keycheck.c

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#include <reg52.h>
#define unchar unsigned char 
unchar keystu=0xff;
unchar sweep[]={0xef,0xdf,0xbf,0x7f};
unchar seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
bit t1s=0;
bit t10ms=0;

/********************T1初始化，10ms中断一次，16位重装方式****************************/
void initt1()
{
TMOD=0x1f;
TR1=1;
TL1=0x54;
TH1=0xd9;
ET1=1;
EA=1;
}

/****************键盘检测是否按下***********************/
unchar keyin()
{
unchar k_1;
k_1=(~P1)&0x0f;
if(k_1!=0)
keystu=keystu<<1;
return(keystu);
}

/****************键盘扫描哪个键按下**********************/
unchar keyscan()
{
unchar i,l,r,num;	//l记录行数，r记录列数，num记录哪个键
for(i=0;i<4;i++)
{
P1=sweep[i];
num=(~P1)&0x0f;
if(num!=0)
{
r=i;   //记录当前列数
switch(num)
{
case 0x01:l=0;break;
case 0x02:l=1;break;
case 0x04:l=2;break;
case 0x08:l=3;break;
default:break;
num=4*r+l;}
return(num);
}}}

/***************中断入口***************/
void timer1() interrupt 3
{
unchar t;
TL1=0xd9;
TH1=0x54;
TF1=0;
t10ms=1;
t++;
if(t==100)
{
t=0;
t1s=1;
}
}

/**************主函数***********************/
void main()
{
unchar k,keynum;
P1=0x0f;
initt1();
while(1)
{if(t1s)
{
t1s=0;
P2=~P2;
}
if(t10ms)
{
t10ms=0;
k=keyin();
if(k<=0xfa||k==0xfc)
{
keystu=0xff;
keynum=keyscan();
switch(keynum)
{
case 0:P0=seg[0] ;break;
case 1:P0=seg[1] ;break;
case 2:P0=seg[2] ;break;
case 3:P0=seg[3] ;break;
case 4:P0=seg[4] ;break;
case 5:P0=seg[5] ;break;
case 6:P0=seg[6] ;break;
case 7:P0=seg[7] ;break;
case 8:P0=seg[8] ;break;
case 9:P0=seg[9] ;break;
case 10:P0=seg[10] ;break;
case 11:P0=seg[11];break;
case 12:P0=seg[12] ;break;
case 13:P0=seg[13] ;break;
case 14:P0=seg[14] ;break;
case 15:P0=seg[15] ;break;
default:break;}}}}}