0220作业

C语言实现LED1闪烁

led.h

#ifndef __LED_H__
#define __LED_H__//RCC寄存器封装
#define RCC_MP_AHB4_ENSETR (*(volatile unsigned int*)0x50000A28) //寄存器封装//GPIO寄存器封装
typedef struct{volatile unsigned int MODER; //00volatile unsigned int OTYPER; //04volatile unsigned int OSPEEDR; //08volatile unsigned int PUPDR; //0Cvolatile unsigned int IDR; //10volatile unsigned int ODR; //14
}gpio_t;
#define GPIOE (*(gpio_t*)0x50006000) //GPIOE基地址 0x50006000
#define GPIOF (*(gpio_t*)0x50007000) //GPIOF基地址 0x50007000//LED1灯初始化
void led1_rcc_init();
//LED1灯点亮
void led1_on();
//LED1灯熄灭
void led1_off();#endif

led.c

#include "led.h"//LED1灯初始化
void led1_rcc_init()
{//设置GPIOE组时钟使能 通过RCC_MP_AHB4ENSETR寄存器设置 0x50000A28[4] = 1RCC_MP_AHB4_ENSETR |=(0x1<<4);//1.设置PE10引脚为输出模式 通过GPIOE_MODER寄存器设置 0x50006000[21:20] = 01GPIOE.MODER&=~(0x3<<20);GPIOE.MODER|=(0x1<<20);//2.设置PE10引脚为推挽输出类型 通过GPIOE_OTYPER寄存器设置 0x50006004[10] = 0GPIOE.OTYPER&=~(0x1<<10);//3.设置PE10引脚为低速输出 通过GPIOE_OSPEEDR寄存器设置 0x50006008[21:20] =00GPIOE.OSPEEDR&=~(0x3<<20);//4.设置PE10引脚为禁止上下拉电阻 通过GPIOE_PUPDR寄存器设置 0x5000600C[21:20]= 00GPIOE.PUPDR&=~(0x3<<20);}//LED1灯点亮
void led1_on()
{//1.设置PE10引脚为输出高电平 通过GPIOE_ODR寄存器设置 0x50006014[10] = 1GPIOE.ODR|=(0x1<<10);
}//LED1灯熄灭
void led1_off()
{//1.设置PE10引脚为输出低电平 通过GPIOE_ODR寄存器设置 0x50006014[10] = 0GPIOE.ODR&=~(0x1<<10);
}

main.c

#include "led.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灯初始化led1_rcc_init();while(1){//LED1灯点亮led1_on();delay_ms(500);//LED1灯熄灭led1_off();delay_ms(500);}return 0;
}