Cortex-A7核按键中断实验

完成Cortex-A7核按键中断实验

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()
{
	gpio_init();
	key1_exti_init();
	key1_gic_init();
	key2_exti_init();
	key2_gic_init();
	key3_exti_init();
	key3_gic_init();

	led1_init();
	led2_init();
	led3_init();
	
	while(1);
 
    return 0;
}

key.h:

#ifndef __KEY_H__
#define __KEY_H__

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

//GPIO章节初始化
void gpio_init();

//EXTI章节初始化
void key1_exti_init();
void key2_exti_init();
void key3_exti_init();

//GIC层章节初始化
void key1_gic_init();
void key2_gic_init();
void key3_gic_init();

//LED1初始化
void led1_init();
//LED1点亮
void led1_on();
//LED1熄灭
void led1_off();
//LED2初始化
void led2_init();
//LED2点亮
void led2_on();
//LED2熄灭
void led2_off();
//LED3初始化
void led3_init();
//LED3点亮
void led3_on();
//LED3熄灭                                              
void led3_off();

#endif

key.c:

#include "key.h"
void gpio_init()
{
	//RCC章节使能GPIOF MP_AHB4ENSETR[5]:1
	RCC->MP_AHB4ENSETR |=(0x1<<5);
	//GPIOF_MODER设置按键为输入模式　[19:18] [15:14] [17:16] 00
	GPIOF->MODER &=(~(0x3<<18));
	GPIOF->MODER &=(~(0x3<<14));
	GPIOF->MODER &=(~(0x3<<16));
}

void key1_exti_init()
{
	//EXTI_EXTICR3[15:8]:0x05
	EXTI->EXTICR3 &=(~(0xff<<8));
	EXTI->EXTICR3 |=(0x05<<8);
	//EXTI_FTSR1[9] = 1
	EXTI->FTSR1 |=(0x1<<9);
	//EXTI_IMR1[9] = 1
	EXTI->C1IMR1 |=(0x1<<9);
}
void key2_exti_init()
{
	//EXTI_EXTICR2[31:24] = 0x05
	EXTI->EXTICR2 &=(~(0xff<<24));
	EXTI->EXTICR2 |=(0x05<<24);
	//EXTI_FTSR1[7] = 1
	EXTI->FTSR1 |=(0x1<<7);
	//EXTI_IMR1[7] = 1
	EXTI->C1IMR1 |=(0x1<<7);
}
void key3_exti_init()
{
	//EXTI_EXTICR3[7:0] = 0x05
	EXTI->EXTICR3 &=(~0xff);
	EXTI->EXTICR3 |=(0x05);
	//EXTI_FTSR1[8] = 1
	EXTI->FTSR1 |=(0x1<<8);
	//EXTI_IMR1[8] = 1
	EXTI->C1IMR1 |=(0x1<<8);
}


void key1_gic_init()
{
	//GICD
	//使能GICD层GICD_CTLR[0] = 1
	GICD->CTRL |=(0x1);
	//GICD_ISENABLER3[3] = 1
	GICD->ISENABLER[3] |=(0x1<<3);
	//GICD_IPRIORITYR24[31:27] 
	//GICD层设置的中断优先级，需要比GICC层中断优先级高，中断的值设置的越小，优先级越高
	GICD->IPRIORITYR[24] |=(0x1<<27);
	//中断目标分配寄存器,GICD_ITARGETSR24[25:24] 0x01,分配给cpu0
	GICD->ITARGETSR[24] &=(~(0x3<<24));
	GICD->ITARGETSR[24] |=(0x1<<24);

	//GICC
	//CTLR[0] = 1 -----> GICC层使能
	GICC->CTRL |=(0x1);
	//GICC_PMR[7:3]设置GICC中断优先级屏蔽寄存器
	GICC->PMR |=(0x1f<<3);

}

void key2_gic_init()
{
	//GICD
	//使能GICD层GICD_CTLR[0] = 1
	GICD->CTRL |=(0x1);
	//GICD_ISENABLER3[1] = 1
	GICD->ISENABLER[3] |=(0x1<<1);
	//GICD_IPRIORITYR24[15:11]
	//GICD层设置的中断优先级，需要比GICC层中断优先级高，中断的值设置的越小，优先级越高
	GICD->IPRIORITYR[24] |=(0x1<<11);
	//中断目标分配寄存器,GICD_ITARGETSR24[9:8] 0x01,分配给cpu0
	GICD->ITARGETSR[24] &=(~(0x3<<8));
	GICD->ITARGETSR[24] |=(0x1<<8);

	//GICC
	//CTLR[0] = 1 -----> GICC层使能
	GICC->CTRL |=(0x1);
	//GICC_PMR[7:3]设置GICC中断优先级屏蔽寄存器
	GICC->PMR |=(0x1f<<3);

}
void key3_gic_init()
{
	//GICD
	//使能GICD层GICD_CTLR[0] = 1
	GICD->CTRL |=(0x1);
	//GICD_ISENABLER3[2] = 1
	GICD->ISENABLER[3] |=(0x1<<2);
	//GICD_IPRIORITYR24[23:19]
	//GICD层设置的中断优先级，需要比GICC层中断优先级高，中断的值设置的越小，优先级越高
	GICD->IPRIORITYR[24] |=(0x1<<19);
	//中断目标分配寄存器,GICD_ITARGETSR24[17:16] 0x01,分配给cpu0
	GICD->ITARGETSR[24] &=(~(0x3<<16));
	GICD->ITARGETSR[24] |=(0x1<<16);

	//GICC
	//CTLR[0] = 1 -----> GICC层使能
	GICC->CTRL |=(0x1);
	//GICC_PMR[7:3]设置GICC中断优先级屏蔽寄存器
	GICC->PMR |=(0x1f<<3);

}



void led1_init()
{
    //gcc章节
    RCC->MC_AHB4ENSETR |=(0x1<<4);
    //GPIO章节
    //MODER (21:20) 01
    GPIOE->MODER &=(~(0x1<<21));
    GPIOE->MODER |=(0x1<<20);
    //OTYPER  (10) 0
    GPIOE->OTYPER &=(~(0x1<<10));
    //OSPEEDR (21:20) 00
    GPIOE->OSPEEDR &=(~(0x1<<20));
    GPIOE->OSPEEDR &=(~(0x1<<21));
    //PUPDR　 (21:20) 00
    GPIOE->PUPDR &=(~(0x1<<20));
    GPIOE->PUPDR &=(~(0x1<<21));
}
void led2_init()
{
    //gcc章节
    RCC->MC_AHB4ENSETR |=(0x1<<5);
    //GPIO章节
    //MODER (21:20) 01
    GPIOF->MODER &=(~(0x1<<21));
    GPIOF->MODER |=(0x1<<20);
    //OTYPER  (10) 0
    GPIOF->OTYPER &=(~(0x1<<10));
    //OSPEEDR (21:20) 00
    GPIOF->OSPEEDR &=(~(0x1<<20));
    GPIOF->OSPEEDR &=(~(0x1<<21));
    //PUPDR　 (21:20) 00
    GPIOF->PUPDR &=(~(0x1<<20));
    GPIOF->PUPDR &=(~(0x1<<21));
}
void led3_init()
{
    //gcc章节
    //GPIO章节
    //MODER (17:16) 01
    GPIOE->MODER &=(~(0x1<<17));
    GPIOE->MODER |=(0x1<<16);
    //OTYPER  (8) 0
    GPIOE->OTYPER &=(~(0x1<<8));
    //OSPEEDR (17:16) 00
    GPIOE->OSPEEDR &=(~(0x1<<16));
    GPIOE->OSPEEDR &=(~(0x1<<17));
    //PUPDR　 (17:16) 00
    GPIOE->PUPDR &=(~(0x1<<16));
    GPIOE->PUPDR &=(~(0x1<<17));
}
void led1_on()
{
    GPIOE->ODR |=(0x1<<10);                             
}

void led1_off()
{
    GPIOE->ODR &=(~(0x1<<10));
}

void led2_on()
{
    GPIOF->ODR |=(0x1<<10);
}

void led2_off()
{
    GPIOF->ODR &=(~(0x1<<10));
}
void led3_on()
{
    GPIOE->ODR |=(0x1<<8);
}

void led3_off()
{
    GPIOE->ODR &=(~(0x1<<8));
}

do_irq.c:

#include "key.h"
extern void printf(const char *fmt, ...);
extern void delay_ms();
unsigned int i = 0;
void do_irq(void) 
{
	int num;
	num=GICC->IAR;
	switch(num)
	{
	case 99:
		printf("key1!!!!!!!!!!!!!!!!!\n");
		led1_on();
		delay_ms(500);
		led1_off();

		//写1清除中断挂起标志位 EXTI_FPR1[9] = 1
		EXTI->FPR1 |=(0x1<<9);
		//清除GICD层挂起标志位 GICD_ISENABLER3[3] = 1
		GICD->ISENABLER[3] |=(0x1<<3);
		break;
	case 97:
		printf("key2!!!!!!!!!!!!!!!!!\n");
		led2_on();
		delay_ms(500);
		led2_off();

		//写1清除中断挂起标志位 EXTI_FPR1[7] = 1
		EXTI->FPR1 |=(0x1<<7);
		//清除GICD层挂起标志位 GICD_ISENABLER3[1] = 1
		GICD->ISENABLER[3] |=(0x1<<1);
		break;
	case 98:
		printf("key3!!!!!!!!!!!!!!!!!\n");
		led3_on();
		delay_ms(500);
		led3_off();

		//写1清除中断挂起标志位 EXTI_FPR1[8] = 1
		EXTI->FPR1 |=(0x1<<8);
		//清除GICD层挂起标志位 GICD_ISENABLER3[1] = 1
		GICD->ISENABLER[3] |=(0x1<<2);
	}

	//GICC_EOIR[9:0]:清除中断号
	GICC->EOIR |=num;

}

效果图：