Cortex-A7核按键中断实验

作业要求：

按下按键之后，打印一句话------>三个按键需要实现

例如:当按键1按下之后，打印11111111

 头文件：

#ifndef __INTERRPUT_H__
#define __INTERRPUT_H__
 
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
 
//EXTI控制器初始化
void hal_exti_init();

//GICD控制器初始化
void hal_gicd_init();

//GICC控制器初始化
void hal_gicc_init();
 
#endif

 源文件：

#include "interrput.h"

//EXTI控制器初始化
void hal_exti_init()
{
	//RCC控制器初始化
	RCC->MP_AHB4ENSETR |= (0x1 << 5);
	//GPIO控制器初始化
	GPIOF->MODER &= (~(0x3 << 18));
	GPIOF->MODER &= (~(0x3 << 14));
	GPIOF->MODER &= (~(0x3 << 16));
	//EXTI控制器初始化
	EXTI->EXTICR3 &=(~(0xff << 8));
	EXTI->EXTICR3 |=(0x05 << 8);

	EXTI->EXTICR2 &=(~(0xff << 24));
	EXTI->EXTICR2 |=(0x05 << 24);

	EXTI->EXTICR3 &=(~(0xff << 0));
	EXTI->EXTICR3 |=(0x05 << 0);

	EXTI->FTSR1 |= (0x1 << 9);
	EXTI->FTSR1 |= (0x1 << 7);
	EXTI->FTSR1 |= (0x1 << 8);

	EXTI->C1IMR1 |= (0x1 << 9);
	EXTI->C1IMR1 |= (0x1 << 7);
	EXTI->C1IMR1 |= (0x1 << 8);
}

//GICD控制器初始化
void hal_gicd_init()
{
	GICD->CTRL |= (0x1 << 0);

	GICD->ISENABLER[3] |= (0x1<<3);
	GICD->ISENABLER[3] |= (0x1<<1);
	GICD->ISENABLER[3] |= (0x1<<2);


	GICD->IPRIORITYR[24] &= (~(0xf<<27));
	GICD->IPRIORITYR[24] |= (0x5<<27);

	GICD->IPRIORITYR[24] &= (~(0xf<<11));
	GICD->IPRIORITYR[24] &= (0x5<<11);

	GICD->IPRIORITYR[24] &= (~(0xf<<19));
	GICD->IPRIORITYR[24] &= (0x5<<19);


	GICD->ITARGETSR[24] &= (~(0x3<<24));
	GICD->ITARGETSR[24] |= (0b11<<24);

	GICD->ITARGETSR[24] &= (~(0x3<<8));
	GICD->ITARGETSR[24] |= (0b11<<8);

	GICD->ITARGETSR[24] &= (~(0x3<<16));
	GICD->ITARGETSR[24] |= (0b11<<16);

}

//GICC控制器初始化
void hal_gicc_init()
{
	GICC->CTRL |= (0x1 << 0);
	GICC->PMR &= (~(0x1f << 3));
	GICC->PMR |= (0x1f << 3);

}

 中断处理函数文件：

#include "interrput.h"

extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
    	int flag;
		//获取中断号
		flag = GICC->IAR;
		if(99==flag)
		{
			printf("1111111\n");
		}
		else if(97==flag)
		{
			printf("22222222\n");
		}
		else if(98==flag)
		{
			printf("3333333\n");
		}

		GICC->EOIR=flag;
		
		EXTI->FPR1 |= (0x1 << 9);
		EXTI->FPR1 |= (0x1 << 7);
		EXTI->FPR1 |= (0x1 << 8);


		GICD->ICPENDR[3] |= (0x1<<3);
		GICD->ICPENDR[3] |= (0x1<<1);
		GICD->ICPENDR[3] |= (0x1<<2);
}

 测试文件：

#include "interrput.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()
{
    //初始化
    hal_exti_init();
	hal_gicd_init();
	hal_gicc_init();
	
    while(1)
    return 0;
} 

 实验现象：