C51 COMPILER V6.10  PWM_515C                                                               04/19/2001 12:02:07 PAGE 1   


C51 COMPILER V6.10, COMPILATION OF MODULE PWM_515C
OBJECT MODULE PLACED IN .\PWM_515C.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE .\PWM_515C.C OPTIMIZE(6,SPEED) BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          /*------------------------------------------------------------------*-
   2          
   3             PWM_515c.c (v1.00)
   4          
   5            ------------------------------------------------------------------
   6          
   7             Rudimentary PWM library for 80c515c.
   8             
   9             Created with help from DaVE.
  10          
  11             Uses T2 / Capture / Compare unit.
  12          
  13          
  14             COPYRIGHT
  15             ---------
  16          
  17             This code is from the book:
  18          
  19             PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont 
  20             [Pearson Education, 2001; ISBN: 0-201-33138-1].
  21          
  22             This code is copyright (c) 2001 by Michael J. Pont.
  23           
  24             See book for copyright details and other information.
  25           
  26          -*------------------------------------------------------------------*/
  27          
  28          
  29          #include "Main.h"
  30          #include "PWM_515c.h"
  31          
  32          /*------------------------------------------------------------------*-
  33          
  34            PWM_Init_T2()
  35          
  36            Prepare on-chip PWM unit on the c515c.
  37          
  38          -*------------------------------------------------------------------*/
  39          void PWM_Init_T2(void)
  40             {
  41   1         // ---------- T2 Mode ---------------------------
  42   1         // Mode 1 = Timerfunction
  43   1      
  44   1         // Prescaler: Fcpu/6
  45   1      
  46   1         // ---------- T2 reload mode selection ----------
  47   1         // Mode 0 = auto-reload upon timer overflow
  48   1         // Preset the timer register with autoreload value ! 0x0000;
  49   1         TL2 = 0x00;
  50   1         TH2 = 0xFF;
  51   1        
  52   1         // ---------- T2 general compare mode ----------
  53   1         //  Mode 0 for all channels
  54   1         T2CON |= 0x11;
  55   1      
C51 COMPILER V6.10  PWM_515C                                                               04/19/2001 12:02:07 PAGE 2   

  56   1         // ---------- T2 general interrupts ------------
  57   1         //  timer 2 overflow interrupt is disabled
  58   1         ET2=0;
  59   1         //  timer 2 external reload interrupt is disabled
  60   1         EXEN2=0;
  61   1      
  62   1         // ---------- Compare/capture Channel 0 ---------
  63   1         // disabled
  64   1         // Set Compare Register CRC on: 0xFF00;
  65   1         CRCL = 0x00;
  66   1         CRCH = 0xFF;
  67   1        
  68   1         //  CC0/ext3 interrupt is disabled
  69   1         EX3=0;
  70   1        
  71   1         // ---------- Compare/capture Channel 1 ---------
  72   1         // Compare enabled
  73   1         // Set Compare Register CC1 on: 0xFF80;
  74   1         CCL1 = 0x80;
  75   1         CCH1 = 0xFF;
  76   1        
  77   1         //  CC1/ext4 interrupt is disabled
  78   1         EX4=0;
  79   1        
  80   1         // ---------- Compare/capture Channel 2 ---------
  81   1         // disabled
  82   1         // Set Compare Register CC2 on: 0x0000;
  83   1         CCL2 = 0x00;
  84   1         CCH2 = 0x00;
  85   1         //  CC2/ext5 interrupt is disabled
  86   1         EX5=0;
  87   1        
  88   1         // ---------- Compare/capture Channel 3 ---------
  89   1         // disabled
  90   1         // Set Compare Register CC3 on: 0x0000;
  91   1         CCL3 = 0x000;
  92   1         CCH3 = 0x000;
  93   1        
  94   1         // CC3/ext6 interrupt is disabled
  95   1         EX6=0;
  96   1        
  97   1         // Set all above mentioned modes for channel 0-3 
  98   1         CCEN = 0x08;
  99   1         }
 100          
 101          /*------------------------------------------------------------------*-
 102          
 103            PWM_Update_T2()
 104          
 105            Update the PWM output value (capture/compare Channel 1)
 106          
 107            Output is on Pin 1.1.
 108          
 109            NOTE: Hardware will continue to produce this value (indefinitely), 
 110            without software intervention, until the next update.
 111          
 112          -*------------------------------------------------------------------*/
 113          void PWM_Update_T2(const tByte New_PWM_value)
 114             {
 115   1         CCL1 = New_PWM_value;
 116   1         }
 117          
C51 COMPILER V6.10  PWM_515C                                                               04/19/2001 12:02:07 PAGE 3   

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


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     47    ----
   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)