pwm.lst

定时器源代码． 定时器源代码．

C51 COMPILER V7.20   PWM                                                                   01/01/2002 02:51:06 PAGE 1   


C51 COMPILER V7.20, COMPILATION OF MODULE PWM
OBJECT MODULE PLACED IN pwm.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE pwm.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include <reg51.h>
   2          #define OSC  12000000
   3          #define C_40us  (65536-OSC/(12000000/18))                                    
   4          sbit 
   5          out=P1^0;                                                                   
   6          sbit 
   7          key_add=P1^1;                                                               
   8          sbit 
   9          key_dec=P1^2;                                                               
  10          unsigned  char   cout=50;
  11          unsigned   char    
  12          cout_x;                                                       
  13          unsigned    int    i;
  14          void  timer(cout_x)
  15          {TMOD=0x10;
  16   1      TR1=1;
  17   1      while(cout_x--)
  18   1      {TH1=C_40us/256;
  19   2      TL1=C_40us%256;
  20   2      while(!TF1);
  21   2      TF1=0;}
  22   1      TR1=0;
  23   1      }
  24          
  25          void  pwm_add(void)
  26          {
  27   1      if(key_add==0)
  28   1      {cout+=10;
  29   2      if(cout>=100)
  30   2      cout=100;}
  31   1      while(key_add==0);
  32   1      }
  33          void  pwm_dec(void)
  34          {if(key_dec==0)
  35   1      {cout-=10;
  36   2      if(cout<=0)
  37   2      cout=0;}
  38   1      while(key_dec==0);
  39   1      }
  40          void main(void)
  41          {while(1)
  42   1      {
  43   2      pwm_dec();
  44   2      pwm_add();
  45   2      out=1;
  46   2      timer(cout);
  47   2      out=0;
  48   2      timer(100-cout);}
  49   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    105    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
C51 COMPILER V7.20   PWM                                                                   01/01/2002 02:51:06 PAGE 2   

   PDATA SIZE       =   ----    ----
   DATA SIZE        =      4    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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