应用场景
PC7管脚外部中断触发例程
void ALR_EXTI_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/*GPIO 时钟使能*/
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/*---- GPIO PC7*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* 配置EXTI */
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Line = EXTI_Line7;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC,EXTI_PinSource7);
EXTI_ClearITPendingBit(EXTI_Line7);
NVIC_InitStructure.NVIC_IRQChannel = EXTI7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI7_IRQHandler(void)
{
if (EXTI_GetFlagStatus(EXTI_Line7) != RESET)
{
// LED 翻转
LED2 =! LED2;
tp_** = 1;
//清除中断位
EXTI_ClearITPendingBit(EXTI_Line7);
}
}
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