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 <stdlib.h>
  21 #include <string.h>
  22 #include <math.h>
  23 #include <glib.h>
  24 #include "libsigrok.h"
  25 #include "libsigrok-internal.h"
  26
  27 /* Message logging helpers with subsystem-specific prefix string. */
  28 #define LOG_PREFIX "output/analog: "
  29 #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
  30 #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
  31 #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
  32 #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
  33 #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
  34 #define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
  35
  36 struct context {
  37         int num_enabled_probes;
  38         GPtrArray *probelist;
  39 };
  40
  41 static int init(struct sr_output *o)
  42 {
  43         struct context *ctx;
  44         struct sr_probe *probe;
  45         GSList *l;
  46
  47         sr_spew("Initializing output module.");
  48
  49         if (!o || !o->sdi)
  50                 return SR_ERR_ARG;
  51
  52         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
  53                 sr_err("Output module context malloc failed.");
  54                 return SR_ERR_MALLOC;
  55         }
  56         o->internal = ctx;
  57
  58         /* Get the number of probes and their names. */
  59         ctx->probelist = g_ptr_array_new();
  60         for (l = o->sdi->probes; l; l = l->next) {
  61                 probe = l->data;
  62                 if (!probe || !probe->enabled)
  63                         continue;
  64                 g_ptr_array_add(ctx->probelist, probe->name);
  65                 ctx->num_enabled_probes++;
  66         }
  67
  68         return SR_OK;
  69 }
  70
  71 static void si_printf(float value, GString *out, char *unitstr)
  72 {
  73         float v;
  74
  75         if (signbit(value))
  76                 v = -(value);
  77         else
  78                 v = value;
  79
  80         if (v < 1e-12 || v > 1e+12)
  81                 g_string_append_printf(out, "%f %s", value, unitstr);
  82         else if (v > 1e+9)
  83                 g_string_append_printf(out, "%f G%s", value / 1e+9, unitstr);
  84         else if (v > 1e+6)
  85                 g_string_append_printf(out, "%f M%s", value / 1e+6, unitstr);
  86         else if (v > 1e+3)
  87                 g_string_append_printf(out, "%f k%s", value / 1e+3, unitstr);
  88         else if (v < 1e-9)
  89                 g_string_append_printf(out, "%f n%s", value * 1e+9, unitstr);
  90         else if (v < 1e-6)
  91                 g_string_append_printf(out, "%f u%s", value * 1e+6, unitstr);
  92         else if (v < 1e-3)
  93                 g_string_append_printf(out, "%f m%s", value * 1e+3, unitstr);
  94         else
  95                 g_string_append_printf(out, "%f %s", value, unitstr);
  96
  97 }
  98
  99 static void fancyprint(int unit, int mqflags, float value, GString *out)
 100 {
 101         switch (unit) {
 102         case SR_UNIT_VOLT:
 103                 si_printf(value, out, "V");
 104                 break;
 105         case SR_UNIT_AMPERE:
 106                 si_printf(value, out, "A");
 107                 break;
 108         case SR_UNIT_OHM:
 109                 si_printf(value, out, "");
 110                 g_string_append_unichar(out, 0x2126);
 111                 break;
 112         case SR_UNIT_FARAD:
 113                 si_printf(value, out, "F");
 114                 break;
 115         case SR_UNIT_KELVIN:
 116                 si_printf(value, out, "K");
 117                 break;
 118         case SR_UNIT_CELSIUS:
 119                 si_printf(value, out, "");
 120                 g_string_append_unichar(out, 0x00b0);
 121                 g_string_append_c(out, 'C');
 122                 break;
 123         case SR_UNIT_FAHRENHEIT:
 124                 si_printf(value, out, "");
 125                 g_string_append_unichar(out, 0x00b0);
 126                 g_string_append_c(out, 'F');
 127                 break;
 128         case SR_UNIT_HERTZ:
 129                 si_printf(value, out, "Hz");
 130                 break;
 131         case SR_UNIT_PERCENTAGE:
 132                 g_string_append_printf(out, "%f%%", value);
 133                 break;
 134         case SR_UNIT_BOOLEAN:
 135                 if (value > 0)
 136                         g_string_append_printf(out, "TRUE");
 137                 else
 138                         g_string_append_printf(out, "FALSE");
 139                 break;
 140         case SR_UNIT_SECOND:
 141                 si_printf(value, out, "s");
 142                 break;
 143         case SR_UNIT_SIEMENS:
 144                 si_printf(value, out, "S");
 145                 break;
 146         case SR_UNIT_DECIBEL_MW:
 147                 si_printf(value, out, "dBu");
 148                 break;
 149         case SR_UNIT_DECIBEL_VOLT:
 150                 si_printf(value, out, "dBV");
 151                 break;
 152         case SR_UNIT_DECIBEL_SPL:
 153                 if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_A)
 154                         si_printf(value, out, "dB(A)");
 155                 else if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_C)
 156                         si_printf(value, out, "dB(C)");
 157                 else if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_Z)
 158                         si_printf(value, out, "dB(Z)");
 159                 else
 160                         /* No frequency weighting, or non-standard "flat" */
 161                         si_printf(value, out, "dB(SPL)");
 162                 if (mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_S)
 163                         g_string_append(out, " S");
 164                 else if (mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_F)
 165                         g_string_append(out, " F");
 166                 if (mqflags & SR_MQFLAG_SPL_LAT)
 167                         g_string_append(out, " LAT");
 168                 else if (mqflags & SR_MQFLAG_SPL_PCT_OVER_ALARM)
 169                         /* Not a standard function for SLMs, so this is
 170                          * a made-up notation. */
 171                         g_string_append(out, " %oA");
 172                 break;
 173         case SR_UNIT_CONCENTRATION:
 174                 g_string_append_printf(out, "%f ppm", value * 1000000);
 175                 break;
 176         default:
 177                 si_printf(value, out, "");
 178                 break;
 179         }
 180         if ((mqflags & (SR_MQFLAG_AC | SR_MQFLAG_DC)) == (SR_MQFLAG_AC | SR_MQFLAG_DC))
 181                 g_string_append_printf(out, " AC+DC");
 182         else if (mqflags & SR_MQFLAG_AC)
 183                 g_string_append_printf(out, " AC");
 184         else if (mqflags & SR_MQFLAG_DC)
 185                 g_string_append_printf(out, " DC");
 186         g_string_append_c(out, '\n');
 187 }
 188
 189 static int receive(struct sr_output *o, const struct sr_dev_inst *sdi,
 190                 const struct sr_datafeed_packet *packet, GString **out)
 191 {
 192         const struct sr_datafeed_analog *analog;
 193         struct sr_probe *probe;
 194         GSList *l;
 195         const float *fdata;
 196         int i, p;
 197
 198         (void)sdi;
 199
 200         *out = NULL;
 201         if (!o || !o->sdi)
 202                 return SR_ERR_ARG;
 203
 204         switch (packet->type) {
 205         case SR_DF_FRAME_BEGIN:
 206                 *out = g_string_new("FRAME-BEGIN\n");
 207                 break;
 208         case SR_DF_FRAME_END:
 209                 *out = g_string_new("FRAME-END\n");
 210                 break;
 211         case SR_DF_ANALOG:
 212                 analog = packet->payload;
 213                 fdata = (const float *)analog->data;
 214                 *out = g_string_sized_new(512);
 215                 for (i = 0; i < analog->num_samples; i++) {
 216                         for (l = analog->probes, p = 0; l; l = l->next, p++) {
 217                                 probe = l->data;
 218                                 g_string_append_printf(*out, "%s: ", probe->name);
 219                                 fancyprint(analog->unit, analog->mqflags,
 220                                                 fdata[i + p], *out);
 221                         }
 222                 }
 223                 break;
 224         }
 225
 226         return SR_OK;
 227 }
 228
 229 static int cleanup(struct sr_output *o)
 230 {
 231         struct context *ctx;
 232
 233         if (!o || !o->sdi)
 234                 return SR_ERR_ARG;
 235         ctx = o->internal;
 236
 237         g_ptr_array_free(ctx->probelist, 1);
 238         g_free(ctx);
 239         o->internal = NULL;
 240
 241         return SR_OK;
 242 }
 243
 244 SR_PRIV struct sr_output_format output_analog = {
 245         .id = "analog",
 246         .description = "Analog data",
 247         .df_type = SR_DF_ANALOG,
 248         .init = init,
 249         .receive = receive,
 250         .cleanup = cleanup
 251 };