rs485.lst

早期用过的一个485通信程序

C51 COMPILER V7.10   RS485                                                                 11/18/2006 21:15:26 PAGE 1   


C51 COMPILER V7.10, COMPILATION OF MODULE RS485
OBJECT MODULE PLACED IN RS485.OBJ
COMPILER INVOKED BY: d:\Program Files\Keil\C51\BIN\C51.EXE RS485.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*********************************************************************************************************
   2          **
   3          **                                  (c) Copyright 2004-2006
   4          **                                    All Rights Reserved
   5          **
   6          **
   7          **                                    版权所有：朗顿科技
   8          **                                   http://www.ldmcu.com
   9          **
  10          ********************************************************************************************************/
  11          
  12          #include <REG52.H>                /* special function register declarations   */
  13                                            /* for the intended 8051 derivative         */
  14          
  15          #include <stdio.h>                /* prototype declarations for I/O functions */
  16          
  17          bit senenb = 0;
  18          int i_aT,i_bT;
  19          unsigned char Tem;
  20          
  21          sbit rs485_com = P3^2;
  22          /*------------------------------------------------
  23          The main C function.  Program execution starts
  24          here after stack initialization.
  25          ------------------------------------------------*/
  26          void delay(unsigned char i);
  27          
  28          void ser_int (void) interrupt 4 using 1
  29          {
  30   1       if(TI == 1)
  31   1       {
  32   2              TI = 0;
  33   2              senenb = 0;
  34   2       }
  35   1      
  36   1       if(RI == 1)
  37   1       {
  38   2              RI = 0;
  39   2              Tem = SBUF;
  40   2              senenb = 1;
  41   2      
  42   2       }
  43   1      }
  44          void main (void) {
  45   1      
  46   1      /*------------------------------------------------
  47   1      Setup the serial port for 9600 baud at 11.0592MHz.
  48   1      ------------------------------------------------*/
  49   1      #ifndef MONITOR51
  50   1          SCON  = 0x50;                       /* SCON: mode 1, 8-bit UART, enable rcvr      */
  51   1          TMOD |= 0x20;               /* TMOD: timer 1, mode 2, 8-bit reload        */
  52   1          TH1   = 0xfd;               /* TH1:  reload value for 9600 baud at 11.0592MHz   */
  53   1          TR1   = 1;                  /* TR1:  timer 1 run                          */
  54   1              IE    = 0x90;                           /* IE:  enable UART interrupter               */
  55   1      #endif
C51 COMPILER V7.10   RS485                                                                 11/18/2006 21:15:26 PAGE 2   

  56   1      
  57   1      /*------------------------------------------------
  58   1      Note that an embedded program never exits (because
  59   1      there is no operating system to return to).  It
  60   1      must loop and execute forever.
  61   1      ------------------------------------------------*/
  62   1        rs485_com = 0;
  63   1        
  64   1        while(1)
  65   1        {     
  66   2              if(senenb == 1)
  67   2              {
  68   3                rs485_com = 1;
  69   3                SBUF = Tem;
  70   3                delay(100);
  71   3              }
  72   2              else
  73   2              {
  74   3                rs485_com = 0;
  75   3              }
  76   2        }
  77   1      }
  78          
  79          void delay(unsigned char i)
  80          {
  81   1              unsigned char j;
  82   1              for(i; i > 0; i--)
  83   1                      for(j = 200; j > 0; j--);
  84   1      }
  85          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     67    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      5    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
END OF MODULE INFORMATION.


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