用STM32的四个外部中断实现四个按键的独立检测 优先级, 检测, 程序

yuyang911220

这些天一直在写外部中断的函数，利用四个按键来控制TFT显示的内容，可是现在按键只能进入一个中断，可是程序会死在中断里出不来，不知道是什么问题，请教一下各位高手看是不是设置的问题
以下程序是中断优先级的设置，
  /* Configure one bit for preemption priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

  /* Enable the EXTI0 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the EXTI1 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0 ;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the EXTI2Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the EXTI3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

以下是外部中断设置：
   GPIO_InitTypeDef GPIO_InitStructure;
   EXTI_InitTypeDef EXTI_InitStructure;

   /*使能时钟（非常关键）*/
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO,ENABLE);

   /* 设置中断优先级 */
   NVIC_Configuration();

   /* EXTI line gpio 设置(PC0、PC1、PC2、PC3) */

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; // 设置为上拉输入
   GPIO_Init(GPIOC, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_Pin =GPIO_Pin_2;
   GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // 设置为推挽输出
   GPIO_Init(GPIOF, &GPIO_InitStructure);

   /* EXTI line mode config */
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource0);
   EXTI_InitStructure.EXTI_Line = EXTI_Line0;
   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //下降沿中断
   EXTI_InitStructure.EXTI_LineCmd = ENABLE;
   EXTI_Init(&EXTI_InitStructure);

   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource1);
   EXTI_InitStructure.EXTI_Line = EXTI_Line1;
   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //下降沿中断
   EXTI_InitStructure.EXTI_LineCmd = ENABLE;
   EXTI_Init(&EXTI_InitStructure);

   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource2);
   EXTI_InitStructure.EXTI_Line = EXTI_Line2;
   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //下降沿中断
   EXTI_InitStructure.EXTI_LineCmd = ENABLE;
   EXTI_Init(&EXTI_InitStructure);

   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource3);
   EXTI_InitStructure.EXTI_Line = EXTI_Line3;
   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //下降沿中断
   EXTI_InitStructure.EXTI_LineCmd = ENABLE;
   EXTI_Init(&EXTI_InitStructure);
以下是中断服务函数，只发了一个中断服务函数，其他的都差不多
void EXTI0_IRQHandler(void)
{        
   if(EXTI_GetITStatus(EXTI_Line0) != RESET)//检测中断是否挂起
   {

//          if(EXTI_GetITStatus(EXTI_Line1) != RESET)
         lcd_display(100, 100, "2012年6月20日");
          delay_us(2000);
          EXTI_ClearITPendingBit(EXTI_Line0);取消中断挂起
   }
}