at24c02driver.lst

本代码是关于AT24C02串行存储器的读写的

C51 COMPILER V8.01   AT24C02DRIVER                                                         03/08/2006 20:08:08 PAGE 1   


C51 COMPILER V8.01, COMPILATION OF MODULE AT24C02DRIVER
OBJECT MODULE PLACED IN AT24C02Driver.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE AT24C02Driver.c BROWSE DEBUG OBJECTEXTEND TABS(2)

line level    source

   1          #include <REGX51.H>
   2          #include <INTRINS.H>
   3          #include "AT24C02Driver.h"
   4          
   5          
   6          void delay(void);
   7          void i_start(void);
   8          void i_stop(void);
   9          bit i_clock(void);
  10          bit i_send(unsigned char i_data);
  11          unsigned char i_receive(void);
  12          
  13          void delay(void)
  14          {
  15   1        _nop_();
  16   1        _nop_();
  17   1        _nop_();
  18   1        _nop_();
  19   1        _nop_();
  20   1        _nop_();
  21   1      }
  22          
  23          void i_start(void)
  24          {
  25   1        SCL_1;
  26   1        delay();
  27   1        SDA_0;
  28   1        delay();
  29   1        SCL_0;
  30   1        delay();
  31   1      }
  32          
  33          void i_stop(void)
  34          {
  35   1        SDA_0;
  36   1        delay();
  37   1        SCL_1;
  38   1        delay();
  39   1        SDA_1;
  40   1        delay();
  41   1        SCL_0;
  42   1        delay();
  43   1      }
  44          
  45          bit i_clock(void)
  46          {
  47   1        bit sample;
  48   1      
  49   1        SCL_1;
  50   1        delay();
  51   1        sample=SDA;
  52   1        _nop_();
  53   1        _nop_();
  54   1        SCL_0;
  55   1        delay();
C51 COMPILER V8.01   AT24C02DRIVER                                                         03/08/2006 20:08:08 PAGE 2   

  56   1        return(sample);
  57   1      }
  58          
  59          
  60          bit i_send(unsigned char i_data)
  61          {
  62   1        unsigned char i;
  63   1      
  64   1        for(i=8;i>0;i--)
  65   1          {
  66   2            SDA=(bit)(i_data & 0x80);
  67   2            i_data=i_data<<1;
  68   2            i_clock();
  69   2          }
  70   1        SDA_1;
  71   1        return(~i_clock());
  72   1      }
  73          
  74          unsigned char i_receive(void)
  75          {
  76   1        unsigned char i_data=0;
  77   1        unsigned char i;
  78   1      
  79   1        for(i=8;i>0;i--)
  80   1          {
  81   2            i_data*=2;
  82   2            if(i_clock()) i_data++;
  83   2          }
  84   1        return(i_data);
  85   1      }
  86          
  87          
  88          
  89          unsigned char at24c02byteread(unsigned char address)
  90          {
  91   1        unsigned char  retdata;
  92   1      
  93   1        i_start();
  94   1        if(i_send(0xa0))
  95   1          {
  96   2            if(i_send(address))
  97   2              {
  98   3                i_start();
  99   3                if(i_send(0xa1))
 100   3                  {
 101   4                    retdata=i_receive();
 102   4                    i_stop();
 103   4                    delay();
 104   4                    return(retdata);
 105   4                  }
 106   3              }
 107   2          }
 108   1      }
 109          
 110          
 111          void at24c02bytewrite(unsigned char address,unsigned char writedata)
 112          {
 113   1        i_start();
 114   1        if(i_send(0xa0))
 115   1          {
 116   2            if(i_send(address))
 117   2              {
C51 COMPILER V8.01   AT24C02DRIVER                                                         03/08/2006 20:08:08 PAGE 3   

 118   3                if(i_send(writedata))
 119   3                  {
 120   4                    i_stop();
 121   4                    delay();
 122   4                  }
 123   3              }
 124   2          }
 125   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    172    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----       1
END OF MODULE INFORMATION.


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