PS2键盘键值解码程序

51单片机第二十课PS2键盘键值解码

所属类别:课程代码发布日期:2011-03-05 点击量:270 #include

#define uchar unsigned char

#define uint unsigned int

sbit psdata=P3^0;

sbit psclk=P3^2;

uchar numbit;

uchar keyv;

uchar key[3];

uchar keynum;

uchar m,n;

unsigned char code smg_du[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e, 0x79,0x71,0x00};

unsigned char code smg_we[]={0x08,0x18,0x28,0x38,0x48,0x58,0x68,0x78};

//************************************************

//延时函数，在12MHz的晶振频率下

//大约50us的延时

//************************************************

void delay_50us(uint t)

{

uchar j;

for(;t>0;t--)

for(j=19;j>0;j--);

}

//************************************************

//延时函数，在12MHz的晶振频率下

//大约50ms的延时

//************************************************

void delay_50ms(uint t)

uint j;

for(;t>0;t--)

for(j=6245;j>0;j--);

}

void main()

{

IT0=1; //外部中断下降沿触发

EX0=1; //打开外部中断0

EA=1; //打开总中断

while(1)

{

if(keynum==3)

{

keynum=0; //0x1c

n=key[0]/16;

m=key[0]%16;

}

P1=smg_du[m];

P2=smg_we[0];

delay_50us(20);

P1=smg_du[n];

P2=smg_we[1];

delay_50us(20);

}

}

void int0 () interrupt 0

{

if((numbit>0)&&(numbit<9)) //>>

{

keyv=keyv>>1; //001000000 if(psdata)

keyv=keyv | 0x80; //10000000

} //01

numbit++; //0

if(numbit>10)

numbit=0;

key[keynum]=keyv; keynum++;

}

}