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 #define BIN_TO_DEC_DIGITS (log(2) / log(10))
  31
  32 struct context {
  33         int num_enabled_channels;
  34         GPtrArray *channellist;
  35         int digits;
  36         float *fdata;
  37 };
  38
  39 enum {
  40         DIGITS_ALL,
  41         DIGITS_SPEC,
  42 };
  43
  44 static int init(struct sr_output *o, GHashTable *options)
  45 {
  46         struct context *ctx;
  47         struct sr_channel *ch;
  48         GSList *l;
  49         const char *s;
  50
  51         if (!o || !o->sdi)
  52                 return SR_ERR_ARG;
  53
  54         o->priv = ctx = g_malloc0(sizeof(struct context));
  55         s = g_variant_get_string(g_hash_table_lookup(options, "digits"), NULL);
  56         if (!strcmp(s, "all"))
  57                 ctx->digits = DIGITS_ALL;
  58         else
  59                 ctx->digits = DIGITS_SPEC;
  60
  61         /* Get the number of channels and their names. */
  62         ctx->channellist = g_ptr_array_new();
  63         for (l = o->sdi->channels; l; l = l->next) {
  64                 ch = l->data;
  65                 if (!ch || !ch->enabled)
  66                         continue;
  67                 g_ptr_array_add(ctx->channellist, ch->name);
  68                 ctx->num_enabled_channels++;
  69         }
  70         ctx->fdata = NULL;
  71
  72         return SR_OK;
  73 }
  74
  75 static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet,
  76                 GString **out)
  77 {
  78         struct context *ctx;
  79         const struct sr_datafeed_analog *analog;
  80         const struct sr_datafeed_meta *meta;
  81         const struct sr_config *src;
  82         const struct sr_key_info *srci;
  83         struct sr_channel *ch;
  84         GSList *l;
  85         float *fdata;
  86         unsigned int i;
  87         int num_channels, c, ret, digits, actual_digits;
  88         char *number, *suffix;
  89
  90         *out = NULL;
  91         if (!o || !o->sdi)
  92                 return SR_ERR_ARG;
  93         ctx = o->priv;
  94
  95         switch (packet->type) {
  96         case SR_DF_FRAME_BEGIN:
  97                 *out = g_string_new("FRAME-BEGIN\n");
  98                 break;
  99         case SR_DF_FRAME_END:
 100                 *out = g_string_new("FRAME-END\n");
 101                 break;
 102         case SR_DF_META:
 103                 meta = packet->payload;
 104                 for (l = meta->config; l; l = l->next) {
 105                         src = l->data;
 106                         if (!(srci = sr_key_info_get(SR_KEY_CONFIG, src->key)))
 107                                 return SR_ERR;
 108                         *out = g_string_sized_new(512);
 109                         g_string_append(*out, "META ");
 110                         g_string_append_printf(*out, "%s: ", srci->id);
 111                         if (srci->datatype == SR_T_BOOL) {
 112                                 g_string_append_printf(*out, "%u",
 113                                         g_variant_get_boolean(src->data));
 114                         } else if (srci->datatype == SR_T_FLOAT) {
 115                                 g_string_append_printf(*out, "%f",
 116                                         g_variant_get_double(src->data));
 117                         } else if (srci->datatype == SR_T_UINT64) {
 118                                 g_string_append_printf(*out, "%"
 119                                         G_GUINT64_FORMAT,
 120                                         g_variant_get_uint64(src->data));
 121                         }
 122                         g_string_append(*out, "\n");
 123                 }
 124                 break;
 125         case SR_DF_ANALOG:
 126                 analog = packet->payload;
 127                 num_channels = g_slist_length(analog->meaning->channels);
 128                 if (!(fdata = g_try_realloc(ctx->fdata,
 129                                                 analog->num_samples * num_channels * sizeof(float))))
 130                         return SR_ERR_MALLOC;
 131                 ctx->fdata = fdata;
 132                 if ((ret = sr_analog_to_float(analog, fdata)) != SR_OK)
 133                         return ret;
 134                 *out = g_string_sized_new(512);
 135                 if (ctx->digits == DIGITS_ALL)
 136                         digits = analog->encoding->digits;
 137                 else
 138                         digits = analog->spec->spec_digits;
 139                 if (!analog->encoding->is_digits_decimal)
 140                         digits = copysign(ceil(abs(digits) * BIN_TO_DEC_DIGITS), digits);
 141                 gboolean si_friendly = sr_analog_si_prefix_friendly(analog->meaning->unit);
 142                 sr_analog_unit_to_string(analog, &suffix);
 143                 for (i = 0; i < analog->num_samples; i++) {
 144                         for (l = analog->meaning->channels, c = 0; l; l = l->next, c++) {
 145                                 float value = fdata[i * num_channels + c];
 146                                 const char *prefix = "";
 147                                 actual_digits = digits;
 148                                 if (si_friendly)
 149                                         prefix = sr_analog_si_prefix(&value, &actual_digits);
 150                                 ch = l->data;
 151                                 g_string_append_printf(*out, "%s: ", ch->name);
 152                                 number = g_strdup_printf("%.*f", MAX(actual_digits, 0), value);
 153                                 g_string_append(*out, number);
 154                                 g_free(number);
 155                                 g_string_append(*out, " ");
 156                                 g_string_append(*out, prefix);
 157                                 g_string_append(*out, suffix);
 158                                 g_string_append(*out, "\n");
 159                         }
 160                 }
 161                 g_free(suffix);
 162                 break;
 163         }
 164
 165         return SR_OK;
 166 }
 167
 168 static struct sr_option options[] = {
 169         { "digits", "Digits", "Digits to show", NULL, NULL },
 170         ALL_ZERO
 171 };
 172
 173 static const struct sr_option *get_options(void)
 174 {
 175         if (!options[0].def) {
 176                 options[0].def = g_variant_ref_sink(g_variant_new_string("all"));
 177                 options[0].values = g_slist_append(options[0].values,
 178                                 g_variant_ref_sink(g_variant_new_string("all")));
 179                 options[0].values = g_slist_append(options[0].values,
 180                                 g_variant_ref_sink(g_variant_new_string("spec")));
 181         }
 182
 183         return options;
 184 }
 185
 186 static int cleanup(struct sr_output *o)
 187 {
 188         struct context *ctx;
 189
 190         if (!o || !o->sdi)
 191                 return SR_ERR_ARG;
 192         ctx = o->priv;
 193
 194         g_ptr_array_free(ctx->channellist, 1);
 195         g_variant_unref(options[0].def);
 196         g_slist_free_full(options[0].values, (GDestroyNotify)g_variant_unref);
 197         g_free(ctx->fdata);
 198         g_free(ctx);
 199         o->priv = NULL;
 200
 201         return SR_OK;
 202 }
 203
 204 SR_PRIV struct sr_output_module output_analog = {
 205         .id = "analog",
 206         .name = "Analog",
 207         .desc = "ASCII analog data values and units",
 208         .exts = NULL,
 209         .flags = 0,
 210         .options = get_options,
 211         .init = init,
 212         .receive = receive,
 213         .cleanup = cleanup
 214 };