/*****************************************************************/?
/*名????稱：????????K1、K2、K3、K4鍵盤???????????????????????????*/???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
/*功????能：????????讀取第一排按鍵???????????????????????????????*/????????????????????????????????????????????????????
/*??????????????????每按一個按鍵，函數返回一個鍵值???????????????*/
/*???????????????????????????????????????????????????????????????*/
/*???????????????????????????????????????????????????????????????*/
/*芯片類型：????????AT89S51??????????????????????????????????????*/????????????????????????????????????????????????????????????????
/*晶振頻率：????????11.0592MHZ???????????????????????????????????*/?
/*難度等級：????????低???????????????????????????????????????????*/?????????????????????????????????????????????????????????????????????
/*作????者：????????救火車???????????????????????????????????????*/
/*版????權：????????http://www.qm999.cn??????????????????????????*/
/*編寫日期：????????2008-11-23???????????????????????????????????*/?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
/*****************************************************************/


sbit?hang1=P3^3;???//定義矩陣鍵盤的行1
sbit?lie1=P2^0;???//定義矩陣鍵盤的列1?
sbit?lie2=P2^1;???//定義矩陣鍵盤的列2
sbit?lie3=P2^2;???//定義矩陣鍵盤的列3
sbit?lie4=P2^3;???//定義矩陣鍵盤的列4

unsigned?char?scan_key（）???//3*4矩陣鍵盤掃描函數
{
hang1=0;??????????//置第一行為低電平???
delay_ms（1）;??????//延時去抖動
if?（0==lie1）?return（1）;????//按鍵?K1被按下???，電路板上有相應標號。下同
if?（0==lie2）?return（2）;????//按鍵?K2被按下
if?（0==lie3）?return（3）;????//按鍵?K3被按下
if?（0==lie4）?return（4）;	???//按鍵?K4被按下?

hang1=1;?????????//置第一行為高電平
return?（255）;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

????.......??????2054??2008-11-23?13:23??MCP2515源程序\3_4_key.c

????.......???????380??2008-11-23?10:54??MCP2515源程序\delay.c

????.......??????3556??2009-02-15?15:23??MCP2515源程序\display.C

????.......??????2732??2009-08-15?14:50??MCP2515源程序\main.c

????.......??????5683??2009-08-15?14:51??MCP2515源程序\main.LST

????.......?????29970??2009-08-15?14:51??MCP2515源程序\main.OBJ

????.......?????25924??2009-08-15?14:51??MCP2515源程序\MCP2515

????.......??????1912??2009-03-10?10:56??MCP2515源程序\MCP2515.h

????.......??????5475??2009-08-15?14:51??MCP2515源程序\MCP2515.hex

????.......?????29887??2009-08-15?14:51??MCP2515源程序\MCP2515.M51

????.......??????1411??2009-08-17?14:47??MCP2515源程序\MCP2515.Opt

????.......???????154??2009-08-17?14:47??MCP2515源程序\MCP2515.plg

????.......??????2053??2009-07-19?15:16??MCP2515源程序\MCP2515.Uv2

????.......??????1411??2009-08-17?14:46??MCP2515源程序\MCP2515_Opt.Bak

????.......??????2053??2009-07-19?15:13??MCP2515源程序\MCP2515_Uv2.Bak

????.......??????5115??2002-04-16?15:32??MCP2515源程序\STARTUP.A51

????.......?????11752??2009-08-15?14:51??MCP2515源程序\STARTUP.lst

????.......???????830??2009-08-15?14:51??MCP2515源程序\STARTUP.obj

????.......??????1662??2008-10-08?14:14??MCP2515源程序\sub4094.c

????.......??????2430??2005-08-19?14:45??MCP2515源程序\SUBSPI.H

????.......??????6576??2009-07-19?15:35??MCP2515源程序\sub_mcp2515.C

????.......???????596??2008-11-23?14:34??MCP2515源程序\timer0.c

????.......??????3917??2008-11-28?16:25??MCP2515源程序\uart.c

?????目錄??????????0??2009-10-08?18:26??MCP2515源程序

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

???????????????147533????????????????????24