2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2015 Stefan BrĂ¼ns <stefan.bruens@rwth-aachen.de>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/types.h>
28 #include <libsigrok/libsigrok.h>
29 #include "libsigrok-internal.h"
31 #define LOG_PREFIX "input/raw_analog"
33 /* How many bytes at a time to process and send to the session bus. */
34 #define CHUNK_SIZE 4096
35 #define DEFAULT_NUM_CHANNELS 1
36 #define DEFAULT_SAMPLERATE 0
43 struct sr_datafeed_packet packet;
44 struct sr_datafeed_analog analog;
45 struct sr_analog_encoding encoding;
46 struct sr_analog_meaning meaning;
47 struct sr_analog_spec spec;
50 struct sample_format {
51 const char const* fmt_name;
52 // same as struct sr_analog_encoding
56 gboolean is_bigendian;
59 static const struct sample_format const sample_formats[] =
61 { "S8", 1, TRUE, FALSE, FALSE },
62 { "U8", 1, FALSE, FALSE, FALSE },
63 { "S16_LE", 2, TRUE, FALSE, FALSE },
64 { "U16_LE", 2, FALSE, FALSE, FALSE },
65 { "S16_BE", 2, TRUE, FALSE, TRUE },
66 { "U16_BE", 2, FALSE, FALSE, TRUE },
67 { "S32_LE", 4, TRUE, FALSE, FALSE },
68 { "U32_LE", 4, FALSE, FALSE, FALSE },
69 { "S32_BE", 4, TRUE, FALSE, TRUE },
70 { "U32_BE", 4, FALSE, FALSE, TRUE },
71 { "FLOAT_LE", 4, TRUE, TRUE, FALSE },
72 { "FLOAT_BE", 4, TRUE, TRUE, TRUE },
73 { "FLOAT64_LE", 8, TRUE, TRUE, FALSE },
74 { "FLOAT64_BE", 8, TRUE, TRUE, TRUE },
77 static int parse_format_string(const char *format)
79 int num_formats = sizeof(sample_formats)/ sizeof(sample_formats[0]);
80 for (int i = 0; i < num_formats; i++) {
81 if (!strcmp(format, sample_formats[i].fmt_name))
88 static void init_context(struct context *inc, const struct sample_format *fmt, GSList *channels)
90 inc->packet.type = SR_DF_ANALOG;
91 inc->packet.payload = &inc->analog;
93 inc->analog.data = NULL;
94 inc->analog.num_samples = 0;
95 inc->analog.encoding = &inc->encoding;
96 inc->analog.meaning = &inc->meaning;
97 inc->analog.spec = &inc->spec;
99 inc->encoding.unitsize = fmt->unitsize;
100 inc->encoding.is_signed = fmt->is_signed;
101 inc->encoding.is_float = fmt->is_float;
102 inc->encoding.is_bigendian = fmt->is_bigendian;
103 inc->encoding.digits = 0;
104 inc->encoding.is_digits_decimal = TRUE;
105 inc->encoding.scale.p = 1;
106 inc->encoding.scale.q = 1;
107 inc->encoding.offset.p = 0;
108 inc->encoding.offset.q = 1;
111 inc->meaning.unit = 0;
112 inc->meaning.mqflags = 0;
113 inc->meaning.channels = channels;
115 inc->spec.spec_digits = 0;
118 static int init(struct sr_input *in, GHashTable *options)
126 num_channels = g_variant_get_int32(g_hash_table_lookup(options, "numchannels"));
127 if (num_channels < 1) {
128 sr_err("Invalid value for numchannels: must be at least 1.");
132 format = g_variant_get_string(g_hash_table_lookup(options, "format"), NULL);
133 if ((fmt_index = parse_format_string(format)) == -1) {
134 GString *formats = g_string_sized_new(200);
135 int num_formats = sizeof(sample_formats)/ sizeof(sample_formats[0]);
136 for (int i = 0; i < num_formats; i++)
137 g_string_append_printf(formats, "%s ", sample_formats[i].fmt_name);
138 sr_err("Invalid format '%s': must be one of: %s.",
139 format, formats->str);
140 g_string_free(formats, TRUE);
144 in->sdi = g_malloc0(sizeof(struct sr_dev_inst));
145 in->priv = inc = g_malloc0(sizeof(struct context));
147 for (int i = 0; i < num_channels; i++) {
148 snprintf(channelname, 8, "CH%d", i + 1);
149 sr_channel_new(in->sdi, i, SR_CHANNEL_ANALOG, TRUE, channelname);
152 inc->samplerate = g_variant_get_uint64(g_hash_table_lookup(options, "samplerate"));
153 inc->samplesize = sample_formats[fmt_index].unitsize * num_channels;
154 init_context(inc, &sample_formats[fmt_index], in->sdi->channels);
159 static int process_buffer(struct sr_input *in)
162 struct sr_datafeed_meta meta;
163 struct sr_datafeed_packet packet;
164 struct sr_config *src;
165 unsigned int offset, chunk_size;
169 std_session_send_df_header(in->sdi, LOG_PREFIX);
171 if (inc->samplerate) {
172 packet.type = SR_DF_META;
173 packet.payload = &meta;
174 src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(inc->samplerate));
175 meta.config = g_slist_append(NULL, src);
176 sr_session_send(in->sdi, &packet);
177 g_slist_free(meta.config);
184 /* Round down to the last channels * unitsize boundary. */
185 inc->analog.num_samples = CHUNK_SIZE / inc->samplesize;
186 chunk_size = inc->analog.num_samples * inc->samplesize;
189 while ((offset + chunk_size) < in->buf->len) {
190 inc->analog.data = in->buf->str + offset;
191 sr_session_send(in->sdi, &inc->packet);
192 offset += chunk_size;
195 inc->analog.num_samples = (in->buf->len - offset) / inc->samplesize;
196 chunk_size = inc->analog.num_samples * inc->samplesize;
197 if (chunk_size > 0) {
198 inc->analog.data = in->buf->str + offset;
199 sr_session_send(in->sdi, &inc->packet);
200 offset += chunk_size;
203 if ((unsigned int)offset < in->buf->len) {
205 * The incoming buffer wasn't processed completely. Stash
206 * the leftover data for next time.
208 g_string_erase(in->buf, 0, offset);
210 g_string_truncate(in->buf, 0);
216 static int receive(struct sr_input *in, GString *buf)
220 g_string_append_len(in->buf, buf->str, buf->len);
222 if (!in->sdi_ready) {
223 /* sdi is ready, notify frontend. */
224 in->sdi_ready = TRUE;
228 ret = process_buffer(in);
233 static int end(struct sr_input *in)
235 struct sr_datafeed_packet packet;
240 ret = process_buffer(in);
246 packet.type = SR_DF_END;
247 sr_session_send(in->sdi, &packet);
253 static struct sr_option options[] = {
254 { "numchannels", "Number of channels", "Number of channels", NULL, NULL },
255 { "samplerate", "Sample rate", "Sample rate", NULL, NULL },
256 { "format", "Format", "Numeric format", NULL, NULL },
260 static const struct sr_option *get_options(void)
262 int num_formats = sizeof(sample_formats)/ sizeof(sample_formats[0]);
263 if (!options[0].def) {
264 options[0].def = g_variant_ref_sink(g_variant_new_int32(DEFAULT_NUM_CHANNELS));
265 options[1].def = g_variant_ref_sink(g_variant_new_uint64(DEFAULT_SAMPLERATE));
266 options[2].def = g_variant_ref_sink(g_variant_new_string(sample_formats[0].fmt_name));
267 for (int i = 0; i < num_formats; i++) {
268 options[2].values = g_slist_append(options[2].values,
269 g_variant_ref_sink(g_variant_new_string(sample_formats[i].fmt_name)));
276 static void cleanup(struct sr_input *in)
281 g_variant_unref(options[0].def);
282 g_variant_unref(options[1].def);
283 g_variant_unref(options[2].def);
284 g_slist_free_full(options[2].values, (GDestroyNotify)g_variant_unref);
289 SR_PRIV struct sr_input_module input_raw_analog = {
291 .name = "RAW analog",
292 .desc = "analog signals without header",
293 .exts = (const char*[]){"raw", "bin", NULL},
294 .options = get_options,