1.中断实验：按键控制led灯

流程：

key.h

/*************************************************************************
    > File Name: include/key.h
    > Created Time: 2023年08月21日 星期一 17时03分20秒
 ************************************************************************/

#ifndef __KEY_H__
#define __KEY_H__

//引脚编号封装
#define EXTI7 7
#define EXTI8 8
#define EXTI9 9

#define GPIO_PIN_0 0
#define GPIO_PIN_1 1
#define GPIO_PIN_2 2
#define GPIO_PIN_3 3
#define GPIO_PIN_4 4
#define GPIO_PIN_5 5
#define GPIO_PIN_6 6
#define GPIO_PIN_7 7
#define GPIO_PIN_8 8
#define GPIO_PIN_9 9
#define GPIO_PIN_10 10
#define GPIO_PIN_11 11
#define GPIO_PIN_12 12
#define GPIO_PIN_13 13
#define GPIO_PIN_14 14
#define GPIO_PIN_15 15

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

typedef enum{
	FALL_DIS,	//禁用下降沿 0
	FALL_EN		//启用下降沿 1
}exti_ftsr1_t;

//RCC/GPIO/EXTI章节初始化
void HAL_EXTI_INIT(unsigned int pin, unsigned int gp, exti_ftsr1_t falling);

//GIC章节初始化
void HAL_GIC_INIT(unsigned int nod, unsigned int first);
 

//***************点灯***************//
//MODER模式寄存器
typedef enum{
	INPUT,	//输入 0
	OUPUT,	//输出 1
	ALT,	//复用 2
	ANALOG	//模拟 3
}gpio_moder_t;

//OTYPER输出类型寄存器
typedef enum{
	PP,		//推挽 0
	OD		//开漏 1
}gpio_otyper_t;

//OSPEEDR输出速率寄存器
typedef enum{
	LOW,		//低速 0
	MED,		//中速 1
	HIGH,		//高速 2 
	VERY_HIGH	//快速 3
}gpio_ospeedr_t;

//PUPDR是否需要上下拉电阻寄存器
typedef enum{
	NO_PU_PD,	//禁止 0 
	PU,			//上拉 1
	PD,			//下拉 2
	RES			//保留 3
}gpio_pupdr_t;

typedef struct{
	gpio_moder_t moder;		//模式寄存器
	gpio_otyper_t otyper;	//输出类型寄存器
	gpio_ospeedr_t ospeedr;	//输出速率寄存器
	gpio_pupdr_t pupdr;		//是否需要上下拉电阻寄存器
}gpio_init_t;


//GPIO引脚初始化函数 PE10 PF10 PE8
//void hal_gpio_init(GPIO组编号，引脚编号，初始化的值)
void hal_gpio_initl(gpio_t* gpiox, unsigned int pin, gpio_init_t *gpio_init);

//GPIO引脚写操作函数 0：熄灭 1：点亮
//void hal_gpio_write(GPIO组编号，引脚编号，操作的值)
void hal_gpio_writel(gpio_t* gpiox, unsigned int pin);



#endif

key.c

/*************************************************************************
    > File Name: src/key.c
    > Created Time: 2023年08月21日 星期一 17时03分20秒
 ************************************************************************/

#include "key.h"

//RCC/GPIO/EXTI章节初始化
void HAL_EXTI_INIT(unsigned int pin, unsigned int gp, exti_ftsr1_t falling)
{
	//RCC使能GPIOF组 MP_AHB4ENSETR[5] = 1
	RCC->MP_AHB4ENSETR |= (0x1 << 5);

	//设置GPIOF引脚模式为输出
	GPIOF->MODER &= (~(0x3 << (pin*2)));

	//EXTI外部中断选择GPIOF
	unsigned int n = pin/4 + 1;
	switch (n)
	{
		case 3 :
			EXTI->EXTICR3 &= (~(0xff << ((pin%4)*8)));
			EXTI->EXTICR3 |= (gp << ((pin%4)*8));
			break;
		case 2:
			EXTI->EXTICR2 &= (~(0xff << ((pin%4)*8)));
			EXTI->EXTICR2 |= (gp << ((pin%4)*8));
			break;
	}
	//EXTI事件触发为下降沿
	EXTI->FTSR1 |= (falling << pin);
	
	//EXTI设置不屏蔽 C1IMR1[9] = 1
	EXTI->C1IMR1 |= (0X1 << pin);

}

//GIC章节初始化
void HAL_GIC_INIT(unsigned int nod, unsigned int first)
{
	//1.GICD层
	//使能GICD层 CTRL[0] = 1
	GICD->CTRL |= (0x1 << 0);

	//中断设置使能(99) ISENABLER[3]第3位写1
	GICD->ISENABLER[nod/32] |= (0X1 << (nod%32));

	//中断优先级设置  IPRIORITYR[24]第[31:27] = 0b00000
	GICD->IPRIORITYR[nod/4] &= (~(0x1f << ((nod%4)*8+3)));
	GICD->IPRIORITYR[nod/4] |= (first << ((nod%4)*8+3));

	//选择CPU0  ITARGETSR[24]第[25:24] = 0b01
	GICD->ITARGETSR[nod/4] &= (~(0X3 << ((nod%4)*8)));
	GICD->ITARGETSR[nod/4] |= (0X1 << ((nod%4)*8));
	
	//2.GICC层
	//使能GICC层  CTRL[0] = 1
	GICC->CTRL |= (0X1 << 0);

	//输入中断优先级 PMR[7:3] = 0b11111
	GICC->PMR |= (0x1f << 3);
}




//**************点灯******************//
void hal_gpio_initl(gpio_t* gpiox, unsigned int pin, gpio_init_t *gpio_init)
{
	//1.设置gpio引脚模式MODER 每两位管理一个引脚
	gpiox->MODER &= (~(0x3 << (pin * 2)));
	gpiox->MODER |= (gpio_init->moder << (pin * 2));

	//2.设置gpio引脚输出类型
	gpiox->OTYPER &= (~(0x1 << pin));
	gpiox->OTYPER |= (gpio_init->otyper << pin);

	//3.设置gpio引脚输出速率
	gpiox->OSPEEDR &= (~(0x3 << (pin * 2)));
	gpiox->OSPEEDR |= (gpio_init->ospeedr << (pin * 2));
	
	//4.设置gpio引脚禁止上下拉电阻
	gpiox->PUPDR &= (~(0x3 << (pin * 2)));
	gpiox->PUPDR |= (gpio_init->pupdr << (pin * 2));
}

void hal_gpio_writel(gpio_t* gpiox, unsigned int pin)
{	
		gpiox->ODR ^= (0x1 << pin);
}

do_lrq.c

#include "key.h"
 
extern void printf(const char *fmt, ...);
unsigned int i = 0;

void do_irq(void) 
{
	unsigned int num = 0;
 
	//获取中断号
	num = GICC->IAR & 0X3FF;
	switch (num)
	{
		case 99:
			{
				printf("***key1***\n");

				hal_gpio_writel(GPIOE, GPIO_PIN_8);

				//清除EXTI层挂起标志位
				EXTI->FPR1 |= (0x1 <<9);
 
				//清除GICD层挂起标志位
				GICD->ICPENDR[3] |= (0X1 <<3);
			}
			break;

		case 97:
			{
				printf("***key2***\n");
				hal_gpio_writel(GPIOF, GPIO_PIN_10);

				//清除EXTI层挂起标志位
				EXTI->FPR1 |= (0x1 <<7);

				//清除GICD层挂起标志位
				GICD->ICPENDR[3] |= (0X1 <<1);
			}
			break;

		case 98:
			{
				printf("***key3***\n");
				hal_gpio_writel(GPIOE, GPIO_PIN_10);

				//清除EXTI层挂起标志位
				EXTI->FPR1 |= (0x1 <<8);

				//清除GICD层挂起标志位
				GICD->ICPENDR[3] |= (0X1 <<2);
			}
			break;
	}
	//清除中断号
	GICC->EOIR &= (~(0X3FF));
	GICC->EOIR |= num;
}

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++);
}
 
void led_init()
{
	//初始化时钟 GPIOE和GPIOF组时钟使能
	RCC->MP_AHB4ENSETR |= (0x3 << 4);
	//结构体进行初始化
	//gpio_init_t init;
	//init.moder = OUPUT;
	//init.otyper = PP;
	//init.ospeedr = LOW;
	//init.pupdr = NO_PU_PD;
	gpio_init_t init = {OUPUT, PP, LOW, NO_PU_PD};
	hal_gpio_initl(GPIOE, GPIO_PIN_10, &init);
	hal_gpio_initl(GPIOF, GPIO_PIN_10, &init);
	hal_gpio_initl(GPIOE, GPIO_PIN_8, &init);
}
 
int main()
{
	led_init();

	HAL_EXTI_INIT(EXTI9, 0x05, FALL_EN);
	HAL_EXTI_INIT(EXTI7, 0x05, FALL_EN);
	HAL_EXTI_INIT(EXTI8, 0x05, FALL_EN);

	HAL_GIC_INIT(99, 9);
	HAL_GIC_INIT(97, 7);
	HAL_GIC_INIT(98, 8);

	while(1)
	{
	
	}
	return 0;
}