src/trigger.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "libsigrok.h"
  21 #include "libsigrok-internal.h"
  22
  23 /* * @cond PRIVATE */
  24 #define LOG_PREFIX "trigger"
  25 /* * @endcond */
  26
  27 /**
  28  * @file
  29  *
  30  * Creating, using, or destroying triggers.
  31  */
  32
  33 /**
  34  * @defgroup grp_trigger Trigger handling
  35  *
  36  * Creating, using, or destroying triggers.
  37  *
  38  * @{
  39  */
  40
  41 SR_API struct sr_trigger *sr_trigger_new(const char *name)
  42 {
  43         struct sr_trigger *trig;
  44
  45         trig = g_malloc0(sizeof(struct sr_trigger));
  46         if (name)
  47                 trig->name = g_strdup(name);
  48
  49         return trig;
  50 }
  51
  52 SR_API void sr_trigger_free(struct sr_trigger *trig)
  53 {
  54         struct sr_trigger_stage *stage;
  55         GSList *l;
  56
  57         for (l = trig->stages; l; l = l->next) {
  58                 stage = l->data;
  59                 g_slist_free_full(stage->matches, g_free);
  60         }
  61         g_slist_free_full(trig->stages, g_free);
  62
  63         g_free(trig->name);
  64         g_free(trig);
  65 }
  66
  67 SR_API struct sr_trigger_stage *sr_trigger_stage_add(struct sr_trigger *trig)
  68 {
  69         struct sr_trigger_stage *stage;
  70
  71         stage = g_malloc0(sizeof(struct sr_trigger_stage));
  72         stage->stage = g_slist_length(trig->stages);
  73         trig->stages = g_slist_append(trig->stages, stage);
  74
  75         return stage;
  76 }
  77
  78 SR_API int sr_trigger_match_add(struct sr_trigger_stage *stage,
  79                 struct sr_channel *ch, int trigger_match, float value)
  80 {
  81         struct sr_trigger_match *match;
  82
  83         if (ch->type == SR_CHANNEL_LOGIC) {
  84                 if (trigger_match != SR_TRIGGER_ZERO &&
  85                                 trigger_match != SR_TRIGGER_ONE &&
  86                                 trigger_match != SR_TRIGGER_RISING &&
  87                                 trigger_match != SR_TRIGGER_FALLING &&
  88                                 trigger_match != SR_TRIGGER_EDGE) {
  89                         sr_err("Invalid trigger match for a logic channel.");
  90                         return SR_ERR_ARG;
  91                 }
  92
  93
  94         } else if (ch->type == SR_CHANNEL_ANALOG) {
  95                 if (trigger_match != SR_TRIGGER_FALLING &&
  96                                 trigger_match != SR_TRIGGER_OVER &&
  97                                 trigger_match != SR_TRIGGER_UNDER) {
  98                         sr_err("Invalid trigger match for an analog channel.");
  99                         return SR_ERR_ARG;
 100                 }
 101         }
 102
 103         match = g_malloc0(sizeof(struct sr_trigger_match));
 104         match->channel = ch;
 105         match->match = trigger_match;
 106         match->value = value;
 107         stage->matches = g_slist_append(stage->matches, match);
 108
 109         return SR_OK;
 110 }
 111
 112 /** @} */