[DemoCode下载] 单片机PS/2协议的应用——PS/2的键盘程序

#include"reg52.h"

#define uchar unsigned char

#define uint unsigned int

sbit psda=P3^0;

uchar keyvalue;

uint keynum;

uchar BIT;

uchar temp;

uint j=0;

uchar  table1[3];

sbit lcden=P2^6;

sbit lcdrs=P2^4;

sbit lcdrw=P2^5;

sbit dula=P3^7;

uchar num;

uchar code table2[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,'`',        //0-15

      0,0,0,0,0,'Q','1',0,0,0,'Z','S','A','W','2',0,        //16-31

      0,'C','X','D','E','4','3',0,0,0x20,'V','F','T','R','5',0,      //32-47

      0,'N','B','H','G','Y','6',0,0,0,'M','J','U','7','8',0, //48-63

      0,',','K','I','O','0','9',0,0,'.','/','L',';','P','-',0,//64-79

      0,0,0,0,'[','=',0,0,0,0,0,']',0,'|',0,0,               //80-95

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,                //96-111

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,         //112-127

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,              //128-143

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,           //144-159

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,          //160-175

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,         //176-191

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,       //192-207

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,          //208-223

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,        //224-239

      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0          //240-255

     };

void delay(uint z)

{

uint x,y;

for(x=z;x>0;x--)

  for(y=11;y>0;y--);

}

void write_com(uchar com)

{

lcdrs=0;

P0=com;

delay(5);

lcden=1;

delay(10);

lcden=0;

delay(10);



}

void write_data(uchar _data)

{

lcdrs=1;

P0=_data;

delay(5);

lcden=1;

delay(10);

lcden=0;

delay(10);

}

void _init_()

{

IT0=1;//外部中断下降沿触发

EX0=1;//开外部0中断

EA=1;//开总中断

dula=1;

lcdrw=0;

write_com(0x01);

write_com(0x38);//指令（001 DL N F 00）表示：DL=1,8数据位；N=1，位移宽度为2倍；F=1，5*10；F=0,5*7；

write_com(0x0f);//指令（00001DCB）表示：D=1,开显示；C=1，显示光标；B=1，光标闪烁

write_com(0x06);//指令（000001[I/D]S）表示：N=1，地址加一；[I/D]=0，地址减一；S=1，开整屏移动

write_com(0x80);//第一行：0x80+(字符序号【0--f】)；第二行：0xc0+（字符序号【0--f】）



}

void main()

{

_init_();

while(1)

{

  if(keynum==3)

  {

   keynum=0;

   temp=table1[0];

   if((j%32>0)&&(j%16==0))

   {

    write_com(0xc0);

   }

   if((j%32==0)&&(j%16==0))

   {write_com(0x80);}

   write_data(table2[temp]);

   j++;

  }

  



}

}

void int0 () interrupt 0

{

if((BIT>0)&&(BIT<9))

{

  keyvalue=keyvalue>>1;

  if(psda)

   keyvalue=keyvalue|0x80;

}

BIT++;

if(BIT>10)

{

  BIT=0;

  table1[keynum]=keyvalue;

  keynum++;



}



}