src/output/analog.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2012 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 <config.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <math.h>
  24 #include <glib.h>
  25 #include <libsigrok/libsigrok.h>
  26 #include "libsigrok-internal.h"
  27
  28 #define LOG_PREFIX "output/analog"
  29
  30 struct context {
  31         int num_enabled_channels;
  32         GPtrArray *channellist;
  33         int digits;
  34         float *fdata;
  35 };
  36
  37 enum {
  38         DIGITS_ALL,
  39         DIGITS_SPEC,
  40 };
  41
  42 static int init(struct sr_output *o, GHashTable *options)
  43 {
  44         struct context *ctx;
  45         struct sr_channel *ch;
  46         GSList *l;
  47         const char *s;
  48
  49         if (!o || !o->sdi)
  50                 return SR_ERR_ARG;
  51
  52         o->priv = ctx = g_malloc0(sizeof(struct context));
  53         s = g_variant_get_string(g_hash_table_lookup(options, "digits"), NULL);
  54         if (!strcmp(s, "all"))
  55                 ctx->digits = DIGITS_ALL;
  56         else
  57                 ctx->digits = DIGITS_SPEC;
  58
  59         /* Get the number of channels and their names. */
  60         ctx->channellist = g_ptr_array_new();
  61         for (l = o->sdi->channels; l; l = l->next) {
  62                 ch = l->data;
  63                 if (!ch || !ch->enabled)
  64                         continue;
  65                 g_ptr_array_add(ctx->channellist, ch->name);
  66                 ctx->num_enabled_channels++;
  67         }
  68         ctx->fdata = NULL;
  69
  70         return SR_OK;
  71 }
  72
  73 static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet,
  74                 GString **out)
  75 {
  76         struct context *ctx;
  77         const struct sr_datafeed_analog *analog;
  78         struct sr_channel *ch;
  79         GSList *l;
  80         float *fdata;
  81         unsigned int i;
  82         int num_channels, c, ret, digits;
  83         char *number, *suffix;
  84
  85         *out = NULL;
  86         if (!o || !o->sdi)
  87                 return SR_ERR_ARG;
  88         ctx = o->priv;
  89
  90         switch (packet->type) {
  91         case SR_DF_FRAME_BEGIN:
  92                 *out = g_string_new("FRAME-BEGIN\n");
  93                 break;
  94         case SR_DF_FRAME_END:
  95                 *out = g_string_new("FRAME-END\n");
  96                 break;
  97         case SR_DF_ANALOG:
  98                 analog = packet->payload;
  99                 num_channels = g_slist_length(analog->meaning->channels);
 100                 if (!(fdata = g_try_realloc(ctx->fdata,
 101                                                 analog->num_samples * num_channels * sizeof(float))))
 102                         return SR_ERR_MALLOC;
 103                 ctx->fdata = fdata;
 104                 if ((ret = sr_analog_to_float(analog, fdata)) != SR_OK)
 105                         return ret;
 106                 *out = g_string_sized_new(512);
 107                 if (analog->encoding->is_digits_decimal) {
 108                         if (ctx->digits == DIGITS_ALL)
 109                                 digits = analog->encoding->digits;
 110                         else
 111                                 digits = analog->spec->spec_digits;
 112                 } else {
 113                         /* TODO we don't know how to print by number of bits yet. */
 114                         digits = 6;
 115                 }
 116                 gboolean si_friendly = sr_analog_si_prefix_friendly(analog->meaning->unit);
 117                 sr_analog_unit_to_string(analog, &suffix);
 118                 for (i = 0; i < analog->num_samples; i++) {
 119                         for (l = analog->meaning->channels, c = 0; l; l = l->next, c++) {
 120                                 float value = fdata[i * num_channels + c];
 121                                 const char *prefix = "";
 122                                 if (si_friendly)
 123                                         prefix = sr_analog_si_prefix(&value, &digits);
 124                                 ch = l->data;
 125                                 g_string_append_printf(*out, "%s: ", ch->name);
 126                                 number = g_strdup_printf("%.*f", MAX(digits, 0), value);
 127                                 g_string_append(*out, number);
 128                                 g_free(number);
 129                                 g_string_append(*out, " ");
 130                                 g_string_append(*out, prefix);
 131                                 g_string_append(*out, suffix);
 132                                 g_string_append(*out, "\n");
 133                         }
 134                 }
 135                 g_free(suffix);
 136                 break;
 137         }
 138
 139         return SR_OK;
 140 }
 141
 142 static struct sr_option options[] = {
 143         { "digits", "Digits", "Digits to show", NULL, NULL },
 144         ALL_ZERO
 145 };
 146
 147 static const struct sr_option *get_options(void)
 148 {
 149         if (!options[0].def) {
 150                 options[0].def = g_variant_ref_sink(g_variant_new_string("all"));
 151                 options[0].values = g_slist_append(options[0].values,
 152                                 g_variant_ref_sink(g_variant_new_string("all")));
 153                 options[0].values = g_slist_append(options[0].values,
 154                                 g_variant_ref_sink(g_variant_new_string("spec")));
 155         }
 156
 157         return options;
 158 }
 159
 160 static int cleanup(struct sr_output *o)
 161 {
 162         struct context *ctx;
 163
 164         if (!o || !o->sdi)
 165                 return SR_ERR_ARG;
 166         ctx = o->priv;
 167
 168         g_ptr_array_free(ctx->channellist, 1);
 169         g_variant_unref(options[0].def);
 170         g_slist_free_full(options[0].values, (GDestroyNotify)g_variant_unref);
 171         g_free(ctx->fdata);
 172         g_free(ctx);
 173         o->priv = NULL;
 174
 175         return SR_OK;
 176 }
 177
 178 SR_PRIV struct sr_output_module output_analog = {
 179         .id = "analog",
 180         .name = "Analog",
 181         .desc = "Analog data and types",
 182         .exts = NULL,
 183         .flags = 0,
 184         .options = get_options,
 185         .init = init,
 186         .receive = receive,
 187         .cleanup = cleanup
 188 };