蘇州高博軟件技術職業學院畢業設計（論文）報告參考文獻程民利.基于霍爾傳感器的高精度測速電路設計[J].電子設計工程,2013,21(8):109-111楊建潮.出租汽車計價器的計價原理[J].檢定與規程,2011,(2):44-45黃代福.出租車計價器傳感器原理及檢測[J].計量與檢測技術,2016,(8):20-21李平,周原.基于AT89C51和DDS技術的信號發生器設計[J].電子設計工程.2014(10)王翠.基于單片機的出租車計價系統設計[J].現代電子技術.2012(05)姚利彬,許勇,潘明.基于AT89C51的出租車計費系統的設計與實現[J].電子設計工程.2011(23)曹公正,陳娟,張寶利,陳乾輝.AT89C51在出租車記費器上的研究與設計[J].長春工業大學學報(自然科學版).2014(03)陳英梅,席亮亮.基于AT89C51的多種分頻設計與實現[J].電子元器件應用.2015(06)附錄總電路圖主程序：#include<reg52.h>#include<intrins.h>#include<AT24C02.h>#defineucharunsignedchar#defineuintunsignedint ucharcodetable_du[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};ucharcodetable_we[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; uchartt,aa;ucharquanshu;ucharsecond,minute;uintround;ucharround_24c02[2];uintdistance;uintprice,cost;uintwait;ucharqian,bai,shi,ge;sbitkey0=P3^1;sbitkey1=P3^0;sbitkey2=P1^7;sbitkey3=P1^6;sbitkey4=P1^5;sbitled0=P1^0;sbitled1=P1^1;sbitled2=P1^2;sbitled3=P1^3;sbitled4=P1^4;bit key0_flag;bit key1_flag;bit key2_flag;bit key3_flag;bit flag;voiddelayms(unsignedintc){ unsignedcharb; for(;c>0;c--) for(b=110;b>0;b--);}voiddelay_dis(void){ unsignedcharb,c; for(c=7;c>0;c--) for(b=110;b>0;b--);} voidinit_data(void){ distance=0; cost=0; round=0; second=0; minute=0; key0_flag=0; key1_flag=0; key2_flag=1; key3_flag=0; flag=1;}voidjisuan(void){wait=minute*60+second; distance=round+wait/30; if(key1_flag) price=15; else price=20; if(distance<=30) cost=50; else cost=price*(distance-30)/10+50;}voidfenli(uinttemp){ if(temp>9999) temp=9999; qian=temp/1000; bai=temp/100%10; shi=temp%100/10; ge=temp%10;}voidwrite(void){ round_24c02[0]=round&0x00ff; round_24c02[1]=(round>>8)&0x00ff; write_24c02(0x00,key0_flag); write_24c02(0x01,key1_flag); write_24c02(0x02,key2_flag); write_24c02(0x03,key3_flag); write_24c02(0x04,second); write_24c02(0x05,minute); write_24c02(0x06,round_24c02[0]); write_24c02(0x07,round_24c02[1]);}voidread(void){ key0_flag=read_24c02(0x00); key1_flag=read_24c02(0x01); key2_flag=read_24c02(0x02); key3_flag=read_24c02(0x03); second=read_24c02(0x04); minute=read_24c02(0x05); round_24c02[0]=read_24c02(0x06); round_24c02[1]=read_24c02(0x07); round=round_24c02[1]; round=(round<<8 )|round_24c02[0];}voiddisplay(void){ uinttemp; if(key2_flag) { fenli(distance); P2=table_we[7]; P0=table_du[ge]; delay_dis(); P2=table_we[6]; P0=table_du[shi]|0x80; delay_dis(); P2=table_we[5]; P0=table_du[bai]; delay_dis(); P2=table_we[4]; P0=table_du[qian]; delay_dis(); } else { temp=minute*100+second; fenli(temp); P2=table_we[7]; P0=table_du[ge]; delay_dis(); P2=table_we[6]; P0=table_du[shi]; delay_dis(); P2=table_we[5]; P0=table_du[bai]|0x80; delay_dis(); P2=table_we[4]; P0=table_du[qian]; } fenli(cost); P2=table_we[3]; P0=table_du[ge]; delay_dis(); P2=table_we[2]; P0=table_du[shi]|0x80; delay_dis(); P2=table_we[1]; P0=table_du[bai]; delay_dis(); P2=table_we[0]; P0=table_du[qian]; led0=key0_flag; led1=!key1_flag; led2=key2_flag; led3=!key3_flag; led4=flag;}voidkeyscan(void){ if(key0==0) { delayms(10); if(key0==0) { key0_flag=!key0_flag; if(!key0_flag) init_data(); while(!key0); } } if(key1==0) { delayms(10); if(key1==0) { key1_flag=!key1_flag; while(!key1); } } if(key2==0) { delayms(10); if(key2==0) { key2_flag=!key2_flag; while(!key2); } } if(key3==0) { delayms(10); if(key3==0) { key3_flag=!key3_flag; if(key3_flag) { EX0=0; TR0=0; } else { EX0=1; TR0=1; } while(!key3); } } if(key4==0) { delayms(10); if(key4==0) { read(); while(!key4); } }}voidmain(void){ init_data(); TMOD=0x01; TH0=(65536-50000)/256; TL0=(65536-50000)%256; ET0=1; IT0=0; EA=1; EX0=1; TR0=1; while(1) { keyscan(); jisuan(); write(); display(); } }voidzd(void)interrupt0{ aa++; if(flag) { quanshu++; if(quanshu>=57) { round++; quanshu=0; } } }voidtimer0(void)interrupt1{ TH0=(65536-50000)/256; TL0=(65536-50000)%256; tt++; if(tt>=20) { tt=0; if(aa<=5)flag=0; elseflag=1; aa=0; if(!flag) { second++; if(second==60) { minute++; second=0; } } }}#include<AT24C02.h>#definesomenop{_nop_();_nop_();_nop_();_nop_();_nop_();}#defineSlaveAddrW0xAE //0xae,a0#defineSlaveAddrR0xAF //0xaf,a1sbitSDA=P3^6;/*數據線*/sbitSCL=P3^7;/*時鐘線*/voidIIC_Start(void){ SDA=1; SCL=1; somenop; SDA=0; somenop; SCL=0; }voidIIC_Stop(void){ SDA=0; SCL=1; somenop; SDA=1;}voidIIC_Ack(bitackbit){ if(ackbit) { SDA=0; } else { SDA=1; } somenop; SCL=1; somenop; SCL=0; SDA=1; somenop;}bitIIC_WaitAck(void){ SDA=1; somenop; SCL=1; somenop; if(SDA) { SCL=0; IIC_Stop(); return0; } else { SCL=0; return1; }}voidIIC_SendByte(unsignedcharbyt){ unsignedchari; for(i=0;i<8;i++) { if(byt&0x80) { SDA=1; } else { SDA=0; } somenop; SCL=1; byt<<=1; somenop; SCL=0; }}unsignedcharIIC_RecByte(void){ unsignedcharda; unsignedchari; for(i=0;i<8;i++) { SCL=1; somenop; da<<=1; if(SDA) da|=0x01; SCL=0; somenop; } returnda;}unsignedcharread_24c02(unsignedcharadd){ unsignedchartemp; IIC_Start(); IIC_SendByte(0xa0); IIC_WaitAck(); IIC_SendByte(add); IIC_WaitAck();