prm_soft.lst

时间触发嵌入式系统设计模式:使用8051系列微控制器开发可靠应用

C51 COMPILER V6.10  PRM_SOFT                                                               04/18/2001 17:38:57 PAGE 1   


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

stmt level    source

   1          /*------------------------------------------------------------------*-
   2          
   3             PRM_Soft.c (v1.01)
   4          
   5            ------------------------------------------------------------------
   6          
   7             Simple Software PRM library.
   8          
   9             See Chapter 31 for details.
  10          
  11          
  12             COPYRIGHT
  13             ---------
  14          
  15             This code is from the book:
  16          
  17             PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont 
  18             [Pearson Education, 2001; ISBN: 0-201-33138-1].
  19          
  20             This code is copyright (c) 2001 by Michael J. Pont.
  21           
  22             See book for copyright details and other information.
  23          
  24          -*------------------------------------------------------------------*/
  25          
  26          #include "Main.h"
  27          #include "Port.h"
  28          
  29          #include "2_01_12g.h"
  30          #include "PRM_Soft.h"
  31          
  32          // Comment out this line if test function is NOT required
  33          #define PRM_test
  34          
  35          // ------ Public variable definitions ------------------------------
  36          
  37          // Set this variable to the required PRM value
  38          tWord PRM_period_new_G; 
  39          
  40          // ------ Private variable definitions------------------------------
  41          
  42          // The PRM counter
  43          static tWord PRM_position_G;
  44          static tByte PRM_period_G;
  45          
  46          /*------------------------------------------------------------------*-
  47          
  48            PRM_Soft_Init()
  49          
  50            Prepare for software PRM.
  51          
  52          -*------------------------------------------------------------------*/
  53          void PRM_Soft_Init(void)
  54             {
  55   1         // Init the main variable
C51 COMPILER V6.10  PRM_SOFT                                                               04/18/2001 17:38:57 PAGE 2   

  56   1         PRM_period_G = 2;
  57   1         PRM_period_new_G = 2;
  58   1      
  59   1         PRM_position_G = 0;
  60   1         }
  61          
  62          /*------------------------------------------------------------------*-
  63          
  64            PRM_Soft_Update()
  65          
  66            Update the software PRM output. 
  67          
  68            We have three key variables (see text for details):
  69          
  70            1. PRM_period_G is the PRM period
  71               (units are milliseconds, if we schedule once / ms)
  72          
  73            2. PRM_period_new_G is the new PRM period, set by the user
  74               (The 'new' value is copied to PRM-period only at the
  75                end of a cycle, to avoid noise)
  76               (units are milliseconds, if we schedule once / ms)
  77          
  78            3. PRM_position_G is the current position in the PRM cycle
  79               (units are milliseconds, if we schedule once / ms)
  80          
  81          
  82          -*------------------------------------------------------------------*/
  83          void PRM_Soft_Update(void)
  84             {
  85   1         // Increment the 'position' variable 
  86   1         if (++PRM_position_G >= PRM_period_G)
  87   1            {
  88   2            PRM_position_G = 0;
  89   2      
  90   2            PRM_period_G = PRM_period_new_G; 
  91   2      
  92   2            PRM_pin = 0;
  93   2      
  94   2            return;
  95   2            }
  96   1      
  97   1         // Generate the PRM output
  98   1         if (PRM_position_G < (PRM_period_G / 2))
  99   1            {
 100   2            PRM_pin = 1;
 101   2            }
 102   1         else
 103   1            {
 104   2            PRM_pin = 0;
 105   2            }
 106   1         }
 107          
 108          /*------------------------------------------------------------------*-
 109          
 110            PRM_Soft_Test()
 111          
 112            To test the PRM library, this function is called once every 
 113            minute, to change the PRM output setting.
 114          
 115          -*------------------------------------------------------------------*/
 116          #ifdef PRM_test
 117          void PRM_Soft_Test(void)
C51 COMPILER V6.10  PRM_SOFT                                                               04/18/2001 17:38:57 PAGE 3   

 118             {
 119   1         PRM_period_new_G += 2;
 120   1      
 121   1         if (PRM_period_new_G >= 60000)
 122   1            {
 123   2            PRM_period_new_G = 2;
 124   2            }
 125   1         }
 126          #endif
 127          
 128          /*------------------------------------------------------------------*-
 129            ---- END OF FILE -------------------------------------------------
 130          -*------------------------------------------------------------------*/
 131          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    100    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      5    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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