交流数字电压表设计实例专业（年级、班）设计人指导教师辅导教师2009 年01 月01 日（设计结束日）交流数字电压表学号：姓名：班级：一、实验目的1、了解硬件平台的各个模块及其作用；2、能运用硬件平台上的各个模块完成各项设计；3、能熟练运用keil软件进行编程设计。
二、实验内容在所给硬件平台的基础上，并利用keil软件完成一个交流数字电压表。
主要由检测、显示、档位和A/D、单片机灯组成要求：①用4位数码管实时显示被测量交流电压的峰值，单位为V②测量范围：0～1999V③测量误差不超过15％④用4各按键选择档位三、硬件设计电路图为：AC－DC转换电路AD转换数码管显示检测电路按键电路：四、软件设计#include <reg52.h>#include <intrins.h>#include <string.h>#define uchar unsigned char#define uint unsigned int#define Busy 0x80 Busy #define LCM_Data P0 #define LCM_RS P2_7#define LCM_RW P2_6#define LCM_E P2_5#define ALE P2_4#define START P3_2#define OE P2_3#define EOC P3_3#define A P2_0#define B P2_1#define C P2_2sbit P3_6=P3^6;sbit P3_5=P3^5;sbit P3_4=P3^4;sbit P3_2=P3^2;sbit P3_3=P3^3;sbit P2_5=P2^5;sbit P2_6=P2^6;sbit P2_4=P2^4;sbit P2_0=P2^0;sbit P2_1=P2^1;sbit P2_2=P2^2;sbit P2_3=P2^3;sbit P2_7=P2^7;uchar data ad;char ch=0;float volt;uchar data NDIG;uchar X,Y;bit key1=0,key2=0;uchar code W[] = " good luck ";uchar code hhuc[]="this is micheal";uchar code tongdao[]="tongdao : ";uchar code danwei[]=" v ";void delayms(uint n);void WriteDataLCM(uchar WDLCM);void WriteCommandLCM(uchar WCLCM,uBuysC);void CheckBusy_LCM(void);void LCMInit(void);void DisplayOneChar(uchar X, uchar Y, uchar DData); void DisplayListChar(uchar X,uchar Y, uchar *DData); void disp(uchar xx, uchar yy,float canshu);void nextp(void);void WriteDataLCM(uchar WDLCM){CheckBusy_LCM();LCM_RS = 1;LCM_RW = 0;LCM_Data = WDLCM;LCM_E = 1;_nop_();_nop_();_nop_();LCM_E = 0;}void WriteCommandLCM(uchar WCLCM,bit BuysC) {if (BuysC) CheckBusy_LCM();LCM_RS = 0;LCM_RW = 0;LCM_Data = WCLCM;LCM_E = 1;LCM_E = 1;_nop_();_nop_();_nop_();LCM_E = 0;}void CheckBusy_LCM(void){LCM_Data = 0x0FF;LCM_E = 1;LCM_RS = 0;LCM_RW = 1;_nop_();_nop_();_nop_();while (LCM_Data & Busy);LCM_E = 0;}void LCMInit(void){WriteCommandLCM(0x38,0);delayms(5);WriteCommandLCM(0x38,0);delayms(5);WriteCommandLCM(0x38,0);delayms(5);WriteCommandLCM(0x38,1);delayms(5);WriteCommandLCM(0x08,1);delayms(5);WriteCommandLCM(0x01,1);delayms(5);WriteCommandLCM(0x06,1);delayms(5);WriteCommandLCM(0x0C,1); delayms(5);}void DisplayOneChar(uchar X, uchar Y, uchar DData) {Y &= 0x01;X &= 0x0F;if (Y) X |= 0x40;X |= 0x80;WriteCommandLCM(X, 1);WriteDataLCM(DData);}void DisplayListChar(uchar X, uchar Y, uchar *DData) {uchar ListLength;ListLength = 0;Y &= 0x01;X &= 0x0F;while (X<NDIG){DisplayOneChar(X, Y, DData[ListLength]); ListLength++;X++;}}void delayms(uint n){for(n=125*n;n;n--);}void read_ad(uchar port){switch(port){case 0:A=0;B=0;C=0;break;case 1:A=1;B=0;C=0;break;case 2:A=0;B=1;C=0;break;case 3:A=1;B=1;C=0;break;case 4:A=0;B=0;C=1;break;case 5:A=1;B=0;C=1;break;case 6:A=0;B=1;C=1;break;case 7:A=1;B=1;C=1;break;default:break;}OE=0;ALE=0;START=0;ALE=1;START=1;ALE=0;START=0;while(!EOC);OE=1;P0=0x0ff;ad=0xff&P1;OE=0;volt=(ad/255.0)*5;}void nextp(void){X+=1;if(X==16){ X=0;Y+=1;}if(Y==2){Y=0;}}void disp(uchar xx, uchar yy,float canshu){uint b1,b2;float d;uint bb;bit flag=0;X=xx;Y=yy;b2=(uint)canshu;b1=b2;bb=b1+'0';DisplayOneChar(X,Y,bb);nextp();DisplayOneChar(X,Y,'.');nextp();d=canshu-b2;bb=(uint)(d*10)+'0';DisplayOneChar(X,Y,bb);nextp();bb=(uint)(d*100)+'0';DisplayOneChar(X,Y,bb);nextp();}void key_scan(void){uint i;if(P3_5==0){for(i=5000;i>0;i--);if(P3_5==0)key1=1;while(!P3_5);} if(P3_6==0){for(i=5000;i>0;i--);if(P3_6==0)key2=1;while(!P3_6);} }void key_Process(void){if(key1){ch++;key1=0;}if(key2){ch--;key2=0;}if(ch>7)ch=0;if(ch<0)ch=7;DisplayOneChar(7,0,'0'+ch);}void main(void){uchar j;LCMInit();NDIG=strlen(W);DisplayListChar(0, 0, W);NDIG=strlen(hhuc);DisplayListChar(0, 1, hhuc);for(j=30;j>0;j--){delayms(20);}WriteCommandLCM(0x01,1);NDIG=strlen(tongdao);DisplayListChar(0, 0, tongdao);NDIG=strlen(danwei);DisplayListChar(0, 1, danwei);while(1){key_scan();key_Process();read_ad(ch);disp(10, 1,volt);}}。
