STM32用中断控制LED小灯的亮灭

STM32f103最小系统板 

PC13 接一个LED小灯

首先配置LED灯

void LED_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);

//初始化PC13为推挽式输出

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOC, &GPIO_InitStructure);

}

然后配置按键键盘为上拉式输入和配置EXTI函数

void EXTI_KEY_Init(void)//配置PB11为下降沿触发

{

GPIO_InitTypeDef GPIO_InitStructure;

EXTI_InitTypeDef EXTI_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

//配置管脚时钟和复用时钟

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);

//配置GPIO为上拉输入

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_10;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

GPIO_Init(GPIOB, &GPIO_InitStructure);

//配置GPIO口为外部中断模式

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource11);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource10);

//配置EXTI_LINE10中断触发模式

EXTI_InitStructure.EXTI_Line = EXTI_Line10;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

EXTI_InitStructure.EXTI_Line = EXTI_Line11;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

//配置EXTI的中断优先级

NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void EXTI15_10_IRQHandler(void)

{

if(EXTI_GetFlagStatus(EXTI_Line10) == 1)     //判断哪个按键输入

{

LED = 0;

EXTI_ClearFlag(EXTI_Line10);

}

if(EXTI_GetFlagStatus(EXTI_Line11) == 1)     //判断哪个按键输入

{

LED = 1;

EXTI_ClearFlag(EXTI_Line11);

}

}

在主函数里初始化LED EXTI函数

int main(void)

{

NVIC_Configuration();

LED_Init();

EXTI_KEY_Init();

delay_init();

while(1)

{

}

}