ARM 中断控制灯

do_irq_c

cs 复制代码

#include"key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
    //先获取中断号
    unsigned int irqno=(GICC->IAR &0x3ff);
    switch(irqno)
    {
        case 99://按键1中断
            //进行中断处理
            printf("do_key1_int\n");
            //清除GICD中的中断排队标志
            GICD->ICPENDR[3] |= (0x1<<3);
            //清除EXTI中的事件挂起标志
            EXTI->FPR1 |= (0x1<<9);
            break;

        case 98://按键2中断
            //进行中断处理
            printf("do_key2_int\n");
            //清除GICD中的中断排队标志
            GICD->ICPENDR[3] |= (0x1<<2);
            //清除EXTI中的事件挂起标志
            EXTI->FPR1 |= (0x1<<8);
            break;

        case 97://按键3中断
            //进行中断处理
            printf("do_key3_int\n");
            //清除GICD中的中断排队标志
            GICD->ICPENDR[3] |= (0x1);
            //清除EXTI中的事件挂起标志
            EXTI->FPR1 |= (0x1<<7);
            break;
    }
    //清除IAR保存的中断号
    GICC->EOIR = irqno;
}

key_it.c

cs 复制代码

#include"key_it.h"
#include"gpio.h"

//按键1中的中断配置
void key1_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF9设置为输入
    GPIOF->MODER &= (~(0X3<<18));
    //设置PF9生成EXTI9事件
    EXTI->EXTICR3 &= (~(0xff<<8));
    EXTI->EXTICR3 |= (0X05<<8);
    //设置下降沿检测EXTI9事件
    EXTI->FTSR1 |= (0X1<<9);
    //取消EXTI9的屏蔽
    EXTI->C1IMR1 |= (0X1<<9);
    //使能99号中断
    GICD->ISENABLER[3] |= (0x1<<3);
    //设置使能99号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0X1f<<27));
    //设置99号中断目标处理器
    GICD->ITARGETSR[24] |= (0X1<<24);
    //全局使能组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断优先级掩码
    GICC->PMR |= (0X1f<<3);
    //全局使能组0中断转发给处理器
    GICC->CTRL |= (0X1);
}
//按键2中的中断配置
void key2_config()
{
     //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF8设置为输入
    GPIOF->MODER &= (~(0X3<<16));
    //设置PF8生成EXTI8事件
    EXTI->EXTICR3 &= (~(0xff));
    EXTI->EXTICR3 |= (0X05);
    //设置下降沿检测EXTI8事件
    EXTI->FTSR1 |= (0X1<<8);
    //取消EXTI8的屏蔽
    EXTI->C1IMR1 |= (0X1<<8);
    //使能98号中断
    GICD->ISENABLER[3] |= (0x1<<2);
    //设置使能98号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0X1f<<19));
    //设置98号中断目标处理器
    GICD->ITARGETSR[24] |= (0X1<<16);
    //全局使能组0中断被转发到GICC层
    GICD->CTRL |= (0X1<<0);
    //设置中断优先级掩码
    GICC->PMR &= (~(0X1f<<3));
    GICC->PMR |= (0X6<<3);
    //全局使能组0中断转发给处理器
    GICC->CTRL |= (0X1);
}
//按键3中的中断配置
void key3_config()
{
     //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF7设置为输入
    GPIOF->MODER &= (~(0X3<<14));
    //设置PF7生成EXTI7事件
    EXTI->EXTICR2 &= (~(0xff<<24));
    EXTI->EXTICR2 |= (0X5<<24);
    //设置下降沿检测EXTI7事件
    EXTI->FTSR1 |= (0X1<<7);
    //取消EXTI7的屏蔽
    EXTI->C1IMR1 |= (0X1<<7);
    //使能97号中断
    GICD->ISENABLER[3] |= (0x1<<1);
    //设置使能97号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0X1f<<11));
    //设置97号中断目标处理器
    GICD->ITARGETSR[24] |= (0X1<<8);
    //全局使能组0中断被转发到GICC层
    GICD->CTRL |= (0X1<<0);
    //设置中断优先级掩码
    GICC->PMR &= (~(0x1f<<3));
    GICC->PMR |= (0X5<<3);
    //全局使能组0中断转发给处理器
    GICC->CTRL |= (0X1<<0);
}

key_it.h

cs 复制代码

#ifndef _KEY_IT_H_
#define _KEY_IT_H_

#include "gpio.h"

#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"


void key1_config();
void key2_config();
void key3_config();
#endif

main.c

cs 复制代码

#include"key_it.h"
extern void printf(const char *fmt,...);
//手动封装一个延时函数
void delay_ms(int ms)
{
    int i,j;
    for(i=0;i<ms;i++)
    {
        for(j=0;j<2000;j++)
        {

        }
    }
}

void LED_init()
{
	RCC_AHB4_ENSETR |= (0x3<<4);
	gpio_init_t init= {OUTPUT,PP,LOW,NO_PUPD};
	//LED初始化
	hal_gpio_init(GPIOE,&init,GPIO_PIN_10); //led1
	hal_gpio_init(GPIOF,&init,GPIO_PIN_10);//led2
	hal_gpio_init(GPIOE,&init,GPIO_PIN_8);//led3
}


int main()
{
	LED_init();
    key1_config();
	key2_config();
	key3_config();
    while(1)
    {
        printf("do_main\n");
        delay_ms(1000);
    }

    return 0 ;

}