單片機多點溫度采集系統LCD1602+仿真+程序

ID:392145 · 發表于 2018-11-2 22:24

多點溫度采集系統，仿真+程序 LCD自動切換顯示多點溫度

仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）

#include <AT89X52.h>
#include <Intrins.h>

#define             DATA       P1    //1602驅動端口
//ROM操作命令
#define                READ_ROM                      0x33                   //讀ROM
#define                SKIP_ROM                      0xCC                   //跳過ROM
#define                MATCH_ROM             0x55                   //匹配ROM
#define                SEARCH_ROM             0xF0                   //搜索ROM
#define                ALARM_SEARCH          0xEC                   //告警搜索

//存儲器操作命令
#define                ANEW_MOVE                   0xB8                   //重新調出E^2數據
#define                READ_POWER             0xB4                   //讀電源
#define                TEMP_SWITCH          0x44                   //啟動溫度變換
#define                READ_MEMORY          0xBE                   //讀暫存存儲器
#define                COPY_MEMORY          0x48                   //復制暫存存儲器
#define                WRITE_MEMORY          0x4E                   //寫暫存存儲器

//數據存儲結構
typedef struct tagTempData
{
      unsigned char                                        btThird;                                                       //百位數據
      unsigned char                                        btSecond;                                                       //十位數據
      unsigned char                                        btFirst;                                                       //個位數據
      unsigned char                                        btDecimal;                                                       //小數點后一位數據
      unsigned char                                     btNegative;                                                       //是否為負數
}TEMPDATA;
TEMPDATA m_TempData;

//引腳定義
sbit                                                       DQ = P2^7;                                                       //數據線端口
sbit                RS=             P2^0;
sbit                RW=             P2^1;
sbit                E=             P2^2;

//DS18B20序列號,通過調用GetROMSequence()函數在P1口讀出(讀8次)
const unsigned char code ROMData1[8] = {0x28, 0x33, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xD7};       //U1
const unsigned char code ROMData2[8] = {0x28, 0x30, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x8E};       //U2
const unsigned char code ROMData3[8] = {0x28, 0x31, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xB9};       //U3
const unsigned char code ROMData4[8] = {0x28, 0x32, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xE0};       //U4
const unsigned char code ROMData5[8] = {0x28, 0x34, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x52};       //U5
const unsigned char code ROMData6[8] = {0x28, 0x35, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x65};       //U6
const unsigned char code ROMData7[8] = {0x28, 0x36, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x3C};       //U7
const unsigned char code ROMData8[8] = {0x28, 0x37, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x0B};       //U8

//判斷忙指令
void Busy()
{
      DATA = 0xff;
      RS = 0;
      RW = 1;
         while(DATA & 0x80)
         {
            E = 0;
               E = 1;
         }
         E = 0;
}

//寫指令程序
void WriteCommand(unsigned char btCommand)
{
      Busy();
      RS = 0;
      RW = 0;
      E = 1;
      DATA = btCommand;
      E = 0;
}

//寫數據程序
void WriteData(unsigned char btData)
{
      Busy();
      RS = 1;
      RW = 0;
      E = 1;
      DATA = btData;
      E = 0;
}

//清屏顯示
void Clear()
{
      WriteCommand(1);
}

//初始化
void Init()
{
      WriteCommand(0x0c);       //開顯示,無光標顯示
      WriteCommand(0x06);       //文字不動，光標自動右移
      WriteCommand(0x38);       //設置顯示模式:8位2行5x7點陣
}

//顯示單個字符
void DisplayOne(bit bRow, unsigned char btColumn, unsigned char btData, bit bIsNumber)
{
      if (bRow)                WriteCommand(0xc0 + btColumn);
      else                   WriteCommand(0x80 + btColumn);

      if (bIsNumber)       WriteData(btData + 0x30);
      else                WriteData(btData);
}

//顯示字符串函數
void DisplayString(bit bRow, unsigned char btColumn, unsigned char *pData)
{
      while (*pData != '\0')
         {
               if (bRow) WriteCommand(0xc0 + btColumn);       //顯示在第1行
               else          WriteCommand(0x80 + btColumn);       //顯示在第0行
            WriteData(*(pData++));                                              //要顯示的數據
            btColumn++;                                                                      //列數加一
         }
}

//延時16us子函數
void Delay16us()
{
      unsigned char a;

      for (a = 0; a < 4; a++);
}

//延時60us子函數
void Delay60us()
{
      unsigned char a;

      for (a = 0; a < 18; a++);
}

//延時480us子函數
void Delay480us()
{
      unsigned char a;

      for (a = 0; a < 158; a++);
}

//延時240us子函數
void Delay240us()
{
      unsigned char a;

      for (a = 0; a < 78; a++);
}

//延時500ms子函數
void Delay500ms()
{
      unsigned char a, b, c;

      for (a = 0; a < 250; a++)
      for (b = 0; b < 3; b++)
      for (c = 0; c < 220; c++);
}

//芯片初始化
void Initialization()
{
      while(1)
      {
            DQ = 0;
            Delay480us();                      //延時480us
            DQ = 1;
            Delay60us();                      //延時60us
            if(!DQ)                               //收到ds18b20的應答信號
            {
                     DQ = 1;
                     Delay240us();             //延時240us
                     break;
            }
      }
}

//寫一個字節(從低位開始寫)
void WriteByte(unsigned char btData)
{
      unsigned char i, btBuffer;

      for (i = 0; i < 8; i++)
      {
            btBuffer = btData >> i;
            if (btBuffer & 1)
            {
                     DQ = 0;
                     _nop_();
                     _nop_();
                     DQ = 1;
                     Delay60us();
            }
            else
            {
                     DQ = 0;
                     Delay60us();
                     DQ = 1;
            }
      }
}

//讀一個字節(從低位開始讀)
unsigned char ReadByte()
{
      unsigned char i, btDest;

      for (i = 0; i < 8; i++)
      {
            btDest >>= 1;
            DQ = 0;
            _nop_();
            _nop_();
            DQ = 1;
            Delay16us();
            if (DQ) btDest |= 0x80;
            Delay60us();
      }

      return btDest;
}

//序列號匹配
void MatchROM(const unsigned char *pMatchData)
{
      unsigned char i;

      Initialization();
      WriteByte(MATCH_ROM);
      for (i = 0; i < 8; i++) WriteByte(*(pMatchData + i));
}

//得到64位ROM序列(在P1口顯示,必須與Proteus聯調且在單步調試下才能得到)
/*void GetROMSequence()
{
      unsigned char i;

      Initialization();
      WriteByte(READ_ROM);
      for (i = 0; i < 8; i++)
      P1 = ReadByte();
}*/

//讀取溫度值
TEMPDATA ReadTemperature()
{
      TEMPDATA TempData;
      unsigned int iTempDataH;
      unsigned char btDot, iTempDataL;
      static unsigned char i = 0;

      TempData.btNegative = 0;                                              //為0溫度為正
      i++;
      if (i == 9) i = 1;
      Initialization();
      WriteByte(SKIP_ROM);                                                       //跳過ROM匹配
      WriteByte(TEMP_SWITCH);                                                       //啟動轉換
      Delay500ms();                                                                         //調用一次就行
      Delay500ms();
      Initialization();

      //多個芯片的時候用MatchROM(ROMData)換掉WriteByte(SKIP_ROM)
      switch (i)
      {
            case 1 : MatchROM(ROMData1); break;                      //匹配1
            case 2 : MatchROM(ROMData2); break;                      //匹配2
            case 3 : MatchROM(ROMData3); break;                      //匹配3
            case 4 : MatchROM(ROMData4); break;                      //匹配4
            case 5 : MatchROM(ROMData5); break;                      //匹配5
            case 6 : MatchROM(ROMData6); break;                      //匹配6
            case 7 : MatchROM(ROMData7); break;                      //匹配7
            case 8 : MatchROM(ROMData8); break;                      //匹配8
      }
      //WriteByte(SKIP_ROM);                                                       //跳過ROM匹配(單個芯片時用這句換掉上面的switch)
      WriteByte(READ_MEMORY);                                                       //讀數據
      iTempDataL = ReadByte();
      iTempDataH = ReadByte();
      iTempDataH <<= 8;
      iTempDataH |= iTempDataL;

      if (iTempDataH & 0x8000)
      {
            TempData.btNegative = 1;
            iTempDataH = ~iTempDataH + 1;                               //負數求補
      }

      //為了省去浮點運算帶來的開銷，而采用整數和小數部分分開處理的方法(沒有四舍五入)
      btDot = (unsigned char)(iTempDataH & 0x000F);       //得到小數部分
      iTempDataH >>= 4;                                                             //得到整數部分
      btDot *= 5;                                                                      //btDot*10/16得到轉換后的小數數據
      btDot >>= 3;

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多點溫度采集系統LCD1602 仿真程序.rar (75.72 KB, 下載次數: 217)