小燈部分總分析

點亮小燈

硬件分析

該節(jié)內(nèi)容以LED2為例

分析LED部分：
欲點亮LED2，則LED2需導(dǎo)通狀態(tài)
Q16導(dǎo)通，DB0低電平時，此時LED2有壓降，則LED2可導(dǎo)通

分析74HC245芯片：
72HC245
19號OE號腳，為使能引腳，該引腳接地，所以是低電平，該引腳低電平有效，故74HC245芯片可作用
1號腳是方向引腳，接VCC，故是高電平，所以是A編號引腳控制B編號引腳
A1號腳低電平則B1號腳低電平，即DB_0低電平則DB0低電平 ^DBX-0

分析74HC138芯片：
74HC138
4號腳E1為低電平有效，5號腳E2低電平有效，E3高電平有效
欲達(dá)到上述效果，則
ENLED低電平，此時E1和E2均為低電平
ADDR3高電平，此時E3高電平
此時，該芯片可正常使用

欲使Q16導(dǎo)通，則LEDS6需要為低電平，此時Q16才有壓降，才可以導(dǎo)通
欲使LEDS6低電平，查真值表后，需要3號腳A2為高電平，2號腳A1為高電平，1號腳A0為低電平
欲達(dá)到以上效果，則
ADDR0為低電平，則A0為低電平
ADDR1為高電平，則A1為高電平
ADDR2為高電平，則A2為高電平 ^Q16-1

分析跳線部分：

欲時ADDR0低電平，則P1.0需要低電平
欲使ADDR1高電平，則P1.1需要高電平
欲使ADDR2高電平，則P1.2需要高電平
欲使ADDR3高電平，則P1.3需要高電平

欲使DB_0低電平，則P0.0需要低電平
欲使ENLED低電平，則P1.4需要低電平

綜上：
欲電亮小燈，
P0.0低電平，等效于DB_0低電平
P1.0低電平，等效于ADDR0低電平
P1.1高電平，等效于ADDR1高電平
P1.2高電平，等效于ADDR2高電平
P1.3高電平，等效于ADDR3高電平
P1.4低電平，等效于ENLED低電平

代碼

倉庫

倉庫地址：https://gitee.com/EricsT/51_microcontrollers/tree/master/LED

點亮 LED2

#include<reg52.h>

sbit LED = P0 ^ 0;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

點亮LED3

#include<reg52.h>

sbit LED = P0 ^ 1;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

點亮LED4

#include<reg52.h>

sbit LED = P0 ^ 2;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

點亮LED5

#include<reg52.h>

sbit LED = P0 ^ 3;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

點亮LED6

#include<reg52.h>

sbit LED = P0 ^ 4;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

點亮LED7

#include<reg52.h>

sbit LED = P0 ^ 5;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

點亮LED8

#include<reg52.h>

sbit LED = P0 ^ 6;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

點亮LED9

#include<reg52.h>

sbit LED = P0 ^ 7;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通
    LED = 0;//燈亮
    while (1);
}

小燈閃爍

LED2閃爍

#include <reg52.h>

sbit LED   = P0 ^ 0;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

LED3閃爍

#include <reg52.h>

sbit LED   = P0 ^ 1;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

LED4閃爍

#include <reg52.h>

sbit LED   = P0 ^ 2;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

LED5閃爍

#include <reg52.h>

sbit LED   = P0 ^ 3;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

LED6閃爍

#include <reg52.h>

sbit LED   = P0 ^ 4;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

LED7閃爍

#include <reg52.h>

sbit LED   = P0 ^ 5;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

LED8閃爍

#include <reg52.h>

sbit LED   = P0 ^ 6;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

LED9閃爍

#include <reg52.h>

sbit LED   = P0 ^ 7;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        LED = 0;//燈亮
        for (i = 0; i < 30000; ++i);//非精確延時
        LED = 1;//燈滅
		for (i = 0; i < 30000; ++i);//非精確延時
    }
}

流水燈

右向左

#include <reg52.h>

sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;
	char cnt = 0;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{		  
		if (8 == cnt)//到最左邊，需要進行復(fù)位，點亮最右邊
			cnt = 0;
		P0 = ~(1 << cnt);
		cnt++;
        for (i = 0; i < 30000; ++i);//非精確延時
    }
}

左向右

#include <reg52.h>

sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;
	char cnt = 7;

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{		  
		if (-1 == cnt)//到最右邊，需要進行復(fù)位，點亮最左邊
			cnt = 7;
		P0 = ~(1 << cnt);
		cnt--;
        for (i = 0; i < 30000; ++i);//非精確延時
    }
}

由右開始循環(huán)

#include <reg52.h>

sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;
    char cnt = 0;
    char isLeft = 1;//自右向左標(biāo)志位

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        if (isLeft)
		{
            if (8 == cnt)//到最左邊，需要回到左邊起第二位，同時改變方向
			{
				cnt = 6;
				isLeft = 0;
			} 
        }
		else
		{
			if (-1 == cnt)//到最右邊，需要回到右邊起第二位，同時改變方向
			{
				cnt = 1;
				isLeft = 1;
			}
				
		}

        P0 = ~(1 << cnt);

        if (isLeft)
            cnt++;
		else
			cnt--;

        for (i = 0; i < 30000; ++i);//非精確延時
    }
}

由左開始循環(huán)

#include <reg52.h>

sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;
    char cnt = 7;
    char isLeft = 0;//自右向左標(biāo)志位

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    while (1) 
	{
        if (isLeft)
		{
            if (8 == cnt)//到最左邊，需要回到左邊起第二位，同時改變方向
			{
				cnt = 6;
				isLeft = 0;
			} 
        }
		else
		{
			if (-1 == cnt)//到最右邊，需要回到右邊起第二位，同時改變方向
			{
				cnt = 1;
				isLeft = 1;
			}
				
		}

        P0 = ~(1 << cnt);

        if (isLeft)
            cnt++;
		else
			cnt--;

        for (i = 0; i < 30000; ++i);//非精確延時
    }
}

小燈以1s頻率閃爍

#include <reg52.h>

sbit LED = P0 ^ 0;
sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

void main()
{
    unsigned int i = 0;
    unsigned char cnt = 0;//定時器超時次數(shù)

    ENLED = 0;
    ADDR3 = 1;//U3 74HC138芯片使能
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;//三極管導(dǎo)通

    TMOD = 0x01;//設(shè)置定時器T0運行模式為模式1
    
    TH0 = 0xB8;
    TL0 = 0x00;//設(shè)置定時器T0的初始值

    LED = 0;//燈亮
    TR0 = 1;//定時器T0開始工作
    
    while (1) 
	{
        if (1 == TF0)//定時器T0溢出，即過了0.02s
        {
            TF0 = 0;//定時器T0的溢出標(biāo)志復(fù)位

            TH0 = 0xB8;
            TL0 = 0x00;//設(shè)置定時器T0的初始值
            cnt++;
            if (cnt >= 50)//超出50次，即過了1s
            {//進行一次新的1s
                LED = ~LED;//燈的狀態(tài)改變
                cnt = 0;
            }               
        }
    }
}

posted @ 2025-07-23 20:08 EricsT 閱讀(289) 評論(0) 收藏舉報

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