src/input/chronovu_la8.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de>
   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 2 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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <stdlib.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <sys/stat.h>
  25 #include "libsigrok.h"
  26 #include "libsigrok-internal.h"
  27
  28 #define LOG_PREFIX "input/chronovu-la8"
  29
  30 #define DEFAULT_NUM_CHANNELS    8
  31 #define DEFAULT_SAMPLERATE      100000000L
  32 #define MAX_CHUNK_SIZE          4096
  33 #define CHRONOVU_LA8_FILESIZE   8 * 1024 * 1024 + 5
  34
  35 struct context {
  36         gboolean started;
  37         uint64_t samplerate;
  38 };
  39
  40 static int format_match(GHashTable *metadata)
  41 {
  42         int size;
  43
  44         size = GPOINTER_TO_INT(g_hash_table_lookup(metadata,
  45                         GINT_TO_POINTER(SR_INPUT_META_FILESIZE)));
  46         if (size == CHRONOVU_LA8_FILESIZE)
  47                 return SR_OK;
  48
  49         return SR_ERR;
  50 }
  51
  52 static int init(struct sr_input *in, GHashTable *options)
  53 {
  54         struct sr_channel *ch;
  55         struct context *inc;
  56         int num_channels, i;
  57         char name[16];
  58
  59         num_channels = g_variant_get_int32(g_hash_table_lookup(options, "numchannels"));
  60         if (num_channels < 1) {
  61                 sr_err("Invalid value for numchannels: must be at least 1.");
  62                 return SR_ERR_ARG;
  63         }
  64
  65         in->sdi = sr_dev_inst_new(SR_ST_ACTIVE, NULL, NULL, NULL);
  66         in->priv = inc = g_malloc0(sizeof(struct context));
  67
  68         inc->samplerate = g_variant_get_uint64(g_hash_table_lookup(options, "samplerate"));
  69
  70         for (i = 0; i < num_channels; i++) {
  71                 snprintf(name, 16, "%d", i);
  72                 ch = sr_channel_new(i, SR_CHANNEL_LOGIC, TRUE, name);
  73                 in->sdi->channels = g_slist_append(in->sdi->channels, ch);
  74         }
  75
  76         return SR_OK;
  77 }
  78
  79 static int receive(const struct sr_input *in, GString *buf)
  80 {
  81         struct sr_datafeed_packet packet;
  82         struct sr_datafeed_meta meta;
  83         struct sr_datafeed_logic logic;
  84         struct sr_config *src;
  85         struct context *inc;
  86         gsize chunk_size, i;
  87         int chunk, num_channels;
  88
  89         inc = in->priv;
  90
  91         g_string_append_len(in->buf, buf->str, buf->len);
  92
  93         num_channels = g_slist_length(in->sdi->channels);
  94
  95         if (!inc->started) {
  96                 std_session_send_df_header(in->sdi, LOG_PREFIX);
  97                 inc->started = TRUE;
  98
  99                 packet.type = SR_DF_META;
 100                 packet.payload = &meta;
 101                 src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(inc->samplerate));
 102                 meta.config = g_slist_append(NULL, src);
 103                 sr_session_send(in->sdi, &packet);
 104                 sr_config_free(src);
 105         }
 106
 107         packet.type = SR_DF_LOGIC;
 108         packet.payload = &logic;
 109         logic.unitsize = (num_channels + 7) / 8;
 110
 111         /* Cut off at multiple of unitsize. */
 112         chunk_size = in->buf->len / logic.unitsize * logic.unitsize;
 113
 114         chunk = 0;
 115         for (i = 0; i < chunk_size; i += chunk) {
 116                 logic.data = in->buf->str + i;
 117                 chunk = MIN(MAX_CHUNK_SIZE, chunk_size - i);
 118                 logic.length = chunk;
 119                 sr_session_send(in->sdi, &packet);
 120         }
 121         g_string_erase(in->buf, 0, chunk_size);
 122
 123         return SR_OK;
 124 }
 125
 126 static int cleanup(struct sr_input *in)
 127 {
 128         struct sr_datafeed_packet packet;
 129         struct context *inc;
 130
 131         inc = in->priv;
 132
 133         if (inc->started) {
 134                 packet.type = SR_DF_END;
 135                 sr_session_send(in->sdi, &packet);
 136         }
 137         g_free(in->priv);
 138         in->priv = NULL;
 139
 140         return SR_OK;
 141 }
 142
 143 static struct sr_option options[] = {
 144         { "numchannels", "Number of channels", "Number of channels", NULL, NULL },
 145         { "samplerate", "Sample rate", "Sample rate", NULL, NULL },
 146         ALL_ZERO
 147 };
 148
 149 static struct sr_option *get_options(void)
 150 {
 151         if (!options[0].def) {
 152                 options[0].def = g_variant_ref_sink(g_variant_new_int32(DEFAULT_NUM_CHANNELS));
 153                 options[1].def = g_variant_ref_sink(g_variant_new_uint64(DEFAULT_SAMPLERATE));
 154         }
 155
 156         return options;
 157 }
 158
 159 SR_PRIV struct sr_input_module input_chronovu_la8 = {
 160         .id = "chronovu-la8",
 161         .name = "Chronovu-LA8",
 162         .desc = "ChronoVu LA8",
 163         .metadata = { SR_INPUT_META_FILESIZE | SR_INPUT_META_REQUIRED },
 164         .options = get_options,
 165         .format_match = format_match,
 166         .init = init,
 167         .receive = receive,
 168         .cleanup = cleanup,
 169 };