ARM 作业（0913-林雪阵）

用C语言实现LED1/LED2/LED3灯点亮

 .h文件

#ifndef __GIO_H__
#define __GIO_H__

//1.RCC寄存器封装。用宏定义
#define RCC_AHB4_ENSETR (*(volatile unsigned*)0x50000A28)
//2.GIO寄存器用结构体封装
typedef struct{
	volatile unsigned int MODER;
	volatile unsigned int OTYPER;
	volatile unsigned int OSPEEDR;
	volatile unsigned int PUPDR;
	volatile unsigned int IDR;
	volatile unsigned int ODR;
}gpio_t;

#define DPIOE ((gpio_t *)0x50006000)
#define DPIOF ((gpio_t *)0x50007000)

//3.LED1灯初始化
void LED_init();
//4.LED灯点亮
void LED1_on();
void LED2_on();
void LED3_on();

//5.LED灯熄灭
void LED1_OFF();
void LED2_OFF();
void LED3_OFF();




#endif

gpio.c

#include "gpio.h"

//3.LED1灯初始化
void LED_init()
{
	//0.设置时钟使能
	RCC_AHB4_ENSETR |= (0x1 << 4);
	RCC_AHB4_ENSETR |= (0x1 << 5);

	//1.设置PE10,PE8,PF10引脚为输出模式
	DPIOE->MODER &= (~(0X3 << 20));
	DPIOE->MODER |= (0X1 << 20);

	//1.设置PF10引脚为输出模式
	DPIOF->MODER &= (~(0X3 << 20));
	DPIOF->MODER |= (0X1 << 20);

	//1.设置PE8引脚为输出模式
	DPIOE->MODER &= (~(0X3 << 16));
	DPIOE->MODER |= (0X1 << 16);



	//2.设置PE10,PF10,PE8引脚为推挽模式
	DPIOE->OTYPER &= (~(0X1 <<10));
	DPIOF->OTYPER &= (~(0X1 <<10));
	DPIOE->OTYPER &= (~(0X1 <<8));

	//3.设置PE10,PF10,PE8引脚为低速模式
	DPIOE->OSPEEDR &= (~(0X3 << 20));
	DPIOF->OSPEEDR &= (~(0X3 << 20));
	DPIOE->OSPEEDR &= (~(0X3 << 16));

	//4.设置PE10,PF10,PE8引脚禁止上下拉
	DPIOE->PUPDR &= (~(0X3 << 20));
	DPIOF->PUPDR &= (~(0X3 << 20));
	DPIOE->PUPDR &= (~(0X3 << 16));
}
//4.LED1灯点亮
void LED1_on()
{
	DPIOE->ODR |= (0x1 <<10);
}

//4.LED2灯点亮
void LED2_on()
{
	DPIOF->ODR |= (0x1 <<10);
}

//4.LED3灯点亮
void LED3_on()
{
	DPIOE->ODR |= (0x1 <<8);
}

//5.LED1灯熄灭
void LED1_OFF()
{

	DPIOE->ODR &= (~(0x1 <<10));
}


//5.LED2灯熄灭
void LED2_OFF()
{

	DPIOF->ODR &= (~(0x1 <<10));
}


//5.LED1灯熄灭
void LED3_OFF()
{

	DPIOE->ODR &= (~(0x1 <<8));
}

 main.c

#include "gpio.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()
{
	LED_init(); // LED灯初始化
	while(1)
	{
		LED1_on();
		delay_ms(1000);
		LED1_OFF();
		delay_ms(1000);
		LED2_on();
		delay_ms(1000);
		LED2_OFF();
		delay_ms(1000);
		LED3_on();
		delay_ms(1000);
		LED3_OFF();
		delay_ms(1000);


	}
	return 0;
}