ARM_day7：按键中断

实现三个按键中断，按键按下时，LED灯亮 

mykey.h

#ifndef __MYKEY_H__
#define __MYKEY_H__

#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"

void key1_int_config();
void key2_int_config();
void key3_int_config();

void led_init();
void LED1_CTRL(int flag);
void LED2_CTRL(int flag);
void LED3_CTRL(int flag);

#endif

mykey.c

#include "mykey.h"

void key1_int_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF9为输入
    GPIOF->MODER &= (~(0x3<<18));
    //设置PF9产生EXTI9事件
    EXTI->EXTICR3 &= (~(0xff<<8));
    EXTI->EXTICR3 |= (0x5<<8);
    //设置下降沿检测PF9事件
    EXTI->FTSR1 |= (0x1<<9);
    //取消EXTI9事件的屏蔽
    EXTI->C1IMR1 |= (0x1<<9);
    //全局使能99号中断
    GICD->ISENABLER[3] |= (0x1<<3);
    //设置99号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<27));  //00000
    //设置99号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<24);   //交给处理器0处理
    //允许组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);     //掩码为11111
    //允许组0中断被转发给处理器
    GICC->CTRL |= 0x1;
}
void key2_int_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF8为输入
    GPIOF->MODER &= (~(0x3<<16));
    //设置PF8产生EXTI8事件
    EXTI->EXTICR3 &= (~(0xff));
    EXTI->EXTICR3 |= (0x5);
    //设置下降沿检测PF8事件
    EXTI->FTSR1 |= (0x1<<8);
    //取消EXTI8事件的屏蔽
    EXTI->C1IMR1 |= (0x1<<8);
    //全局使能98号中断
    GICD->ISENABLER[3] |= (0x1<<2);
    //设置98号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f)<<19);  //00000
    //设置98号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<16);   //交给处理器0处理
    //允许组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);     //掩码为11111
    //允许组0中断被转发给处理器
    GICC->CTRL |= 0x1;
}
void key3_int_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF7为输入
    GPIOF->MODER &= (~(0x3<<14));
    //设置PF7产生EXTI7事件
    EXTI->EXTICR2 &= (~(0xff<<24));
    EXTI->EXTICR2 |= (0x5<<24);
    //设置下降沿检测PF7事件
    EXTI->FTSR1 |= (0x1<<7);
    //取消EXTI7事件的屏蔽
    EXTI->C1IMR1 |= (0x1<<7);
    //全局使能97号中断
    GICD->ISENABLER[3] |= (0x1<<1);
    //设置97号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f)<<11);  //00000
    //设置97号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<8);   //交给处理器0处理
    //允许组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);     //掩码为11111
    //允许组0中断被转发给处理器
    GICC->CTRL |= 0x1;
}

main.c

#include "mykey.h"

//手动封装一个延时函数
void delay(int ms)
{
	int i,j;
	for(i=0;i<ms;i++)
	{

		for(j=0;j<2000;j++)
		{

		}
	}

}
int main()
{
	//按键中断初始化
	key1_int_config();
	key2_int_config();
	key3_int_config();
	//led灯初始化
	led_init();
	while(1)
	{

	}
	return 0;
}

do_irq.c

#include "mykey.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:
        // 中断处理逻辑
        LED1_CTRL(1);
        LED2_CTRL(0);
        LED3_CTRL(0);
        // 清除GICD的中断标志
        GICD->ICPENDR[3] |= (0x1 << 3);
        // 清除EXTI中的中断触发标志
        EXTI->FPR1 |= (0x1 << 9);
        break;
    case 98:
        // 中断处理逻辑
        LED1_CTRL(0);
        LED2_CTRL(1);
        LED3_CTRL(0);
        // 清除GICD的中断标志
        GICD->ICPENDR[3] |= (0x1 << 2);
        // 清除EXTI中的中断触发标志
        EXTI->FPR1 |= (0x1 << 8);
        break;
    case 97:
        // 中断处理逻辑
        LED1_CTRL(0);
        LED2_CTRL(0);
        LED3_CTRL(1);
        // 清除GICD的中断标志
        GICD->ICPENDR[3] |= (0x1 << 1);
        // 清除EXTI中的中断触发标志
        EXTI->FPR1 |= (0x1 << 7);
        break;
    default:
        break;
    }
    // 清除IAR寄存器中保存的中断号
    GICC->EOIR = irqno;
}