include/led.h
#ifndef __LED_H__
#define __LED_H__
//声明一个结构体
typedef struct{
unsigned int MODERl;
unsigned int OTYPER;
unsigned int OSPEEDR;
unsigned int PUPDR;
unsigned int IDR;
unsigned int ODR;
}gpio_t;
#define GPIOE ((volatile gpio_t*)0x50006000)
#define GPIOF ((volatile gpio_t*)0x50007000)
#define RCC_MP_AHB4ENSETR (*(volatile int*)0x50000A28)
//封装函数
void my_InitLed(volatile gpio_t* GPIOX,int b);
void my_OnLed(volatile gpio_t* GPIOX,int b);
void my_OffLed(volatile gpio_t* GPIOX,int b);
#endif
src/led.c
#include "led.h"
void my_InitLed(volatile gpio_t* GPIOX,int b)
{
GPIOX->MODERl &= (~(0x3 << (2*b)));
GPIOX->MODERl |= (0x1 << (2*b));
GPIOX->OTYPER &= (~(0x1 << b));
GPIOE->OSPEEDR &= (~(0x3 << (2*b)));
GPIOE->PUPDR &= (~(0x3 << (2*b)));
}
void my_OnLed(volatile gpio_t* GPIOX,int b)
{
GPIOE->ODR &= (~(0x1 << b));
}
void my_OffLed(volatile gpio_t* GPIOX,int b)
{
GPIOE->ODR &= (~(0x1 << b));
}
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()
{
RCC_MP_AHB4ENSETR |= (0x1 << 4);
RCC_MP_AHB4ENSETR |= (0x1 << 5);
my_InitLed(GPIOE,10);
my_InitLed(GPIOF,10);
my_InitLed(GPIOE,8);
while(1)
{
my_OnLed(GPIOE,10);
delay_ms(1000);
my_OffLed(GPIOE,10);
delay_ms(1000);
my_OnLed(GPIOF,10);
delay_ms(1000);
my_OffLed(GPIOF,10);
delay_ms(1000);
my_OnLed(GPIOE,8);
delay_ms(1000);
my_OffLed(GPIOE,8);
delay_ms(1000);
}
return 0;
}