STM32F0XX IO中断不响应

只看该作者 · 2016-3-17 17:11

设计IO中断作为按键输入，但是程序不响应中断，哪位大侠帮忙分析一下原因，代码如下：
void test_KEY0_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void test_key_0(void)
{
   GPIO_InitTypeDef GPIO_InitStruct;
   EXTI_InitTypeDef EXTI_InitStruct;
   NVIC_InitTypeDef NVIC_InitStruct;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);


   GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
   GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_2;
   GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
   GPIO_Init(GPIOA, &GPIO_InitStruct);

   SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);


// EXTI_ClearITPendingBit(EXTI_PinSource0);


   EXTI_InitStruct.EXTI_Line = EXTI_PinSource0;
   EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
   EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling;
   EXTI_InitStruct.EXTI_LineCmd = ENABLE;
   EXTI_Init(&EXTI_InitStruct);

   NVIC_InitStruct.NVIC_IRQChannel = EXTI0_1_IRQn;
   NVIC_InitStruct.NVIC_IRQChannelPriority = 0;
   NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStruct);
}

//=============================================================================
//文件名称：EXTI0_1_IRQHandler
//功能概要：按键中断处理函数，
//参数说明：无
//函数返回：无
//=============================================================================
  void EXTI0_1_IRQHandler(void)
  {
   if ( EXTI_GetITStatus(EXTI_Line0)!= RESET )
   {
   LED_TURN;
   EXTI_ClearITPendingBit(EXTI_Line0);
}
   if ( EXTI_GetITStatus(EXTI_Line1)!= RESET )
   {
   LED_TURN;
   EXTI_ClearITPendingBit(EXTI_Line1);
}
  int main(void)
{
// LED_Init();
  test_key_0();
test_KEY0_Init();
while（1）
}

只看该作者 · 2016-3-17 17:14

GPIO pin 0 外部已经加了上拉电阻，但是IO接地，不能中断

1万 · 2016-3-17 20:53

你把端口先配置一下，貌似内部带可配置的上啦电阻吧。