libveriuser/delay.c

   1 /*
   2  * Copyright (c) 2003 Stephen Williams (steve@icarus.com)
   3  *
   4  *    This source code is free software; you can redistribute it
   5  *    and/or modify it in source code form under the terms of the GNU
   6  *    General Public License as published by the Free Software
   7  *    Foundation; either version 2 of the License, or (at your option)
   8  *    any later version.
   9  *
  10  *    This program is distributed in the hope that it will be useful,
  11  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *    GNU General Public License for more details.
  14  *
  15  *    You should have received a copy of the GNU General Public License
  16  *    along with this program; if not, write to the Free Software
  17  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  18  */
  19 #ifdef HAVE_CVS_IDENT
  20 #ident "$Id: delay.c,v 1.3 2003/06/17 16:55:07 steve Exp $"
  21 #endif
  22
  23 #include  <veriuser.h>
  24 #include  <vpi_user.h>
  25 #include  "priv.h"
  26 #include  <assert.h>
  27
  28 static PLI_INT32 delay_callback(struct t_cb_data*cb)
  29 {
  30       vpi_printf("XXXX delay_callback called.\n");
  31       return 0;
  32 }
  33
  34 int tf_isetdelay(PLI_INT32 delay, void*ss)
  35 {
  36       vpiHandle sys = (vpiHandle)ss;
  37       int unit = vpi_get(vpiTimeUnit, sys);
  38       int prec = vpi_get(vpiTimePrecision, 0);
  39
  40       struct t_cb_data cb;
  41       struct t_vpi_time ct;
  42
  43       if (pli_trace) {
  44             fprintf(pli_trace, "%s: tf_isetdelay(%d, ...)"
  45                     " <unit=%d, prec=%d>;\n",
  46                     vpi_get_str(vpiName, sys), delay, unit, prec);
  47       }
  48
  49
  50         /* Convert the delay from the UNITS of the specified
  51            task/function to the precision of the simulation. */
  52       assert(unit >= prec);
  53
  54       while (unit > prec) {
  55             PLI_INT32 tmp = delay * 10;
  56             assert(tmp > delay);
  57             delay = tmp;
  58             unit -= 1;
  59       }
  60
  61         /* Create a VPI callback to schedule the delay. */
  62       ct.type = vpiSimTime;
  63       ct.high = 0;
  64       ct.low  = delay;
  65
  66       cb.reason = cbAfterDelay;
  67       cb.cb_rtn = delay_callback;
  68       cb.obj = 0;
  69       cb.time = &ct;
  70       cb.value = 0;
  71       cb.user_data = 0;
  72       vpi_register_cb(&cb);
  73
  74       return 0;
  75 }
  76
  77 int tf_setdelay(PLI_INT32 delay)
  78 {
  79       return tf_isetdelay(delay, tf_getinstance());
  80 }
  81
  82 /*
  83  * $Log: delay.c,v $
  84  * Revision 1.3  2003/06/17 16:55:07  steve
  85  *  1) setlinebuf() for vpi_trace
  86  *  2) Addes error checks for trace file opens
  87  *  3) removes now extraneous flushes
  88  *  4) fixes acc_next() bug
  89  *
  90  * Revision 1.2  2003/05/28 02:42:43  steve
  91  *  compiler warnings.
  92  *
  93  * Revision 1.1  2003/05/18 00:16:35  steve
  94  *  Add PLI_TRACE tracing of PLI1 modules.
  95  *
  96  *  Add tf_isetdelay and friends, and add
  97  *  callback return values for acc_vcl support.
  98  *
  99  */
 100