关于两个STM32F103主控板实现串口通信的接收中断函数问题

陈皮皮 · 发表于 2017-4-8 18:31:03

两块STM32F103主控板，用各自的USART1 通信收发数据，（都是通过外部中断触发）一块能收能发，一块只能发送数据不能接收数据，硬件经过排查没有问题，想问问前辈们我的代码是否有误。（其他配置经过验证是没问题的，现在排查之后觉得最有可能的就是接收函数问题）以下是串口配置和中断服务函数代码：
我发送的数组为  u8 Work_CH2[10] ={0x31,0x31,0x0d,0x0a};

外部中断服务函数为：
void EXTI4_IRQHandler(void)                                        {
  int i ;
  if(EXTI_GetITStatus(EXTI_Line4)!=RESET)
{
   EXTI_ClearITPendingBit(EXTI_Line4);
      TIM_SetCompare1(TIM3,6000);
   for(i=0;i<4;i++)
   {
   USART_SendData(USART1, Work_CH2);
   while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
   }
      }
}

void usart1_init(u32 bound)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
  USART_DeInit(USART1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_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;

USART_Init(USART1, &USART_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);

}

void USART1_IRQHandler(void)
   {
      u8 Res;
         if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
   Res =USART_ReceiveData(USART1);
              if((USART_RX_STA&0x8000)==0)
   {
      if(USART_RX_STA&0x4000)
      {
      if(Res!=0x0a)USART_RX_STA=0;
   else
      {
USART_RX_STA|=0x8000;
               }
      }
      else
         {
            if(Res==0x0d)  USART_RX_STA|=0x4000;
   else
   {
      USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
      USART_RX_STA++;
      if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;
   }
   }
      }
   }
}