ARM day9 （按键中断控制led亮灭）-Toy模板网

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保存现场

异常的处理流程，保存现场会做哪些事情(四大步三小步) ---->CPU自动完成

1.保存CPSR寄存器中的值，到SPSR_<mode>寄存器中

2.修改CPSR寄存器对应的位

        1>修改CPSR寄存器对应的状态位(T位)

        2>根据需要，禁止相应中断位(I位 / F位)

        3>修改CPSR寄存器的模式位，修改为对应的异常模式

3.保存函数的返回地址到LR寄存器中

4.修改PC指针指向对应的异常向量表

恢复现场

1.恢复SPSR_<mode>寄存器中的值给到CPSR寄存器中

2.恢复LR寄存器中的值给到PC

ARM day9 （按键中断控制led亮灭）,ARM,arm开发,单片机,嵌入式硬件

key.h

#ifndef __KEY_H__
#define __KEY_H__

#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_uart.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"


//事件号
#define EXTI_7 7
#define EXTI_8 8
#define EXTI_9 9

//中断号
#define EXTI7 97
#define EXTI8 98
#define EXTI9 99

//key_exit初始化
void hal_key_exti_init(volatile unsigned int exti,gpio_t* gpiox,volatile unsigned int* style);

//key_gic初始化
void hal_key_gic_init(unsigned int extid);

/********LED*章节*********/
//寄存器的模型
typedef enum{
	INPUT,  	//输入 0
	OUTPUT,   	//输出 1 
	ALT, 		//2
	ANALOG, 	//3
}gpio_moder_t;
//寄存器输出类型
typedef enum{
	PP, 	//推挽 0
	OD, 	//开漏 1
}gpio_otyper_t;
//寄存器数据输出速率
typedef enum{
	LOW, 	//低速 00
	MED, 	//中速 01
	HIGH, 	//高速 10
	HIGHEST,//超高速 11
}gpio_ospeedr_t;
//上下拉电阻寄存器
typedef enum{
	NO_PUPDR, 	//禁止 0
	PU,  		//上拉 1
	PD, 		//下拉 2
}gpio_pupdr_t;

//高低电平
typedef enum{
	GPIO_RESET_T,  	//低电平 0
	GPIO_SET_T, 	//高电平 1
}gpio_odr_t;

typedef struct{
	gpio_moder_t moder; 	//引脚模式
	gpio_otyper_t otyper; 	//输出类型
	gpio_ospeedr_t ospeedr; //输出速度
	gpio_pupdr_t pupdr; 	//是否上下拉
}gpio_init_t;


//LED_GPIO初始化
void hal_led_gpio_init(gpio_t* gpiox,unsigned int pin,gpio_init_t* init);

//LED_操作
void operate_led(gpio_t* gpiox,unsigned int pin);

//LED_ON
void turn_on(gpio_t* gpiox,unsigned int pin);

//LED_OFF
void turn_off(gpio_t* gpiox,unsigned int pin);

#endif

key.c

#include "key.h"
extern void delay_ms(int ms);

//key_exit初始化
void hal_key_exti_init(unsigned int exti,gpio_t* gpiox,volatile unsigned int* style)
{
	//   RCC章节初始化
	//  1.GPIO使能
	//
	//unsigned int a = (unsigned int)(gpiox - GPIOA)/256;

	RCC->MP_AHB4ENSETR |= (0x1 << 5);

	//    GPIO章节初始化GPIOF_MODER
	gpiox->MODER &= (~(0x3 << exti*2));

	//   EXTI章节初始化 
	//2.设置EXTI选择寄存器 EXTI_EXITCRx
	*(&(EXTI->EXTICR1) + (exti/4)) &= (~(0xff << (exti%4)*8)); 
	*(&(EXTI->EXTICR1) + (exti/4)) |= (5 << (exti%4)*8);
	/*	

		switch(exti/4)
		{
		case 1:
		EXTI->EXTICR2 &= (~(0xff << (exti%4)*8));
		EXTI->EXTICR2 |= (0x5 << (exti%4)*8);
		break;
		case 2:
		EXTI->EXTICR3 &= (~(0xff << (exti%4)*8));
		EXTI->EXTICR3 |= (0x5 << (exti%4)*8);
		break;
		case 3:
		EXTI->EXTICR4 &= (~(0xff << (exti%4)*8));
		EXTI->EXTICR4 |= (0x5 << (exti%4)*8);
		break;
		}
		*/
	//2.设置中断通信为下降沿触发EXTI_FTSR1
	*style |= (0x1 << exti);

	//3.设置中断不屏蔽EXTI_C1IMR1
	EXTI->C1IMR1 |= (0x1 << exti);
}

//key_gic初始化
void hal_key_gic_init(unsigned int extid)
{

	//       GICD章节初始化
	//1.设置GICD层组控制器使能
	GICD->CTRL |= 0x1;

	//2.设置GICD层中断设置使能寄存器
	GICD->ISENABLER[extid/32] |= (0x1 << extid%32);

	//3.设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[extid/4] &= (~(0x1f << ((extid%4)*8+3)));

	//4.设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[extid/4] &= (~(0x3 << (extid%4)*8));
	GICD->ITARGETSR[extid/4] |= (0x1 << (extid%4)*8);

	//       GICC章节初始化
	//1.设置GICC层控制使能寄存器
	GICC->CTRL |= (0x1 << 0);

	//2.设置GICC层中断优先级寄存器
	GICC->PMR |= (0x1f << 3);

}




/********LED*章节*********/
//LED_GPIO初始化
void hal_led_gpio_init(gpio_t* gpiox,unsigned int pin,gpio_init_t* init)
{
	// moder; 	//引脚模式
	gpiox->MODER &= (~(0x3  << pin*2));
	gpiox->MODER |= (init->moder << pin*2);

	// otyper; 	//输出类型
	gpiox->OTYPER &= (~(0x1 << pin));
	gpiox->OTYPER |= (init->otyper << pin);


	// ospeedr; //输出速度
	gpiox->OSPEEDR &= (~(0x3 << pin));
	gpiox->OSPEEDR |= (init->ospeedr << pin*2 );


	// pupdr; 	//是否上下拉
	gpiox->PUPDR &= (~(0x3 << pin*2));
	gpiox->PUPDR |= (init->pupdr << pin*2);

}

//LED_操作
void operate_led(gpio_t* gpiox,unsigned int pin)
{
	if((gpiox->ODR & (0x1 << pin)) == 0)
	{
		turn_on(gpiox,pin);
	}
	else
	{
		turn_off(gpiox,pin);
	}
}

//LED_ON
void turn_on(gpio_t* gpiox,unsigned int pin)
{
	gpiox->ODR |= (0x1 << pin);
}

//LED_OFF
void turn_off(gpio_t* gpiox,unsigned int pin)
{
	gpiox->ODR &= (~(0x1 << pin));
}

do_irq.c

#include "key.h"

extern void printf(const char *fmt, ...);
void do_irq(void) 
{
	unsigned int num;
	//获取中断号 IAR[9:0]
	num = GICC->IAR & (0x3ff);

	//判断中断号
	//99--->KEY1
	//98--->KEY3
	//97--->KEY2

	switch(num)
	{
	case 97:
		printf("key2 pressed!!!!!!\n");
		//LED2
		operate_led(GPIOF,10);
		//1.消除EXTI层中断挂起标志位 FPR1 [9] = 1
		EXTI->FPR1 |= (0x1 << 7);
		//2.消除GICD层中断挂起标志位 ICPENDR[3] |= (0x1 << 3) 
		GICD->ICPENDR[num/32] |= (0x1 << (num%32));
		break;
	case 98:
		printf("key3 pressed!!!!!!\n");
		//LED1
		operate_led(GPIOE,10);
		//1.消除EXTI层中断挂起标志位 FPR1 [9] = 1
		EXTI->FPR1 |= (0x1 << 8);
		//2.消除GICD层中断挂起标志位 ICPENDR[3] |= (0x1 << 3) 
		GICD->ICPENDR[num/32] |= (0x1 << (num%32));
		break;
	case 99:
		printf("key1 pressed!!!!!!\n");
		//LED3
		operate_led(GPIOE,8);
		//1.消除EXTI层中断挂起标志位 FPR1 [9] = 1
		EXTI->FPR1 |= (0x1 << 9);
		//2.消除GICD层中断挂起标志位 ICPENDR[3] |= (0x1 << 3) 
		GICD->ICPENDR[num/32] |= (0x1 << (num%32));
		break;
	}
	//3.消除GICC层挂起标志位
	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 hal_exti_init()
{
	hal_key_exti_init(EXTI_7,GPIOF,&EXTI->FTSR1);
	hal_key_exti_init(EXTI_8,GPIOF,&EXTI->FTSR1);
	hal_key_exti_init(EXTI_9,GPIOF,&EXTI->FTSR1);
}

void hal_gic_init()
{
	hal_key_gic_init(EXTI7);
	hal_key_gic_init(EXTI8);
	hal_key_gic_init(EXTI9);
}
void hal_led_init()
{
	//RCC使能
	RCC->MP_AHB4ENSETR |= (0x3 << 4);
	//设定init
	gpio_init_t init = {OUTPUT,PP,LOW,NO_PUPDR};

	//LED1 PE10
	hal_led_gpio_init(GPIOE,10,&init);
	//LED2 PF10
	hal_led_gpio_init(GPIOF,10,&init);
	//LED3 PE8
	hal_led_gpio_init(GPIOE,8,&init);
}

int main()
{
	//exti初始化
	hal_exti_init();

	//gic初始化
	hal_gic_init();

	//led初始化
	hal_led_init();

	hal_put_string("KEY TEXT READY\n");
	while(1){}
	return 0;
}

ARM day9 （按键中断控制led亮灭）,ARM,arm开发,单片机,嵌入式硬件