#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit BEEP = P3^7;
uchar code DSY_CODE[]=
{
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0x00
};
uchar Pre_KeyNO = 16,KeyNO = 16;
void DelayMS(uint ms)
{
uchar t;
while(ms--)
{
for(t=0;t<120;t++);
}
}
void Keys_Scan()
{
uchar Tmp;
P1 = 0x0f;
P1 = 0x0f;
if(P1 != 0x0f)
{
DelayMS(1);
// Tmp = P1 ^ 0x0f;
Tmp = P1 & 0x0f;
switch(Tmp)
{
case 1: KeyNO = 0; break;
case 2: KeyNO = 1; break;
case 4: KeyNO = 2; break;
case 8: KeyNO = 3; break;
default: KeyNO = 16;break;
}
P1 = 0xf0;
DelayMS(1);
// Tmp = P1 >> 4 ^ 0x0f;
Tmp = P1 & 0xf0;
switch(Tmp)
{
case 1: KeyNO += 0; break;
case 2: KeyNO += 4; break;
case 4: KeyNO += 8; break;
case 8: KeyNO += 12;break;
}
}
}
void Beep()
{
uchar i;
for(i=0;i<100;i++)
{
DelayMS(1);
BEEP = ~BEEP;
}
BEEP = 1;
}
void main()
{
P0 = 0x00;
while(1)
{
// P1 = 0xf0;
// if(P1 != 0xf0)
Keys_Scan();
if(Pre_KeyNO != KeyNO)
{
P0 = ~DSY_CODE[KeyNO];
Beep();
Pre_KeyNO = KeyNO;
}
DelayMS(100);
}
}