9.13 用C语言实现LED1/LED2/LED3灯点亮

用C语言实现LED1/LED2/LED3灯点亮

实验现象

实验代码

gpio.h

#ifndef __GPIO_H__                                               
#define __GPIO_H__                                               
#define RCC_AHB4_ENSETR  (*(volatile unsigned int*)0x50000A28)   
                                                                 
typedef struct                                                   
{                                                                
    volatile unsigned int MODE;     //00                         
    volatile unsigned int OTYPER;   //04                         
    volatile unsigned int OSPEEDR;  //08                         
    volatile unsigned int PURDR;    //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.RCC使能
	RCC_AHB4_ENSETR |= (0x1 << 4);
	//1.PE10引脚设为输出模式
	GPIOE->MODE &= (~(0x3<<20));
	GPIOE->MODE |= (0x1<<20);
	//2.设置PE10引脚为推挽输出模式
	GPIOE->OTYPER &= (~(0x1<<10));
	//3.设置PE10引脚为低速输出模式
	GPIOE->OSPEEDR &= (~(0x3)<<20);
	//4.设置PE10引脚为禁止上下拉
	GPIOE->PURDR &= (~(0x3 << 20));
}
void LED1_on()
{
	GPIOE->ODR |= (0x1<<10);
}
void LED1_off()
{
	GPIOE->ODR &= (~(0x1<<10));
}
void LED2_init()
{
	RCC_AHB4_ENSETR |= (0x1 << 5);
	//1.PF10引脚设为输出模式
	GPIOF->MODE &= (~(0x3<<20));    
	GPIOF->MODE |= (0x1<<20);       
	//2.设置PF10引脚为推挽输出模式  
	GPIOF->OTYPER &= (~(0x1<<10));  
	//3.设置PF10引脚为低速输出模式  
	GPIOF->OSPEEDR &= (~(0x3)<<20); 
	//4.设置PF10引脚为禁止上下拉    
	GPIOF->PURDR &= (~(0x3 << 20)); 

}
void LED2_on()
{
	GPIOF->ODR |= (0x1<<10);
}
void LED2_off()
{
	GPIOF->ODR &= (~(0x1<<10));
}
void LED3_init()
{
	//0.RCC使能
	RCC_AHB4_ENSETR |= (0x1 << 4);
	//1.PE10引脚设为输出模式
	GPIOE->MODE &= (~(0x3<<16));
	GPIOE->MODE |= (0x1<<16);
	//2.设置PE10引脚为推挽输出模式
	GPIOE->OTYPER &= (~(0x1<<8));
	//3.设置PE10引脚为低速输出模式
	GPIOE->OSPEEDR &= (~(0x3)<<16);
	//4.设置PE10引脚为禁止上下拉
	GPIOE->PURDR &= (~(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();
        delay_ms(500);
        LED1_off();
        delay_ms(500);
        LED2_on();
        delay_ms(500);
        LED2_off();
        delay_ms(500);
        LED3_on();
        delay_ms(500);
        LED3_off();                           
        delay_ms(500);
    }
    return 0;
}