i2c.lst

8051 SPI_93c46 c语言程序

C51 COMPILER V7.06   I2C                                                                   10/03/2006 10:29:04 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE I2C
OBJECT MODULE PLACED IN I2C.OBJ
COMPILER INVOKED BY: E:\Program Files\C51\BIN\C51.EXE I2C.C BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include <reg52.h>
   2          #include <intrins.h>
   3          #define uchar unsigned char
   4          #define uint unsigned int
   5          sbit SCL=P1^1;
   6          sbit SDA=P1^3;
   7          
   8          void  delay(unsigned int loop) //延时函数
   9          {  unsigned int i ;          //loop 为执行空指令的次数,改变它可一改变延时时长
  10   1        for(i=0;i<loop;i++);//循环执行空指令loop次,达到延时目的
  11   1       }
  12          
  13          
  14            /***********开始**************/
  15          void Start_I2c()
  16          {
  17   1          SDA=1;
  18   1          delay(1);
  19   1          SCL=1;
  20   1          delay(3);
  21   1          SDA=0;
  22   1          delay(3);
  23   1          SCL=0;
  24   1          delay(1);
  25   1      }
  26          
  27          
  28          
  29          /************结束*************/
  30          void Stop_I2c()
  31          { 
  32   1          SDA=0;
  33   1          delay(1);
  34   1          SCL=1;
  35   1          delay(3);
  36   1          SDA=1;
  37   1          delay(1);
  38   1      
  39   1      }
  40          
  41          
  42          /***********SendB**************/
  43          void SendB(uchar c)
  44          {
  45   1          uchar BitCnt,ack;
  46   1          for(BitCnt=0;BitCnt<8;BitCnt++)
  47   1          {
  48   2            if((c<<BitCnt)&0x80)SDA=1;
  49   2            else SDA=0;
  50   2            delay(2);
  51   2            SCL=1;
  52   2            delay(5);
  53   2            SCL=0;
  54   2            delay(2);
  55   2      
C51 COMPILER V7.06   I2C                                                                   10/03/2006 10:29:04 PAGE 2   

  56   2          }
  57   1            delay(1);
  58   1            SDA=1;
  59   1            delay(5);  
  60   1            SCL=1;
  61   1            delay(1);
  62   1            if(SDA==1)ack=0;
  63   1            else ack=1;
  64   1            SCL=0;
  65   1            delay(1);
  66   1      
  67   1      }
  68          
  69          /*************RcvB****************/   
  70          uchar RcvB()
  71          {
  72   1           uchar retc;
  73   1           uchar BitCnt;
  74   1           retc=0;
  75   1           SDA=1;
  76   1           for(BitCnt=0;BitCnt<8;BitCnt++)
  77   1           {
  78   2              delay(1);
  79   2              SCL=0;
  80   2              delay(5);
  81   2              SCL=1;
  82   2              delay(2);
  83   2              retc=retc<<1;
  84   2              if(SDA==1)retc=retc+1;
  85   2              delay(1);
  86   2           }
  87   1           SCL=0;
  88   1              delay(1);  
  89   1           return(retc);
  90   1      }
  91          
  92          /************应答****************/  
  93          void Ack_I2c(bit a)
  94          {
  95   1          if(a==0)SDA=0;
  96   1          else SDA=1;
  97   1              delay(1);
  98   1          SCL=1;    
  99   1              delay(2);
 100   1          SCL=0;
 101   1              delay(1);
 102   1       
 103   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    217    ----
   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)