按键控制LED灯亮和灭

do_irq.c

#include "key_it.h"
//#include "led.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{//获取中断号unsigned int irqno=(GICC->IAR & (0x3FF));switch (irqno){case 99://处理中断GPIOE->ODR ^= (0x1<<8);//清除中断队列GICD->ICPENDR[3] |= (0x1<<3);//清除中断挂起标志EXTI->FPR1 |= (0x1<<9);break;case 98://处理中断GPIOE->ODR ^= (0x1<<10);//清除中断队列GICD->ICPENDR[3] |= (0x1<<2);//清除中断挂起标志EXTI->FPR1 |= (0x1<<8);break;case 97://处理中断GPIOF->ODR ^= (0x1<<10);//清除中断队列GICD->ICPENDR[3] |= (0x1<<1);//清除中断挂起标志EXTI->FPR1 |= (0x1<<7);break;default:break;}//清除中断号GICC->EOIR = irqno;
}

key_it.c

#include "key_it.h"//按键1初始化
void key1_init(){//使能GPIOF的RCC时钟RCC->MC_AHB4ENSETR |= (0x1<<5);//配置PF9为输入模式GPIOF->MODER &= (~(0x3<<18));//配置中断选择器EXTI9为PFEXTI->EXTICR3 &= (~(0xFF<<8));EXTI->EXTICR3 |= (0x05<<8);//配置为下降沿触发EXTI->FTSR1 |= (0x1<<9);//使能中断，关闭中断屏蔽EXTI->C1IMR1 |= (0x1<<9);//设置中断使能GICD->ISENABLER[3] |= (0x1<<3);//设置中断优先级GICD->IPRIORITYR[24] &= (~(0x1F<<27));//设置中断处理cpuGICD->ITARGETSR[24] |= (0x1<<24);//使能中断,中断默认在组0GICD->CTRL |=(0x1);//设置使能GICC->CTRL |= (0x1);//设置优先级掩码GICC->PMR |= (0x1f<<3);}//按键2初始化
void key2_init(){//配置PF7为输入模式GPIOF->MODER &= (~(0x3<<14));//配置中断选择器EXTI7为PFEXTI->EXTICR2 &= (~(0xFF<<24));EXTI->EXTICR2 |= (0x05<<24);//配置为下降沿触发EXTI->FTSR1 |= (0x1<<7);//使能中断，关闭中断屏蔽EXTI->C1IMR1 |= (0x1<<7);//设置中断使能GICD->ISENABLER[3] |= (0x1<<1);//设置中断优先级GICD->IPRIORITYR[24] &= (~(0x1F<<11));//设置中断处理cpuGICD->ITARGETSR[24] |= (0x1<<8);//使能中断,中断默认在组0GICD->CTRL |=(0x1);//设置使能GICC->CTRL |= (0x1);//设置优先级掩码GICC->PMR |= (0x1f<<3);
}//按键3初始化
void key3_init(){//配置PF8为输入模式GPIOF->MODER &= (~(0x3<<16));//配置中断选择器EXTI8为PFEXTI->EXTICR3 &= (~0xFF);EXTI->EXTICR3 |= 0x05;//配置为下降沿触发EXTI->FTSR1 |= (0x1<<8);//使能中断，关闭中断屏蔽EXTI->C1IMR1 |= (0x1<<8);//设置中断使能GICD->ISENABLER[3] |= (0x1<<2);//设置中断优先级GICD->IPRIORITYR[24] &= (~(0x1F<<19));//设置中断处理cpuGICD->ITARGETSR[24] |= (0x1<<16);//使能中断,中断默认在组0GICD->CTRL |=(0x1);//设置使能GICC->CTRL |= (0x1);//设置优先级掩码GICC->PMR |= (0x1f<<3);
}

led.h

#ifndef __LED_H__
#define __LED_H__/*//gpio寄存器
typedef struct{volatile unsigned int MODER;volatile unsigned int OTYPER;volatile unsigned int OSPEEDR;volatile unsigned int PUPDR;volatile unsigned int IDR;volatile unsigned int ODR;volatile unsigned int BSRR;
}gpio_t;*///GPIOE和GPIOF寄存器宏定义
//#define GPIOE (*(gpio_t *)0x50006000)
//#define GPIOF (*(gpio_t *)0x50007000)//led灯1初始化
void led1_init();
//led灯2初始化
void led2_init();
//led灯3初始化
void led3_init();//led灯1控制
void led1_ctl(int flag);
//led灯2控制
void led2_ctl(int flag);
//led灯3控制
void led3_ctl(int flag);#endif

main.c

#include "gpio.h"
#include "led.h"
#include "uart4.h"
#include "key_it.h"void delay(){for(int i=0;i<500;i++){for(int j=0;j<2000;j++){}}
}
extern void printf(const char *fmt, ...);
int main()
{//使能PE、PF时钟*((unsigned int *)0x50000A28) |= (0x3<<4);	led1_init();led2_init();led3_init();key1_init();key2_init();key3_init();while (1){printf("do_main\n");delay(1000);}return 0;
}