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
  67         if (value > 1000000000L)
  68                 g_string_append_printf(out, "%f G%s", value / 1000000000L, unitstr);
  69         else if (value > 1000000)
  70                 g_string_append_printf(out, "%f M%s", value / 1000000, unitstr);
  71         else if (value > 1000)
  72                 g_string_append_printf(out, "%f k%s", value / 1000, unitstr);
  73         else if (value < 0.000000000001)
  74                 g_string_append_printf(out, "%f p%s", value * 1000000000000, unitstr);
  75         else if (value < 0.000000001)
  76                 g_string_append_printf(out, "%f n%s", value * 1000000000, unitstr);
  77         else if (value < 0.000001)
  78                 g_string_append_printf(out, "%f u%s", value * 1000000, unitstr);
  79         else if (value < 0.001)
  80                 g_string_append_printf(out, "%f m%s", value * 1000, unitstr);
  81         else
  82                 g_string_append_printf(out, "%f %s", value, unitstr);
  83
  84 }
  85
  86 static void fancyprint(int unit, int mqflags, float value, GString *out)
  87 {
  88
  89         switch (unit) {
  90                 case SR_UNIT_VOLT:
  91                         si_printf(value, out, "V");
  92                         break;
  93                 case SR_UNIT_AMPERE:
  94                         si_printf(value, out, "A");
  95                         break;
  96                 case SR_UNIT_OHM:
  97                         si_printf(value, out, "");
  98                         g_string_append_unichar(out, 0x2126);
  99                         break;
 100                 case SR_UNIT_FARAD:
 101                         si_printf(value, out, "F");
 102                         break;
 103                 case SR_UNIT_KELVIN:
 104                         si_printf(value, out, "K");
 105                         break;
 106                 case SR_UNIT_CELSIUS:
 107                         si_printf(value, out, "");
 108                         g_string_append_unichar(out, 0x00b0);
 109                         g_string_append_c(out, 'C');
 110                         break;
 111                 case SR_UNIT_FAHRENHEIT:
 112                         si_printf(value, out, "");
 113                         g_string_append_unichar(out, 0x00b0);
 114                         g_string_append_c(out, 'F');
 115                         break;
 116                 case SR_UNIT_HERTZ:
 117                         si_printf(value, out, "Hz");
 118                         break;
 119                 case SR_UNIT_PERCENTAGE:
 120                         g_string_append_printf(out, "%f%%", value);
 121                         break;
 122                 case SR_UNIT_BOOLEAN:
 123                         if (value > 0)
 124                                 g_string_append_printf(out, "TRUE");
 125                         else
 126                                 g_string_append_printf(out, "FALSE");
 127                         break;
 128         }
 129         if (mqflags & SR_MQFLAG_AC)
 130                 g_string_append_printf(out, " AC");
 131         else if (mqflags & SR_MQFLAG_DC)
 132                 g_string_append_printf(out, " DC");
 133         g_string_append_c(out, '\n');
 134
 135 }
 136
 137 static GString *recv(struct sr_output *o, const struct sr_dev_inst *sdi,
 138                 struct sr_datafeed_packet *packet)
 139 {
 140         struct sr_datafeed_analog *analog;
 141         struct context *ctx;
 142         float *fdata;
 143         int i, j;
 144
 145         if (!o || !o->sdi)
 146                 return NULL;
 147         ctx = o->internal;
 148
 149         g_string_set_size(ctx->out, 0);
 150         switch (packet->type) {
 151         case SR_DF_HEADER:
 152                 break;
 153         case SR_DF_FRAME_BEGIN:
 154                 g_string_append_printf(ctx->out, "FRAME-BEGIN\n");
 155                 break;
 156         case SR_DF_FRAME_END:
 157                 g_string_append_printf(ctx->out, "FRAME-END\n");
 158                 break;
 159         case SR_DF_ANALOG:
 160                 analog = packet->payload;
 161                 fdata = (float *)analog->data;
 162                 for (i = 0; i < analog->num_samples; i++) {
 163                         for (j = 0; j < ctx->num_enabled_probes; j++) {
 164                                 g_string_append_printf(ctx->out, "%s: ",
 165                                                 (char *)g_ptr_array_index(ctx->probelist, j));
 166                                 fancyprint(analog->unit, analog->mqflags,
 167                                                 fdata[i + j], ctx->out);
 168                         }
 169                 }
 170                 break;
 171         }
 172
 173         return ctx->out;
 174 }
 175
 176 static int cleanup(struct sr_output *o)
 177 {
 178         struct context *ctx;
 179
 180         if (!o || !o->sdi)
 181                 return SR_ERR_ARG;
 182         ctx = o->internal;
 183
 184         g_ptr_array_free(ctx->probelist, 1);
 185         g_string_free(ctx->out, 1);
 186         g_free(ctx);
 187         o->internal = NULL;
 188
 189         return SR_OK;
 190 }
 191
 192
 193 SR_PRIV struct sr_output_format output_analog = {
 194         .id = "analog",
 195         .description = "Analog data",
 196         .df_type = SR_DF_ANALOG,
 197         .init = init,
 198         .recv = recv,
 199         .cleanup = cleanup
 200 };