output/analog.c

   1 /*
   2  * This file is part of the sigrok 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 <glib.h>
  23 #include "libsigrok.h"
  24 #include "libsigrok-internal.h"
  25 #include <math.h>
  26
  27 struct context {
  28         int num_enabled_probes;
  29         GPtrArray *probelist;
  30         GString *out;
  31 };
  32
  33 static int init(struct sr_output *o)
  34 {
  35         struct context *ctx;
  36         struct sr_probe *probe;
  37         GSList *l;
  38
  39         sr_spew("output/analog: initializing");
  40         if (!o || !o->sdi)
  41                 return SR_ERR_ARG;
  42
  43         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
  44                 sr_err("output/analog: Context malloc failed.");
  45                 return SR_ERR_MALLOC;
  46         }
  47         o->internal = ctx;
  48
  49         /* Get the number of probes and their names. */
  50         ctx->probelist = g_ptr_array_new();
  51         for (l = o->sdi->probes; l; l = l->next) {
  52                 probe = l->data;
  53                 if (!probe || !probe->enabled)
  54                         continue;
  55                 g_ptr_array_add(ctx->probelist, probe->name);
  56                 ctx->num_enabled_probes++;
  57         }
  58
  59         ctx->out = g_string_sized_new(512);
  60
  61         return SR_OK;
  62 }
  63
  64 static void si_printf(float value, GString *out, char *unitstr)
  65 {
  66         float v;
  67
  68         if (signbit(value))
  69                 v = -(value);
  70         else
  71                 v = value;
  72
  73         if (v < 1e-12 || v > 1e+12)
  74                 g_string_append_printf(out, "%f %s", value, unitstr);
  75         else if (v > 1e+9)
  76                 g_string_append_printf(out, "%f G%s", value / 1e+9, unitstr);
  77         else if (v > 1e+6)
  78                 g_string_append_printf(out, "%f M%s", value / 1e+6, unitstr);
  79         else if (v > 1e+3)
  80                 g_string_append_printf(out, "%f k%s", value / 1e+3, unitstr);
  81         else if (v < 1e-9)
  82                 g_string_append_printf(out, "%f n%s", value * 1e+9, unitstr);
  83         else if (v < 1e-6)
  84                 g_string_append_printf(out, "%f u%s", value * 1e+6, unitstr);
  85         else if (v < 1e-3)
  86                 g_string_append_printf(out, "%f m%s", value * 1e+3, unitstr);
  87         else
  88                 g_string_append_printf(out, "%f %s", value, unitstr);
  89
  90 }
  91
  92 static void fancyprint(int unit, int mqflags, float value, GString *out)
  93 {
  94
  95         switch (unit) {
  96                 case SR_UNIT_VOLT:
  97                         si_printf(value, out, "V");
  98                         break;
  99                 case SR_UNIT_AMPERE:
 100                         si_printf(value, out, "A");
 101                         break;
 102                 case SR_UNIT_OHM:
 103                         si_printf(value, out, "");
 104                         g_string_append_unichar(out, 0x2126);
 105                         break;
 106                 case SR_UNIT_FARAD:
 107                         si_printf(value, out, "F");
 108                         break;
 109                 case SR_UNIT_KELVIN:
 110                         si_printf(value, out, "K");
 111                         break;
 112                 case SR_UNIT_CELSIUS:
 113                         si_printf(value, out, "");
 114                         g_string_append_unichar(out, 0x00b0);
 115                         g_string_append_c(out, 'C');
 116                         break;
 117                 case SR_UNIT_FAHRENHEIT:
 118                         si_printf(value, out, "");
 119                         g_string_append_unichar(out, 0x00b0);
 120                         g_string_append_c(out, 'F');
 121                         break;
 122                 case SR_UNIT_HERTZ:
 123                         si_printf(value, out, "Hz");
 124                         break;
 125                 case SR_UNIT_PERCENTAGE:
 126                         g_string_append_printf(out, "%f%%", value);
 127                         break;
 128                 case SR_UNIT_BOOLEAN:
 129                         if (value > 0)
 130                                 g_string_append_printf(out, "TRUE");
 131                         else
 132                                 g_string_append_printf(out, "FALSE");
 133                         break;
 134                 case SR_UNIT_SECOND:
 135                         si_printf(value, out, "s");
 136                         break;
 137                 case SR_UNIT_SIEMENS:
 138                         si_printf(value, out, "S");
 139                         break;
 140                 case SR_UNIT_DECIBEL_MW:
 141                         si_printf(value, out, "dBu");
 142                         break;
 143                 case SR_UNIT_DECIBEL_VOLT:
 144                         si_printf(value, out, "dBV");
 145                         break;
 146                 default:
 147                         si_printf(value, out, "");
 148         }
 149         if ((mqflags & (SR_MQFLAG_AC | SR_MQFLAG_DC)) == (SR_MQFLAG_AC | SR_MQFLAG_DC))
 150                 g_string_append_printf(out, " AC+DC");
 151         else if (mqflags & SR_MQFLAG_AC)
 152                 g_string_append_printf(out, " AC");
 153         else if (mqflags & SR_MQFLAG_DC)
 154                 g_string_append_printf(out, " DC");
 155         g_string_append_c(out, '\n');
 156
 157 }
 158
 159 static GString *receive(struct sr_output *o, const struct sr_dev_inst *sdi,
 160                 struct sr_datafeed_packet *packet)
 161 {
 162         struct sr_datafeed_analog *analog;
 163         struct context *ctx;
 164         float *fdata;
 165         int i, j;
 166
 167         (void)sdi;
 168         if (!o || !o->sdi)
 169                 return NULL;
 170         ctx = o->internal;
 171
 172         g_string_set_size(ctx->out, 0);
 173         switch (packet->type) {
 174         case SR_DF_HEADER:
 175                 break;
 176         case SR_DF_FRAME_BEGIN:
 177                 g_string_append_printf(ctx->out, "FRAME-BEGIN\n");
 178                 break;
 179         case SR_DF_FRAME_END:
 180                 g_string_append_printf(ctx->out, "FRAME-END\n");
 181                 break;
 182         case SR_DF_ANALOG:
 183                 analog = packet->payload;
 184                 fdata = (float *)analog->data;
 185                 for (i = 0; i < analog->num_samples; i++) {
 186                         for (j = 0; j < ctx->num_enabled_probes; j++) {
 187                                 g_string_append_printf(ctx->out, "%s: ",
 188                                                 (char *)g_ptr_array_index(ctx->probelist, j));
 189                                 fancyprint(analog->unit, analog->mqflags,
 190                                                 fdata[i + j], ctx->out);
 191                         }
 192                 }
 193                 break;
 194         }
 195
 196         return ctx->out;
 197 }
 198
 199 static int cleanup(struct sr_output *o)
 200 {
 201         struct context *ctx;
 202
 203         if (!o || !o->sdi)
 204                 return SR_ERR_ARG;
 205         ctx = o->internal;
 206
 207         g_ptr_array_free(ctx->probelist, 1);
 208         g_string_free(ctx->out, 1);
 209         g_free(ctx);
 210         o->internal = NULL;
 211
 212         return SR_OK;
 213 }
 214
 215
 216 SR_PRIV struct sr_output_format output_analog = {
 217         .id = "analog",
 218         .description = "Analog data",
 219         .df_type = SR_DF_ANALOG,
 220         .init = init,
 221         .recv = receive,
 222         .cleanup = cleanup
 223 };