ARM实验之GPIO点亮LED

╰+攻爆jí腚メ 2023-06-25 02:29 1阅读 0赞

##### 【实验目的】 #####

控制发光二极管，使led2、led3、led4、led5依次闪烁

##### 【实验原理图】 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70]

#### 【实验内容】 ####

### test.c ###

#define GPX2CON (*(volatile unsigned int *)0x11000c40)
    #define GPX2DAT (*(volatile unsigned int *)0x11000C44)
    #define GPX2PUD (*(volatile unsigned int *)0x11000c48)
    
    #define GPX1CON (*(volatile unsigned int *)0x11000c20)
    #define GPX1DAT (*(volatile unsigned int *)0x11000C24)
    #define GPX1PUD (*(volatile unsigned int *)0x11000c28)
    
    #define GPF3CON (*(volatile unsigned int *)0x114001e0)
    #define GPF3DAT (*(volatile unsigned int *)0x114001e4)
    #define GPF3PUD (*(volatile unsigned int *)0x114001e8)
    /****************  引脚对应  ********************
               LED2-----GPX2_7
               LED3-----GPX1_0
               LED4-----GPF3_4
               LED5-----GPF3_5
    *************************************************/
    /****************  延时函数  *********************/
    static void delay_ms(int ms)
    {
        
        int i,j;
        while(ms--)
        {
        
         for(i=0;i<5;i++)
         {
        
          for(j=0;j<514;j++);		
         }
        }
    }
    /*********************   初始化LED  *************************/
    void init_led()
    {
        
        GPX2CON=GPX2CON & (~(0xf<<28)) | (0x1<<28);   //设置为输出模式
    	GPX1CON=GPX1CON & (~(0xf)) |(0x1);  
    	GPF3CON=GPF3CON & (~(0xf<<16)) | (0x1<<16);
    	GPF3CON=GPF3CON & (~(0xf<<20)) | (0x1<<20);
    }
    void led_two_on()
    {
        
    	GPX2DAT=GPX2DAT | (0x1<<7);
    }
    void led_three_on()
    {
        
    	GPX1DAT=GPX1DAT | (0x1);
    }
    void led_four_on()
    {
        
    	GPF3DAT=GPF3DAT | (0x1<<4);
    }
    void led_five_on()
    {
        
    	GPF3DAT=GPF3DAT | (0x1<<5);
    }
    void led_two_off()
    {
        
    
    	GPX2DAT=GPX2DAT & ~(0x1<<7);
    }
    void led_three_off()
    {
        
    	GPX1DAT=GPX1DAT & ~(0x1);
    }
    void led_four_off()
    {
        
    	GPF3DAT=GPF3DAT & ~(0x1<<4);
    }
    void led_five_off()
    {
        
    	GPF3DAT=GPF3DAT & ~(0x1<<5);
    }
    void before_test()
    {
        
    	led_two_on();
    	led_three_on();
    	led_four_on();
    	led_five_on();
    	delay_ms(1200);
    	led_two_off();
    	led_three_off();
    	led_four_off();
    	led_five_off();
    	delay_ms(500);
    }
    void step_by_step()
    {
        
    	led_five_off();
    	led_two_on();
    
    	delay_ms(800);
    
    	led_two_off();
    	led_three_on();
    
    	delay_ms(800);
    	
    	led_three_off();
    	led_four_on();
    
    	delay_ms(800);
    
    	led_four_off();
    	led_five_on();
    
    	delay_ms(800);
    }
    /*********************   主函数   ****************************/
    int main()
    {
        
        init_led();
    	before_test();
        while(1)
    	{
        
    		step_by_step();
    	}
    return 0;
    }

### map.lds ###

OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")   //指定输出文件格式
    OUTPUT_ARCH(arm)   //生成的文件支持arm系列
    ENTRY(_start)   //连接后的第一条指令所在的地址是_start 
    SECTIONS   //目标文件的摆放
    {
        
    	. = 0;   //指定链接的起始地址
    	. = ALIGN(4);   //指令的对齐
    	.text :   //代码段的开始
    	{
        
    		*(.text)   //其他目标文件自动分配位置
    	}
        . = ALIGN(4);
        .data : 
    	{
         *(.data) }
        . = ALIGN(4);   //代码的对齐
        .bss :
        {
         *(.bss) }
    }

### Makefile ###

CROSS = arm-none-linux-gnueabi-
    CC=$(CROSS)gcc
    LD=$(CROSS)ld
    OBJCOPY=$(CROSS)objcopy
    
    all:
    	$(CC) -g -c -o start.o start.s  
    	$(CC) -g -c -o test.o test.c 	
    	$(LD) start.o test.o  -Tmap.lds -o test.elf
    	$(OBJCOPY)  -O  binary -S test.elf test.bin
    	$(CROSS)objdump -D test.elf > test.dis
    
    clean:
    	rm -f *.o *.elf *.bin *.dis

### start.s ###

.global _start
    _start:
    	b main

#### 【实验现象】 ####

所有灯先亮，然后全灭，然后依次led2、led3、led4、led5依次闪烁。

video

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