單片機(jī)PS/2協(xié)議的應(yīng)用——PS/2的鍵盤程序

ID:71259 · 發(fā)表于 2014-12-30 23:40

/*

   PS/2協(xié)議的應(yīng)用：（常見的有PS/2接口鼠標(biāo)、鍵盤等）用PS/2的鍵盤控制單片機(jī)，用字符型液晶顯示器1602簡單

                                    顯示鍵盤的輸入值

                                 由于at89s52單片機(jī)的工作頻率過低，不易掃描更多鍵值

*/

#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;//外部中斷下降沿觸發(fā)
EX0=1;//開外部0中斷
EA=1;//開總中斷
dula=1;
lcdrw=0;
write_com(0x01);
write_com(0x38);//指令（001 DL N F 00）表示：DL=1,8數(shù)據(jù)位；N=1，位移寬度為2倍；F=1，5*10；F=0,5*7；
write_com(0x0f);//指令（00001DCB）表示：D=1,開顯示；C=1，顯示光標(biāo)；B=1，光標(biāo)閃爍
write_com(0x06);//指令（000001[I/D]S）表示：N=1，地址加一；[I/D]=0，地址減一；S=1，開整屏移動(dòng)
write_com(0x80);//第一行：0x80+(字符序號(hào)【0--f】)；第二行：0xc0+（字符序號(hào)【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++;
}
}

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單片機(jī)PS/2協(xié)議的應(yīng)用——PS/2的鍵盤程序

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