单个数码管显示4x4矩阵按键

代码：

#include

#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;

DelayMS(1);

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;

}

P1 = 0xf0;

DelayMS(1);

Tmp = P1 >> 4 ^ 0x0f;

switch(Tmp)

{

case 1: KeyNO += 0; break;

case 2: KeyNO += 4; break;

case 4: KeyNO += 8; break;

case 8: KeyNO += 12;

}

}

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);

}

}

硬件连接：