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 SR_API struct sr_trigger *sr_trigger_new(const char *name)
  28 {
  29         struct sr_trigger *trig;
  30
  31         trig = g_malloc0(sizeof(struct sr_trigger));
  32         if (name)
  33                 trig->name = g_strdup(name);
  34
  35         return trig;
  36 }
  37
  38 SR_API void sr_trigger_free(struct sr_trigger *trig)
  39 {
  40         struct sr_trigger_stage *stage;
  41         GSList *l;
  42
  43         for (l = trig->stages; l; l = l->next) {
  44                 stage = l->data;
  45                 g_slist_free_full(stage->matches, g_free);
  46         }
  47         g_slist_free_full(trig->stages, g_free);
  48
  49         g_free(trig->name);
  50         g_free(trig);
  51 }
  52
  53 SR_API struct sr_trigger_stage *sr_trigger_stage_add(struct sr_trigger *trig)
  54 {
  55         struct sr_trigger_stage *stage;
  56
  57         stage = g_malloc0(sizeof(struct sr_trigger_stage));
  58         stage->stage = g_slist_length(trig->stages);
  59         trig->stages = g_slist_append(trig->stages, stage);
  60
  61         return stage;
  62 }
  63
  64 SR_API int sr_trigger_match_add(struct sr_trigger_stage *stage,
  65                 struct sr_channel *ch, int trigger_match, float value)
  66 {
  67         struct sr_trigger_match *match;
  68
  69         if (ch->type == SR_CHANNEL_LOGIC) {
  70                 if (trigger_match != SR_TRIGGER_ZERO &&
  71                                 trigger_match != SR_TRIGGER_ONE &&
  72                                 trigger_match != SR_TRIGGER_RISING &&
  73                                 trigger_match != SR_TRIGGER_FALLING &&
  74                                 trigger_match != SR_TRIGGER_EDGE) {
  75                         sr_err("Invalid trigger match for a logic channel.");
  76                         return SR_ERR_ARG;
  77                 }
  78
  79
  80         } else if (ch->type == SR_CHANNEL_ANALOG) {
  81                 if (trigger_match != SR_TRIGGER_FALLING &&
  82                                 trigger_match != SR_TRIGGER_OVER &&
  83                                 trigger_match != SR_TRIGGER_UNDER) {
  84                         sr_err("Invalid trigger match for an analog channel.");
  85                         return SR_ERR_ARG;
  86                 }
  87         }
  88
  89         match = g_malloc0(sizeof(struct sr_trigger_match));
  90         match->channel = ch;
  91         match->match = trigger_match;
  92         match->value = value;
  93         stage->matches = g_slist_append(stage->matches, match);
  94
  95         return SR_OK;
  96 }