#include?
#define?uchar?unsigned?char
#define?uint?unsigned?int
uchar?bufftimesj;
unsigned?char?code?dispcode[]={0x3f0x060x5b0x4f?//0123
???????????????????????????????0x660x6d0x7d0x07?//4567
???????????????????????????????0x7f0x6f0x770x7c?//89AB
???????????????????????????????0x390x5e0x790x710x00};?//CDEFnull
unsigned?char?idata?value[8];

void?delay1ms（void）??//消抖動(dòng)
{?uchar?i;
??for（i=200;i>0;i--）;
}

void?delay5ms（void）??//延時(shí)5ms
{
??unsigned?char?ij;
??for（i=5;i>0;i--）
??for（j=248;j>0;j--）;
}

void?key_scan（void）???//鍵盤輸入掃描函數(shù)
{?uchar?hangliekey;
??P3=0xf0;
??if（（P3&0xf0）!=0xf0）???//行碼為0，列碼為1
???{?delay1ms（）;
?????if（（P3&0xf0）!=0xf0）??//有鍵按下，列碼變?yōu)?
??????{?hang=0xfe;?????//逐行掃描
????????times++;
??????????????if（times==9）
????????????????times=1;
????????while（（hang&0x10）!=0）??//掃描完4行后跳出
?????????{?P3=hang;
???????????if（（P3&0xf0）!=0xf0）??//本行有鍵按下
????????????{?lie=（P3&0xf0）|0x0f;
??????????????buff=（（~hang）+（~lie））;
??????????????switch（buff）
???????????????{?case?0x28:?key=0;break;
?????????????????case?0x14:?key=1;break;
?????????????????case?0x24:?key=2;break;
?????????????????case?0x44:?key=3;break;
?????????????????case?0x12:?key=4;break;
?????????????????case?0x22:?key=5;break;
?????????????????case?0x42:?key=6;break;
?????????????????case?0x11:?key=7;break;
?????????????????case?0x21:?key=8;break;
?????????????????case?0x41:?key=9;break;
?????????????????case?0x81:?key=10;break;
?????????????????case?0x82:?key=11;break;
?????????????????case?0x84:?key=12;break;
?????????????????case?0x88:?key=13;break;
?????????????????case?0x48:?key=14;break;
?????????????????case?0x18:?key=15;break;
???????????????}
????????????value[times-1]=key;??//按下的鍵值
????????????}
???????????else?hang=（hang<<1）|0x01;?//下一行掃描

?????????}
??????}
???}
}

void?main（void）
{?uchar?key;
??while（1）
???{?key_scan（）;
?????P0=0;
?????for（j=times;j>0;j--）?//74LS138掃描?
???????{
?????????P2=j-1;??//數(shù)碼管列掃描
?????????P0=dispcode[value[times-j]];?//A-G數(shù)據(jù)
?????????delay5ms（）;
???????}
???}
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件???????1307??2007-01-03?15:13??key_scan.Opt

?????文件????????231??2007-01-03?15:13??key_scan.plg

?????文件???????1683??2007-01-03?14:31??key_scan.Uv2

????.......??????1656??2007-01-03?12:21??key_scan_Uv2.Bak

?????文件???????2178??2007-01-03?15:12??key.c

?????文件?????101199??2007-01-03?15:20??KEY.DSN

?????文件????????717??2007-01-03?15:20??KEY.PWI

?????文件????????698??2006-12-12?20:14??key_scan.h

?????文件?????101199??2007-01-03?15:04??Last?Loaded?KEY.DBK

?????文件???????4203??2007-01-03?15:13??key.LST

?????文件?????????28??2007-01-03?15:13??key_scan.lnp

?????文件???????8224??2007-01-03?15:13??key_scan.M51

?????文件???????1117??2007-01-03?15:13??key_scan.hex

????.......??????1309??2007-01-03?15:05??key_scan_Opt.Bak

?????文件???????4871??2007-01-03?15:13??key.OBJ

?????文件???????4056??2007-01-03?15:13??key_scan

-----------?---------??----------?-----??----

???????????????234676????????????????????16