《ARM》cortex-A7核按键中断实验小作业

目录

代码：

1.key.h

2.key.c

3.main.c

执行结果：

---

代码：

1.key.h

#ifndef __GPIO_H__
#define __GPIO_H__

#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
//初始化EXTI层
void pf9_exti_init();
//初始化GICD层
void pf9_gicd_init();
//初始化GICC层
void pf9_gicc_init();



#endif

2.key.c

#include "gpio.h"

//初始化EXTI层
void pf9_exti_init()
{
	//RCC章节初始化
	RCC->MP_AHB4ENSETR |= (0X1 << 5);


	//GPIO章节初始化
	//1.设置PF9引脚为输入模式
	GPIOF->MODER &= (~(0x3 << 18));
	GPIOF->MODER &= (~(0x3 << 14));
	GPIOF->MODER &= (~(0x3 << 16));


	//EXTI章节初始化
	//1.设置PF9引脚和EXTI9控制器进行连接
	EXTI->EXTICR3 &= (~(0xff << 8));
	EXTI->EXTICR3 |= (0x05 << 8);
	
	EXTI->EXTICR2 &= (~(0xff << 24));
	EXTI->EXTICR2 |= (0x05 << 24);

	EXTI->EXTICR3 &= (~(0xff << 0));
	EXTI->EXTICR3 |= (0x05 << 0);
	//2.设置PF9引脚检测方式下降沿
	EXTI->FTSR1 |= (0x1 << 9);
	EXTI->FTSR1 |= (0x1 << 7);
	EXTI->FTSR1 |= (0x1 << 8);
	//3.设置PF9引脚中断不屏蔽
	EXTI->C1IMR1 |= (0x1 << 9);
	EXTI->C1IMR1 |= (0x1 << 7);
	EXTI->C1IMR1 |= (0x1 << 8);
}

//初始化GICD层
void pf9_gicd_init()
{
	//1.设置GICD层全局中断使能寄存器
	GICD->CTRL |= (0x1 << 0);
	//2.设置GICD层中断使能寄存器
	GICD->ISENABLER[3] |= (0x1 << 3);
	GICD->ISENABLER[3] |= (0x1 << 1);
	GICD->ISENABLER[3] |= (0x1 << 2);
	//3.设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[24] |= (0x3 << 27);
	GICD->IPRIORITYR[24] |= (0x3 << 11);
	GICD->IPRIORITYR[24] |= (0x3 << 19);
	//4.设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[24] &= (~(0x3 << 24));
	GICD->ITARGETSR[24] |= (0x1 << 24);
	GICD->ITARGETSR[24] &= (~(0x3 << 8));
	GICD->ITARGETSR[24] |= (0x1 << 8);
	GICD->ITARGETSR[24] &= (~(0x3 << 16));
	GICD->ITARGETSR[24] |= (0x1 << 16);
}
//初始化GICC层
void pf9_gicc_init()
{
	//1.设置GICC层全局中断使能寄存器
	GICC->CTRL |= (0x1 << 0);
	//2.设置GICC层中断优先级寄存器
	GICC->PMR |= (0x1 << 0);
}

3.main.c

#include "gpio.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()

{

	//EXTI初始化

	pf9_exti_init();

	//GICD初始化

	pf9_gicd_init();

	//GICC初始化

	pf9_gicc_init();

	while(1)

	{

		

	}

	return 0;

}

执行结果：