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                 case SR_UNIT_SECOND:
 129                         si_printf(value, out, "s");
 130                         break;
 131                 case SR_UNIT_SIEMENS:
 132                         si_printf(value, out, "S");
 133                         break;
 134         }
 135         if ((mqflags & (SR_MQFLAG_AC | SR_MQFLAG_DC)) == (SR_MQFLAG_AC | SR_MQFLAG_DC))
 136                 g_string_append_printf(out, " AC+DC");
 137         else if (mqflags & SR_MQFLAG_AC)
 138                 g_string_append_printf(out, " AC");
 139         else if (mqflags & SR_MQFLAG_DC)
 140                 g_string_append_printf(out, " DC");
 141         g_string_append_c(out, '\n');
 142
 143 }
 144
 145 static GString *receive(struct sr_output *o, const struct sr_dev_inst *sdi,
 146                 struct sr_datafeed_packet *packet)
 147 {
 148         struct sr_datafeed_analog *analog;
 149         struct context *ctx;
 150         float *fdata;
 151         int i, j;
 152
 153         if (!o || !o->sdi)
 154                 return NULL;
 155         ctx = o->internal;
 156
 157         g_string_set_size(ctx->out, 0);
 158         switch (packet->type) {
 159         case SR_DF_HEADER:
 160                 break;
 161         case SR_DF_FRAME_BEGIN:
 162                 g_string_append_printf(ctx->out, "FRAME-BEGIN\n");
 163                 break;
 164         case SR_DF_FRAME_END:
 165                 g_string_append_printf(ctx->out, "FRAME-END\n");
 166                 break;
 167         case SR_DF_ANALOG:
 168                 analog = packet->payload;
 169                 fdata = (float *)analog->data;
 170                 for (i = 0; i < analog->num_samples; i++) {
 171                         for (j = 0; j < ctx->num_enabled_probes; j++) {
 172                                 g_string_append_printf(ctx->out, "%s: ",
 173                                                 (char *)g_ptr_array_index(ctx->probelist, j));
 174                                 fancyprint(analog->unit, analog->mqflags,
 175                                                 fdata[i + j], ctx->out);
 176                         }
 177                 }
 178                 break;
 179         }
 180
 181         return ctx->out;
 182 }
 183
 184 static int cleanup(struct sr_output *o)
 185 {
 186         struct context *ctx;
 187
 188         if (!o || !o->sdi)
 189                 return SR_ERR_ARG;
 190         ctx = o->internal;
 191
 192         g_ptr_array_free(ctx->probelist, 1);
 193         g_string_free(ctx->out, 1);
 194         g_free(ctx);
 195         o->internal = NULL;
 196
 197         return SR_OK;
 198 }
 199
 200
 201 SR_PRIV struct sr_output_format output_analog = {
 202         .id = "analog",
 203         .description = "Analog data",
 204         .df_type = SR_DF_ANALOG,
 205         .init = init,
 206         .recv = receive,
 207         .cleanup = cleanup
 208 };