使用STM32的PC0无法响应EXTI，请问该如何查找原因？

只看该作者 · 2012-4-15 20:29

部分代码：

初始化GPIO：

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN ;

GPIO_Init(GPIOC, &GPIO_InitStructure);
初始化nvic：

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);
初始化exti:

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource0);

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

EXTI_InitStructure.EXTI_Line = EXTI_Line0;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

EXTI_ClearITPendingBit(EXTI_Line0);
中断响应：
void EXTI0_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line0) != RESET)
{
      TestIntProcess();  //  <<===== 不管按钮怎么按，代码一直执行不到此处。
      EXTI_ClearITPendingBit(EXTI_Line0);
}
}