小灯部分总分析
点亮小灯硬件分析
该节内容以LED2为例
分析LED部分：
欲点亮LED2，则LED2需导通状态
Q16导通，DB0低电平时，此时LED2有压降，则LED2可导通
分析74HC245芯片：
72HC245
19号OE号脚，为使能引脚，该引脚接地，所以是低电平，该引脚低电平有效，故74HC245芯片可作用
1号脚是方向引脚，接VCC，故是高电平，所以是A编号引脚控制B编号引脚
A1号脚低电平则B1号脚低电平，即DB_0低电平则DB0低电平 ^DBX-0
分析74HC138芯片：
74HC138
4号脚E1为低电平有效，5号脚E2低电平有效，E3高电平有效
欲达到上述效果，则
ENLED低电平，此时E1和E2均为低电平
ADDR3高电平，此时E3高电平
此时，该芯片可正常使用
欲使Q16导通，则LEDS6需要为低电平，此时Q16才有压降，才可以导通
欲使LEDS6低电平，查真值表后，需要3号脚A2为高电平，2号脚A1为高电平，1号脚A0为低电平
欲达到以上效果，则
ADDR0为低电平，则A0为低电平
ADDR1为高电平，则A1为高电平
ADDR2为高电平，则A2为高电平 ^Q16-1
分析跳线部分：
欲时ADDR0低电平，则P1.0需要低电平
欲使ADDR1高电平，则P1.1需要高电平
欲使ADDR2高电平，则P1.2需要高电平
欲使ADDR3高电平，则P1.3需要高电平
欲使DB_0低电平，则P0.0需要低电平
欲使ENLED低电平，则P1.4需要低电平
综上：
欲电亮小灯，
P0.0低电平，等效于DB_0低电平
P1.0低电平，等效于ADDR0低电平
P1.1高电平，等效于ADDR1高电平
P1.2高电平，等效于ADDR2高电平
P1.3高电平，等效于ADDR3高电平
P1.4低电平，等效于ENLED低电平
代码
点亮 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;//三极管导通
LED = 0;//灯亮
while (1);
}点亮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;//三极管导通
LED = 0;//灯亮
while (1);
}点亮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;//三极管导通
LED = 0;//灯亮
while (1);
}点亮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;//三极管导通
LED = 0;//灯亮
while (1);
}点亮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;//三极管导通
LED = 0;//灯亮
while (1);
}点亮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;//三极管导通
LED = 0;//灯亮
while (1);
}点亮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;//三极管导通
LED = 0;//灯亮
while (1);
}点亮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;//三极管导通
LED = 0;//灯亮
while (1);
}小灯闪烁
LED2闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}LED3闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}LED4闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}LED5闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}LED6闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}LED7闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}LED8闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}LED9闪烁
#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;//三极管导通
while (1)
{
LED = 0;//灯亮
for (i = 0; i < 30000; ++i);//非精确延时
LED = 1;//灯灭
for (i = 0; i < 30000; ++i);//非精确延时
}
}流水灯
右向左
#include 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;//三极管导通 while (1) { if (8 == cnt)//到最左边，需要进行复位，点亮最右边 cnt = 0; P0 = ~(1
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