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#include <AT89X52.H>
#include<stdio.h>
unsigned char code table[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};//共陽數碼管顯示0~F
void delay() //延時子程序
{
unsigned char n, m;
for (n = 100; n > 0; n--)
for (m = 300; m > 0; m--);
}
void display(unsigned char S) //顯示子程序
{
P0 = table[S]; //數碼管是P0口驅動的
delay();
P2 = 0x7f; //數碼管選通開關（P2.7選通 也就是數碼管的第八位 (從左到右順序)）
}
unsigned char Keycan(void) //按鍵掃描程序 P1.0--P1.3為行線 P1.4--P1.7為列線
{
unsigned char rcode, ccode;
P1 = 0xF0; // 發全0行掃描碼，列線輸入
if((P1&0xF0) != 0xF0) // 若有鍵按下
{
delay();// 延時去抖動
if((P1&0xF0) != 0xF0)
{ rcode = 0xFE; // 逐行掃描初值
while((rcode&0x10) != 0)
{
P1 = rcode; // 輸出行掃描碼
if((P1&0xF0) != 0xF0) // 本行有鍵按下
{
ccode = (P1&0xF0)|0x0F;
do{;}while((P1&0xF0) != 0xF0); //等待鍵釋放
return ((~rcode) + (~ccode)); // 返回鍵編碼
}
else
rcode = (rcode<<1)|0x01; // 行掃描碼左移一位
}
}
}
return 0; // 無鍵按下，返回值為0
}
void KeyDispaly(unsigned char key)
{
switch(key)
{
case 0x11: display(0); break;
case 0x21: display(1); break;
case 0x41: display(2); break;
case 0x81: display(3); break;
case 0x12: display(4); break;
case 0x22: display(5); break;
case 0x42: display(6); break;
case 0x82: display(7); break;
case 0x14: display(8); break;
case 0x24: display(9); break;
case 0x44: display(10); break;
case 0x84: display(11); break;
case 0x18: display(12); break;
case 0x28: display(13); break;
case 0x48: display(14); break;
case 0x88: display(15); break;
default: break;
}
}
int main(void)
{
unsigned char Key;
while(1)
{
Key = Keycan();
KeyDispaly(Key);
}
return 0;
}
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