timertick.lst

这是一个基于8255扩展端口的keil c51固件

C51 COMPILER V7.00  TIMERTICK                                                              01/05/2004 23:20:12 PAGE 1   


C51 COMPILER V7.00, COMPILATION OF MODULE TIMERTICK
OBJECT MODULE PLACED IN TIMERTICK.OBJ
COMPILER INVOKED BY: F:\Keil\C51\BIN\C51.EXE TIMERTICK.C LARGE BROWSE INTVECTOR(0X8000) DEBUG OBJECTEXTEND TABS(2)

stmt level    source

   1          /*
   2            Copyright (C) 2003 Bart Bilos <[e-mail]>.
   3          
   4            This program is free software; you can redistribute it and/or
   5            modify it under the terms of the GNU General Public License
   6            as published by the Free Software Foundation; either version 2
   7            of the License, or (at your option) any later version.
   8          
   9            This program is distributed in the hope that it will be useful,
  10            but WITHOUT ANY WARRANTY; without even the implied warranty of
  11            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12            GNU General Public License for more details.
  13          
  14            You should have received a copy of the GNU General Public License
  15            along with this program; if not, write to the Free Software Foundation, 
  16            Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17          
  18          */
  19          
  20          /*
  21            Timer library, basically functions to see how much time has elapsed
  22            since boot of the program, handy to use to calculate timeouts and 
  23            benchmarks.
  24          */
  25          
  26          #include <Dallas\REG320.H>
  27          #include "timertick.h"
  28          
  29          // how many units since boot
  30          unsigned int timeunits=UNIT_SEC;
  31          unsigned long int seconds=0;
  32          
  33          // ISR for timer ticker
  34          void int1(void) interrupt 1 using 3 {
  35   1        timeunits--;
  36   1        if(timeunits==0){
  37   2          timeunits=UNIT_SEC; 
  38   2          seconds++;
  39   2        }
  40   1      }
  41          
  42          void inittimer(void) {
  43   1          // timer mode 1 reload mode
  44   1        TMOD = (TMOD & 0xF0) | (0x02);
  45   1        // cycle count
  46   1        TL0 = 0xFF - CYCLE_COUNT;     
  47   1        // cycle count
  48   1        TH0 = 0xFF - CYCLE_COUNT;     
  49   1          // timer 0 on
  50   1        TR0 = 1;
  51   1        // allow interrupts from timer 0
  52   1        IE = IE | 0x82;
  53   1      }
  54          
  55          // return amount of seconds elapsed since init of timer
C51 COMPILER V7.00  TIMERTICK                                                              01/05/2004 23:20:12 PAGE 2   

  56          long int getseconds(void) {
  57   1      return seconds;
  58   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    118    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =      6    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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