一种电压表程序源代码

main.c文件#include <reg52.h>   #include <stdio.h>#include "1602.h"#include "delay.h"#define uint unsigned int #define uchar unsigned char /****ADC0809引脚定义********************/sbit CLK=P2^6;sbit ST=P2^3;sbit ALE=P2^7; sbit OE=P2^5; sbit EOC=P2^4; sbit ADDA=P3^5;sbit ADDB=P3^6;sbit ADDC=P3^7;/*****按键定义*****/sbit KEY1=P3^2;sbit KEY2=P3^3;sbit KEY3=P3^4;/*****º函数声明*************/void ADC0809_init();//ADC0809初始化函数unsigned char  Read_AD();  //读取AD数据函数unsigned char  keyscan();  //通道选择函数void main(){ uchar num=0; unsigned char temp[7];//显示区域临时存储数组 float Voltage;        //浮点变量 ADC0809_init(); LCD_Init();           //LCD初始化 DelayMs(20);           LCD_Clear();          //清屏 LCD_Write_String(3,0,"PYH_DVM /V");//设置表头 ADC0809_init();   //AD0809初始化 ST=0;while(1){ST=1;//启动ADC0809ST=0;    keyscan();  //0~2num=Read_AD();  //读取AD0809数据Voltage=(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        sprintf(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_Write_String(2,1,temp);  //将数据写入1602显示}}void timer0(void) interrupt 1    //中断处理函数，产生约500KHz时钟供0809工作{TH0=(65536-200)/256;TL0=(65536-200)%256;CLK=~CLK; }void ADC0809_init()   //ADC0809初始化{TMOD=0x01;TH0=(65536-200)/256;TL0=(65536-200)%256;ET0=1;TR0=1;EA=1;DelayMs(2);}unsigned char  Read_AD()  //读ADC0809数据{uchar temp=0; //存放AD采集的数据while(EOC==0);//等待转换完成  OE=1; temp=P1;      //读取数据 DelayMs(1); OE=0; return temp;}unsigned char keyscan(){ if(KEY1==0)//选择通道0{  ALE=1;  //允许写入地址  ADDA=0;  ADDB=0;  ADDC=0;      ALE=0;} else if(KEY2==0)  //选择通道1      {ALE=1;ADDA=1;ADDB=0;ADDC=0;ALE=0;   }else if(KEY3==0)  //选择通道2    {ALE=1;ADDA=0;ADDB=1;ADDC=0;ALE=0;}/****其他通道同理写入地址即可********/}#ifndef __DELAY_H__#define __DELAY_H__/*------------------------------------------------us延时函数，含参，t值范围0~255------------------------------------------------*/void DelayUs2x(unsigned char t);/*------------------------------------------------ms延时函数，含参，t值范围0~255------------------------------------------------*/void DelayMs(unsigned char t);#endif#include "delay.h"void DelayUs2x(unsigned char t){    while(--t);}void DelayMs(unsigned char t){     while(t--) {     //大致延时1ms     DelayUs2x(245); DelayUs2x(245); }}#include<reg52.h> //#include<intrins.h>#ifndef __1602_H__#define __1602_H__ bit LCD_Check_Busy(void) ; void LCD_Write_Com(unsigned char com) ; void LCD_Write_Data(unsigned char Data) ; void LCD_Clear(void) ; void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s) ; void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data) ; void LCD_Init(void) ;   #endif1602.c文件#include "1602.h"#include "delay.h"sbit RS = P2^0;   //端口定义sbit RW = P2^1;sbit EN = P2^2;#define RS_CLR RS=0 #define RS_SET RS=1#define RW_CLR RW=0 #define RW_SET RW=1 #define EN_CLR EN=0#define EN_SET EN=1#define DataPort P0/*------------------------------------------------       判忙函数------------------------------------------------*/ bit LCD_Check_Busy(void)  {  DataPort= 0xFF;  RS_CLR;  RW_SET;  EN_CLR;  _nop_();  EN_SET; return (bit)(DataPort & 0x80); }/*------------------------------------------------           写入命令函数------------------------------------------------*/ void LCD_Write_Com(unsigned char com)  {   DelayMs(5); RS_CLR;  RW_CLR;  EN_SET;  DataPort= com;  _nop_();  EN_CLR; }/*------------------------------------------------       写入数据函数------------------------------------------------*/ void LCD_Write_Data(unsigned char Data)  {  DelayMs(5); RS_SET;  RW_CLR;  EN_SET;  DataPort= Data;  _nop_(); EN_CLR; }/*------------------------------------------------               清屏函数------------------------------------------------*/ void LCD_Clear(void)  {  LCD_Write_Com(0x01);  DelayMs(5); }/*------------------------------------------------      写入字符串函数------------------------------------------------*/ void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)  {      if (y == 0)  {      LCD_Write_Com(0x80 + x);     //表示第一行 } else  {       LCD_Write_Com(0xC0 + x);      //表示第二行 }         while (*s)  {      LCD_Write_Data( *s);      s ++;      } }/*------------------------------------------------        写入字符函数------------------------------------------------*//* void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)  {      if (y == 0)  {      LCD_Write_Com(0x80 + x);      }     else  {      LCD_Write_Com(0xC0 + x);      }         LCD_Write_Data( Data);   }*//*------------------------------------------------        初始化函数------------------------------------------------*/ void LCD_Init(void)  {   LCD_Write_Com(0x38);    /*显示模式设置*/    DelayMs(5);    LCD_Write_Com(0x38);    DelayMs(5);    LCD_Write_Com(0x38);    DelayMs(5);    LCD_Write_Com(0x38);     LCD_Write_Com(0x08);    /*显示关闭*/    LCD_Write_Com(0x01);    /*显示清屏*/    LCD_Write_Com(0x06);    /*显示光标移动设置*/    DelayMs(5);    LCD_Write_Com(0x0C);    /*Ï显示开关及光标设置*/   }