10.1.lst

DVP：Keil C51 7.0以上版本 CPU：AT89C51 FUNC：I2C应用之一

C51 COMPILER V7.09   10_1                                                                  08/24/2005 10:28:55 PAGE 1   


C51 COMPILER V7.09, COMPILATION OF MODULE 10_1
OBJECT MODULE PLACED IN 10.1.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE 10.1.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include <reg51.h>
   2          
   3          //P1.2  SCL
   4          //P1.3  SDA
   5          sbit SDA=P1^3;              //SDA
   6          sbit SCL=P1^2;              //SCL
   7          
   8          //#define DIR_IN      P3DIR &=~ BIT3;  SDA_1      //I/O口为输入
   9          //#define DIR_OUT     P3DIR |=  BIT3              //I/0口为输出
  10          //#define SDA_IN      ((P3IN >> 3) & 0x01)        //Read SDA
  11          
  12          unsigned  char SystemError;
  13          unsigned char errtime;
  14          int i;
  15          void SomeNOP();
  16          void main()
  17          
  18          {
  19   1      EA=0;
  20   1      SDA=0; 
  21   1      SCL=1; 
  22   1      SomeNOP();                    //初始化
  23   1      SDA=0; 
  24   1      SomeNOP();                    //开始
  25   1      SCL=0;
  26   1      
  27   1      
  28   1      
  29   1      SCL=0; SDA=0; SomeNOP();       //开始
  30   1      SCL=1; SomeNOP(); SDA=1;       //停止
  31   1      EA=1;
  32   1      
  33   1      
  34   1      
  35   1      
  36   1      errtime=255;            //因故障接收方无ACK，超时值为255。
  37   1      SDA=1;
  38   1      SCL=1;
  39   1      
  40   1      
  41   1      while(1) 
  42   1      {
  43   2      errtime--; 
  44   2      } 
  45   1      SCL=0;
  46   1      
  47   1      
  48   1      
  49   1      
  50   1        //写数据
  51   1      
  52   1       SDA=1; 
  53   1      SomeNOP();
  54   1       SCL=1;
  55   1       SomeNOP();
C51 COMPILER V7.09   10_1                                                                  08/24/2005 10:28:55 PAGE 2   

  56   1       SCL=0;
  57   1       
  58   1      
  59   1       
  60   1       i=8;
  61   1       while (i--)
  62   1       {
  63   2       SCL=0;
  64   2      SomeNOP();
  65   2        
  66   2       
  67   2      SomeNOP();
  68   2      SCL=1; 
  69   2      SomeNOP();
  70   2       }
  71   1      SCL=0;
  72   1       }
  73          
  74          void SomeNOP()
  75          {
  76   1      for(i=0;i<255;i++)
  77   1      {
  78   2      }
  79   1      }
  80          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     62    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      4    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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