电压表程序代码

1、编者：PYH日期：功能：实现ADC0809采集05V电压采集，通过按键可选择02,3个通道切换，要选择其他通道按同理写按键函数即可，采用1602显示.*/maiii.c文卜#iiiclude#iiiclude#iiicluden1602.ir#includedelay.h”frdefineumtunsignedmt#defineuchaiunsignedchar芦*ADC0809引脚定义*/sbitCLK=P2Z6;sbitST=P2A3;sbitALE=P2A7;sbitOE=P2A5;sbitEOC=P2A4;sbitADDA=P3Z5;sbitADDB=P3A6;sbitADDC=P3A

2、7;/*按键定义*/sbitKEY1=P3A2;sbitKEY2=P3A3;sbitKEY3=P3A4;芦*函数声明*/voidADC0809_uut();/ADC0809初始化函数unsignedcharRead_AD();/读取AD数据函数unsignedcharkeyscaii();通道选择函数voidmain()(uclwnum=0;unsignedchaitemp7;显示区域临时存储数组floatVoltage;浮点变量ADC0809_uut();LCD_Imt();/LCD初始化DelayMs(20);LCD.ClearQ;清屏LCD_W【ite_Stnng(3,0,PYH_DVM

3、设置表头ADC0809uut();/AD0809初始化ST=O;while(l)ST=1;启动ADC0809ST=O;keyscan();。2num=Read_AD();读取AD0809数据Vbltage=(float)num*5/256;数据转换，float是强制转换符号，将结果转换为浮点型spimtf(temp,VO:%3.2f,Voltage);格式输出电压值，3.2表示浮点输出，小数点后两位LCD_Wiite_Stiing(2,l,temp);将数据写入1602显示)voidtimerO(void)intemipt1中断处理函数，产生约500KHZ时钟供0809工作(TH0=(6553

4、6-200)/256;TL0=(65536-200)%256;CLK-CLK;voidADC0809_uut()/ADC0809初始化(TMOD=0 x01;TH0=(65536-200)/256;TL0=(65536-200)%256;ET0=l;TR0=l;EA=1;DelayMs(2);unsignedcharRead_AD()读ADC0809数据(uchartemp=0;/存放AD采集的数据wlnle(EOC=0);等待转换完成OE=1;temp=Pl;读取数据DelayMs(l);OE=0;returntemp;unsignedcharkeyscan()(if(KEYl=O)选择通道

5、0ALE=1;/允许写入地址ADDA=O;ADDB=O;ADDC=O;ALE=O;)elseif(KEY2=0)选择通道1ALE=1;ADDA=1;ADDB=O;ADDC=O;ALE=O;elseif(KEY3=0)选择通道2ALE=1;ADDA=0;ADDB=1;ADDC=0;ALE=0;)/*其他通道同理写入地址即可*/)#ifhdef_DELAY_H_#define_DELAYHus延时函数，含参，t值范围0255*voidDelayUs2x(unsignedchart);ms延时函数，含参，t值范围O255*voidDelayMs(unsignedchart);#endif#inclu

6、dedelay.h”voidDelayUs2x(unsignedchart)(vliile(t);voidDelayMs(unsignedchart)(while。-)(大致延时InisDelayUs2x(245);DelayUs2x(245);)#iiiclude/#iiiclude#ifhdef_1602_H_#define_1602_H_bitLCD_Check_Busy(void);voidLCD_Write_Com(unsignedcharcom);voidLCD_Write_Data(unsignedcharData);voidLCD_Cleai(void);voidLCD_Wri

7、te_Stimg(unsignedchaix,unsignedchary,unsignedchar*s);voidLCD_Write_Char(unsignedcharx,unsignedchary,unsignedcharData);voidLCD_Init(void);#endif1602.C文件#includen1602.hM#includedelay.h”sbitRS=P2A0;端II定义sbitRW=P2Al;sbitEN=P2A2;defineRS_CLRRS=OdefineRS.SETRS=1#defineRW.CLRRW=OdefineRW_SETRWE#defineEN_CL

8、REN=O#defineEN_SETEN=1#defineDataPortPO判忙函数*bitLCD_Check_Busy(void)DataPoit=OxFF;RS_CLR;RW_SET;EN_CLR;_nop_0；EN_SET;return(bit)(DataPort&0 x80);)写入命令函数*/voidLCD_Wnte_Com(unsignedcharcom)DelayMs(5);RS_CLR;RW_CLR;EN_SET;DataPoit=com;_nop_0；EN_CLR;)写入数据函数*/voidLCD_Wnte_Data(unsignedcharData)(DelayMs(5)

9、;RS_SET;RW_CLR;EN_SET;DataPort=Data;_nop_0；EN_CLR;)清屏函数*/voidLCD_Cleai(void)(LCD.Wnte_Com(OxO1);DelayMs(5);)/*写入字符串函数*/voidLCD_Write_Stimg(unsignedchaix,unsignedchary,unsignedchar*s)iif(y=0)LCD_Write_Com(0 x80+x);表示第一行elseLCD_WHte_Com(0 xC0+x);表示第二行wliile(*s)LCD.Wnte.Data(*s);S+；)芦写入字符函数*/*voidLCD_Write_Char(uiisignedcharx,unsignedchaiy.unsignedcharData)if(y=0)LCD_Wiite_Com(0 x80+x);elseLCD_Wiite_Com(0 xC0+x);)LCD-Wiite_Data(Data);*/*初始化函数*/voidLCD_Init(void)_LCD_Wnte_Com(0 x38);六显示模式设置*/DelayMs(5);LCD_Wnte_Com(0 x38);DelayMs(5);LCD_Wnte_Com(0 x38);DelayMs(5