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大家好今天跟 單片機(jī)愛好者分享一個(gè)用單片機(jī)的三個(gè)輸出口 控制 多個(gè)按鍵的方法，可以控制幾個(gè)按鍵也可以控制幾時(shí)個(gè)按鍵；這個(gè)根據(jù)你需要的情況而定，別的話不多說了，言歸正轉(zhuǎn)；這次用的我們普遍用的單片機(jī)A圖89c51，和TLC549AD芯片，原理就是利用如圖:
程序：
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define led P2
sbit latch=P1^0;
sbit latch1=P1^1;
sbit sda=P1^2;
sbit cs=P1^3;
sbit clk=P1^4;
uchar code dm[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar code wm[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
uchar number[4] ; //TLC 轉(zhuǎn)換數(shù)據(jù)儲(chǔ)存
uchar temp,num,i;
uint u,p;
void delay(uint t) //延時(shí)
{uint a=0;
for(;a
for(p=0;p<10;p++);
}
void display() //數(shù)碼管顯示
{
for(i=0;i<4;i++)
{
led=0xff;
delay(1);
latch=1;
latch=0;
led=wm;
delay(1);
latch1=1;
latch1=0;
delay(1);
led=dm[number[0]];
delay(1);
latch=1;
latch=0;
delay(1);
led=wm;
delay(1);
latch1=1;
latch1=0;
delay(1);
}
}
uchar TLC549() //AD轉(zhuǎn)換
{ cs=1;
cs=0;
delay(1) ;
for(i=0;i<8;i++)
{ temp<<=1;
clk=1;
delay(1);
clk=0;
if(sda==1)
temp=temp|0x01;
}
cs=1;
return temp;
}
void converter() //鍵盤編碼識(shí)別
{ num=TLC549();
//number[0]=num/100;
//number[1]=num0/10;
//number[2]=num0;
switch(num)
{
case 226 : number[0]=0;break;
case 208 : number[0]=1;break;
case 190 : number[0]=2;break;
case 170 : number[0]=3;break;
case 146 : number[0]=4;break;
case 118 : number[0]=5;break;
case 84 : number[0]=6;break;
case 46 : number[0]=7;break;
default:break;
}
}
main()
{
while(1)
{
display();
converter();
delay(5);
}
}
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