使用C汇编完成点灯

在汇编语言中0x50000A28是一个地址，在c语言中需要通过指针来实现地址的访问，并通过*来访问地址中的值，用结构体对GPIO控制器进行封装 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;

之后再将#define GPIOE ((gpio_t*)0x50006000)即刻通过GPIOE对各个寄存器进行访问更改

实现结果：

 

 

如图所示完成不同led循环点亮

代码示例：

gpio.c

#include "gpio.h"
extern void printf(const char *fmt, ...);
void led1_init()
{
	//时钟使能
	rcc_ahb4_ensetr |= (0x1 << 4);
	//将[21]端口置0
	GPIOE->MODER &= (~(0x1 <<21));
	//将[20]端口置1  设置为输出模式
	GPIOE->MODER |= (0x1 <<20);
	//设置为推挽模式
	GPIOE->OTYPER &= (~(0x1 << 10));
	
	//设置低速模式
	GPIOE->OSPEEDR &=(~(0x3<<20));

	//将[21:20]置0 禁止上下拉
	GPIOE->PUPDR &= (~(0x3 <<20 ));


}

void led1_on()
{
	GPIOE->ODR |= (0x1<<10);

}


void led1_off()
{
	GPIOE->ODR &= (~(0x1<<10));

}


void led2_init()
{
	//时钟使能
	rcc_ahb4_ensetr |= (0x1 << 5);
	//将[21]端口置0
	GPIOF->MODER &= (~(0x1 <<21));
	//将[20]端口置1  设置为输出模式
	GPIOF->MODER |= (0x1 <<20);
	//设置为推挽模式
	GPIOF->OTYPER &= (~(0x1 << 10));
	
	//设置低速模式
	GPIOF->OSPEEDR &=(~(0x3<<20));

	//将[21:20]置0 禁止上下拉
	GPIOF->PUPDR &= (~(0x3 <<20 ));


}

void led2_on()
{
	GPIOF->ODR |= (0x1<<10);

}


void led2_off()
{
	GPIOF->ODR &= (~(0x1<<10));

}





void led3_init()
{
	//时钟使能
	rcc_ahb4_ensetr |= (0x1 << 4);
	//将[17]端口置0
	GPIOE->MODER &= (~(0x1 <<17));
	//将[16]端口置1  设置为输出模式
	GPIOE->MODER |= (0x1 <<16);
	//设置为推挽模式
	GPIOE->OTYPER &= (~(0x1 << 8));
	
	//设置低速模式
	GPIOE->OSPEEDR &=(~(0x3<<16));

	//将[17:16]置0 禁止上下拉
	GPIOE->PUPDR &= (~(0x3 <<16 ));


}

void led3_on()
{
	GPIOE->ODR |= (0x1<<8);

}


void led3_off()
{
	GPIOE->ODR &= (~(0x1<<8));

}

gpio.h

#ifndef __GPIO_H__
#define __GPIO_H__

//封装RCC寄存器
#define rcc_ahb4_ensetr (*(volatile unsigned int *)0x50000A28)

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)

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

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();

	led2_init();

	led3_init();

	while(1)

	{

		led1_on();

		delay_ms(1000);

		led1_off();

		led2_on();

		delay_ms(1000);

		led2_off();

		led3_on();

		delay_ms(1000);

		led3_off();

	}











	return 0;

}