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C语言 cortex-A7核按键中断实验【重点】

news 2025/8/18 15:38:54

一、KEY1

include/key.h

#ifndef __KEY_H__
#define __KEY_H__#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"//RCC/GPIO章节初始化
void hal_rcc_gpio_init();//EXTI章节初始化 ---> KEY1
void hal_exti_key1_init();//GIC章节初始化 ---> KEY1
void hal_gic_key1_init();#endif

src/key.c

#include "key.h"//KEY1 ---> PF9
//KEY2 ---> PF7
//KEY3 ---> PF8//RCC/GPIO章节初始化
void hal_rcc_gpio_init()
{//RCC章节初始化 //1.使能GPIOF组控制器 MP_AHB4ENSETR[5] = 1RCC->MP_AHB4ENSETR |= (0X1 << 5);//GPIO章节初始化//1.使能PF9引脚为输入模式 MODER[19:18] = 00GPIOF->MODER &= (~(0X3 << 18));//2.使能PF7引脚为输入模式 MODER[15:14] = 00GPIOF->MODER &= (~(0x3 << 14));	//3.使能PF8引脚为输入模式 MODER[17:16] = 00GPIOF->MODER &= (~(0x3 << 16));
}//EXTI章节初始化 ---> KEY1
void hal_exti_key1_init()
{//1.设置EXTI中断选择寄存器 PF9 ---> EXTI9  EXTICR3[15:8]=0x05EXTI->EXTICR3 &= (0xff << 8);EXTI->EXTICR3 |= (0x05 << 8);//2.设置PF9引脚，中断触发方式为下降沿触发  FTSR1[9]=1EXTI->FTSR1 |= (0x1 << 9);//3.设置EXTI层中断不屏蔽 IMR1[9]=1EXTI->C1IMR1 |= (0x1 << 9);
}//GIC章节初始化 ---> KEY1
void hal_gic_key1_init()
{//GICD章节初始化//1.设置GICD层使能组0 CTRL[0] = 1GICD->CTRL |= (0x1 << 0);	//2.设置GICD层中断层使能 ISENABLER[3] 第3位写1GICD->ISENABLER[3] |= (0x1 << 3);//3.设置GICD层中断优先级寄存器 IPRIORITYR[24] 第[31:27] = 00000GICD->IPRIORITYR[24] &= (~(0x1f << 27));//4.设置GICD层中断目标分配寄存器  给CPU0 ITARGETSR[24] 第[25:24] = 01GICD->ITARGETSR[24] &= (~(0x1 << 25));GICD->ITARGETSR[24] |= (0x1 << 24);//GICC章节初始化//1.使能GICC组0 CTLR[0] = 1GICC->CTRL |= (0x1 << 0);//2.设置KEY1 GICC层优先级 PMR[7:3] = 11111GICC->PMR |= (0x1f << 3);
}

src/do_irq.c

#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"extern void printf(const char *fmt, ...);void do_irq(void) 
{unsigned int interrupt_id;//获取中断号interrupt_id = GICC->IAR & (0x3ff);switch(interrupt_id){case 97:break;case 98:break;case 99:printf("key1 down!!!");printf("key1 ID = %d\n",interrupt_id);//清除EXTI层中断挂起标志位EXTI->FPR1 |= (0x1 << 9);//清除GICD层中断挂起标志位 ICPENDR[3] 第3位 = 1GICD->ICPENDR[3] |= (0x1 << 3);break;}//清除GICC中对应断号GICC->EOIR = interrupt_id; //将IAR寄存器中的中断号获取值，赋值给EOIR
}

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(){hal_rcc_gpio_init(); //RCC/GPIO章节初始化hal_exti_key1_init(); //EXTI章节初始化hal_gic_key1_init(); //GIC章节初始化while(1){}return 0;
}

二、封装函数

include/key.h

#ifndef __KEY_H__
#define __KEY_H__#include "stm32mp1xx_rcc.h"
#include "led.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"typedef enum{Falling, //下降沿Rising,  //上升沿
}trigger_t;//RCC/GPIO章节初始化
void hal_rcc_gpio_init();//void hal_exti_init(EXTI编号，GPIOF组号，触发方式);
void hal_exti_init(unsigned int EXTI_INPUT,unsigned int GPIOxGroup,trigger_t event_trigger);//void hal_gic_init(中断号，中断优先级);
void hal_gic_init(unsigned int interrupt_id,unsigned int priority);
#endif

src/key.c

#include "key.h"//KEY1 ---> PF9
//KEY2 ---> PF7
//KEY3 ---> PF8//RCC/GPIO章节初始化
void hal_rcc_gpio_init()
{//RCC章节初始化 //1.使能GPIOF组控制器 MP_AHB4ENSETR[5] = 1RCC->MP_AHB4ENSETR |= (0x1 << 5);//GPIO章节初始化//1.设置KEY1-->PF9引脚为输入模式 MODER[19:18] = 00GPIOF->MODER &= (~(0x3 << 18));//2.设置KEY2-->PF7引脚为输入模式 MODER[15:14] = 00GPIOF->MODER &= (~(0x3 << 14));//1.设置KEY3-->PF8引脚为输入模式 MODER[17:16] = 00GPIOF->MODER &= (~(0x3 << 16));
}//void hal_exti_init(EXTI编号，GPIOF组号，触发方式);
void hal_exti_init(unsigned int EXTI_INPUT,unsigned int GPIOxGroup,trigger_t event_trigger)
{//1.设置EXTI中断选择寄存器 PF9--->EXTI9 EXTICR3[15:8] = 0x05switch(EXTI_INPUT / 4){case 0:break;case 1:EXTI->EXTICR2 &= (~(0xff << (EXTI_INPUT % 4 * 8)));EXTI->EXTICR2 |= (GPIOxGroup << (EXTI_INPUT % 4 * 8));break;case 2:EXTI->EXTICR3 &= (~(0xff << (EXTI_INPUT % 4 * 8)));EXTI->EXTICR3 |= (GPIOxGroup << (EXTI_INPUT % 4 * 8));break;case 3:break;}//2.设置中断触发方式if(event_trigger == Falling){EXTI->FTSR1 |= (0x1 << EXTI_INPUT);}else{EXTI->RTSR1 |= (0x1 << EXTI_INPUT);}//3.设置EXTI层中断不屏蔽EXTI->C1IMR1 |= (0x1 << EXTI_INPUT);
}//void hal_gic_init(中断号，中断优先级);
void hal_gic_init(unsigned int interrupt_id,unsigned int priority)
{//GICD章节初始化 //1.设置GICD层使能组0 CTRL[0] = 1GICD->CTRL |= (0x1 << 0);//2.设置GICD层中断设置使能寄存器 GICD->ISENABLER[interrupt_id/32] |= (0x1 << (interrupt_id % 32));//3.设置GICD层中断优先级寄存器 GICD->IPRIORITYR[interrupt_id/4] &= (~(0x1f << (interrupt_id % 4 * 8 + 3)));GICD->IPRIORITYR[interrupt_id/4] |= (priority << (interrupt_id % 4 * 8 + 3));//4.设置GICD层中断目标分配寄存器 ITARGETSR[24] 第[25:24] = 01GICD->ITARGETSR[interrupt_id/4] &= (~(0x3 << (interrupt_id % 4 * 8)));GICD->ITARGETSR[interrupt_id/4] |= (0x1 << (interrupt_id % 4 * 8));//GICC章节初始化//1.设置GICC层使能组0 CTRL[0] = 1GICC->CTRL |= (0x1 << 0);//2.设置GICC层中断优先级寄存器 PMR[7:3] = 11111GICC->PMR &= (~(0x1f << 3));GICC->PMR |= (0x1f << 3);
}

src/do_irq.c

#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
#include "led.h"extern void printf(const char *fmt, ...);void do_irq(void) 
{unsigned int interrupt_id;//获取中断号 IDinterrupt_id = GICC->IAR & (0x3ff);switch(interrupt_id){case 97: //KEY2 ---> LED2 ---->PF10printf("key2 down!!!");printf("key2 ID = %d\n",interrupt_id);GPIOF->ODR ^= (0x1 << 10);//清除EXTI层中断挂起标志位 FPR1[7] = 1EXTI->FPR1 |= (0x1 << 7);//清除GICD层中断挂起标志位 ICPENDR[3]第一位写1GICD->ICPENDR[3] |= (0x1 << 1);break;case 98: //KEY3 ---> LED1 ---->PE10printf("key3 down!!!");printf("key3 ID = %d\n",interrupt_id);GPIOE->ODR ^= (0x1 << 10);//清除EXTI层中断挂起标志位 FPR1[8] = 1EXTI->FPR1 |= (0x1 << 8);//清除GICD层中断挂起标志位 ICPENDR[3]第2位写1GICD->ICPENDR[3] |= (0x1 << 2);break;case 99: //KEY1 ---> LED3 ----> PE8printf("key1 down!!!");printf("key1 ID = %d\n",interrupt_id);GPIOE->ODR ^= (0x1 << 8);//清除EXTI层中断挂起标志位 FPR1[9] = 1EXTI->FPR1 |= (0x1 << 9);//清除GICD层中断挂起标志位 ICPENDR[3]第三位写1GICD->ICPENDR[3] |= (0x1 << 3);break;}//清除GICC层中断号 EOIRGICC->EOIR = interrupt_id;
}

main.c

#include "led.h"#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(){//GPIOE组/GPIOF组使能RCC_MP_AHB4ENSETR |= (0x3 << 4);//结构体初始化gpio_init_t init = {OUTPUT,PP,LOW,NO_PU_PD};hal_gpio_init(GPIOE,GPIO_PIN_10,&init);hal_gpio_init(GPIOF,GPIO_PIN_10,&init);hal_gpio_init(GPIOE,GPIO_PIN_8,&init);}int main(){led_init();// LED1灯初始化//key1 ----> PF9 hal_rcc_gpio_init();hal_exti_init(9,0x05,Falling);hal_gic_init(99,9);//key2 ----> PF7 hal_exti_init(7,0x05,Falling);hal_gic_init(97,7);//key3 ----> PF8hal_exti_init(8,0x05,Falling);hal_gic_init(98,8);while(1){}return 0;}

调用：include/led.h

#ifndef __LED_H__
#define __LED_H__//LED1 ---> PE10
//LED2 ---> PF10
//LED3 ---> PE8//结构体封装
typedef struct{volatile unsigned int MODER;  // 0x00volatile unsigned int OTYPER; // 0x04volatile unsigned int OSPEEDR; //0x08volatile unsigned int PUPDR; //0x0cvolatile unsigned int IDR; //0x10volatile unsigned int ODR; //0x14
}gpio_t;//GPIOE组基地址 0x50006000
#define GPIOE ((gpio_t*)0x50006000)//GPIOF组基地址 0x50007000
#define GPIOF ((gpio_t*)0x50007000)#define RCC_MP_AHB4ENSETR (*(volatile unsigned int*)0x50000A28)//引脚编号封装
#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//模式寄存器封装
typedef enum{INPUT, //输入模式OUTPUT, //输出模式ALT, //复用功能模式ANALOG, //模拟模式
}gpio_moder_t;//输出类型寄存器封装
typedef enum{PP,//推挽OD,//开漏
}gpio_otyper_t;//输出速率寄存器封装
typedef enum{LOW,//低速MED,//中速HIGH,//高速VERY_HIGH,//快速
}gpio_ospeedr_t;//是否需要上下拉电阻进行封装
typedef enum{NO_PU_PD,//禁止上下拉电阻PU,//上拉PD,//下拉
}gpio_pupdr_t;//封装初始化结构体
typedef struct{gpio_moder_t moder; //模式相关寄存器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;//输出高低电平
typedef enum{GPIO_RESET_T,//低电平GPIO_SET_T,//高电平
}gpio_status_t;//函数功能:gpio相关初始化操作
//参数1：GPIO组编号
//参数2：GPIO引脚编号
//参数3：初始化相关内容
//返回值：无
void hal_gpio_init(gpio_t* gpiox,unsigned int pin,gpio_init_t* init);//函数功能:gpio写相关操作
//参数1：GPIO组编号
//参数2：GPIO引脚编号
//参数3：写值 写1高电平  写0低电平
//返回值：无
void hal_gpio_write(gpio_t* gpiox,unsigned int pin,gpio_status_t status);#endif

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