嵌入式学习-gpio流水灯

嵌入式学习—流水灯c语言

• gpio.h
• gpio.c
• main.c

c语言点灯

gpio.h

#ifndef __GPIO_H__
#define __GPIO_H__

//1.RCC定义寄存器封装
#define RCC_AHB4_ENSETR *((volatile unsigned int*)0x50000A28)

//2.GPIO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 GPIOE ((gpio_t*)0x50006000)
#define GPIOF ((gpio_t*)0x50007000)


//3.LED灯初始化
void LED_init();
//4.LED灯亮
void LED_on();
//5.LED灯灭
void LED_off();

#endif

gpio.c

#include
void LED_init(gpio_t* gpiox, int pin )//输入gpio组,并初始化配置
{
    gpiox->MODER&=(~(0x3<<(pin*2)));
    gpiox->MODER|=(0x1<<(pin*2));
    gpiox->OTYPER&=(~(0x1<<pin));
    gpiox->OSPEEDR&=(~(0x3<<(pin*2)));
    gpiox->PUPDR&=(~(0X3<<pin*2));

}

void LED_on(gpio_t* gpiox,int pin)//组+pin选择点亮                
{
    gpiox->ODR|=(0x1<<pin);

}

void LED_off(gpio_t* gpiox,int pin ) 
{
    gpiox->ODR&=(~(0x1<<pin));

}

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()                                  
{                                           
    RCC_AHB4_ENSETR|=(0x3<<4);//使能E,F时钟 
    gpio_t* led1,*led2,*led3;//             
    led1=led3=GPIOE;                        
    led2=GPIOF;                             
                                            
    int pin1=10;                            
    int pin2=8;                             
    LED_init(led1,pin1);                    
    LED_init(led2,pin1);                    
    LED_init(led3,pin2);                    
                                            
    //初始化(配置)gpio                      
    while(1)                                
    {                                       
        LED_on(led1,pin1);                  
        delay_ms(500);                      
        LED_off(led1,pin1);                 
        delay_ms(500);                      
        LED_on(led2,pin1);                  
        delay_ms(500);                      
        LED_off(led2,pin1);                 
        delay_ms(500);                      
        LED_on(led3,pin2);                  
        delay_ms(500);                      
        LED_off(led3,pin2);                 
        delay_ms(500);                      
    }                                       
    return 0;                               
}