C51 COMPILER V6.21  SIMPLE_EOS                                                             01/23/2002 18:05:24 PAGE 1   


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

stmt level    source

   1          /*------------------------------------------------------------------*-
   2          
   3             Simple_EOS.C (v1.00)
   4          
   5            ------------------------------------------------------------------
   6          
   7             Main file for Simple Embedded Operating System (sEOS) for 8051. 
   8          
   9             - This version for project DATA_ACQ (Chapter 9).
  10          
  11             COPYRIGHT
  12             ---------
  13          
  14             This code is associated with the book:
  15          
  16             EMBEDDED C by Michael J. Pont 
  17             [Pearson Education, 2002: ISBN: 0-201-79523-X].
  18          
  19             This code is copyright (c) 2001 by Michael J. Pont.
  20           
  21             See book for copyright details and other information.
  22          
  23          -*------------------------------------------------------------------*/
  24          
  25          #include "Main.H"
  26          #include "Simple_EOS.H"
  27          
  28          #include "Menu_Data.H"
  29          
  30          /*------------------------------------------------------------------*-
  31            
  32            sEOS_ISR()
  33          
  34            Invoked periodically by Timer 2 overflow: 
  35            see sEOS_Init_Timer2() for timing details.
  36          
  37          -*------------------------------------------------------------------*/
  38          void sEOS_ISR() interrupt INTERRUPT_Timer_2_Overflow
  39             {
  40   1         TF2 = 0;  // Must manually reset the T2 flag   
  41   1      
  42   1         //===== USER CODE - Begin =======================================
  43   1         // Call MENU_Command_Processor every 5ms
  44   1         MENU_Command_Processor();
  45   1      
  46   1         //===== USER CODE - End =========================================
  47   1         }
  48          
  49          /*------------------------------------------------------------------*-
  50            
  51            sEOS_Init_Timer2()
  52          
  53            Sets up Timer 2 to drive the simple EOS.
  54          
  55            Parameter gives tick interval in MILLISECONDS.
C51 COMPILER V6.21  SIMPLE_EOS                                                             01/23/2002 18:05:24 PAGE 2   

  56          
  57            Max tick interval is ~60ms (12 MHz oscillator).
  58          
  59            Note: Precise tick intervals are only possible with certain 
  60            oscillator / tick interval combinations.  If timing is important,
  61            you should check the timing calculations manually. 
  62          
  63          -*------------------------------------------------------------------*/
  64          void sEOS_Init_Timer2(const tByte TICK_MS)
  65             {
  66   1         tLong Inc;
  67   1         tWord Reload_16;
  68   1         tByte Reload_08H, Reload_08L;
  69   1      
  70   1         // Timer 2 is configured as a 16-bit timer,
  71   1         // which is automatically reloaded when it overflows
  72   1         T2CON   = 0x04;   // Load Timer 2 control register
  73   1      
  74   1         // Number of timer increments required (max 65536)
  75   1         Inc = ((tLong)TICK_MS * (OSC_FREQ/1000)) / (tLong)OSC_PER_INST;   
  76   1      
  77   1         // 16-bit reload value
  78   1         Reload_16 = (tWord) (65536UL - Inc);
  79   1      
  80   1         // 8-bit reload values (High & Low)
  81   1         Reload_08H = (tByte)(Reload_16 / 256);
  82   1         Reload_08L = (tByte)(Reload_16 % 256);
  83   1      
  84   1         // Used for manually checking timing (in simulator)
  85   1         //P2 = Reload_08H;
  86   1         //P3 = Reload_08L;
  87   1      
  88   1         TH2     = Reload_08H;   // Load Timer 2 high byte
  89   1         RCAP2H  = Reload_08H;   // Load Timer 2 reload capt. reg. high byte
  90   1         TL2     = Reload_08L;   // Load Timer 2 low byte
  91   1         RCAP2L  = Reload_08L;   // Load Timer 2 reload capt. reg. low byte
  92   1      
  93   1         // Timer 2 interrupt is enabled, and ISR will be called 
  94   1         // whenever the timer overflows.
  95   1         ET2     = 1;
  96   1      
  97   1         // Start Timer 2 running
  98   1         TR2   = 1;     
  99   1      
 100   1         EA = 1;            // Globally enable interrupts
 101   1         }
 102          
 103          /*------------------------------------------------------------------*-
 104            
 105            sEOS_Go_To_Sleep()
 106          
 107            This operating system enters 'idle mode' between clock ticks
 108            to save power.  The next clock tick will return the processor
 109            to the normal operating state.
 110          
 111            *** ADAPT AS REQUIRED FOR YOUR HARDWARE ***
 112          
 113          -*------------------------------------------------------------------*/
 114          void sEOS_Go_To_Sleep(void)
 115             {
 116   1         PCON |= 0x01;    // Enter idle mode (generic 8051 version)
 117   1         }
C51 COMPILER V6.21  SIMPLE_EOS                                                             01/23/2002 18:05:24 PAGE 3   

 118          
 119          /*------------------------------------------------------------------*-
 120            ---- END OF FILE -------------------------------------------------
 121          -*------------------------------------------------------------------*/


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    123    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       4
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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