sdcc/sim/ucsim/src/sims/s51.src/wdt.cc

   1 /*
   2  * Simulator of microcontrollers (wdt.cc)
   3  *
   4  * Copyright (C) 1999 Drotos Daniel
   5  *
   6  * To contact author send email to dr.dkdb@gmail.com
   7  *
   8  */
   9
  10 /* This file is part of microcontroller simulator: ucsim.
  11
  12 UCSIM is free software; you can redistribute it and/or modify
  13 it under the terms of the GNU General Public License as published by
  14 the Free Software Foundation; either version 2 of the License, or
  15 (at your option) any later version.
  16
  17 UCSIM is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with UCSIM; see the file COPYING.  If not, write to the Free
  24 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  25 02111-1307, USA. */
  26 /*@1@*/
  27
  28 #include <stdio.h>
  29 //#include <ctype.h>
  30
  31 // local
  32 #include "wdtcl.h"
  33 #include "regs51.h"
  34
  35
  36 cl_wdt::cl_wdt(class cl_uc *auc, long resetvalue):
  37   cl_hw(auc, HW_WDT, 0, "wdt")
  38 {
  39   reset_value= resetvalue;
  40   wdt= -1;
  41   written_since_reset= false;
  42 }
  43
  44 int
  45 cl_wdt::init(void)
  46 {
  47   class cl_address_space *sfr= uc->address_space(MEM_SFR_ID);
  48
  49   cl_hw::init();
  50   if (!sfr)
  51     {
  52       fprintf(stderr, "No SFR to register WDT into\n");
  53     }
  54   wdtrst= register_cell(sfr, WDTRST);
  55   return(0);
  56 }
  57
  58 void
  59 cl_wdt::write(class cl_memory_cell *cell, t_mem *val)
  60 {
  61   if (cell == wdtrst &&
  62       (((*val)&0xff) == 0xe1) &&
  63       (wdtrst->get() == 0x1e) &&
  64       written_since_reset)
  65     {
  66       wdt= 0;
  67     }
  68   written_since_reset= true;
  69 }
  70
  71 int
  72 cl_wdt::tick(int cycles)
  73 {
  74   if (wdt >= 0)
  75     {
  76       wdt+= cycles;
  77       if (wdt > reset_value)
  78         {
  79           uc->reset();
  80           //return(resWDTRESET);
  81         }
  82     }
  83   return(0);
  84 }
  85
  86 void
  87 cl_wdt::reset(void)
  88 {
  89   written_since_reset= false;
  90   wdt= -1;
  91 }
  92
  93 void
  94 cl_wdt::print_info(class cl_console_base *con)
  95 {
  96   con->dd_printf("%s[%d] %s counter=%d (remains=%d)\n", id_string, id,
  97                  (wdt>=0)?"ON":"OFF", wdt, (wdt>=0)?(reset_value-wdt):0);
  98   //print_cfg_info(con);
  99 }
 100
 101
 102 /* End of s51.src/wdt.cc */