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 "config.h"
  24 #include "libsigrok.h"
  25 #include "libsigrok-internal.h"
  26 #include <math.h>
  27
  28 struct context {
  29         int num_enabled_probes;
  30         GPtrArray *probelist;
  31         GString *out;
  32 };
  33
  34
  35 static int init(struct sr_output *o)
  36 {
  37         struct context *ctx;
  38         struct sr_probe *probe;
  39         GSList *l;
  40
  41         sr_spew("output/analog: initializing");
  42         if (!o || !o->sdi)
  43                 return SR_ERR_ARG;
  44
  45         if (!(ctx = g_try_malloc0(sizeof(struct context))))
  46                 return SR_ERR_MALLOC;
  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         }
 141         if ((mqflags & (SR_MQFLAG_AC | SR_MQFLAG_DC)) == (SR_MQFLAG_AC | SR_MQFLAG_DC))
 142                 g_string_append_printf(out, " AC+DC");
 143         else if (mqflags & SR_MQFLAG_AC)
 144                 g_string_append_printf(out, " AC");
 145         else if (mqflags & SR_MQFLAG_DC)
 146                 g_string_append_printf(out, " DC");
 147         g_string_append_c(out, '\n');
 148
 149 }
 150
 151 static GString *receive(struct sr_output *o, const struct sr_dev_inst *sdi,
 152                 struct sr_datafeed_packet *packet)
 153 {
 154         struct sr_datafeed_analog *analog;
 155         struct context *ctx;
 156         float *fdata;
 157         int i, j;
 158
 159         if (!o || !o->sdi)
 160                 return NULL;
 161         ctx = o->internal;
 162
 163         g_string_set_size(ctx->out, 0);
 164         switch (packet->type) {
 165         case SR_DF_HEADER:
 166                 break;
 167         case SR_DF_FRAME_BEGIN:
 168                 g_string_append_printf(ctx->out, "FRAME-BEGIN\n");
 169                 break;
 170         case SR_DF_FRAME_END:
 171                 g_string_append_printf(ctx->out, "FRAME-END\n");
 172                 break;
 173         case SR_DF_ANALOG:
 174                 analog = packet->payload;
 175                 fdata = (float *)analog->data;
 176                 for (i = 0; i < analog->num_samples; i++) {
 177                         for (j = 0; j < ctx->num_enabled_probes; j++) {
 178                                 g_string_append_printf(ctx->out, "%s: ",
 179                                                 (char *)g_ptr_array_index(ctx->probelist, j));
 180                                 fancyprint(analog->unit, analog->mqflags,
 181                                                 fdata[i + j], ctx->out);
 182                         }
 183                 }
 184                 break;
 185         }
 186
 187         return ctx->out;
 188 }
 189
 190 static int cleanup(struct sr_output *o)
 191 {
 192         struct context *ctx;
 193
 194         if (!o || !o->sdi)
 195                 return SR_ERR_ARG;
 196         ctx = o->internal;
 197
 198         g_ptr_array_free(ctx->probelist, 1);
 199         g_string_free(ctx->out, 1);
 200         g_free(ctx);
 201         o->internal = NULL;
 202
 203         return SR_OK;
 204 }
 205
 206
 207 SR_PRIV struct sr_output_format output_analog = {
 208         .id = "analog",
 209         .description = "Analog data",
 210         .df_type = SR_DF_ANALOG,
 211         .init = init,
 212         .recv = receive,
 213         .cleanup = cleanup
 214 };