LED灯控制：从汇编到C语言实现及GPIO接口封装-优快云博客

本文链接：https://blog.youkuaiyun.com/xiaocaiji0/article/details/129094106

本文展示了如何使用汇编语言和C语言分别实现对LED1/LED2/LED3的点亮操作，同时讨论了如何封装初始化函数和GPIO接口函数。代码示例中包括了对STM32的GPIO寄存器配置以及延时函数的实现。

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题目：

1.用汇编语言实现LED1/LED2/LED3三盏灯点亮

2.用C语言实现LED1/LED2/LED3三盏灯点亮

3.思考：如何封装初始化函数，如何封装操作GPIO接口函数，枚举关键字/特点

代码：

代码一：

asm_led.S


.text 
.global _start
_start: 
    /**********LED1点灯----->PE10**************/


    /**********RCC**************/

@GPIO 时钟使能 RCC_AHB4ENSETR寄存器设置 0x50000a28[4]=1;
    ldr r0,=0x50000A28     @使能GPIOE时钟
    ldr r1,[r0]
    orr r1,r1,#(0x1<<4)
    str r1,[r0]

    ldr r0,=0x50000A28     @使能GPIOF时钟
    ldr r1,[r0]
    orr r1,r1,#(0x1<<5)        
    str r1,[r0]

    /**********GPIO**************/
/*led1*/
    ldr r0,=0x50006000     @moder
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<20))
    orr r1,r1,#(0x1<<20)
    str r1,[r0]
    
    ldr r0,=0x50006004     @otyper
    ldr r1,[r0]
    and r1,r1,#(~(0x1<<10))
    str r1,[r0]
    
    ldr r0,=0x50006008  @ospeedr
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<20))
    str r1,[r0]      

    ldr r0,=0x5000600c  @pupdr
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<20))
    str r1,[r0]

/*led2*/
    ldr r0,=0x50007000  @moder
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<20))
    orr r1,r1,#(0x1<<20)
    str r1,[r0]

    ldr r0,=0x50007004  @otyper
    ldr r1,[r0]
    and r1,r1,#(~(0x1<<10))
    str r1,[r0]

    ldr r0,=0x50007008  @ospeedr
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<20))
    str r1,[r0]

    ldr r0,=0x5000700c  @pupdr
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<20))
    str r1,[r0]

/*led3*/                               
    ldr r0,=0x50006000  @moder
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<16))
    orr r1,r1,#(0x1<<16)
    str r1,[r0]
    
    ldr r0,=0x50006004  @otyper
    ldr r1,[r0]
    and r1,r1,#(~(0x1<<8))
    str r1,[r0]
    
    ldr r0,=0x50006008  @ospeedr
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<16))
    str r1,[r0]      

    ldr r0,=0x5000600c  @pupdr
    ldr r1,[r0]
    and r1,r1,#(~(0x3<<16))
    str r1,[r0]


loop:

    bl led1_on
    bl led2_on
    bl led3_on
    bl delay_1s
    bl led1_off
    bl led2_off
    bl led3_off
    bl delay_1s
    b loop


led1_on:
    ldr r0,=0x50006014  @odr
    ldr r1,[r0]
    orr r1,r1,#(0x1<<10)
    str r1,[r0]
    mov pc,lr
led1_off:
    ldr r0,=0x50006014  @odr
    ldr r1,[r0]
    and r1,r1,#(~(0x1<<10))
    str r1,[r0]
    mov pc,lr

led2_on:
    ldr r0,=0x50007014  @odr
    ldr r1,[r0]
    orr r1,r1,#(0x1<<10)
    str r1,[r0]
    mov pc,lr
led2_off:
    ldr r0,=0x50007014  @odr
    ldr r1,[r0]
    and r1,r1,#(~(0x1<<10))
    str r1,[r0]
    mov pc,lr

led3_on:
    ldr r0,=0x50006014  @odr
    ldr r1,[r0]
    orr r1,r1,#(0x1<<8)
    str r1,[r0]
    mov pc,lr
led3_off:
    ldr r0,=0x50006014  @odr
    ldr r1,[r0]
    and r1,r1,#(~(0x1<<8))
    str r1,[r0]
    mov pc,lr


@ 大概1s的延时函数
delay_1s:
    mov r3, #0x10000000
    mm:
    cmp r3, #0
    subne r3, r3, #1
    bne mm
    mov pc, lr

.end

代码二：

led.h

#ifndef __LED_H__
#define __LED_H__
#define led1 gpioe,10
#define led2 gpiof,10
#define led3 gpioe,8

#define RCC_AHB4_ENSETR (*(volatile unsigned int*)0x50000A28)
#define GPIO_BASE(offset) ((gpio_t*)(0x50002000+offset*0x1000))
enum gpio                                                               
{
    gpioa,
    gpiob,
    gpioc,
    gpiod,
    gpioe,
    gpiof,
    gpiog,
    gpioh,
    gpioi,
    gpioj,
    gpiok,
};
typedef struct{
    volatile unsigned int MODER;   //00
    volatile unsigned int OTYPER;  //04
    volatile unsigned int OSPEEDR; //08
    volatile unsigned int PUPDR;   //0C
    volatile unsigned int IDR;     //10
    volatile unsigned int ODR;     //14
}gpio_t;

void led_init(enum gpio x,int n);
void led_on(enum gpio x,int n);
void led_off(enum gpio x,int n);


#endif

led.c

#include"led.h"

void led_init(enum gpio x,int n)
{
    RCC_AHB4_ENSETR|=(0x1<<x);
    GPIO_BASE(x)->MODER&=~(0x3<<(2*n));
    GPIO_BASE(x)->MODER|=(0x1<<(2*n));

    GPIO_BASE(x)->OTYPER&=~(0x1<<n);
    GPIO_BASE(x)->OSPEEDR&=~(0x3<<(2*n));
    GPIO_BASE(x)->PUPDR&=~(0x3<<(2*n));            
}

void led_on(enum gpio x,int n)
{
    GPIO_BASE(x)->ODR|=(0x1<<n);
}

void led_off(enum gpio x,int n)
{
    GPIO_BASE(x)->ODR&=~(0x1<<n);
}

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()
{
    led_init(led1); // LED灯初始化
    led_init(led2); // LED灯初始化
    led_init(led3); // LED灯初始化
    led_on(led2);
    led_on(led3);
    while(1)
    {
        led_on(led1);
        delay_ms(500);
        led_off(led1);
        delay_ms(500);
    }
    return 0;
}

运行结果：

结果一：