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 0FALL_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 0OUPUT,	//输出 1ALT,	//复用 2ANALOG	//模拟 3
}gpio_moder_t;//OTYPER输出类型寄存器
typedef enum{PP,		//推挽 0OD		//开漏 1
}gpio_otyper_t;//OSPEEDR输出速率寄存器
typedef enum{LOW,		//低速 0MED,		//中速 1HIGH,		//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 1PD,			//下拉 2RES			//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] = 1RCC->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GPIOFunsigned 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] = 1EXTI->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] = 1GICD->CTRL |= (0x1 << 0);//中断设置使能(99) ISENABLER[3]第3位写1GICD->ISENABLER[nod/32] |= (0X1 << (nod%32));//中断优先级设置  IPRIORITYR[24]第[31:27] = 0b00000GICD->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] = 0b01GICD->ITARGETSR[nod/4] &= (~(0X3 << ((nod%4)*8)));GICD->ITARGETSR[nod/4] |= (0X1 << ((nod%4)*8));//2.GICC层//使能GICC层  CTRL[0] = 1GICC->CTRL |= (0X1 << 0);//输入中断优先级 PMR[7:3] = 0b11111GICC->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;
}