该作者 · 2016-4-19 08:23

配置如下：
1、USART3寄存器配置
USART_DeInit(USART3);
USART_StructInit(&USART_InitStructure);
USART_Init(USART3,&USART_InitStructure);
USART3->CR1|=0x206c; //;USART模块使能，允许接收发送，使能USART中断
USART3->BRR=0x1A0A; //BaudRate 4800

2、引脚配置
//USART3 配置//
// Configure USART3 Tx (PB.10) as alternate function push-pull //
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
//对于发送PIN必须配置成复用输出上拉否则不能正常发送//
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Configure USART3 Rx (PB.11) as input floating //
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
//对于接收PIN必须配置成浮点输入否则不能正常接收//
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

3、时钟配置
这里我用到很多其它的外设，也注意了管脚默认功能问题IIC这里是没用开启时钟的
#define  GPIO_Remap_JTAG_Disable 0x04000000
//Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG and AFIO clocks
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1|
   RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|
        RCC_APB2Periph_GPIOD| RCC_APB2Periph_AFIO,ENABLE);
//启动IO口的复用功能(AFIO), 用于外部中断
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//使能I2C2, SPI2 时钟//
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3|RCC_APB1Periph_TIM2|
RCC_APB1Periph_TIM3|RCC_APB1Periph_TIM4|RCC_APB1Periph_DAC, ENABLE );

4、中断函数如下
可忽略各标志位，现在是发送数据正常（向USART3->DR写数据触发发送中断）。使用上位机串口猎人发送数据，USART3->DR没用接收到数据，无法触发接收终断
void USART3_IRQHandler(void)
{
BYTE  RecTemp;

if(USART3->SR&0x40) //发送
   {
     USART3->SR&=~0x40;
     if(SCIStartSent)
   {
   if(SendCounter<SendBuffer[0])
      USART3->DR= SendBuffer[SendCounter++];
   else
   {
               if(!SCIRece)sentIntervalDelay = 3; // 3ms 完成一循通信稍做延时以便SCI有空闲做下次通信,此种情况专属sentkey
        SCISentDis;
        SendCounter=0;
        SCIStartSent=0;
                }
     }
   }

   if(USART3->SR&0x20) //接收 //ReceBuffer[]不包含0x01
     {
      RecTemp=USART3->DR;

      if(AddrEqual==0)
      {
   if(RecTemp==Saddress)
      {
           AddrEqual=1;  //被正确询址
           ReceBuffer[1]=Saddress;
           }
      }
         else
         {
      if(RendCounter<LENGTH)
                 ReceBuffer[2+RendCounter++]=RecTemp;

         if(RendCounter==LENGTH)
              {
                 RendCounter=0;
            if(SCIRece)
               {
                  SCIRece=0;
                  sentIntervalDelay=3; // 3ms 完成一循通信稍做延时以便SCI有空闲做下次通信
               }
         FinishedRece=1;  //完成一帧数据接收
         AddrEqual=0;
SCIstate.bit.SCISendtoComputer = 1; // CP返回数据接收完成，可在1ms中断中进行数据处理
           }
     }
     }
}

5、有没有遇到过类似问题的网友了，谢谢大家讨论帮助！

只看该作者 · 2016-4-19 08:27

6、补充我的中断使能设置如下：

void NVIC_Configuration(void)
{
   NVIC_InitTypeDef NVIC_InitStructure;

/* Configure the NVIC Preemption Priority Bits */
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_Init(&NVIC_InitStructure);
}

只看该作者 · 2016-4-21 16:33

这是我的USART1配置：收发都可以用的，你修改一下应该可以。
//初始化 USART1 的时钟
static void  USART1_RCC_Configuration(void)
{
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
}

//配置 USART1 的工作模式
static void  USART1_GPIO_Configuration(void)
{
      /*定义 GPIO 初始化结构体*/
      GPIO_InitTypeDef GPIO_InitStructure;
      /*初始化结构体*/
      GPIO_StructInit(&GPIO_InitStructure);

      /*配置 USART1 的发送端口*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;                //PD.8
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;       //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure);                      //初始化PD8

      /*配置 USART1 的接收端口*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);                //初始化PD9
}

//配置 USART1 的工作参数
static void  USART1_Configuration(u32 bound)
{
      USART_InitTypeDef USART_InitStructure;

      USART_InitStructure.USART_BaudRate = bound;
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      USART_InitStructure.USART_Parity = USART_Parity_No;
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
      /*配置 USART1 的异步双工串行工作模式*/
      USART_Init(USART1, &USART_InitStructure);
      /*使能 USART1 的接收中断  */
      USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
      /*使能 USART1 的发送中断*/
      USART_ITConfig(USART1, USART_IT_TC, ENABLE);
      /*使能 USART1*/
      USART_Cmd(USART1, ENABLE);
}

//配置中断优先级函数
static void  USART1_NVIC_Configuration(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;
      /* Enable the USARTx Interrupt */
      NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}

void USART1_Init(u32 bound)
{
      USART1_RCC_Configuration();
      USART1_GPIO_Configuration();
      USART1_NVIC_Configuration();
      USART1_Configuration(bound);
}

/*-----------------------------------------------------------------------------
  Function:             USART1_IRQHandler

  Parameter:
                     None
  Returns:
                     None
  Description:
                     USART1 ISR routine.
*-----------------------------------------------------------------------------*/
void USART1_IRQHandler(void){
      u8 Res;
      if (USART_GetITStatus(USART1, USART_IT_TC) != RESET)                //发送中断
      {
            USART_SendData(USART1, Res);
            USART_ClearFlag(USART1, USART_FLAG_TC);
      }
      }else if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断
      {
            USART_ClearFlag(USART1,USART_FLAG_RXNE);          //清空中断标记
            Res = USART1->DR;
      }
}