swit_c.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  SWIT_C                                                                 04/18/2001 16:15:53 PAGE 1   


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

stmt level    source

   1          /*------------------------------------------------------------------*-
   2          
   3             SWIT_C.C (v1.00)
   4           
   5            ------------------------------------------------------------------
   6          
   7             On-Off Switch code, with software debounce.
   8          
   9          
  10             COPYRIGHT
  11             ---------
  12          
  13             This code is from the book:
  14          
  15             PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont 
  16             [Pearson Education, 2001; ISBN: 0-201-33138-1].
  17          
  18             This code is copyright (c) 2001 by Michael J. Pont.
  19           
  20             See book for copyright details and other information.
  21          
  22          -*------------------------------------------------------------------*/
  23          
  24          #include "Main.h"
  25          #include "Port.h"
  26          
  27          #include "Swit_C.h"
  28          
  29          // ------ Public variable definitions ------------------------------
  30          
  31          bit Sw_pressed_G = 0; // The current switch status
  32          
  33          
  34          // ------ Private constants ----------------------------------------
  35          
  36          // Allows NO or NC switch to be used (or other wiring variations)
  37          #define SW_PRESSED (0)
  38          
  39          // SW_THRES must be > 1 for correct debounce behaviour
  40          #define SW_THRES (3)
  41          
  42          // ------ Private variables ----------------------------------------
  43          
  44          static tByte Sw_press_duration_G = 0;
  45          static tByte Sw_blocked_G = 0;
  46          
  47          
  48          /*------------------------------------------------------------------*-
  49          
  50            FUNCTION: SWITCH_ON_OFF_Init()
  51          
  52            Initialisation function for the switch library.
  53          
  54          -*------------------------------------------------------------------*/
  55          void SWITCH_ON_OFF_Init(void)
C51 COMPILER V6.10  SWIT_C                                                                 04/18/2001 16:15:53 PAGE 2   

  56             {
  57   1         Sw_pin = 1;      // Use this pin for input
  58   1      
  59   1         Sw_pressed_G = 0;  // Switch is initially OFF
  60   1         Sw_press_duration_G = 0;  
  61   1         Sw_blocked_G = 0;
  62   1         }
  63          
  64          /*------------------------------------------------------------------*-
  65          
  66            FUNCTION: SWITCH_ON_OFF_Update()
  67            
  68            This is the main on-off switch function.  
  69          
  70            It should be scheduled every 50 - 500 ms.
  71          
  72          -*------------------------------------------------------------------*/
  73          void SWITCH_ON_OFF_Update(void)
  74             {
  75   1         // If the switch is blocked, decrement the count and return
  76   1         // without checking the switch pin status.
  77   1         // This is done to give the user time to remove their finger 
  78   1         // from the switch - otherwise if they keep their finger on
  79   1         // the switch for more than 0.4s the light will switch off again.
  80   1      
  81   1         if (Sw_blocked_G)
  82   1            {
  83   2            Sw_blocked_G--;
  84   2            return;
  85   2            }
  86   1      
  87   1         if (Sw_pin == SW_PRESSED)
  88   1            {
  89   2            Sw_press_duration_G += 1;
  90   2      
  91   2            if (Sw_press_duration_G > SW_THRES)
  92   2               {
  93   3               Sw_press_duration_G = SW_THRES;
  94   3      
  95   3               // Change switch state
  96   3               if (Sw_pressed_G == 1)
  97   3                  { 
  98   4                  Sw_pressed_G = 0;  // Switch state changed to OFF
  99   4                  }
 100   3               else
 101   3                  { 
 102   4                  Sw_pressed_G = 1;  // Switch state changed to ON
 103   4                  }
 104   3      
 105   3               // Allow no other changes for ~1 second
 106   3               Sw_blocked_G = 5;  
 107   3               return;
 108   3               }
 109   2      
 110   2            // Switch pressed, but not yet for long enough
 111   2            return; 
 112   2            }
 113   1          
 114   1         // Switch not pressed - reset the count
 115   1         Sw_press_duration_G = 0;
 116   1         }
 117          
C51 COMPILER V6.10  SWIT_C                                                                 04/18/2001 16:15:53 PAGE 3   

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


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     49    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      2    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
END OF MODULE INFORMATION.


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