#include <REGX51.H>
sbit weiA=P2^0;
sbit duanB=P2^1;
sbit beep=P2^7;
unsigned char wei[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char duan[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,
0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,0x00};
void delay_ms(unsigned int ms)
{
unsigned char i;
while(ms--)
for(i=0;i<123;i++);
}
unsigned char key_scan()
{
unsigned char key_no=16;
P1=0xf0;
if((P1&0xf0)!=0xf0)
{
switch(P1)
{
case 0xe0: key_no=0; break;
case 0xd0: key_no=1; break;
case 0xb0: key_no=2; break;
case 0x70: key_no=3; break;
}
}
P1=0x0f;
if((P1&0x0f)!=0x0f)
{
switch(P1)
{
case 0x0e: key_no=key_no+0; break;
case 0x0d: key_no=key_no+4; break;
case 0x0b: key_no=key_no+8; break;
case 0x07: key_no=key_no+12; break;
}
}
return key_no;
}
void main()
{
unsigned char key_no,i;
while(1)
{
key_no=key_scan();
for(i=0;i<8;i++)
{
P0=wei[i];
weiA=1;
weiA=0;
P0=duan[key_no];
duanB=1;
duanB=0;
delay_ms(100);
if(key_no!=16)
{
beep=!beep;
}
}
}
}
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