EXTI0检测中断问题

glenovo 2010-7-2 14:27 楼主

PA0指到EXTI0，下降沿产生中断。现在初始化没问题，就是初始化之后有时会直接进中断一次，在初始化软件产生中断也没问题，但是初始化之后就再也检测不出中断。现在跟肯定不是硬件信号的问题，因为：1.一开始使用TIM2_IT1可以检测中断；2.后来用EXTI0曾经检测出中断，后来发现检测到的信号少于生成信号就又改了改程序，现在即使恢复原程序也还是检不出；3.示波器检测单片机PA0上确实有信号。
所以，紧急求教！！

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沙发 eeworld_tw

相关代码：
1）void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

#ifdef  VECT_TAB_RAM

  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //Set the Vector Table base location at 0x20000000
#else  // VECT_TAB_FLASH

  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);//Set the Vector Table base location at 0x08000000
#endif

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//设置优先级分组:2个抢先级，6个子级

  /* 设置 TIM2 中断 */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* 设置 EXTI0 中断 */
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

2） GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;//TIM2 Channel1, 2, 3 and 4
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
3）void EXTI_Configuration(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;

  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);//将EXTI0连到PA.00

  /* 配置 EXTI Line 0 在下降沿产生中断 */
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

//  EXTI_GenerateSWInterrupt(EXTI_Line0);//通过软件触发一次 EXTI line 0 中断

4）void EXTI0_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line0) != RESET)
  {
/* 调试操作 */

EXTI_ClearFlag(EXTI_Line0);//清除 EXTI0

Alnico = CH1;

TT = No_CH;

No_CH++;

  }
}

点赞 2010-7-2 14:32