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單片機源程序如下:
#include<reg52.h> //包含頭文件，一般情況不需要改動，頭文件包含特殊功能寄存器的定義
#define uchar unsigned char
#define uint unsigned int
sbit we = P2^7;
sbit du = P2^6;
sbit start=P3^0;
void delay(uint z)
{
uint x,y;
for(x = z; x > 0; x--)
for(y = 114; y > 0 ; y--);
}
uchar code leddata[]={
0x3F, //"0"
0x06, //"1"
0x5B, //"2"
0x4F, //"3"
0x66, //"4"
0x6D, //"5"
0x7D, //"6"
0x07, //"7"
0x7F, //"8"
0x40, //"-"
};
uchar KeyScan() //帶返回值的子函數(shù)
{
uchar cord_l,cord_h;//聲明列線和行線的值的儲存變量
P3 = 0x0f;//0000 1111
if( (P3 & 0x0f) != 0x0f)//判斷是否有按鍵按下
{
delay(5);//軟件消抖
if( (P3 & 0x0f) != 0x0f)//判斷是否有按鍵按下
{
cord_h = P3 & 0x0f;// 儲存行線值
P3 = cord_l | 0xf0;
cord_l = P3 & 0xf0;// 儲存列線值
while( (P3 & 0xf0) != 0xf0 );//松手檢測
return (cord_l + cord_h);//返回鍵值碼
}
}
}
void main(void)
{
bit Flag;
bit flag;
while(!Flag)//執(zhí)行一次就停止了 先檢測到的相應(yīng) 復(fù)位后有效
{
we = 1;//打開位選
P0 = 0;//八位數(shù)碼管全顯示
we = 0;//鎖存位選
du = 1;//打開段選端
P0 = leddata[9];
while(!flag)
{
if(!start){ P0 = leddata[0];flag=1;}
}
switch( KeyScan() )
{
//第一行鍵值碼
case 0xee: P1=0xFE;P0 = leddata[1];Flag=1; break;
case 0xde: P1=0xFD;P0 = leddata[2];Flag=1; break;
case 0xbe: P1=0xFB;P0 = leddata[3];Flag=1; break;
case 0x7e: P1=0xF7;P0 = leddata[4];Flag=1; break;
//第二行鍵值碼
case 0xed: P1=0xef;P0 = leddata[5];Flag=1; break;
case 0xdd: P1=0xdf;P0 = leddata[6];Flag=1;; break;
case 0xbd: P1=0xbf;P0 = leddata[7];Flag=1; break;
case 0x7d: P1=0x7f;P0 = leddata[8];Flag=1; break;
}
}
while(Flag);
}
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