main.c

基于51单片机的简易计算器

#include"reg52.h"
#include"math.h"

#define uchar unsigned char
#define uint unsigned int

#define key P3
#define duan P2
#define wei P1

sbit led=P0^0;
sbit buzzer=P0^1;

uchar num,temp,num1,i=0;
long bczs=0,czs=0,jiguo=0,jiguo1=0;
uchar czs12=1;	  //输入数的选择标志位，１为第一个数，２为第二个数
uchar yiweiflag,qinflag;  //移位标志

uchar code shuzi[12]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff,0xbf};	 //0~9,-,
uchar code weizi[9]={0x00,0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
uchar code error[10]={0xff,0xaf,0xc0,0xaf,0xaf,0x86,0xff,0xff,0xff};//error
uchar playshuzu[9],fuhao;
uchar zhi,weishu=0;

void init();		  //函数申明
uchar keyscan();
uchar scanzhi();
void display();
void duzhichuli();
void zhuandisplayjiguo();
void jiafa();
void jianfa();
void chengfa();
void chufa();
void qin();
void displayerror();
//======================================
void main()			  //主函数
{
	init();
	display();
	while(1)
	{
		duzhichuli();
	}
}
//===============================================================================
void init()
{
	uchar i;
	czs12=1;
	yiweiflag=1;  //１不移
	qinflag=0;    //不清除
	duan=shuzi[8];
	wei=weizi[5];
	playshuzu[1]=shuzi[0];
	for(i=2;i<9;i++)
		playshuzu[i]=shuzi[10];
		
	bczs=0;czs=0;jiguo=0,jiguo1=0;		
}
//===============================================================================
void delay(uint x)
{
	uchar y;
	for(x;x>0;x--)
		for(y=112;y>0;y--);
}

//====================================
uchar keyscan()
{
unsigned char recode,i,j;
	for(i=0;i<4;i++)
		{
			P3=~(0x01<<i);
			recode=P3>>4;
			if(recode<0x0f)
			{ 
			for(j=0;j<4;j++)
			{if(!(recode&0x01<<j))break;} 
			return (i<<2)+(j+1); //返回键值 1-16
			} 
			delay(5); //延时5ms
		}
   return 0; //无按键返回
}
//========================================
uchar scanzhi()
{
	uchar zhi,k;
	k=keyscan();
	switch(k)
	{
		case 0: zhi=27;break;
		case 1: zhi=7;break;
		case 2: zhi=8;break;
		case 3: zhi=9;break;
		case 4: zhi=24;break;   // /

		case 5: zhi=4;break;
		case 6: zhi=5;break;
		case 7: zhi=6;break;
		case 8: zhi=23;break;   //*

		case 9: zhi=1;break;
		case 10: zhi=2;break;
		case 11: zhi=3;break;
		case 12: zhi=22;break;   //-

		case 13: zhi=26;break;	//nc
		case 14: zhi=0;break;
		case 15: zhi=25;break;  //=
		case 16: zhi=21;break;  //+
	}
	return(zhi);
}
//===========================================
void duzhichuli()
{
	uchar tt,u;

	tt=scanzhi();
	if(tt!=27)
	{
		led=0;
		buzzer=0;
		if(tt<=9)//数字输入
		{
			if(qinflag==1)  qin();
				qinflag=0;
			if(yiweiflag!=1)
			{
				for(u=8;u>1;u--)			 //移位输入
				{
					playshuzu[u]=playshuzu[u-1];
				} 
			}
			yiweiflag=0;    //移位
			playshuzu[1]=shuzi[tt];	
			if(czs12==1)   bczs=bczs*10+tt;			//
			if(czs12==2)   czs=czs*10+tt;		
		}
		if(tt>20)//符号输入
		{
			switch(tt)
			{
				case 21: 	jiafa();break;		//+
				case 22:    jianfa();break;		//-
				case 23:    chengfa();break;	//*
				case 24:    chufa();break;
				case 25:    zhuandisplayjiguo();break;		//=
				case 26:    init();break;		//nc
			}		
		} 
	}
  //-----------------------------------------------
	while(tt!=27)	   //松手检测
	{
		led=0;
		buzzer=0;
		tt=scanzhi();
		delay(1);
		if(tt==27) goto chu;
	}

	chu: delay(1);
	led=1;
	buzzer=1;
}

//============================================
void display()
{

	TMOD=0x01;
	TH0=(65536-200)/256;
	TL0=(65536-200)%256;
	EA=1;
	ET0=1;
	TR0=1;

}
void TIME0(void) interrupt 1
{
	TH0=(65536-200)/256;
	TL0=(65536-200)%256;
	i++;
	if(i==9) i=1;
    	wei=weizi[i];
	    duan=playshuzu[i];	
}
//===============================================	   //显示数转操作数
void zhuandisplayjiguo()
{
	uchar i,k;
	long ttt;

	for(i=1;i<9;i++)
		playshuzu[i]=shuzi[10];
    //----------------------------------------
	switch(fuhao)
	{
		case 1: jiguo=bczs+czs;break;
		case 2: jiguo=bczs-czs;break;
		case 3: jiguo=bczs*czs;break;
		case 4: jiguo=bczs/czs;break;
		case 0: jiguo=jiguo1;break;
	}
	fuhao=0;

	//----------------------------------------
	ttt=jiguo;
	jiguo1=jiguo;							   //显示处理
	k=1;					//取数的个数
    for(i=1;i<=8;i++)
	   {
	   		if(ttt/10!=0)  k++;
			ttt=ttt/10;	
	   }	

	for(i=8;i>k;i--)
	   {
	   		playshuzu[i]=shuzi[10];
	   }
	if(jiguo<0)  { jiguo=fabs(jiguo);playshuzu[k+1]=shuzi[11]; }   //取正加负号
	
	for(i=1;i<=k;i++)
	   {
	   		playshuzu[i]=shuzi[jiguo%10];
			jiguo=jiguo/10;	
	   }
	if(jiguo1>99999999) displayerror();
	
}
//===================================================
void qin()
{
	uchar i;
	yiweiflag=1;  //１不移
	playshuzu[1]=shuzi[0];
	for(i=2;i<9;i++)
		playshuzu[i]=shuzi[10];
}
//===================================================
void displayerror()
{
	uchar i;
	for(i=1;i<=8;i++)
		playshuzu[i]=error[i];
}
//===================================================
void jiafa()   //+
{

	qinflag=1;
    if(jiguo1!=0) bczs=jiguo1;
	czs=0;
	czs12=2;
	fuhao=1;   //+		
}

void jianfa()
{

	qinflag=1;
	if(jiguo1!=0) bczs=jiguo1;
	czs=0;
	czs12=2;
	fuhao=2;   //-
}

void chengfa()
{

	qinflag=1;
	if(jiguo1!=0) bczs=jiguo1;
	czs=0;
	czs12=2;
	fuhao=3;   //*	
}

void chufa()
{

	qinflag=1;
	if(jiguo1!=0) bczs=jiguo1;
	czs=0;
	czs12=2;
	fuhao=4;   // /
}