8051????????п??????????????????
????8051????п?????0??????????????????????λ?????74LS164????????????????????????Щ???п?????????????P3???????????????????????????P3?????????8????????????????????????????8051????п???0????????????P3.4??P3.5???2*8?????????????
C51????????
#include<stdio.h> //?????
#include<reg51.h>
#include<intrins.h>
unsigned char getkey(void); //??????躯??
void proc1(void); //???尴??????????1
void proc2(void); //???尴??????????2
void proc3(void); //???尴??????????3
void proc4(void); //???尴??????????4
????
bit0=P3.4;
bit1=P3.5;
void delay(void); //???????????
void main(void) //??????
{
unsigned char idata key;
SCON=0x00; //????????
ES=0;
EA=0; //????ж?
while(1)
{
key=getkey();
if(key!=0xff)
switch (key)
{
case 0x00:
proc0();
braek;
case 0x01:
proc1();
braek;
case 0x02:
proc2();
braek;
case 0x03:
proc3();
braek;
????
????
????
default:
break;
}
}
}
unsigned char getkey(void) //??????躯??
{
unsigned char idata key_code,col=0; mask=0x00;
TI=0;
SBUF=mask;
while(TI==0);
if((bit0&bit1)!= 0)
return(0xff);
delay();
if((bit0&bit1)!= 0)
return(0xff);
mask=0xfe;
while(col!=8)
{
TI=0;
SBUF=mask;
while(TI==0);
if((bit0&bit1)!= 0)
{
mask=mask<<1;
mask=mask|0x01;
col=col+1;
continue;
}
else break;
}
if(col==8)
return(0xff);
if(bit0==1) key_code=col;
else key_code=8+col;
while(bit0&bit1==0);
return(key_code);
}
void delay(void) /*???10????*/
{
unsigned int i=10;
while(i--);
}
????admin ?????????2018-05-08
