一种基于atc52单片机的33独立式扫描键盘程序.c

一种基于ATC52单片机的3*3独立式扫描键盘程序

#include<REG51.H>
#define uchar unsigned char 
#define uint  unsigned int
//**********************************************************//
uchar code SEG7[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar code ACT8[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x71};
uchar code skey[16]={10,11,12,13,3,6,9,14,2,5,8,0,1,4,7,15};
uchar code act[4]={0xfe,0xfd,0xfb,0xf7};
/****************************************************************/
void delay(uint k)
{
  uint i,j;
 for(i=0;i<k;i++)
{ for(j=0;j<121;j++)
  {;}
}
}
/****************************************/
char scan_key(void)
{
 uchar i,j,in,ini,inj;
bit find=0;
for(i=0;i<4;i++)
{
 P1=act[i];
 delay(10);
in=P1;
in=in>>4;
in=in|0xf0;
for(j=0;j<4;j++)
{
 if(act[j]==in)
{find=1;
inj=j;
ini=i;
}
}
}
if(find==0)return -1;
return(ini*4+inj);
}
/***************************************/
void main(void)
{
char c;
uchar key_value;
while(1)
{
c=scan_key();
if(c!=-1)key_value=skey[c];
P0=SEG7[key_value];
P2=ACT8[0];
delay(2);
}
}
/*******************************************/