原程序
#include<reg51.h>
unsigned char dip[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
sbit KEY9=P3^1;
sbit KEY10=P3^2;
sbit BUZZ=P3^0;
bit start_key();
bit end_key();
unsigned int number_key();
void delay_20ms();
void buzz_on();
void main()
{
unsigned char key_number,n;
while(1)
{
P0=0x00;
BUZZ=1;
if(start_key()==1)
{
key_number=number_key();
if(key_number==0)continue;
else P0=dip[key_number];
while(end_key()==1)
buzz_on();
}
else{P0=0x49;
while(end_key()==1)
{
key_number=number_key();
if(key_number!=0)
{
P0=dip[key_number];
for(n=0;n<150;n++)
buzz_on();
while(end_key()==1);
break;
}
}
}
}
}
bit start_key()
{ if(KEY9==1)
return 1;
else
return 0;
}
bit end_key()
{ if(KEY10==1)
return 1;
else
delay_20ms();
if(KEY10==1)
return 1;
else
return 0;
}
unsigned int number_key()
{unsigned char key_state=0;
key_state=P1;
if(key_state==0xFF)
return 0;
else
{
if(key_state==0xfe)return 1;
else if(key_state==0xFD)return 2;
else if(key_state==0xFB)return 3;
else if(key_state==0xF7)return 4;
else if(key_state==0xEF)return 5;
else if(key_state==0xDF)return 6;
else if(key_state==0xBF)return 7;
else return 8;
}
}
void buzz_on()
{unsigned char i;
BUZZ=0;
for(i=0;i<26;i++)
delay_20ms();
BUZZ=1;
}
void delay_20ms()
{
unsigned int j;
for(j=0;j<10;j++);
}
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