为什么无法实现抢占功能？

只看该作者 · 2013-12-30 11:17

用的是Stm32f103vb开发板；

KEY1(PB10)和KEY2(PB11)分别触发两个中断，其中KEY1中断的优先级高于KEY2的优先级，
想通过实验验证当中断2程序运行时（LED3、4点亮）可以被中断1的程序抢断（LED1、2点亮）；

可是接通实验板运行后按KEY2后LED3、4灯点亮，再按KEY1后无法实现抢断的功能；是我的优先级配置
出错了还是中断程序不对呢，请指教；以下是中断的程序；

void EXTI10_Config(void)
{
      EXTI_InitTypeDef  EXTI_InitStructure;
      NVIC_InitTypeDef  NVIC_InitStructure;

      GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource10);
      EXTI_InitStructure.EXTI_Line=EXTI_Line10;
      EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
      EXTI_InitStructure.EXTI_LineCmd=ENABLE;
      EXTI_Init(&EXTI_InitStructure);

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
      NVIC_InitStructure.NVIC_IRQChannel=EXTI15_10_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
      NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}

void EXTI11_Config(void)
{
      EXTI_InitTypeDef  EXTI_InitStructure;
      NVIC_InitTypeDef  NVIC_InitStructure;

      GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource11);
      EXTI_InitStructure.EXTI_Line=EXTI_Line11;
      EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
      EXTI_InitStructure.EXTI_LineCmd=ENABLE;
      EXTI_Init(&EXTI_InitStructure);

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
      NVIC_InitStructure.NVIC_IRQChannel=EXTI15_10_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
      NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}
void EXTI15_10_IRQHandler(void)
{

if (EXTI_GetITStatus(EXTI_Line10)!=RESET)
      {
      while(1)
      {
         LED1_ON;
         LED2_ON;
         LED3_OFF;
         LED4_OFF;
      EXTI_ClearITPendingBit(EXTI_Line10);
      }
      }

      if (EXTI_GetITStatus(EXTI_Line11)!=RESET)
      {
         while(1)
      {
         LED1_OFF;
         LED2_OFF;
         LED3_ON;
         LED4_ON;
      EXTI_ClearITPendingBit(EXTI_Line11);
      }
      }
}