?? 單片機(jī)計(jì)算器.c
字號(hào):
/******************************************************************************************/
/* 簡(jiǎn)易計(jì)算器測(cè)試程序 */
/* 作者：蔡飛，樊世杰，郭偉劍，李洋，羅濤，崔昕剛，韓邦生，董鑫 */
/* 時(shí)間：2006。9。21 */
/* 電子科學(xué)與工程學(xué)院 學(xué)員四隊(duì) */
/******************************************************************************************/
#include <absacc.h>
#include <reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint8 unsigned char
#define uint16 long
#define LED1 XBYTE [0xA000]
#define LED2 XBYTE [0xA001]
#define LED3 XBYTE [0xA002]
#define LED4 XBYTE [0xA003]
#define LED5 XBYTE [0xA004]
#define LED6 XBYTE [0xA005]
#define LED7 XBYTE [0xA006]
#define LED8 XBYTE [0xA007]
#define KEY XBYTE [0xA100]
/*掃描鍵盤使用的變量 */
sbit first_row = P1^4; //鍵盤第一行控制
sbit second_row = P1^3; //鍵盤第二行控制
bit first_getkey = 0,control_readkey = 0; //控制是否讀鍵盤
bit getkey = 0; //獲得有效鍵值標(biāo)志位 等于1時(shí)代表得到一個(gè)有效鍵值
bit keyon = 0; //防止按鍵沖突標(biāo)志位
bit haveread = 0;//標(biāo)志是否讀了鍵盤
uchar keynum = 0; //獲得的有效按鍵值寄存器
/*數(shù)碼管顯示使用的變量和常量*/
uchar lednum = 0; //數(shù)碼管顯示位控制寄存器
uchar led[8] = {0,0,0,0,0,0,0,0}; //數(shù)碼管顯示內(nèi)容寄存器
uchar code segtab[18] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xbf,0xff}; //七段碼段碼表
// "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "P" ,"black"
void leddisp(void); //數(shù)碼管顯示函數(shù)
void readkey(void); //讀鍵盤函數(shù)
void Displayb(uint16 shu);//顯示預(yù)設(shè)值
void Readanddisplay(void);
void delay(uint8 time_nop);
void Displaya(bit v);
void Displayc(void);
void intT0() interrupt 1 //T0 定時(shí)中斷處理函數(shù)
{
TH0 = -2720/256; //定時(shí)器中斷時(shí)間間隔 4ms
TL0 = -2720%256;
leddisp(); //每次定時(shí)中斷顯示更新一次
if(control_readkey == 1) //掃描一次鍵盤
{
readkey();
control_readkey = !control_readkey;
haveread=1;
}
}
void main(void)
{
TMOD = 0x01; //
TH0 = -2720/256; //定時(shí)器中斷時(shí)間間隔 4ms
TL0 = -2720%256;
TCON = 0x10;
ET0 = 1;
EA = 1;
delay(20);
Readanddisplay();
}
void Displayb(uint16 b)
{
uint8 i;
uint16 o=b;
if(b>=0)
Displaya(1);
else
Displaya(0);
if (o<0)
o=-o;
for(i=0;i<=6;i++)
{
led[i]=o%10;
o=o/10;
}
}
void Displaya(bit v)
{
if(v==0)
led[7]=16;
else
led[7]=17;
}
void Displayc(void)
{
led[1]=17;
led[2]=17;
led[3]=17;
led[4]=17;
led[5]=17;
led[6]=17;
}
void Readanddisplay(void)
{
uint16 shu1=0,shu2=0;
uint8 k=0;
bit f=0;
while(1)
{
do
{
control_readkey=1;
while(haveread==0);
haveread=0;
}while(getkey==0);
getkey =0;
switch(keynum)
{
case 0x0a : k=1;if(shu1!=0)
shu2=shu1;f=0;Displaya(1);Displayc();led[0]=10;
shu1=0;break;
case 0x0b : k=2;if(shu1!=0)
shu2=shu1;f=0;Displaya(1);Displayc();led[0]=11;
shu1=0;break;
case 0x0c : k=3;if(shu1!=0)
shu2=shu1;f=0;Displaya(1);Displayc();led[0]=12;
shu1=0;break;
case 0x0d : k=4;if(shu1!=0)
shu2=shu1;f=0;Displaya(1);Displayc();led[0]=13;
shu1=0;break;
case 0x0e :
if ((k==2)&&(shu2!=0)&&(shu1!=0))
{
shu2-=shu1;shu1=0;
if(shu2<0)
Displaya(0);
Displayb(shu2);break;
}
if ((k==1)&&(shu2!=0)&&(shu1!=0))
{
shu2+=shu1;shu1=0;
if(shu2<0)
Displaya(0);
Displayb(shu2);break;
}
if ((k==3)&&(shu2!=0)&&(shu1!=0))
{
shu2*=shu1;shu1=0;
if(shu2<0)
Displaya(0);
Displayb(shu2);break;
}
if ((k==4)&&(shu2!=0)&&(shu1!=0))
{
if(shu1!=0) shu2/=shu1;
shu1=0;
if(shu2<0)
Displaya(0);
Displayb(shu2);break;
}
else
break;
case 0x0f : Displaya(0);f=1;break;
default :if(f==1)
shu1=shu1*10-keynum;
else
shu1=shu1*10+keynum;
Displayb(shu1);
//Displayb(shu1);
break;
}
}
}
/***************************************************
鍵盤掃描函數(shù)
原型: void readkey(void);
功能: 當(dāng)獲得有效按鍵時(shí),令getkey=1，keynum為按鍵值
****************************************************/
void readkey(void)
{
uchar M_key = 0;
first_row = 0;
second_row = 0;
M_key = KEY;
if(M_key != 0xff) //如果有連續(xù)兩次按鍵按下，認(rèn)為有有效按鍵按下。消除按鍵抖動(dòng)
{
if(first_getkey == 0)
{
first_getkey = 1;
}
else //當(dāng)有有效按鍵按下時(shí)，進(jìn)一步識(shí)別是哪一個(gè)按鍵
{
if(keyon == 0) //防止按鍵沖突，當(dāng)還有未釋放的按鍵時(shí)不對(duì)其它按鍵動(dòng)作響應(yīng)
{
first_row = 0; //掃描第一行按鍵
second_row = 1;
M_key = KEY;
if(M_key != 0xff)
{
switch(M_key)
{
case 0xfe:
keynum = 0x00;
break;
case 0xfd:
keynum = 0x01;
break;
case 0xfb:
keynum = 0x02;
break;
case 0xf7:
keynum = 0x03;
break;
case 0xef:
keynum = 0x04;
break;
case 0xdf:
keynum = 0x05;
break;
case 0xbf:
keynum = 0x06;
break;
case 0x7f:
keynum = 0x07;
break;
}
}
else
{
second_row = 0; //掃描第二行按鍵
first_row = 1;
M_key = KEY;
switch(M_key)
{
case 0xfe:
keynum = 0x08;
break;
case 0xfd:
keynum = 0x09;
break;
case 0xfb:
keynum = 0x0a;
break;
case 0xf7:
keynum = 0x0b;
break;
case 0xef:
keynum = 0x0c;
break;
case 0xdf:
keynum = 0x0d;
break;
case 0xbf:
keynum = 0x0e;
break;
case 0x7f:
keynum = 0x0f;
break;
}
}
getkey = 1; //獲得有效按鍵數(shù)值
keyon = 1; //防止按鍵沖突，當(dāng)獲得有效按鍵時(shí)將其置1
}
}
}
else
{
first_getkey = 0;
keyon = 0; //防止按鍵沖突，當(dāng)所有的按鍵都釋放時(shí)將其清0
}
}
/***************************************************
數(shù)碼管顯示函數(shù)
原型: void leddisp(void);
功能: 每次調(diào)用輪流顯示一位數(shù)碼管
****************************************************/
void leddisp(void)
{
switch(lednum) //選擇需要顯示的數(shù)碼位
{
case 0:
LED1 = segtab[led[0]];
break;
case 1:
LED2 = segtab[led[1]];
break;
case 2:
LED3 = segtab[led[2]];
break;
case 3:
LED4 = segtab[led[3]];
break;
case 4:
LED5 = segtab[led[4]];
break;
case 5:
LED6 = segtab[led[5]];
break;
case 6:
LED7 = segtab[led[6]];
break;
case 7:
LED8 = segtab[led[7]];
break;
}
if(lednum == 0) //更新需要現(xiàn)實(shí)的數(shù)碼位
{
lednum = 7;
}
else
{
lednum = lednum-1;
}
}
/*******************************************************************
延時(shí)函數(shù)
函數(shù)原型: void delay(uint8 time_nop);
功能: 延時(shí)time_nop個(gè)nop
********************************************************************/
void delay(uint8 time_nop)
{
uint8 i;
for(i=0;i<time_nop;i++)
{
_nop_();
}
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