C51 COMPILER V7.06   ADC0804                                                               11/19/2006 14:52:52 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE ADC0804
OBJECT MODULE PLACED IN adc0804.OBJ
COMPILER INVOKED BY: E:\Program Files\C51\BIN\C51.EXE adc0804.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          /*****************************************************************/ 
   2          /*                                                               */                                       
             -                         
   3          /*名稱：                 AD轉(zhuǎn)換+顯示程序                         */                                       
             -                                                                                                                        
             -            
   4          /*功能：           讀取當(dāng)前輸入的轉(zhuǎn)換電壓，由數(shù)碼管顯示出來。    */                                       
             -             
   5          /*難度等級(jí)：                   中                                */                                       
             -                              
   6          /* 作者：                  zengrenliang                          */
   7          /* 版權(quán)：           http://www.51kaifa.com                       */
   8          /*編寫日期：        2006.05.19                                   */                                       
             -                                                                                                                        
             -                                              
   9          /*****************************************************************/
  10          
  11          
  12          #include<reg52.h>
  13          #define  uchar  unsigned char
  14          
  15          sbit addr0 = P1^4;//系統(tǒng)片選地址線0
  16          sbit addr1 = P1^5;//系統(tǒng)片選地址線1
  17          sbit addr2 = P1^6;//系統(tǒng)片選地址線2
  18          sbit addr3 = P1^7;//系統(tǒng)片選地址線3
  19          sbit led = P1^0;
  20          //行掃描數(shù)組
  21          uchar code scan[8] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//row0--row7
  22          //數(shù)碼管顯示的段碼表
  23          uchar code table[18] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,//0,1,2,3,4,5
  24                                 0x82,0xf8,0x80,0x90,0x88,0x83,//6,7,8,9,a,b
  25                                 0xc6,0xa1,0x86,0x8e,0xbf,0xff};//c,d,e,f,-,空格
  26          
  27          uchar dispbuf[8]; //顯示緩沖區(qū)                         
  28          
  29          /*****************************延時(shí)函數(shù)**************************/
  30          
  31          void delay (unsigned int us)  
  32          {
  33   1        while(us--);
  34   1      }
  35          
  36          /******************************顯示+讀鍵*************************/
  37          
  38          void ledscan()
  39          {  unsigned char i,dispcode;  
  40   1      
  41   1          for(i=0;i<8;i++){
  42   2             addr3 = 0;
  43   2             addr0 = 0;
  44   2             addr1 = 1;
  45   2             addr2 = 0;//開發(fā)板上U4（74HC574）的片選地址
  46   2             dispcode =table[dispbuf[i]]; //取一行顯示數(shù)據(jù)
  47   2             if(i==3)
  48   2              P0 = dispcode & 0x7f; 
C51 COMPILER V7.06   ADC0804                                                               11/19/2006 14:52:52 PAGE 2   

  49   2             else 
  50   2              P0 = dispcode;
  51   2             addr3 = 1; 
  52   2             addr3 = 0;//在U4的11腳（鎖存信號(hào)）產(chǎn)生上升沿
  53   2             P2 = scan[i];//取row0--row7行掃描數(shù)據(jù)
  54   2             delay(50); //延時(shí)50us
  55   2             }
  56   1       }
  57          
  58          
  59          /*******************0804轉(zhuǎn)換程序********************/
  60          void  ADC0804(void)
  61          {  uchar adc0804value;
  62   1         float voltage,decimal;
  63   1         unsigned int intvolt,tofloat;
  64   1         led = ~led;
  65   1         addr0 = 1;
  66   1         addr1 = 1;
  67   1         addr2 = 0;//輸出AD0804片選地址。
  68   1         addr3 = 1;
  69   1         P0 = 0xff;//向ADC0804發(fā)任何數(shù)據(jù)，0804開始轉(zhuǎn)換
  70   1         WR = 0;
  71   1         WR = 1;
  72   1         addr3 = 0;
  73   1         delay(100);//等待轉(zhuǎn)換完成
  74   1         addr3 = 1;
  75   1         RD = 0;
  76   1         adc0804value=P0;//讀取轉(zhuǎn)換后的值
  77   1         RD = 1;
  78   1         addr3 = 0;
  79   1         voltage = adc0804value;
  80   1         voltage = voltage * 0.0391;//將二進(jìn)制字節(jié)數(shù)據(jù)變成實(shí)際電壓值   10/256 = 0.0196
  81   1         intvolt = voltage;//取整數(shù)部分
  82   1         tofloat = intvolt; 
  83   1         decimal = voltage - tofloat;//取小數(shù)部分
  84   1         decimal = decimal * 100;//小數(shù)部分取兩位
  85   1         dispbuf[3] = intvolt % 0x0a;//整數(shù)部分個(gè)位
  86   1         intvolt = decimal;
  87   1         dispbuf[5] = intvolt % 0x0a;//小數(shù)部分低位
  88   1         intvolt = intvolt / 0x0a;
  89   1         dispbuf[4] = intvolt % 0x0a;//小數(shù)部分高位 
  90   1      }
  91          
  92          
  93          /*******************************主函數(shù)***********************/
  94          
  95          main()
  96          { uchar i;   
  97   1        for(i=0;i<8;i++)
  98   1         dispbuf[i] = 17;
  99   1        while(1){
 100   2         for(i=0;i<10;i++)
 101   2           ledscan(); //顯示，讀鍵掃描 
 102   2         ADC0804();
 103   2        }
 104   1      }
 105          
 106          /********************************結(jié)束************************/


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    293    ----
C51 COMPILER V7.06   ADC0804                                                               11/19/2006 14:52:52 PAGE 3   

   CONSTANT SIZE    =     26    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      8      11
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)