请教一下关于串口中断和外中断合用的问题

jack20221 · 发表于 2011-7-13 10:17:13

STM32F103,4路串口中断接受没有问题，单测外部中断也没有问题，放在一起的时候，出问题了，外中断能影响串口中断（选用的是下降沿中断，单侧是没有问题的，和串口中断在一起的时候，发现串口丢数据了，而且在按键没有抬起时，串口不能接受了，在主循环里一个流水等也不流了）反复改NVIC里的中断优先级了，4路串口在115200 100MS定时发送500字节左右，都能正确响应（中断函数里就是收到什么在回发出来），同时定时器里控制灯闪和主程序里流水也没问题。好几天了，哪位给指教一下，对NVIC里的优先级什么的搞的云里雾里的，呵呵要求外中断级别是最低的，不能影响串口
俺在线等结果呢，在好几个群里发了问，都无人回应!!

void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure;

/*********************外部中断0配置*************************/
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource1); //把PA.0设置为外部中断0

EXTI_DeInit();     //将EXIT寄存器重设置为缺省值
   EXTI_InitStructure.EXTI_Line = EXTI_Line1; //设置外部中断线0
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//EXTI_Mode_Interrupt; EXTI_Mode_Event //设置EXTI线路为重点请求
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //设置输入线路为下降沿为中断请求
EXTI_InitStructure.EXTI_LineCmd = ENABLE;   //中断使能
EXTI_Init(&EXTI_InitStructure);
//EXTI_GenerateSWInterrupt(EXTI_Line1);

}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); // 设置先占优先级2位，从优先级2位；

// Enable the TIM2 global Interrupt
/*
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel; // TIM2 全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; // 先占优先级 0 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // 从优先级 0 ；
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // IRQ通道被使能 ;
NVIC_Init(&NVIC_InitStructure);
    */
  // Enable the TIM3 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel; // TIM3 全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; // 先占优先级 1 ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; // 先占优先级 0 ;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // IRQ通道被使能 ;
NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel; // USART1 全局中断 ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/*
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel; // USART2 全局中断 ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
*/
   /*
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQChannel; // USART3 全局中断 ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
*/
/*
NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQChannel; // USART4 全局中断 ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;
//NVIC_InitStructure.NVIC_IRQChannelSubPriority = 5;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
*/
  /* */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQChannel;//EXTI0_IRQChannel;//设置外部中断0
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;//主优先级为4
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//从优先级为4
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//中断使能
NVIC_Init(&NVIC_InitStructure);

}

void USART2_IRQHandler(void)
{
u8 mm,i,p,n;
if(USART_GetITStatus(USART2, USART_FLAG_ORE) != RESET)
  {
    mm=(u8)(USART_ReceiveData(USART2));
    USART_SendData(USART2,mm);
  }
}

void UART4_IRQHandler(void)
{
u8 mm,i,p,n;
//USART_SendData(USART1,'<');
if(USART_GetITStatus(UART4, USART_FLAG_RXNE) != RESET)
  {
    mm=(u8)(USART_ReceiveData(UART4));
    USART_SendData(UART4,mm);
  }
//USART_SendData(USART1,'>');
}

最开始调试的时候在中断里一直判断这个USART_FLAG_RXNE，后来在把4个串口都打开的时候在判断这个不行了，程序一直在这个中断里不出来，所以就判断USART_FLAG_ORE这个，目前串口还没问题，这个我稍后在查