ARM使用C语言实现点灯

 gpio.h

#ifndef __GPIO_H__
#define __GPIO_H__
#define RCC_AHB4_ENSETR (*(volatile unsigned int*)0x50000A28)

typedef struct
{
	volatile unsigned int MODER; //00
    volatile unsigned int OTYPER; //04
	volatile unsigned int OSPEEDR; //08
	volatile unsigned int PUPDR; //0c
	volatile unsigned int IDR; //10
	volatile unsigned int ODR; //14

}gpio_t;
#define GPIOE ((gpio_t*)0x50006000)
#define GPIOF ((gpio_t*)0x50007000)


void LED1_init();

void LED1_on();

void LED1_off();

void LED2_init();

void LED2_on();

void LED2_off();

void LED3_init();

void LED3_on();

void LED3_off();


#endif

gpio.c

#include"gpio.h"


void LED1_init()
{
    //0.设置GPIOE时钟使能
	RCC_AHB4_ENSETR |=(0x1 << 4);

	//1.设置PE10引脚为输出模式
	GPIOE->MODER &= (~(0x3 << 20));
    GPIOE->MODER |=(0x1 << 20);

	//2.设置PE10引脚为推挽模式
	GPIOE->OTYPER &=(~(0x1 << 10));
	
	//3.设置PE10引脚为低速模式
	GPIOE->OSPEEDR &=(~(0x3 << 20));

	
	//4.设置PE10引脚禁止上下拉
	GPIOE->PUPDR &=(~(0x3 << 20));


   
}

void LED2_init()
{
    //0.设置GPIOF时钟使能
	RCC_AHB4_ENSETR |=(0x1 << 5);

	//1.设置PF10引脚为输出模式
	GPIOF->MODER &= (~(0x3 << 20));
    GPIOF->MODER |=(0x1 << 20);

	//2.设置PF10引脚为推挽模式
	GPIOF->OTYPER &=(~(0x1 << 10));
	
	//3.设置PF10引脚为低速模式
	GPIOF->OSPEEDR &=(~(0x3 << 20));

	
	//4.设置PF10引脚禁止上下拉
	GPIOF->PUPDR &=(~(0x3 << 20));


   
}
void LED1_on()
{
   GPIOE->ODR |=(0x1 << 10);


}

void LED1_off()
{
    GPIOE->ODR &=(~(0x1 << 10));

}

void LED2_on()
{
   GPIOF->ODR |=(0x1 << 10);


}

void LED2_off()
{
    GPIOF->ODR &=(~(0x1 << 10));

}


void LED3_init()
{
    //0.设置GPIOE时钟使能
	RCC_AHB4_ENSETR |=(0x1 << 5);

	//1.设置PE10引脚为输出模式
	GPIOE->MODER &= (~(0x3 << 16));
    GPIOE->MODER |=(0x1 << 16);

	//2.设置PE10引脚为推挽模式
	GPIOE->OTYPER &=(~(0x1 << 8));
	
	//3.设置PE10引脚为低速模式
	GPIOE->OSPEEDR &=(~(0x3 << 16));

	
	//4.设置PE10引脚禁止上下拉
	GPIOE->PUPDR &=(~(0x3 << 16));
   
}



void LED3_on()
{
   GPIOE->ODR |=(0x1 << 8);


}

void LED3_off()
{
    GPIOE->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()

{



	LED1_init(); // LED灯初始化

	LED2_init();

	LED3_init();

	while(1)

	{

		LED1_on();

		LED2_on();

		LED3_on();



		delay_ms(1000);

		LED1_off();

		LED2_off();

		LED3_off();

		delay_ms(1000);

	}

	return 0;

}