pc_io_t1.lst

Embedded C 这本书的范例光碟程式

C51 COMPILER V7.07   PC_IO_T1                                                              06/12/2006 21:12:15 PAGE 1   


C51 COMPILER V7.07, 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) BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          /*------------------------------------------------------------------*-
   2             PC_IO_T1.C (v1.00)
   3             PC link library. Bidirectional. T1 used for baud rate generation.
   4             Uses the UART, and Pins 3.1 (Tx) and 3.0 (Rx) 
   5          -*------------------------------------------------------------------*/
   6          
   7          #include "Main.h"
   8          #include "PC_IO_T1.h"
   9          extern tByte In_read_index_G;     
  10          extern tByte In_waiting_index_G;  
  11          extern tByte Out_written_index_G;  
  12          extern tByte Out_waiting_index_G;  
  13          
  14          /*  This (generic) version uses T1 for baud rate generation. */
  15          
  16          void PC_LINK_IO_Init_T1(const tWord BAUD_RATE)
  17          {
  18   1         PCON &= 0x7F;   // Set SMOD bit to 0 (don't double baud rates)
  19   1         //  Receiver enabled.
  20   1         //  8-bit data, 1 start bit, 1 stop bit, 
  21   1         //  Variable baud rate (asynchronous)
  22   1         //  Receive flag will only be set if a valid stop bit is received
  23   1         //  Set TI (transmit buffer is empty)
  24   1         SCON = 0x72;
  25   1         TMOD |= 0x20;   // T1 in mode 2, 8-bit auto reload
  26   1         TH1 = (256 - (tByte)((((tLong)OSC_FREQ / 100) * 3125) 
  27   1                  / ((tLong) BAUD_RATE * OSC_PER_INST * 1000)));
  28   1         TL1 = TH1;  
  29   1         TR1 = 1;  // Run the timer
  30   1         TI = 1;   // Send first character (dummy)
  31   1      
  32   1         // Set up the buffers for reading and writing
  33   1         In_read_index_G = 0;
  34   1         In_waiting_index_G = 0;
  35   1         Out_written_index_G = 0;
  36   1         Out_waiting_index_G = 0;
  37   1         // Interrupt *NOT* enabled
  38   1         ES = 0;
  39   1      }
  40          
  41          
  42          
  43          
  44          


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

C51 COMPILER V7.07   PC_IO_T1                                                              06/12/2006 21:12:15 PAGE 2   


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