pca9554.lst

i2c总线的程序设计

C51 COMPILER V8.02   PCA9554                                                               11/07/2006 09:12:55 PAGE 1   


C51 COMPILER V8.02, COMPILATION OF MODULE PCA9554
OBJECT MODULE PLACED IN pca9554.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE pca9554.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include "i2c.h"
   2          #include <reg51.h>
   3          #include <intrins.h>
   4          #include "common.h"
   5          
   6          #define WriteDeviceAddress_9554 0x40
   7          #define ReadDeviceAddress_9554 0x41
   8          sbit PCA9554_SCL=P3^0;
   9          sbit PCA9554_SDA=P3^1;
  10          
  11          void start_9554(void)
  12          {
  13   1              PCA9554_SCL=0;
  14   1              PCA9554_SDA=1;
  15   1              nop();
  16   1              nop();
  17   1              nop();
  18   1              nop();
  19   1              nop();
  20   1              nop();
  21   1      
  22   1              PCA9554_SCL=1;
  23   1              nop();
  24   1              nop();
  25   1              nop();
  26   1              nop();
  27   1              nop();
  28   1      
  29   1              PCA9554_SDA=0;
  30   1              nop();
  31   1              nop();
  32   1              nop();
  33   1              nop();
  34   1              nop();
  35   1      }
  36          
  37          void stop_9554()
  38          {
  39   1              PCA9554_SCL=0;
  40   1              PCA9554_SDA=0;
  41   1                      nop();
  42   1              nop();
  43   1              nop();
  44   1              nop();
  45   1              nop();
  46   1      
  47   1              PCA9554_SCL=1;
  48   1              nop();
  49   1              nop();
  50   1              nop();
  51   1              nop();
  52   1              nop();
  53   1              //nop();
  54   1              //nop();
  55   1              //nop();
C51 COMPILER V8.02   PCA9554                                                               11/07/2006 09:12:55 PAGE 2   

  56   1              //nop();
  57   1              
  58   1              PCA9554_SDA=1;
  59   1              nop();
  60   1              nop();
  61   1              nop();  
  62   1              nop();
  63   1              nop();
  64   1      }       
  65          
  66          
  67          void writeoutput(uchar input)
  68          {
  69   1              start_9554();
  70   1              write8bit(WriteDeviceAddress_9554);
  71   1              write8bit(0x1);
  72   1              write8bit(input);
  73   1              stop_9554();
  74   1      }
  75          
  76          void writeconfig(uchar input)
  77          {
  78   1              start_9554();
  79   1              write8bit(WriteDeviceAddress_9554);
  80   1              write8bit(0x3);
  81   1              write8bit(input);
  82   1              stop_9554();
  83   1      }
  84          
  85          uchar readregister(void)
  86          {
  87   1              uchar readdata;
  88   1              start_9554();
  89   1              write8bit(WriteDeviceAddress_9554);
  90   1              write8bit(0x1);
  91   1              start_9554();
  92   1              write8bit(ReadDeviceAddress_9554);
  93   1              readdata=read8bit();
  94   1              no_ack();
  95   1              stop_9554();
  96   1              return readdata;
  97   1      }
  98          
  99          
 100          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    130    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       3
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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