pc_io_t1.lst

Embedded C 这本书的范例光碟程式

C51 COMPILER V6.21  PC_IO_T1                                                               01/23/2002 18:09:30 PAGE 1   


C51 COMPILER V6.21, COMPILATION OF MODULE PC_IO_T1
OBJECT MODULE PLACED IN PC_IO_T1.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE PC_IO_T1.c OPTIMIZE(6,SIZE) DEBUG OBJECTEXTEND

stmt level    source

   1          /*------------------------------------------------------------------*-
   2          
   3             PC_IO_T1.C (v1.00)
   4          
   5            ------------------------------------------------------------------
   6          
   7             PC link library. Bidirectional. T1 used for baud rate generation.
   8          
   9             Uses the UART, and Pins 3.1 (Tx) and 3.0 (Rx) 
  10          
  11             See text for details (Chapter 9).
  12          
  13             COPYRIGHT
  14             ---------
  15          
  16             This code is associated with the book:
  17          
  18             EMBEDDED C by Michael J. Pont 
  19             [Pearson Education, 2002: ISBN: 0-201-79523-X].
  20          
  21             This code is copyright (c) 2001 by Michael J. Pont.
  22           
  23             See book for copyright details and other information.
  24          
  25          -*------------------------------------------------------------------*/
  26          
  27          #include "Main.h"
  28          #include "PC_IO_T1.h"
  29          
  30          // ------ Public variable declarations -----------------------------
  31          
  32          extern tByte In_read_index_G;     
  33          extern tByte In_waiting_index_G;  
  34          
  35          extern tByte Out_written_index_G;  
  36          extern tByte Out_waiting_index_G;  
  37          
  38          /*------------------------------------------------------------------*-
  39          
  40            PC_LINK_IO_Init_T1()
  41          
  42            This (generic) version uses T1 for baud rate generation.
  43          
  44          -*------------------------------------------------------------------*/
  45          void PC_LINK_IO_Init_T1(const tWord BAUD_RATE)
  46             {
  47   1         PCON &= 0x7F;   // Set SMOD bit to 0 (don't double baud rates)
  48   1      
  49   1         //  Receiver enabled.
  50   1         //  8-bit data, 1 start bit, 1 stop bit, 
  51   1         //  Variable baud rate (asynchronous)
  52   1         //  Receive flag will only be set if a valid stop bit is received
  53   1         //  Set TI (transmit buffer is empty)
  54   1         SCON = 0x72;
  55   1      
C51 COMPILER V6.21  PC_IO_T1                                                               01/23/2002 18:09:30 PAGE 2   

  56   1         TMOD |= 0x20;   // T1 in mode 2, 8-bit auto reload
  57   1      
  58   1         TH1 = (256 - (tByte)((((tLong)OSC_FREQ / 100) * 3125) 
  59   1                  / ((tLong) BAUD_RATE * OSC_PER_INST * 1000)));
  60   1      
  61   1         TL1 = TH1;  
  62   1         TR1 = 1;  // Run the timer
  63   1         TI = 1;   // Send first character (dummy)
  64   1      
  65   1         // Set up the buffers for reading and writing
  66   1         In_read_index_G = 0;
  67   1         In_waiting_index_G = 0;
  68   1         Out_written_index_G = 0;
  69   1         Out_waiting_index_G = 0;
  70   1      
  71   1         // Interrupt *NOT* enabled
  72   1         ES = 0;
  73   1         }
  74          
  75          /*------------------------------------------------------------------*-
  76            ---- END OF FILE -------------------------------------------------
  77          -*------------------------------------------------------------------*/
  78          
  79          
  80          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     64    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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