一个单片机的简易计算器

 //-----------------------------------------------------------------------------
// 
// 目标器件: C8051F320x
//
// 编译工具: Silicon Laboratories IDE
//
//-----------------------------------------------------------------------------
//程序描述：
//  16 Key + LCD Display
//  可以进行正整数的加、减、乘、整除运算，计算结果显示范围：-9999999~99999999
//-----------------------------------------------------------------------------
// 头文件包含
//-----------------------------------------------------------------------------
#include <c8051F320.h>                
//;************************************************************************
//;*  p1.0 : 1st column (k0,k4,k8,kc)
//;*  p1.1 : 2nd column (k1,k5,k9,kd)
//;*  p1.2 : 3rd column (k2,k6,ka,ke)
//;*  p1.3 : 4th column (k3,k7,kb,kf)
//;*  p1.4 : 1st row (k0,k1,k2,k3)  p1.7-p1.4 connect to 74LS21
//;*  p1.5 : 2nd row (k4,k5,k6,k7)
//;*  p1.6 : 3rd row (k8,k9,ka,kb)
//;*  p1.7 : 4th row (kc,kd,ke,kf)
//:*  p2.6 : =0 a key is pressed   
//;**********************************

//-----------------------------------------------------------------------------
//全局变量定义
//-----------------------------------------------------------------------------

                                 
unsigned char DispData0[8]={'0',' ',' ',' ',' ',' ',' ',' '};//                       
unsigned int x;
unsigned char *lcdpoint0;         //指向 lcddata数组的指针
unsigned char *lcdpoint1;         //指向 lcddata数组的指针
sbit rs = P2^3;
sbit e = P2^5;
sbit aKey = P2^6;
//-----------------------------------------------------------------------------
// 函数定义
//-----------------------------------------------------------------------------
void PORT_Init (void);           //通用I/O口及交叉开关初始化
void SYSCLK_Init (void);         //系统时钟初始化
void LCD_Init(void);             //液晶初始化
void LCD_Instruction(unsigned char comnd);
void LCD_Data(unsigned char data0);
void LCD_Display (void);
void Delay8_33us(unsigned int iM);

void ClearLCD(void);   //清除显示内容
void GetKey(unsigned char chkey);//获得显示字符
void GetResult(void);     // 计算结果
int ii,i=0;
unsigned char columNum;          //列号
unsigned char rowNum;            //行号
unsigned char tt;
unsigned char key;
 
//-----------