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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Petteri Aimonen <jpa@sr.mail.kapsi.fi> | |
5 | * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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/>. | |
19 | */ | |
20 | ||
21 | /* The VCD input module has the following options: | |
22 | * | |
23 | * numchannels: Maximum number of channels to use. The channels are | |
24 | * detected in the same order as they are listed | |
25 | * in the $var sections of the VCD file. | |
26 | * | |
27 | * skip: Allows skipping until given timestamp in the file. | |
28 | * This can speed up analyzing of long captures. | |
29 | * | |
30 | * Value < 0: Skip until first timestamp listed in | |
31 | * the file. (default) | |
32 | * | |
33 | * Value = 0: Do not skip, instead generate samples | |
34 | * beginning from timestamp 0. | |
35 | * | |
36 | * Value > 0: Start at the given timestamp. | |
37 | * | |
38 | * downsample: Divide the samplerate by the given factor. | |
39 | * This can speed up analyzing of long captures. | |
40 | * | |
41 | * compress: Compress idle periods longer than this value. | |
42 | * This can speed up analyzing of long captures. | |
43 | * Default 0 = don't compress. | |
44 | * | |
45 | * Based on Verilog standard IEEE Std 1364-2001 Version C | |
46 | * | |
47 | * Supported features: | |
48 | * - $var with 'wire' and 'reg' types of scalar variables | |
49 | * - $timescale definition for samplerate | |
50 | * - multiple character variable identifiers | |
51 | * | |
52 | * Most important unsupported features: | |
53 | * - vector variables (bit vectors etc.) | |
54 | * - analog, integer and real number variables | |
55 | * - $dumpvars initial value declaration | |
56 | * - $scope namespaces | |
57 | * - more than 64 channels | |
58 | */ | |
59 | ||
60 | #include <stdlib.h> | |
61 | #include <glib.h> | |
62 | #include <stdio.h> | |
63 | #include <string.h> | |
64 | #include "libsigrok.h" | |
65 | #include "libsigrok-internal.h" | |
66 | ||
67 | #define LOG_PREFIX "input/vcd" | |
68 | ||
69 | #define DEFAULT_NUM_CHANNELS 8 | |
70 | #define CHUNKSIZE 1024 | |
71 | ||
72 | struct context { | |
73 | gboolean started; | |
74 | gboolean got_header; | |
75 | uint64_t samplerate; | |
76 | unsigned int maxchannels; | |
77 | unsigned int channelcount; | |
78 | int downsample; | |
79 | unsigned compress; | |
80 | int64_t skip; | |
81 | gboolean skip_until_end; | |
82 | GSList *channels; | |
83 | }; | |
84 | ||
85 | struct vcd_channel { | |
86 | gchar *name; | |
87 | gchar *identifier; | |
88 | }; | |
89 | ||
90 | ||
91 | /* | |
92 | * Reads a single VCD section from input file and parses it to name/contents. | |
93 | * e.g. $timescale 1ps $end => "timescale" "1ps" | |
94 | */ | |
95 | static gboolean parse_section(GString *buf, gchar **name, gchar **contents) | |
96 | { | |
97 | GString *sname, *scontent; | |
98 | gboolean status; | |
99 | unsigned int pos; | |
100 | ||
101 | *name = *contents = NULL; | |
102 | status = FALSE; | |
103 | pos = 0; | |
104 | ||
105 | /* Skip any initial white-space. */ | |
106 | while (pos < buf->len && g_ascii_isspace(buf->str[pos])) | |
107 | pos++; | |
108 | ||
109 | /* Section tag should start with $. */ | |
110 | if (buf->str[pos++] != '$') | |
111 | return FALSE; | |
112 | ||
113 | sname = g_string_sized_new(32); | |
114 | scontent = g_string_sized_new(128); | |
115 | ||
116 | /* Read the section tag. */ | |
117 | while (pos < buf->len && !g_ascii_isspace(buf->str[pos])) | |
118 | g_string_append_c(sname, buf->str[pos++]); | |
119 | ||
120 | /* Skip whitespace before content. */ | |
121 | while (pos < buf->len && g_ascii_isspace(buf->str[pos])) | |
122 | pos++; | |
123 | ||
124 | /* Read the content. */ | |
125 | while (pos < buf->len - 4 && strncmp(buf->str + pos, "$end", 4)) | |
126 | g_string_append_c(scontent, buf->str[pos++]); | |
127 | ||
128 | if (sname->len && pos < buf->len - 4 && !strncmp(buf->str + pos, "$end", 4)) { | |
129 | status = TRUE; | |
130 | pos += 4; | |
131 | while (pos < buf->len && g_ascii_isspace(buf->str[pos])) | |
132 | pos++; | |
133 | g_string_erase(buf, 0, pos); | |
134 | } | |
135 | ||
136 | *name = g_string_free(sname, !status); | |
137 | *contents = g_string_free(scontent, !status); | |
138 | if (*contents) | |
139 | g_strchomp(*contents); | |
140 | ||
141 | return status; | |
142 | } | |
143 | ||
144 | static void free_channel(void *data) | |
145 | { | |
146 | struct vcd_channel *vcd_ch = data; | |
147 | g_free(vcd_ch->name); | |
148 | g_free(vcd_ch->identifier); | |
149 | g_free(vcd_ch); | |
150 | } | |
151 | ||
152 | /* Remove empty parts from an array returned by g_strsplit. */ | |
153 | static void remove_empty_parts(gchar **parts) | |
154 | { | |
155 | gchar **src = parts; | |
156 | gchar **dest = parts; | |
157 | while (*src != NULL) { | |
158 | if (**src != '\0') | |
159 | *dest++ = *src; | |
160 | src++; | |
161 | } | |
162 | ||
163 | *dest = NULL; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Parse VCD header to get values for context structure. | |
168 | * The context structure should be zeroed before calling this. | |
169 | */ | |
170 | static gboolean parse_header(const struct sr_input *in, GString *buf) | |
171 | { | |
172 | struct vcd_channel *vcd_ch; | |
173 | uint64_t p, q; | |
174 | struct context *inc; | |
175 | gboolean status; | |
176 | gchar *name, *contents, **parts; | |
177 | ||
178 | inc = in->priv; | |
179 | name = contents = NULL; | |
180 | status = FALSE; | |
181 | while (parse_section(buf, &name, &contents)) { | |
182 | sr_dbg("Section '%s', contents '%s'.", name, contents); | |
183 | ||
184 | if (g_strcmp0(name, "enddefinitions") == 0) { | |
185 | status = TRUE; | |
186 | break; | |
187 | } else if (g_strcmp0(name, "timescale") == 0) { | |
188 | /* | |
189 | * The standard allows for values 1, 10 or 100 | |
190 | * and units s, ms, us, ns, ps and fs. | |
191 | */ | |
192 | if (sr_parse_period(contents, &p, &q) == SR_OK) { | |
193 | inc->samplerate = q / p; | |
194 | if (q % p != 0) { | |
195 | /* Does not happen unless time value is non-standard */ | |
196 | sr_warn("Inexact rounding of samplerate, %" PRIu64 " / %" PRIu64 " to %" PRIu64 " Hz.", | |
197 | q, p, inc->samplerate); | |
198 | } | |
199 | ||
200 | sr_dbg("Samplerate: %" PRIu64, inc->samplerate); | |
201 | } else { | |
202 | sr_err("Parsing timescale failed."); | |
203 | } | |
204 | } else if (g_strcmp0(name, "var") == 0) { | |
205 | /* Format: $var type size identifier reference $end */ | |
206 | parts = g_strsplit_set(contents, " \r\n\t", 0); | |
207 | remove_empty_parts(parts); | |
208 | ||
209 | if (g_strv_length(parts) != 4) | |
210 | sr_warn("$var section should have 4 items"); | |
211 | else if (g_strcmp0(parts[0], "reg") != 0 && g_strcmp0(parts[0], "wire") != 0) | |
212 | sr_info("Unsupported signal type: '%s'", parts[0]); | |
213 | else if (strtol(parts[1], NULL, 10) != 1) | |
214 | sr_info("Unsupported signal size: '%s'", parts[1]); | |
215 | else if (inc->channelcount >= inc->maxchannels) | |
216 | sr_warn("Skipping '%s' because only %d channels requested.", | |
217 | parts[3], inc->maxchannels); | |
218 | else { | |
219 | sr_info("Channel %d is '%s' identified by '%s'.", | |
220 | inc->channelcount, parts[3], parts[2]); | |
221 | vcd_ch = g_malloc(sizeof(struct vcd_channel)); | |
222 | vcd_ch->identifier = g_strdup(parts[2]); | |
223 | vcd_ch->name = g_strdup(parts[3]); | |
224 | inc->channels = g_slist_append(inc->channels, vcd_ch); | |
225 | inc->channelcount++; | |
226 | } | |
227 | ||
228 | g_strfreev(parts); | |
229 | } | |
230 | ||
231 | g_free(name); name = NULL; | |
232 | g_free(contents); contents = NULL; | |
233 | } | |
234 | g_free(name); | |
235 | g_free(contents); | |
236 | ||
237 | inc->got_header = status; | |
238 | ||
239 | return status; | |
240 | } | |
241 | ||
242 | static int format_match(GHashTable *metadata) | |
243 | { | |
244 | GString *buf, *tmpbuf; | |
245 | gboolean status; | |
246 | gchar *name, *contents; | |
247 | ||
248 | buf = g_hash_table_lookup(metadata, GINT_TO_POINTER(SR_INPUT_META_HEADER)); | |
249 | tmpbuf = g_string_new_len(buf->str, buf->len); | |
250 | ||
251 | /* | |
252 | * If we can parse the first section correctly, | |
253 | * then it is assumed to be a VCD file. | |
254 | */ | |
255 | status = parse_section(tmpbuf, &name, &contents); | |
256 | g_string_free(tmpbuf, TRUE); | |
257 | g_free(name); | |
258 | g_free(contents); | |
259 | ||
260 | return status ? SR_OK : SR_ERR; | |
261 | } | |
262 | ||
263 | /* Send N samples of the given value. */ | |
264 | static void send_samples(const struct sr_dev_inst *sdi, uint64_t sample, uint64_t count) | |
265 | { | |
266 | struct sr_datafeed_packet packet; | |
267 | struct sr_datafeed_logic logic; | |
268 | uint64_t buffer[CHUNKSIZE]; | |
269 | uint64_t i; | |
270 | unsigned chunksize = CHUNKSIZE; | |
271 | ||
272 | if (count < chunksize) | |
273 | chunksize = count; | |
274 | ||
275 | for (i = 0; i < chunksize; i++) | |
276 | buffer[i] = sample; | |
277 | ||
278 | packet.type = SR_DF_LOGIC; | |
279 | packet.payload = &logic; | |
280 | logic.unitsize = sizeof(uint64_t); | |
281 | logic.data = buffer; | |
282 | ||
283 | while (count) { | |
284 | if (count < chunksize) | |
285 | chunksize = count; | |
286 | ||
287 | logic.length = sizeof(uint64_t) * chunksize; | |
288 | ||
289 | sr_session_send(sdi, &packet); | |
290 | count -= chunksize; | |
291 | } | |
292 | } | |
293 | ||
294 | /* Parse a set of lines from the data section. */ | |
295 | static void parse_contents(const struct sr_input *in, char *data) | |
296 | { | |
297 | struct context *inc; | |
298 | struct vcd_channel *vcd_ch; | |
299 | GSList *l; | |
300 | uint64_t timestamp, prev_timestamp, prev_values; | |
301 | unsigned int bit, i, j; | |
302 | char **tokens; | |
303 | ||
304 | inc = in->priv; | |
305 | prev_timestamp = prev_values = 0; | |
306 | ||
307 | /* Read one space-delimited token at a time. */ | |
308 | tokens = g_strsplit_set(data, " \t\r\n", 0); | |
309 | remove_empty_parts(tokens); | |
310 | for (i = 0; tokens[i]; i++) { | |
311 | if (inc->skip_until_end) { | |
312 | if (!strcmp(tokens[i], "$end")) { | |
313 | /* Done with unhandled/unknown section. */ | |
314 | inc->skip_until_end = FALSE; | |
315 | break; | |
316 | } | |
317 | } | |
318 | if (tokens[i][0] == '#' && g_ascii_isdigit(tokens[i][1])) { | |
319 | /* Numeric value beginning with # is a new timestamp value */ | |
320 | timestamp = strtoull(tokens[i] + 1, NULL, 10); | |
321 | ||
322 | if (inc->downsample > 1) | |
323 | timestamp /= inc->downsample; | |
324 | ||
325 | /* | |
326 | * Skip < 0 => skip until first timestamp. | |
327 | * Skip = 0 => don't skip | |
328 | * Skip > 0 => skip until timestamp >= skip. | |
329 | */ | |
330 | if (inc->skip < 0) { | |
331 | inc->skip = timestamp; | |
332 | prev_timestamp = timestamp; | |
333 | } else if (inc->skip > 0 && timestamp < (uint64_t)inc->skip) { | |
334 | prev_timestamp = inc->skip; | |
335 | } else if (timestamp == prev_timestamp) { | |
336 | /* Ignore repeated timestamps (e.g. sigrok outputs these) */ | |
337 | } else { | |
338 | if (inc->compress != 0 && timestamp - prev_timestamp > inc->compress) { | |
339 | /* Compress long idle periods */ | |
340 | prev_timestamp = timestamp - inc->compress; | |
341 | } | |
342 | ||
343 | sr_dbg("New timestamp: %" PRIu64, timestamp); | |
344 | ||
345 | /* Generate samples from prev_timestamp up to timestamp - 1. */ | |
346 | send_samples(in->sdi, prev_values, timestamp - prev_timestamp); | |
347 | prev_timestamp = timestamp; | |
348 | } | |
349 | } else if (tokens[i][0] == '$' && tokens[i][1] != '\0') { | |
350 | /* | |
351 | * This is probably a $dumpvars, $comment or similar. | |
352 | * $dump* contain useful data. | |
353 | */ | |
354 | if (g_strcmp0(tokens[i], "$dumpvars") == 0 | |
355 | || g_strcmp0(tokens[i], "$dumpon") == 0 | |
356 | || g_strcmp0(tokens[i], "$dumpoff") == 0 | |
357 | || g_strcmp0(tokens[i], "$end") == 0) { | |
358 | /* Ignore, parse contents as normally. */ | |
359 | } else { | |
360 | /* Ignore this and future lines until $end. */ | |
361 | inc->skip_until_end = TRUE; | |
362 | break; | |
363 | } | |
364 | } else if (strchr("bBrR", tokens[i][0]) != NULL) { | |
365 | /* A vector value, not supported yet. */ | |
366 | break; | |
367 | } else if (strchr("01xXzZ", tokens[i][0]) != NULL) { | |
368 | /* A new 1-bit sample value */ | |
369 | bit = (tokens[i][0] == '1'); | |
370 | ||
371 | /* | |
372 | * The identifier is either the next character, or, if | |
373 | * there was whitespace after the bit, the next token. | |
374 | */ | |
375 | if (tokens[i][1] == '\0') { | |
376 | if (!tokens[++i]) | |
377 | /* Missing identifier */ | |
378 | continue; | |
379 | } else { | |
380 | for (j = 1; tokens[i][j]; j++) | |
381 | tokens[i][j - 1] = tokens[i][j]; | |
382 | tokens[i][j - 1] = '\0'; | |
383 | } | |
384 | ||
385 | for (j = 0, l = inc->channels; j < inc->channelcount && l; j++, l = l->next) { | |
386 | vcd_ch = l->data; | |
387 | if (g_strcmp0(tokens[i], vcd_ch->identifier) == 0) { | |
388 | /* Found our channel */ | |
389 | if (bit) | |
390 | prev_values |= (uint64_t)1 << j; | |
391 | else | |
392 | prev_values &= ~((uint64_t)1 << j); | |
393 | break; | |
394 | } | |
395 | } | |
396 | if (j == inc->channelcount) | |
397 | sr_dbg("Did not find channel for identifier '%s'.", tokens[i]); | |
398 | } else { | |
399 | sr_warn("Skipping unknown token '%s'.", tokens[i]); | |
400 | } | |
401 | } | |
402 | g_strfreev(tokens); | |
403 | } | |
404 | ||
405 | static int init(struct sr_input *in, GHashTable *options) | |
406 | { | |
407 | struct sr_channel *ch; | |
408 | int num_channels, i; | |
409 | char name[16]; | |
410 | struct context *inc; | |
411 | ||
412 | inc = g_malloc0(sizeof(struct context)); | |
413 | ||
414 | num_channels = g_variant_get_int32(g_hash_table_lookup(options, "numchannels")); | |
415 | if (num_channels < 1) { | |
416 | sr_err("Invalid value for numchannels: must be at least 1."); | |
417 | return SR_ERR_ARG; | |
418 | } | |
419 | if (num_channels > 64) { | |
420 | sr_err("No more than 64 channels supported."); | |
421 | return SR_ERR_ARG; | |
422 | } | |
423 | inc->maxchannels = num_channels; | |
424 | ||
425 | inc->downsample = g_variant_get_int32(g_hash_table_lookup(options, "downsample")); | |
426 | if (inc->downsample < 1) | |
427 | inc->downsample = 1; | |
428 | ||
429 | inc->compress = g_variant_get_int32(g_hash_table_lookup(options, "compress")); | |
430 | inc->skip = g_variant_get_int32(g_hash_table_lookup(options, "skip")); | |
431 | inc->skip /= inc->downsample; | |
432 | ||
433 | in->sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, NULL, NULL, NULL); | |
434 | in->priv = inc; | |
435 | ||
436 | for (i = 0; i < num_channels; i++) { | |
437 | snprintf(name, 16, "%d", i); | |
438 | ch = sr_channel_new(i, SR_CHANNEL_LOGIC, TRUE, name); | |
439 | in->sdi->channels = g_slist_append(in->sdi->channels, ch); | |
440 | } | |
441 | ||
442 | return SR_OK; | |
443 | } | |
444 | ||
445 | static gboolean have_header(GString *buf) | |
446 | { | |
447 | unsigned int pos; | |
448 | char *p; | |
449 | ||
450 | if (!(p = g_strstr_len(buf->str, buf->len, "$enddefinitions"))) | |
451 | return FALSE; | |
452 | pos = p - buf->str + 15; | |
453 | while (pos < buf->len - 4 && g_ascii_isspace(buf->str[pos])) | |
454 | pos++; | |
455 | if (!strncmp(buf->str + pos, "$end", 4)) | |
456 | return TRUE; | |
457 | ||
458 | return FALSE; | |
459 | } | |
460 | ||
461 | static int receive(const struct sr_input *in, GString *buf) | |
462 | { | |
463 | struct sr_datafeed_packet packet; | |
464 | struct sr_datafeed_meta meta; | |
465 | struct sr_config *src; | |
466 | struct context *inc; | |
467 | uint64_t samplerate; | |
468 | char *p; | |
469 | ||
470 | g_string_append_len(in->buf, buf->str, buf->len); | |
471 | ||
472 | inc = in->priv; | |
473 | if (!inc->got_header) { | |
474 | if (!have_header(in->buf)) | |
475 | return SR_OK; | |
476 | if (!parse_header(in, in->buf) != SR_OK) | |
477 | /* There was a header in there, but it was malformed. */ | |
478 | return SR_ERR; | |
479 | ||
480 | std_session_send_df_header(in->sdi, LOG_PREFIX); | |
481 | inc->started = TRUE; | |
482 | ||
483 | packet.type = SR_DF_META; | |
484 | packet.payload = &meta; | |
485 | samplerate = inc->samplerate / inc->downsample; | |
486 | src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(samplerate)); | |
487 | meta.config = g_slist_append(NULL, src); | |
488 | sr_session_send(in->sdi, &packet); | |
489 | sr_config_free(src); | |
490 | } | |
491 | ||
492 | while ((p = g_strrstr_len(in->buf->str, in->buf->len, "\n"))) { | |
493 | *p = '\0'; | |
494 | g_strstrip(in->buf->str); | |
495 | if (in->buf->str[0] != '\0') | |
496 | parse_contents(in, in->buf->str); | |
497 | g_string_erase(in->buf, 0, p - in->buf->str + 1); | |
498 | } | |
499 | ||
500 | return SR_OK; | |
501 | } | |
502 | ||
503 | static int cleanup(struct sr_input *in) | |
504 | { | |
505 | struct sr_datafeed_packet packet; | |
506 | struct context *inc; | |
507 | ||
508 | inc = in->priv; | |
509 | if (inc->started) { | |
510 | /* End of stream. */ | |
511 | packet.type = SR_DF_END; | |
512 | sr_session_send(in->sdi, &packet); | |
513 | } | |
514 | ||
515 | g_slist_free_full(inc->channels, free_channel); | |
516 | g_free(inc); | |
517 | in->priv = NULL; | |
518 | ||
519 | return SR_OK; | |
520 | } | |
521 | ||
522 | static struct sr_option options[] = { | |
523 | { "numchannels", "Number of channels", "Number of channels", NULL, NULL }, | |
524 | { "skip", "Skip", "Skip until timestamp", NULL, NULL }, | |
525 | { "downsample", "Downsample", "Divide samplerate by factor", NULL, NULL }, | |
526 | { "compress", "Compress", "Compress idle periods longer than this value", NULL, NULL }, | |
527 | ALL_ZERO | |
528 | }; | |
529 | ||
530 | static struct sr_option *get_options(void) | |
531 | { | |
532 | if (!options[0].def) { | |
533 | options[0].def = g_variant_ref_sink(g_variant_new_int32(DEFAULT_NUM_CHANNELS)); | |
534 | options[1].def = g_variant_ref_sink(g_variant_new_int32(-1)); | |
535 | options[2].def = g_variant_ref_sink(g_variant_new_int32(1)); | |
536 | options[3].def = g_variant_ref_sink(g_variant_new_int32(0)); | |
537 | } | |
538 | ||
539 | return options; | |
540 | } | |
541 | ||
542 | SR_PRIV struct sr_input_module input_vcd = { | |
543 | .id = "vcd", | |
544 | .name = "VCD", | |
545 | .desc = "Value Change Dump", | |
546 | .metadata = { SR_INPUT_META_HEADER | SR_INPUT_META_REQUIRED }, | |
547 | .options = get_options, | |
548 | .format_match = format_match, | |
549 | .init = init, | |
550 | .receive = receive, | |
551 | .cleanup = cleanup, | |
552 | }; |