/*******************************************************************************
************?????????????????LABCENTER?ELECTRONICS??????????????????************??????????????????????????????
************		?????Proteus?VSM?Sample?Design?Code?????????????************		?	
************	???????Integer?Calculator?（?2K?Code?Limit）	????????************
*******************************************************************************/

#include?
#include?
#include?“calc.h“

//Variables
static??data?LONG?lvalue;
static??data?LONG?rvalue;
static??data?CHAR?currtoken;
static??data?CHAR?lasttoken;
static??data?CHAR?lastpress;
static??xdata?CHAR?outputbuffer[MAX_DISPLAY_CHAR];

VOID?main?（VOID）
//Initialise?our?variables?and?call?the?
//Assembly?routine?to?initialise?the?LCD?display.?
?{?lvalue????=?0;
???rvalue????=?0;
???currtoken?=?‘=‘;
???lasttoken?=?‘0‘;
???initialise（）;??//?Initialize?the?LCD
???calc_output（OK）;
???calc_evaluate（）;
?}???

VOID?calc_evaluate（）
?{?CHAR?data?key;
???INT??data?i;
???CHAR?xdata?number[MAX_DISPLAY_CHAR];
???CHAR?xdata?*bufferptr;
???
???//?Clear?the?buffer?before?we?start.
???for?（i?=?0;?i?<=?MAX_DISPLAY_CHAR;?i++）
??????{?number[i]?=?‘?‘;
	??}
???bufferptr?=?number;??
???
???for?（;;）
?????{?key?=?calc_getkey（）;
	???if?（calc_testkey（key））
???????//?Key?test?positive?for?digit?so?we?read?it?into?the
???????//?buffer?and?then?write?the?buffer?to?the?screen/LCD.
	???//?Size?limit?the?number?of?digits?-?allow?for?termination
	???//?and?possible?negative?results.
??????????{?if?（bufferptr?!=?&number[MAX_DISPLAY_CHAR?-?2]）
???????????????{?*bufferptr?=?key;
?????????????????calc_display（number）;
?????????????????bufferptr++;
???????????????}
??????????}

???????else
???????//?Key?is?an?operator?so?pass?it?to?the?function?handlers.
???????//?If?we?are?just?after?startup?or?cancel?then?assign?to?lvalue
???????//?otherwise?assign?to?rvalue.
??????????{?
		????//Assign?the?value.
????????????if?（lasttoken?==?‘0‘）
???????????????{?lvalue?=?calc_asciidec?（number）;}
????????????else
???????????????{?rvalue?=?calc_asciidec?（number）;}

????????????//Clear?the?number?buffer.
????????????bufferptr?=?number;
????????????for?（i?=?0;i?<=?MAX_DISPLAY_CHAR;?i++）
???????????????{?number[i]?=?‘?‘;?}
		?
????????????//Process?the?Operator.
????????????currtoken?=?key;
			if?（currtoken?==?‘C‘）?
			???{?calc_opfunctions（currtoken）;?}
		?	else
			???{?calc_opfunctions（lasttoken）;?}
		
?		????//?Clear?the?outputbuffer?for?reuse?on?next?operation.
????????????for?（i?=?0;i?<=?MAX_DISPLAY_CHAR;i++）
???????????????{?outputbuffer[i]?=?‘?‘;}
		??????
??????	?????bufferptr?=?number;
			//?Handle?the?equals?operation?here?for?brevity.
			//?All?we?need?do?is?preserve?the?previous?operator?in
			//?lasttoken.
			if?（currtoken?!=?0x3D）?lasttoken?=?currtoken;
????????????
???		??}
???????lastpress?=?key;
?????}
?}

VOID?calc_opfunctions?（CHAR?token）
//

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

?????文件???????1808??2011-01-07?12:47??C51?Calculator\8051?Calculator.vsmp

?????文件???????6327??2011-01-07?12:47??C51?Calculator\calc

?????文件???????7998??2011-01-07?12:47??C51?Calculator\calc.c

?????文件?????176033??2011-01-07?12:47??C51?Calculator\calc.DSN

?????文件???????1467??2011-01-07?12:47??C51?Calculator\Calc.h

?????文件???????5245??2011-01-07?12:47??C51?Calculator\calc.hex

?????文件???????1185??2013-05-06?20:16??C51?Calculator\CALC.Opt

?????文件????????231??2013-05-06?22:15??C51?Calculator\calc.plg

?????文件???????1038??2013-05-18?18:29??C51?Calculator\calc.PWI

?????文件???????2016??2013-05-06?20:16??C51?Calculator\CALC.Uv2

????.......??????1016??2011-01-07?12:47??C51?Calculator\CALC_Opt.Bak

????.......??????1724??2011-01-07?12:47??C51?Calculator\CALC_Uv2.Bak

?????文件??????13748??2011-01-07?12:47??C51?Calculator\Debug\DEBUG.OMF

?????目錄??????????0??2013-05-05?11:03??C51?Calculator\Debug

?????文件???????2315??2011-01-07?12:47??C51?Calculator\KEYPAD.ASM

?????文件???????7336??2011-01-07?12:47??C51?Calculator\keypad.LST

?????文件???????2107??2011-01-07?12:47??C51?Calculator\LCD.ASM

?????文件???????6566??2011-01-07?12:47??C51?Calculator\lcd.LST

?????目錄??????????0??2013-05-18?18:29??C51?Calculator

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

???????????????238160????????????????????19