【ARM】Day8 中断

1. 思维导图

2. 实验要求： 实现KEY1/LEY2/KE3三个按键，中断触发打印一句话，并且灯的状态取反 key1 ----> LED3灯状态取反 key2 ----> LED2灯状态取反 key3 ----> LED1灯状态取反

key3.h

#ifndef __KEY3_H__
#define __KEY3_H__#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_uart.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"//key1-->PF9
//key2-->PF7
//key3-->PF8typedef enum
{EXTI1 = 1,EXTI2,EXTI3,EXTI4,EXTI5,EXTI6,EXTI7,EXTI8,EXTI9,EXTI10,EXTI11,EXTI12,EXTI13,EXTI14,EXTI15
}exti_event_t;//终端触发方式
typedef enum
{RISING_TRIGGER = 0,FALLING_TRIGGER
} trigger_t;void hal_exti_init(exti_event_t exti_event,unsigned int ground,trigger_t trigger); 	//RCC/GPIO/EXTI章节初始化
void hal_gic_init(unsigned int interruptid,unsigned int priority) ; 	//GIC章节初始化#endif

led.h

#ifndef _LED_H__   //防止头文件重复包含_
#define _LED_H__#include "stm32mp1xx_gpio.h"//RCC_MP_AHB4ENSETR寄存器封装
#define	RCC_MP_AHB4ENSETR (*(volatile unsigned int*)0x50000A28)//对引脚编号进行封装
#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//使用枚举封装MODER寄存器
typedef enum{INPUT,	//输入 0OUTPUT,	//输出 1ALT,	//复用 2ANALOG	//模拟 3
}gpio_moder_t;//使用枚举封装OTYPER寄存器
typedef enum{PP,	//推挽 0DP	//开漏 1
}gpio_otyper_t;//使用枚举封装OSPEEDR寄存器
typedef enum{LOWSPEED,	//低速 0MEDSPEED,	//中速 1HIGHSPEED,	//高速 2VERYHIGHSPEED	//快速 3 
}gpio_ospeedr_t;//使用枚举封装PURDR寄存器
typedef enum{NO_PUPDR,	//禁止上下拉电阻 0PU,	//上拉 1PD	//下拉 2
}gpio_pupdr_t;//封装初始化结构体
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;	//是否上下电阻寄存器
}gpio_init_t;//使用枚举封装ODR寄存器
typedef enum{GPIO_RESET_T,	//熄灭 0GPIO_SET_T	//点亮 1
}gpio_status_t;//函数功能:GPIO引脚初始化操作
//参数1:GPIO组号
//参数2:引脚编号
//参数3:初始化内容
void hal_gpio_init(volatile gpio_t * gpiox,unsigned int pin,gpio_init_t* init);//函数功能:GPIO引脚操作,写1点亮,写0熄灭
//参数1:GPIO组号
//参数2:引脚编号
//参数3:写的内容
void hal_gpio_write(volatile gpio_t* gpiox,unsigned int pin,gpio_status_t status);#endif

key3.c

#include "key3.h"//key1 -----> PF9
//key2 -----> PF7
//key3 -----> PF8
void hal_exti_init(exti_event_t exti_event,unsigned int ground,trigger_t trigger) 	//RCC/GPIO/EXTI章节初始化
{//RCC章节初始化//使能GPIOF组控制器  -----> RCC_MP_AHB4ENSETR[5] = 1RCC->MP_AHB4ENSETR |= (0x1 << 5);//GPIO章节初始化//设置KEY1按键为输入模式  -----> GPIOF_MODER[19:18] = 00//设置KEY2按键为输入模式  -----> GPIOF_MODER[15:14] = 00//设置KEY3按键为输入模式  -----> GPIOF_MODER[17:16] = 00GPIOF->MODER &= (~(0x3f << 14));//EXTI章节初始化//1、EXTI_EXTICRn(n=1~4):EXTI external interrupt selection register  ===> 外部中断选择寄存器, //设置KEY1按键与EXTI9进行连接,EXTI_EXTICR3[15:8] = 0x05,//设置KEY2按键与EXTI7进行连接,EXTI_EXTICR2[31:24] = 0x05//设置KEY1按键与EXTI8进行连接,EXTI_EXTICR3[7:0] = 0x05switch(exti_event / 4){case 0:EXTI->EXTICR1 &= (~(0xff << (exti_event % 4 *8)));EXTI->EXTICR1 |= (ground << (exti_event % 4 *8));break;case 1:EXTI->EXTICR2 &= (~(0xff << (exti_event % 4 *8)));EXTI->EXTICR2 |= (ground << (exti_event % 4 *8));break;case 2:	EXTI->EXTICR3 &= (~(0xff << (exti_event % 4 *8)));EXTI->EXTICR3 |= (ground << (exti_event % 4 *8));break;case 3:	EXTI->EXTICR4 &= (~(0xff << (exti_event % 4 *8)));EXTI->EXTICR4 |= (ground << (exti_event % 4 *8));break;default:break;}//2、下降沿触发选择寄存器,EXTI_FTSR1[9] = 1,EXTI_FTSR1[7] = 1,EXTI_FTSR1[8] = 1if(trigger == RISING_TRIGGER){EXTI->RTSR1 |= (0x1 << exti_event);}else if(trigger == FALLING_TRIGGER){EXTI->FTSR1 |= (0x1 << exti_event);}//3、设置中断屏蔽寄存器,EXTI_IMR1[9] = 1,EXTI_IMR1[7] = 1,EXTI_IMR1[8] = 1EXTI->C1IMR1 |= (0x1 << exti_event);
}void hal_gic_init(unsigned int interruptid,unsigned int priority) 	//GIC章节初始化
{
//1.GICD章节初始化
//设置GICD层组0使能, GICD control register (GICD_CTLR):  GICD_CTLR[0] = 1GICD->CTRL |= 1;
//设置GICD层中断使能,GICD interrupt set-enable register x (GICD_ISENABLERx)//key1 ----> PF9  ----> EXTI9 ----> 中断号99 ---->  99 / 32 = 3.......3 ----> GICD_ISENABLER3[3] = 1//key2 ----> PF7  ----> EXTI7 ----> 中断号97 ---->  97 / 32 = 3.......1 ----> GICD_ISENABLER3[1] = 1//key3 ----> PF8  ----> EXTI8 ----> 中断号98 ---->  98 / 32 = 3.......2 ----> GICD_ISENABLER3[2] = 1GICD->ISENABLER[interruptid / 32] |= (0x1 << (interruptid % 32));
//设置GICD层中断优先级寄存器,GICD interrupt priority register x (GICD_IPRIORITYRx)//key1 ----> PF9  ----> EXTI9 ----> 中断号99 ---->  99 / 4 = 24.......3 ----> GICD_IPRIORITYR24[31:27] = 0b00000//key2 ----> PF7  ----> EXTI7 ----> 中断号97 ---->  97 / 4 = 24.......1 ----> GICD_IPRIORITYR24[15:11]  = 0b00000//key3 ----> PF8  ----> EXTI8 ----> 中断号98 ---->  98 / 4 = 24.......2 ----> GICD_IPRIORITYR24[23:19]  = 0b0000GICD->IPRIORITYR[interruptid / 4] &= (~(0x1f << (interruptid % 4 * 8+3)));GICD->IPRIORITYR[interruptid / 4] |= (priority << (interruptid % 4 * 8+3));
//设置GICD层中断目标分配给CPU0,GICD interrupt processor target register x (GICD_ITARGETSRx)//key1 ----> PF9  ----> EXTI9 ----> 中断号99 ---->  99 / 4 = 24.......3 ----> GICD_ITARGETSR24[25:24] =  0b01 //key2 ----> PF7  ----> EXTI7 ----> 中断号97 ---->  97 / 4 = 24.......1 ----> GICD_ITARGETSR24[9:8]   =  0b01 //key3 ----> PF8  ----> EXTI8 ----> 中断号98 ---->  98 / 4 = 24.......2 ----> GICD_ITARGETSR24[17:16]   =  0b01 GICD->ITARGETSR[interruptid / 4] &= (~(0x3 << (interruptid % 4 * 8)));GICD->ITARGETSR[interruptid / 4] |= (0x1 << (interruptid % 4 * 8));//2.GICC章节初始化//设置GICC层组0使能,GICC input priority mask register (GICC_PMR),GICC_CTLR[0] = 1GICC->CTRL |= 1;//设置GICC层中断优先级寄存器,GICC control register (GICC_CTLR),GICC_PMR[7:3] = 0b11111GICC->PMR |= (0x1f << 3);
}

led.c

#include "led.h"//函数功能:GPIO引脚初始化操作
//参数1:GPIO组号
//参数2:引脚编号
//参数3:初始化内容
void hal_gpio_init(volatile gpio_t* gpiox,unsigned int pin,gpio_init_t* init)
{//1. 设置GPIO引脚模式gpiox->MODER &= (~(0x3 << (pin*2)));gpiox->MODER |= (init->moder << (pin*2));//2. 设置GPIO引脚输出类型gpiox->OTYPER &= (~(0x1<<pin));gpiox->OTYPER |= (init->otyper << pin);//3. 设置GPIO引脚输出速率gpiox->OSPEEDR &= (~(0x3 << (pin*2)));gpiox->OSPEEDR |= (init->ospeedr << (pin*2));//4. 设置GPIO引脚是否需要上下拉电阻gpiox->PUPDR &= (~(0x3 << (pin*2)));gpiox->PUPDR |= (init->pupdr << (pin*2));
}//函数功能:GPIO引脚操作,写1点亮,写0熄灭
//参数1:GPIO组号
//参数2:引脚编号
//参数3:写的内容
void hal_gpio_write(volatile gpio_t* gpiox,unsigned int pin,gpio_status_t status)
{if(status == GPIO_RESET_T)	//熄灭{gpiox->ODR &= (~(0x1<<pin));}else if(status == GPIO_SET_T) 	//点亮{gpiox->ODR |= (0x1<<pin);}
}

do_irq.c

extern void printf(const char *fmt, ...);
unsigned int i = 0;#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "led.h"//中断处理函数
void do_irq(void) 
{//1.获取中断号 IAR[9:0]unsigned int interrupt_id = GICC->IAR & (0x3ff);//2.判断终端号,并执行相关操作......switch(interrupt_id){case 99:printf("key1键按下\n");GPIOE->ODR ^= (0x1 << 8);	//LED3, PE8//3.清除EXTI层中断挂起标志位EXTI->FPR1 |= (0x1 << 9);  //key1//4.清除GICD层中断挂起标志位GICD->ICPENDR[3] |= (0x1 << 3);  //ke1break;case 97:printf("key2键按下\n");GPIOF->ODR ^= (0x1 << 10);	//LED2, PF10//3.清除EXTI层中断挂起标志位EXTI->FPR1 |= (0x1 << 7);  //key2//4.清除GICD层中断挂起标志位GICD->ICPENDR[3] |= (0x1 << 1);  //key2break;	case 98:printf("key3键按下\n");GPIOE->ODR ^= (0x1 << 10);	//LED1, PE10//3.清除EXTI层中断挂起标志位EXTI->FPR1 |= (0x1 << 8);  //key3//4.清除GICD层中断挂起标志位GICD->ICPENDR[3] |= (0x1 << 2);  //key3break;}//5.清除中断号GICC->EOIR = interrupt_id;}

main.c

#include "key3.h"
#include "led.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++);
}#define GPIOF_GROUP 0x05
#define KEY1_ID 99
#define KEY2_ID 97
#define KEY3_ID 98int main()
{RCC_MP_AHB4ENSETR |= (0x3<<4);	//使能GPIOE/GPIOF组gpio_init_t init = {OUTPUT,PP,LOWSPEED,NO_PUPDR};  //初始化GPIO结构体//初始化LED灯hal_gpio_init(GPIOE,GPIO_PIN_10,&init);	//LED1, PE10hal_gpio_init(GPIOF,GPIO_PIN_10,&init);	//LED2, PF10hal_gpio_init(GPIOE,GPIO_PIN_8,&init);	//LED3, PE8hal_exti_init(EXTI9,GPIOF_GROUP, FALLING_TRIGGER) ; //key1初始化hal_exti_init(EXTI7,GPIOF_GROUP, FALLING_TRIGGER) ; //key2初始化hal_exti_init(EXTI8,GPIOF_GROUP, FALLING_TRIGGER) ; //key3初始化hal_gic_init(KEY1_ID,9);hal_gic_init(KEY2_ID,7);hal_gic_init(KEY3_ID,8);while(1){	}return 0;
}

运行结果：