香水版主，请教个外部中断问题。在线等回复（急切）

只看该作者 · 2010-9-11 11:13

我现在用的外部中断引脚是PB5，中断向量是EXTI9_5_IRQChannel，但是进入中断1次后就死机了。然后就是can't halt the core。 AFIO也打开了，郁闷了好几天了。
以下是我的配置程序：
时钟：
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB| RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOC|RCC_APB2Periph_USART1, ENABLE);

I/O:
//PB5作为PDI外部中断，IO设为输悬浮输入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

EXTI初始化：
void ExtiInit(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
/* Connect Key Button EXTI Line to Key Button GPIO Pin */
EXTI_InitStructure.EXTI_Line = EXTI_Line5;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource5);
}

配置NVIC:
void DrvierNVICConfig(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
/* enable DMA1_Channel1 interrupt from nivc */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the EXTI5_IRQChannel Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;    //PDI掉电中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

中断服务程序：
void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line5) != RESET)
{
   if(PDI_FLAG==0)
{
LcdCommand(0xAE); //关显示
PDI_FLAG=1;
}
  else
{
LcdCommand(0xAF); //开显示
PDI_FLAG=0;
}
//  /* Clear the Key Button EXTI line pending bit */
   EXTI_ClearITPendingBit(EXTI_Line5);
}
}