用8051与1601LCD设计的整数计算器.doc

/-Main.c-/名称：用8051与1601LCD设计的整数计算器/-#include #include #include calc.hstatic data long lvalue;static data long rvalue;static data char currtoken;static data char lasttoken;static data char lastpress;static xdata char outputbufferMAX_DISPLAY_CHAR;/输出缓冲/-/主程序/-void main()/变量初始化lvalue=0;rvalue=0;currtoken=;lasttoken=;/初始化LCDinitialise();calc_putput(OK);calc_evaluate();/-/获取按键值并进行计算处理/-void calc_evaluate()char data key;int data i;char xdata numberMAX_DISPLAY_CHAR;char xdata *bufferptr;/清除缓冲for(i=0;i=MAX_DISPLAY_CHAR;i+) numberi= ;bufferptr=number;while(1)key=calc_getkey();if(calc_testkey(key)if(bufferptr!=&numberMAX_DISPLAY_CHAR-2)*bufferptr=key;calc_display(number);bufferptr+;elseif(lasttoken=0) lvalue=calc_asciidec(number);elservalue=calc_asciidec(number);/清除数字蝗虫bufferptr=number;for(i=0;i=MAX_DISPLAY_CHAR;i+)numberi= ;/处理操作符currtoken=key;if(currtoken=C)calc_opfunctions(currtoken);elsecalc_opfunctions(lasetoken);/清除输出缓冲for(i=0;i=-99999999&num=99999999)return OK;else return ERROR;/-/ 根据操作状态输出/-switch(status)case OK:calc_deaplay(calc_decascii(lvalue);break;case SLEEP: break;case ERROR:calc_display(Exception);break;default:calc_display(Exception)break;/-/将ASCII字符串转换为浮点数/-long calc_asciidec (char *buffer)long data value;long data digit;value=0;while(*buffer!= )digit=*buffer-0;value=value*10+digit;buffer+return value;/-/将浮点数转换为ASCII字符串/-char *calc_decascii(long num)long data temp=num;char xdata *avvayptr=&outputbufferMAX_DISPLAY_CHAR;long data divisor=10;long data result;char data remainder,asciival;int data i;/如果计算结果为0。，则在缓冲中插入0并结束if(!temp)*arrayptr=0;goto done;if(temp0) /处理负数outputbuffer0=-;temp-=2*temp;for(i=0;isizeof(outputbuffer);i+)remainber=temp%divisor;result=temp/divisor;if(!remainder)&(!result)*arrayptr= ;elseasciival=remainder+0;*arrayptr=asciival;temp/=10;/为“”号保留位置if(arrayptr!=&outputbuffer1)arrayptr-;done:return outputbuffer;/-/测试按键时数字还是操作符，如果是数字则返回1.是操作符时返回0/-char calc_testkey (char key)if(isdigit(key)return 1;elseteturn 0;/-/调用input例程搜索按键，并返回按键的ASCII码值/-char calc_getkey()char data mykey;domykey=input();while(mykey=0);return mykey;/-/调用Output和Clearscreen例程向LCD输出ASCII/-void calc_display (char bufMAX_DISPLAY_CHAR)int data i=0;clearscreen();for(i;i=MAX_DISPLAY_CHAR;i+)if(bufi!= )output(bufi);/-calc.h-/本例头文件/-typedef unsigned short WORD;typedef unsigned char BYTE;/-/定义适合屏幕显示的ASCII字符的最大个数/-#define MAX_DISPLAY_CHAR 9/-/错误处理状态/-enum ERROR OK=0,SLEEP=1,ERROR=2;/-/函数声明/-void calc_evaluate();void calc_opfunctions (char token);char calc_testkey (char ch);long calc_asciidec (char *buffer);char *calc_decascii (long num);int calc_chkerror (long num);void calc_output (int status);char calc_getkey();void calc_display(char bufMAX_DISPLAY_CHAR);void initialise();char input();char output(char ch);void clearscreen;/-lcd.c-/单行液晶显示程序/-#include#include#define uchar unsigned char#define LCD_CMD_WR 0x00#define LCD_DATA_WWR 0x01#define LCD_BUSY_RD 0x02#define LCD_DATA_RD 0x03#define LCD_PAGE 0x80#define LCD_CLS 1#define LCD_HOME 2#define LCD_SETMODE 4#define LCD_SETVISIBLE 8#define LCD_SHIFT 16#define LCD_SETFUNCTION 32#define LCD_SETCGADDR 64#define LCD_SETDDADDR 128sbit bflag=ACC7;/忙标志位void wrcmd(uchar);void output(char);void busywait();/-/初始化LCD/-void initialise()wrcmd(0x30); /1行8位wrcmd(LCD_SETVISIBLE+4); /显示开，关光标wrcmd(LCD_SETDDADDR+15); /从右边开始显示wrcmd(LCD_SETMODE+3); / 递增左移/-/清屏并将显示位置起点设置在最右边/-void clearscreen()wrcmd(LCD_CLS); wrcmd(LCD_SETDDADDR+15); /-/向LCD写命令/-void wrcmd(uchar cmd)uchar volatile pdata *p=LCD_CMD_WR;P2=LCD_PAGE;*p=cmd;/上面三行可用下面的代码替换/XBYTE0x8000=cmd;busywait();/-/向LCD写一个字符/-void output(char ch)char volatile pdata *p=LCD_DATA_WR;P2=LCD_PAGE;*p=ch;/上面三行可用下面的代码替换/XBYTE0x8001=ch;busywait();/-/忙等待/-void busywait()uchar volatile pdata *p=LCD_BUSY_RD;P2=LCD_PAGE;/上面两行可改成：/uchar volatile pdata *p=0x8002;doACC=*p;while(bflag=1);/上述所有代码也可用以下代码替换/*doACC=XBYTE0x8002;while(bflag=1);*/-keypad.c-/键盘扫描函数char input();返回按键的ASCII码/-#include#includechar code keycodes=7,8,9,/,4,5,6,*,1,2,3,-,C,0,=,+;char data keyflags16;/-/获取键盘按键子程序/-char input