cortex-A7核中断实验（库）

key.h:

cpp 复制代码

#ifndef __KEY_H_
#define __KEY_H_

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

//中断触发方式
typedef enum{
	FALLING,
	RISING
}trigger_t;

//RCC章节初始化
void hal_interrupt_rcc_init();

//GPIO/EXTI章节初始化
void hal_exti_init(unsigned int EXTI_event,
		unsigned int GPIOx_group,trigger_t trigeer);

//GIC章节初始化
void hal_gic_init(unsigned int interrupt_id,unsigned int pro);


#endif

gpio.h:

cpp 复制代码

#ifndef __GPIO_H__
#define __GPIO_H__
//防止头文件重复包含

//LED1-->PE10
//LED2-->PF10
//LED3-->PE8

//RCC_MP_AHB4ENSETR寄存器封装
#define RCC_MP_AHB4ENSETR (*(volatile unsigned int*)0x50000A28)

//GPIO使用结构体封装
typedef struct{
	unsigned int MODER; //0x00
	unsigned int OTYPER; //0x04
	unsigned int OSPEEDR; //0x08
	unsigned int PUPDR; //0x0c
	unsigned int IDR; //0x10
	unsigned int ODR; //0x14
}gpio_t;
#define GPIOE ((volatile gpio_t*)0x50006000) //GPIOE基地址
#define GPIOF ((volatile gpio_t*)0x50007000) //GPIOF基地址

//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模式寄存器(INPUT/OUTPUT/ALT/ANALOG)
typedef enum{
	INPUT, // 输入 0
	OUTPUT, //输出 1
	ALT, // 复用 2
	ANALOG //模拟 3
}gpio_moder_t;

//使用枚举封装OTYPER寄存器
typedef enum{
	PP, // 推挽 0
	OD  // 开漏 1
}gpio_otyper_t;

//使用枚举封装OSPEEDR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;

//使用枚举封装PUPDR寄存器
typedef enum{
	NO_PUPDR, // 禁止上下拉电阻 0
	PU, // 上拉 1
	PD // 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;//是否需要上下拉电阻寄存器
}gpio_init_t;

//使用枚举封装ODR寄存器 
typedef enum{
	GPIO_RESET_T, // 熄灭 0
	GPIO_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 灯点亮 写0 灯熄灭
//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

key.c:

cpp 复制代码

#include "key.h"

//RCC/GPIO/EXTI章节初始化
void hal_interrupt_rcc_init()
{
	//RCC章节初始化
	//1.使能GPIOF组控制器 MP_AHB4ENSETR[5] = 1
	RCC->MP_AHB4ENSETR |= (0x1 << 5);
}

//RCC/GPIO/EXTI章节初始化
void hal_exti_init(unsigned int EXTI_event,
		unsigned int GPIOx_group,trigger_t trigeer)
{
	//设置三个按键为输入模式
	GPIOF->MODER &= (~(0x3 << (EXTI_event * 2)));
	//EXTI章节初始化
	//1.设置GPIO引脚与EXTIz组进行连接EXTICRn
	switch(EXTI_event / 4)
	{
		case 0:
			EXTI->EXTICR1 &= (~(0xff << (EXTI_event % 4 * 8)));
			EXTI->EXTICR1 |= (GPIOx_group << (EXTI_event % 4 * 8));
			break;
		case 1:
			EXTI->EXTICR2 &= (~(0xff << (EXTI_event % 4 * 8)));
			EXTI->EXTICR2 |= (GPIOx_group << (EXTI_event % 4 * 8));
			break;
		case 2:
			EXTI->EXTICR3 &= (~(0xff << (EXTI_event % 4 * 8)));
			EXTI->EXTICR3 |= (GPIOx_group << (EXTI_event % 4 * 8));
			break;
		case 3:
			EXTI->EXTICR4 &= (~(0xff << (EXTI_event % 4 * 8)));
			EXTI->EXTICR4 |= (GPIOx_group << (EXTI_event % 4 * 8));
			break;
	}
	//2.设置三个按键为下降沿触发方式 FTSR1
	if(trigeer == FALLING)
	{
		EXTI->FTSR1 |= (0x1 << EXTI_event);
	}else
	{
		EXTI->RTSR1 |= (0x1 << EXTI_event);
	}
	//3.设置EXTI中断不屏蔽 C1IMR1
	EXTI->C1IMR1 |= (0x1 << EXTI_event);
}


//GIC章节初始化
void hal_gic_init(unsigned int interrupt_id,unsigned int pro)
{
	//GICD章节初始化
	//1.设置GICD层中断设置使能寄存器 
	GICD->CTRL |= (0x1 << 0);
	GICD->ISENABLER[interrupt_id / 32] |= (0x1 << (interrupt_id % 32));
	//2.设置GICD层中断优先级寄存器 IPRIORITYR
	GICD->IPRIORITYR[interrupt_id / 4] &= (~(0x1f << (interrupt_id % 4 * 8 + 3)));
	GICD->IPRIORITYR[interrupt_id / 4] |= (pro << (interrupt_id % 4 * 8 + 3));

	//3.设置中断目标分配寄存器 ITARGETSR[24]
	GICD->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层中断设置使能寄存器 CTRL[0] = 1
	GICC->CTRL |= (0x1 << 0);
	//2.设置GICC层中断优先级寄存器 PMR[7:3] = 0b11111
	GICC->PMR |= (0x1f << 3);
}

do_irq:

cpp 复制代码

#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "gpio.h"

extern void printf(const char *fmt, ...);
//中断处理函数
void do_irq(void) 
{
	unsigned int num;
	//1.获取中断号 IAR[9:0]
	num = GICC->IAR & (0x3ff);
	//2.判断中断号，并且打印一句话
	switch(num)
	{
	case 97:
		printf("key2 down!!!!\n");
		GPIOF->ODR ^= (0x1 << 10); //LED2
		//3.清除EXTI层中断挂起标志位 FPR1[7] = 1
		EXTI->FPR1 |= (0x1 << 7);
		//4.清除GICD层中断挂起标志位 ICPENDR[3]第1位
		GICD->ICPENDR[3] |= (0x1 << 1);
		break;
	case 98:
		printf("key3 down!!!!\n");
		GPIOE->ODR ^= (0x1 << 10); //LED1
		//3.清除EXTI层中断挂起标志位 FPR1[8] = 1
		EXTI->FPR1 |= (0x1 << 8);
		//4.清除GICD层中断挂起标志位 ICPENDR[3]第2位
		GICD->ICPENDR[3] |= (0x1 << 2);
		break;
	case 99:
		printf("key1 down!!!!\n");
		GPIOE->ODR ^= (0x1 << 8); //LED3
		//3.清除EXTI层中断挂起标志位 FPR1[9] = 1
		EXTI->FPR1 |= (0x1 << 9);
		//4.清除GICD层中断挂起标志位 ICPENDR[3]第三位
		GICD->ICPENDR[3] |= (0x1 << 3);
		break;
	}
	//5.清除获取到中断号 EOIR
	GICC->EOIR = num;
}