5.28 ARM cortex-A7核按键中断实验作业

key.h

#ifndef __KEY_H__
#define __KEY_H__

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

void hal_exti_pf9_init();
void hal_gicd_pf9_init();
void hal_gicc_pf9_init();
void hal_exti_pf7_init();
void hal_gicd_pf7_init();
void hal_gicc_pf7_init();
void hal_exti_pf8_init();
void hal_gicd_pf8_init();
void hal_gicc_pf8_init();


#endif

key.c

#include "key.h"

void hal_exti_pf9_init()
{
	//RCC章节初始化
	RCC->MP_AHB4ENSETR|=(0x1<<5);

	//GPIO章节初始化
	GPIOF->MODER &=(~(0x3<<18));

	//exti章节初始化
	EXTI->EXTICR3 &=(~(0xff<<8));
	EXTI->EXTICR3 |=(0x05<<8);

	//设置为下降沿模式
	EXTI->FTSR1 &=(~(0x1<<9));
	EXTI->FTSR1 |=(0x1<<9);

	//设置为中断不屏蔽
	EXTI->C1IMR1 &=(~(0x1<<9));
	EXTI->C1IMR1 |=(0x1<<9);

}

void hal_gicd_pf9_init()
{
	//使能对应组中断
	GICD->CTRL &=(~(0x1<<0));
	GICD->CTRL |=(0x1<<0);

	//设置GICD层中断使能寄存器
	GICD->ISENABLER[3] &=(~(0x1<<3));
	GICD->ISENABLER[3] |=(0x1<<3);

	//设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[24] &=(~(0x1f<<27));
	GICD->IPRIORITYR[24] |=(0x1<<27);

	//设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[24] &=(~(0x3<<24));
	GICD->ITARGETSR[24] |=(0x1<<24);
	
}

void hal_gicc_pf9_init()
{
	//使能
	GICC->CTRL &=(~(0x1<<0));
	GICC->CTRL |=(0x1<<0);

	//设置GICC层中断优先级寄存器
	//GICC->PMR &=(~(0x1f<<3));
	GICC->PMR |=(0x1f<<3);
}





void hal_exti_pf7_init()
{

	//GPIO章节初始化
	GPIOF->MODER &=(~(0x3<<14));

	//exti章节初始化修改后，前为3
	EXTI->EXTICR2 &=(~(0xff<<24));
	EXTI->EXTICR2 |=(0x05<<24);

	//设置为下降沿模式
	EXTI->FTSR1 &=(~(0x1<<7));
	EXTI->FTSR1 |=(0x1<<7);

	//设置为中断不屏蔽
	EXTI->C1IMR1 &=(~(0x1<<7));
	EXTI->C1IMR1 |=(0x1<<7);

}


void hal_gicd_pf7_init()
{
	//使能对应组中断
	GICD->CTRL &=(~(0x1<<0));
	GICD->CTRL |=(0x1<<0);

	//设置GICD层中断使能寄存器
	GICD->ISENABLER[3] |=(0x1<<1);

	//设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[24] &=(~(0x1f<<11));
	GICD->IPRIORITYR[24] |=(0x1<<11);

	//设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[24] &=(~(0x3<<8));
	GICD->ITARGETSR[24] |=(0x1<<8);
	
}

void hal_gicc_pf7_init()
{
	//使能
	GICC->CTRL &=(~(0x1<<0));
	GICC->CTRL |=(0x1<<0);

	//设置GICC层中断优先级寄存器
	//GICC->PMR &=(~(0x1f<<3));
	GICC->PMR |=(0x1f<<3);
}


void hal_exti_pf8_init()
{

	//GPIO章节初始化
	GPIOF->MODER &=(~(0x3<<16));

	//exti章节初始化
	EXTI->EXTICR3 &=(~(0xff<<0));
	EXTI->EXTICR3 |=(0x5<<0);

	//设置为下降沿模式
	EXTI->FTSR1 &=(~(0x1<<8));
	EXTI->FTSR1 |=(0x1<<8);

	//设置为中断不屏蔽
	EXTI->C1IMR1 &=(~(0x1<<8));
	EXTI->C1IMR1 |=(0x1<<8);

}


void hal_gicd_pf8_init()
{
	//使能对应组中断
	GICD->CTRL &=(~(0x1<<0));
	GICD->CTRL |=(0x1<<0);

	//设置GICD层中断使能寄存器
	GICD->ISENABLER[3] |=(0x1<<2);

	//设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[24] &=(~(0x1f<<19));
	GICD->IPRIORITYR[24] |=(0x1<<19);

	//设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[24] &=(~(0x3<<16));
	GICD->ITARGETSR[24] |=(0x1<<16);
	
}

void hal_gicc_pf8_init()
{
	//使能
	GICC->CTRL &=(~(0x1<<0));
	GICC->CTRL |=(0x1<<0);

	//设置GICC层中断优先级寄存器
	GICC->PMR &=(~(0x1f<<3));
	GICC->PMR |=(0x1f<<3);
}

main.c

#include "key.h"

extern void printf(const char *fmt, ...);

void delay_ms(int ms)

{

	int i,j;

	for(i = 0; i < ms;i++)

		for (j = 0; j < 1800; j++);

}





int main()

{

	hal_exti_pf9_init();

	hal_gicd_pf9_init();

	hal_gicc_pf9_init();

	hal_exti_pf7_init();

	hal_gicd_pf7_init();

	hal_gicc_pf7_init();

	hal_exti_pf8_init();

	hal_gicd_pf8_init();

	hal_gicc_pf8_init();

	while(1)

	{

	}

	return 0;

}

do_irq.c

#include "key.h"
extern void printf(const char *fmt, ...);

unsigned int str=0;
//中断处理函数
void do_irq(void) 
{
	//获取中断号 IAR
	str=(GICC->IAR&0x3ff);

	//判断获取的中断号，进行打印
	if(99==str)
	{
		printf("key1\n");
		//清除对断挂起标志位
		EXTI->FPR1 &=(~(0x1<<9));
		EXTI->FPR1 |=(0x1<<9);

		//清除对应GICD层中断挂起标志位
		GICD->ICPENDR[3] &=(~(0x1<<3));
		GICD->ICPENDR[3] |=(0x1<<3);
	}
	else if(97==str)
	{
		//清除对断挂起标志位
		printf("key2\n");
		EXTI->FPR1 &=(~(0x1<<7));
		EXTI->FPR1 |=(0x1<<7);
		
		//清除对应GICD层中断挂起标志位
		GICD->ICPENDR[3] &=(~(0x1<<1));
		GICD->ICPENDR[3] |=(0x1<<1);
	}
	else if(98==str)
	{
		//清除对断挂起标志位
		printf("key3\n");
		EXTI->FPR1 &=(~(0x1<<8));
		EXTI->FPR1 |=(0x1<<8);
		
		//清除对应GICD层中断挂起标志位
		GICD->ICPENDR[3] &=(~(0x1<<2));
		GICD->ICPENDR[3] |=(0x1<<2);
	}



	//清除对应GIC层中断号???????????
	GICC->EOIR|=str;
}