output/hex.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 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
  26 #define LOG_PREFIX "output/hex"
  27
  28 #define DEFAULT_SAMPLES_PER_LINE 192
  29
  30 struct context {
  31         unsigned int num_enabled_channels;
  32         int samples_per_line;
  33         int bit_cnt;
  34         int spl_cnt;
  35         int trigger;
  36         uint64_t samplerate;
  37         int *channel_index;
  38         char **channel_names;
  39         char **line_values;
  40         uint8_t *sample_buf;
  41         gboolean header_done;
  42         GString **lines;
  43 };
  44
  45 static int init(struct sr_output *o)
  46 {
  47         struct context *ctx;
  48         struct sr_channel *ch;
  49         GSList *l;
  50         GHashTableIter iter;
  51         gpointer key, value;
  52         unsigned int i, j;
  53         int spl;
  54
  55         if (!o || !o->sdi)
  56                 return SR_ERR_ARG;
  57
  58         spl = DEFAULT_SAMPLES_PER_LINE;
  59         g_hash_table_iter_init(&iter, o->params);
  60         while (g_hash_table_iter_next(&iter, &key, &value)) {
  61                 if (!strcmp(key, "width")) {
  62                         if ((spl = strtoul(value, NULL, 10)) < 1) {
  63                                 sr_err("Invalid width.");
  64                                 return SR_ERR_ARG;
  65                         }
  66                 } else {
  67                         sr_err("Unknown parameter '%s'.", key);
  68                         return SR_ERR_ARG;
  69                 }
  70         }
  71
  72         ctx = g_malloc0(sizeof(struct context));
  73         o->internal = ctx;
  74         ctx->trigger = -1;
  75         ctx->samples_per_line = spl;
  76
  77         for (l = o->sdi->channels; l; l = l->next) {
  78                 ch = l->data;
  79                 if (ch->type != SR_CHANNEL_LOGIC)
  80                         continue;
  81                 if (!ch->enabled)
  82                         continue;
  83                 ctx->num_enabled_channels++;
  84         }
  85         ctx->channel_index = g_malloc(sizeof(int) * ctx->num_enabled_channels);
  86         ctx->channel_names = g_malloc(sizeof(char *) * ctx->num_enabled_channels);
  87         ctx->lines = g_malloc(sizeof(GString *) * ctx->num_enabled_channels);
  88         ctx->sample_buf = g_malloc(ctx->num_enabled_channels);
  89
  90         j = 0;
  91         for (i = 0, l = o->sdi->channels; l; l = l->next, i++) {
  92                 ch = l->data;
  93                 if (ch->type != SR_CHANNEL_LOGIC)
  94                         continue;
  95                 if (!ch->enabled)
  96                         continue;
  97                 ctx->channel_index[j] = ch->index;
  98                 ctx->channel_names[j] = ch->name;
  99                 ctx->lines[j] = g_string_sized_new(80);
 100                 ctx->sample_buf[j] = 0;
 101                 g_string_printf(ctx->lines[j], "%s:", ch->name);
 102                 j++;
 103         }
 104
 105         return SR_OK;
 106 }
 107
 108 static GString *gen_header(struct sr_output *o)
 109 {
 110         struct context *ctx;
 111         GVariant *gvar;
 112         GString *header;
 113         int num_channels;
 114         char *samplerate_s;
 115
 116         ctx = o->internal;
 117         if (ctx->samplerate == 0) {
 118                 if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
 119                                 &gvar) == SR_OK) {
 120                         ctx->samplerate = g_variant_get_uint64(gvar);
 121                         g_variant_unref(gvar);
 122                 }
 123         }
 124
 125         header = g_string_sized_new(512);
 126         g_string_printf(header, "%s\n", PACKAGE_STRING);
 127         num_channels = g_slist_length(o->sdi->channels);
 128         g_string_append_printf(header, "Acquisition with %d/%d channels",
 129                         ctx->num_enabled_channels, num_channels);
 130         if (ctx->samplerate != 0) {
 131                 samplerate_s = sr_samplerate_string(ctx->samplerate);
 132                 g_string_append_printf(header, " at %s", samplerate_s);
 133                 g_free(samplerate_s);
 134         }
 135         g_string_append_printf(header, "\n");
 136
 137         return header;
 138 }
 139
 140 static int receive(struct sr_output *o, const struct sr_datafeed_packet *packet,
 141                 GString **out)
 142 {
 143         const struct sr_datafeed_meta *meta;
 144         const struct sr_datafeed_logic *logic;
 145         const struct sr_config *src;
 146         GSList *l;
 147         struct context *ctx;
 148         int idx, pos, offset;
 149         uint64_t i, j;
 150         gchar *p;
 151
 152         *out = NULL;
 153         if (!o || !o->sdi)
 154                 return SR_ERR_ARG;
 155         if (!(ctx = o->internal))
 156                 return SR_ERR_ARG;
 157
 158         switch (packet->type) {
 159         case SR_DF_META:
 160                 meta = packet->payload;
 161                 for (l = meta->config; l; l = l->next) {
 162                         src = l->data;
 163                         if (src->key != SR_CONF_SAMPLERATE)
 164                                 continue;
 165                         ctx->samplerate = g_variant_get_uint64(src->data);
 166                 }
 167                 break;
 168         case SR_DF_TRIGGER:
 169                 ctx->trigger = ctx->spl_cnt;
 170                 break;
 171         case SR_DF_LOGIC:
 172                 if (!ctx->header_done) {
 173                         *out = gen_header(o);
 174                         ctx->header_done = TRUE;
 175                 } else
 176                         *out = g_string_sized_new(512);
 177
 178                 logic = packet->payload;
 179                 for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) {
 180                         ctx->spl_cnt++;
 181                         pos = ctx->spl_cnt & 7;
 182                         for (j = 0; j < ctx->num_enabled_channels; j++) {
 183                                 idx = ctx->channel_index[j];
 184                                 p = logic->data + i + idx / 8;
 185                                 ctx->sample_buf[j] <<= 1;
 186                                 if (*p & (1 << (idx % 8)))
 187                                         ctx->sample_buf[j] |= 1;
 188                                 if (ctx->spl_cnt && pos == 0) {
 189                                         /* Buffered a byte's worth, output hex. */
 190                                         g_string_append_printf(ctx->lines[j], "%.2x ",
 191                                                         ctx->sample_buf[j]);
 192                                         ctx->sample_buf[j] = 0;
 193                                 }
 194
 195                                 if (ctx->spl_cnt == ctx->samples_per_line) {
 196                                         /* Flush line buffers. */
 197                                         g_string_append_len(*out, ctx->lines[j]->str, ctx->lines[j]->len);
 198                                         g_string_append_c(*out, '\n');
 199                                         if (j == ctx->num_enabled_channels  - 1 && ctx->trigger > -1) {
 200                                                 offset = ctx->trigger + ctx->trigger / 8;
 201                                                 g_string_append_printf(*out, "T:%*s^ %d\n", offset, "", ctx->trigger);
 202                                                 ctx->trigger = -1;
 203                                         }
 204                                         g_string_printf(ctx->lines[j], "%s:", ctx->channel_names[j]);
 205                                 }
 206                         }
 207                         if (ctx->spl_cnt == ctx->samples_per_line)
 208                                 /* Line buffers were already flushed. */
 209                                 ctx->spl_cnt = 0;
 210                 }
 211                 break;
 212         case SR_DF_END:
 213                 if (ctx->spl_cnt) {
 214                         /* Line buffers need flushing. */
 215                         *out = g_string_sized_new(512);
 216                         for (i = 0; i < ctx->num_enabled_channels; i++) {
 217                                 if (ctx->spl_cnt & 7)
 218                                         g_string_append_printf(ctx->lines[i], "%.2x ",
 219                                                         ctx->sample_buf[i] << (8 - (ctx->spl_cnt & 7)));
 220                                 g_string_append_len(*out, ctx->lines[i]->str, ctx->lines[i]->len);
 221                                 g_string_append_c(*out, '\n');
 222                         }
 223                 }
 224                 break;
 225         }
 226
 227         return SR_OK;
 228 }
 229
 230 static int cleanup(struct sr_output *o)
 231 {
 232         struct context *ctx;
 233         unsigned int i;
 234
 235         if (!o)
 236                 return SR_ERR_ARG;
 237
 238         if (!(ctx = o->internal))
 239                 return SR_OK;
 240
 241         g_free(ctx->channel_index);
 242         g_free(ctx->sample_buf);
 243         g_free(ctx->channel_names);
 244         for (i = 0; i < ctx->num_enabled_channels; i++)
 245                 g_string_free(ctx->lines[i], TRUE);
 246         g_free(ctx->lines);
 247         g_free(ctx);
 248         o->internal = NULL;
 249
 250         return SR_OK;
 251 }
 252
 253 SR_PRIV struct sr_output_format output_hex = {
 254         .id = "hex",
 255         .description = "Hexadecimal",
 256         .init = init,
 257         .receive = receive,
 258         .cleanup = cleanup,
 259 };
 260