主程序
#include "sys.h" #include "EXTI.h" #include "led.h" int main(void) { //1.配置优先级分组 NVIC_Configuration(); Led_Init(); EXTI_KEY_Init(); while(1) { } } void EXTI15_10_IRQHandler(void) { if(EXTI_GetFlagStatus(EXTI_Line10) == 1) { LED = 0; EXTI_ClearFlag(EXTI_Line10); } if(EXTI_GetFlagStatus(EXTI_Line11) == 1) { LED = 1; EXTI_ClearFlag(EXTI_Line11); } }
LED灯初始化
#include "sys.h" #include "EXTI.h" #include "led.h" int main(void) { //1.配置优先级分组 NVIC_Configuration(); Led_Init(); EXTI_KEY_Init(); while(1) { } } void EXTI15_10_IRQHandler(void) { if(EXTI_GetFlagStatus(EXTI_Line10) == 1) { LED = 0; EXTI_ClearFlag(EXTI_Line10); } if(EXTI_GetFlagStatus(EXTI_Line11) == 1) { LED = 1; EXTI_ClearFlag(EXTI_Line11); } }
中断初始化
#include "EXTI.h" 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; //2.配置管脚时钟和复用时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO,ENABLE); //3.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); //4.配置GPIO口为外部中断模式 GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource11); GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource10); //5.配置EXTI中断触发模式 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); 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); //6.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); }