[libsigrok.git] / output / vcd.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "config.h" /* Needed for PACKAGE and others. */
#include "libsigrok.h"
#include "libsigrok-internal.h"

#define LOG_PREFIX "output/vcd"

struct context {
	int num_enabled_channels;
	GArray *channelindices;
	uint8_t *prevsample;
	gboolean header_done;
	int period;
	int *channel_index;
	uint64_t samplerate;
	uint64_t samplecount;
};

static const char *const vcd_header_comment =
	"$comment\n  Acquisition with %d/%d channels at %s\n$end\n";

static int init(struct sr_output *o)
{
	struct context *ctx;
	struct sr_channel *ch;
	GSList *l;
	int num_enabled_channels, i;

	num_enabled_channels = 0;
	for (l = o->sdi->channels; l; l = l->next) {
		ch = l->data;
		if (ch->type != SR_CHANNEL_LOGIC)
			continue;
		if (!ch->enabled)
			continue;
		num_enabled_channels++;
	}
	if (num_enabled_channels > 94) {
		sr_err("VCD only supports 94 channels.");
		return SR_ERR;
	}

	ctx = g_malloc0(sizeof(struct context));
	o->internal = ctx;
	ctx->num_enabled_channels = num_enabled_channels;
	ctx->channel_index = g_malloc(sizeof(int) * ctx->num_enabled_channels);

	/* Once more to map the enabled channels. */
	for (i = 0, l = o->sdi->channels; l; l = l->next) {
		ch = l->data;
		if (ch->type != SR_CHANNEL_LOGIC)
			continue;
		if (!ch->enabled)
			continue;
		ctx->channel_index[i++] = ch->index;
	}

	return SR_OK;
}

static GString *gen_header(struct sr_output *o)
{
	struct context *ctx;
	struct sr_channel *ch;
	GVariant *gvar;
	GString *header;
	GSList *l;
	time_t t;
	int num_channels, i;
	char *samplerate_s, *frequency_s, *timestamp;

	ctx = o->internal;
	header = g_string_sized_new(512);
	num_channels = g_slist_length(o->sdi->channels);

	/* timestamp */
	t = time(NULL);
	timestamp = g_strdup(ctime(&t));
	timestamp[strlen(timestamp)-1] = 0;
	g_string_printf(header, "$date %s $end\n", timestamp);
	g_free(timestamp);

	/* generator */
	g_string_append_printf(header, "$version %s %s $end\n",
			PACKAGE, PACKAGE_VERSION);
	g_string_append_printf(header, "$comment\n  Acquisition with "
			"%d/%d channels", ctx->num_enabled_channels, num_channels);

	if (ctx->samplerate == 0) {
		if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
				&gvar) == SR_OK) {
			ctx->samplerate = g_variant_get_uint64(gvar);
			g_variant_unref(gvar);
		}
	}
	if (ctx->samplerate != 0) {
		samplerate_s = sr_samplerate_string(ctx->samplerate);
		g_string_append_printf(header, " at %s", samplerate_s);
		g_free(samplerate_s);
	}
	g_string_append_printf(header, "\n$end\n");

	/* timescale */
	/* VCD can only handle 1/10/100 (s - fs), so scale up first */
	if (ctx->samplerate > SR_MHZ(1))
		ctx->period = SR_GHZ(1);
	else if (ctx->samplerate > SR_KHZ(1))
		ctx->period = SR_MHZ(1);
	else
		ctx->period = SR_KHZ(1);
	frequency_s = sr_period_string(ctx->period);
	g_string_append_printf(header, "$timescale %s $end\n", frequency_s);
	g_free(frequency_s);

	/* scope */
	g_string_append_printf(header, "$scope module %s $end\n", PACKAGE);

	/* Wires / channels */
	for (i = 0, l = o->sdi->channels; l; l = l->next, i++) {
		ch = l->data;
		if (ch->type != SR_CHANNEL_LOGIC)
			continue;
		if (!ch->enabled)
			continue;
		g_string_append_printf(header, "$var wire 1 %c %s $end\n",
				(char)('!' + i), ch->name);
	}

	g_string_append(header, "$upscope $end\n$enddefinitions $end\n");

	return header;
}

static int receive(struct sr_output *o, const struct sr_datafeed_packet *packet,
		GString **out)
{
	const struct sr_datafeed_meta *meta;
	const struct sr_datafeed_logic *logic;
	const struct sr_config *src;
	GSList *l;
	struct context *ctx;
	unsigned int i;
	int p, curbit, prevbit, index;
	uint8_t *sample;
	gboolean timestamp_written;

	*out = NULL;
	if (!o || !o->internal)
		return SR_ERR_BUG;
	ctx = o->internal;

	switch (packet->type) {
	case SR_DF_META:
		meta = packet->payload;
		for (l = meta->config; l; l = l->next) {
			src = l->data;
			if (src->key != SR_CONF_SAMPLERATE)
				continue;
			ctx->samplerate = g_variant_get_uint64(src->data);
		}
		break;
	case SR_DF_LOGIC:
		logic = packet->payload;

		if (!ctx->header_done) {
			*out = gen_header(o);
			ctx->header_done = TRUE;
		} else {
			*out = g_string_sized_new(512);
		}

		if (!ctx->prevsample) {
			/* Can't allocate this until we know the stream's unitsize. */
			ctx->prevsample = g_malloc0(logic->unitsize);
		}

		for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) {
			sample = logic->data + i;
			timestamp_written = FALSE;

			for (p = 0; p < ctx->num_enabled_channels; p++) {
				index = ctx->channel_index[p];

				curbit = ((unsigned)sample[index / 8]
						>> (index % 8)) & 1;
				prevbit = ((unsigned)ctx->prevsample[index / 8]
						>> (index % 8)) & 1;

				/* VCD only contains deltas/changes of signals. */
				if (prevbit == curbit && ctx->samplecount > 0)
					continue;

				/* Output timestamp of subsequent signal changes. */
				if (!timestamp_written)
					g_string_append_printf(*out, "#%.0f",
						(double)ctx->samplecount /
							ctx->samplerate * ctx->period);

				/* Output which signal changed to which value. */
				g_string_append_c(*out, ' ');
				g_string_append_c(*out, '0' + curbit);
				g_string_append_c(*out, '!' + p);

				timestamp_written = TRUE;
			}

			if (timestamp_written)
				g_string_append_c(*out, '\n');

			ctx->samplecount++;
			memcpy(ctx->prevsample, sample, logic->unitsize);
		}
		break;
	case SR_DF_END:
		/* Write final timestamp as length indicator. */
		*out = g_string_sized_new(512);
		g_string_printf(*out, "#%.0f\n",
				(double)ctx->samplecount / ctx->samplerate * ctx->period);
		break;
	}

	return SR_OK;
}

static int cleanup(struct sr_output *o)
{
	struct context *ctx;

	if (!o || !o->internal)
		return SR_ERR_ARG;

	ctx = o->internal;
	g_free(ctx->prevsample);
	g_free(ctx->channel_index);
	g_free(ctx);

	return SR_OK;
}

struct sr_output_format output_vcd = {
	.id = "vcd",
	.description = "Value Change Dump (VCD)",
	.init = init,
	.receive = receive,
	.cleanup = cleanup,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2013 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 2 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, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include <stdlib.h>
	23	#include <string.h>
	24	#include <glib.h>
	25	#include "config.h" /* Needed for PACKAGE and others. */
	26	#include "libsigrok.h"
	27	#include "libsigrok-internal.h"
	28
	29	#define LOG_PREFIX "output/vcd"
	30
	31	struct context {
	32	int num_enabled_channels;
	33	GArray *channelindices;
	34	uint8_t *prevsample;
	35	gboolean header_done;
	36	int period;
	37	int *channel_index;
	38	uint64_t samplerate;
	39	uint64_t samplecount;
	40	};
	41
	42	static const char *const vcd_header_comment =
	43	"$comment\n Acquisition with %d/%d channels at %s\n$end\n";
	44
	45	static int init(struct sr_output *o)
	46	{
	47	struct context *ctx;
	48	struct sr_channel *ch;
	49	GSList *l;
	50	int num_enabled_channels, i;
	51
	52	num_enabled_channels = 0;
	53	for (l = o->sdi->channels; l; l = l->next) {
	54	ch = l->data;
	55	if (ch->type != SR_CHANNEL_LOGIC)
	56	continue;
	57	if (!ch->enabled)
	58	continue;
	59	num_enabled_channels++;
	60	}
	61	if (num_enabled_channels > 94) {
	62	sr_err("VCD only supports 94 channels.");
	63	return SR_ERR;
	64	}
	65
	66	ctx = g_malloc0(sizeof(struct context));
	67	o->internal = ctx;
	68	ctx->num_enabled_channels = num_enabled_channels;
	69	ctx->channel_index = g_malloc(sizeof(int) * ctx->num_enabled_channels);
	70
	71	/* Once more to map the enabled channels. */
	72	for (i = 0, l = o->sdi->channels; l; l = l->next) {
	73	ch = l->data;
	74	if (ch->type != SR_CHANNEL_LOGIC)
	75	continue;
	76	if (!ch->enabled)
	77	continue;
	78	ctx->channel_index[i++] = ch->index;
	79	}
	80
	81	return SR_OK;
	82	}
	83
	84	static GString gen_header(struct sr_output o)
	85	{
	86	struct context *ctx;
	87	struct sr_channel *ch;
	88	GVariant *gvar;
	89	GString *header;
	90	GSList *l;
	91	time_t t;
	92	int num_channels, i;
	93	char samplerate_s, frequency_s, *timestamp;
	94
	95	ctx = o->internal;
	96	header = g_string_sized_new(512);
	97	num_channels = g_slist_length(o->sdi->channels);
	98
	99	/* timestamp */
	100	t = time(NULL);
	101	timestamp = g_strdup(ctime(&t));
	102	timestamp[strlen(timestamp)-1] = 0;
	103	g_string_printf(header, "$date %s $end\n", timestamp);
	104	g_free(timestamp);
	105
	106	/* generator */
	107	g_string_append_printf(header, "$version %s %s $end\n",
	108	PACKAGE, PACKAGE_VERSION);
	109	g_string_append_printf(header, "$comment\n Acquisition with "
	110	"%d/%d channels", ctx->num_enabled_channels, num_channels);
	111
	112	if (ctx->samplerate == 0) {
	113	if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
	114	&gvar) == SR_OK) {
	115	ctx->samplerate = g_variant_get_uint64(gvar);
	116	g_variant_unref(gvar);
	117	}
	118	}
	119	if (ctx->samplerate != 0) {
	120	samplerate_s = sr_samplerate_string(ctx->samplerate);
	121	g_string_append_printf(header, " at %s", samplerate_s);
	122	g_free(samplerate_s);
	123	}
	124	g_string_append_printf(header, "\n$end\n");
	125
	126	/* timescale */
	127	/* VCD can only handle 1/10/100 (s - fs), so scale up first */
	128	if (ctx->samplerate > SR_MHZ(1))
	129	ctx->period = SR_GHZ(1);
	130	else if (ctx->samplerate > SR_KHZ(1))
	131	ctx->period = SR_MHZ(1);
	132	else
	133	ctx->period = SR_KHZ(1);
	134	frequency_s = sr_period_string(ctx->period);
	135	g_string_append_printf(header, "$timescale %s $end\n", frequency_s);
	136	g_free(frequency_s);
	137
	138	/* scope */
	139	g_string_append_printf(header, "$scope module %s $end\n", PACKAGE);
	140
	141	/* Wires / channels */
	142	for (i = 0, l = o->sdi->channels; l; l = l->next, i++) {
	143	ch = l->data;
	144	if (ch->type != SR_CHANNEL_LOGIC)
	145	continue;
	146	if (!ch->enabled)
	147	continue;
	148	g_string_append_printf(header, "$var wire 1 %c %s $end\n",
	149	(char)('!' + i), ch->name);
	150	}
	151
	152	g_string_append(header, "$upscope $end\n$enddefinitions $end\n");
	153
	154	return header;
	155	}
	156
	157	static int receive(struct sr_output o, const struct sr_datafeed_packet packet,
	158	GString **out)
	159	{
	160	const struct sr_datafeed_meta *meta;
	161	const struct sr_datafeed_logic *logic;
	162	const struct sr_config *src;
	163	GSList *l;
	164	struct context *ctx;
	165	unsigned int i;
	166	int p, curbit, prevbit, index;
	167	uint8_t *sample;
	168	gboolean timestamp_written;
	169
	170	*out = NULL;
	171	if (!o \|\| !o->internal)
	172	return SR_ERR_BUG;
	173	ctx = o->internal;
	174
	175	switch (packet->type) {
	176	case SR_DF_META:
	177	meta = packet->payload;
	178	for (l = meta->config; l; l = l->next) {
	179	src = l->data;
	180	if (src->key != SR_CONF_SAMPLERATE)
	181	continue;
	182	ctx->samplerate = g_variant_get_uint64(src->data);
	183	}
	184	break;
	185	case SR_DF_LOGIC:
	186	logic = packet->payload;
	187
	188	if (!ctx->header_done) {
	189	*out = gen_header(o);
	190	ctx->header_done = TRUE;
	191	} else {
	192	*out = g_string_sized_new(512);
	193	}
	194
	195	if (!ctx->prevsample) {
	196	/* Can't allocate this until we know the stream's unitsize. */
	197	ctx->prevsample = g_malloc0(logic->unitsize);
	198	}
	199
	200	for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) {
	201	sample = logic->data + i;
	202	timestamp_written = FALSE;
	203
	204	for (p = 0; p < ctx->num_enabled_channels; p++) {
	205	index = ctx->channel_index[p];
	206
	207	curbit = ((unsigned)sample[index / 8]
	208	>> (index % 8)) & 1;
	209	prevbit = ((unsigned)ctx->prevsample[index / 8]
	210	>> (index % 8)) & 1;
	211
	212	/* VCD only contains deltas/changes of signals. */
	213	if (prevbit == curbit && ctx->samplecount > 0)
	214	continue;
	215
	216	/* Output timestamp of subsequent signal changes. */
	217	if (!timestamp_written)
	218	g_string_append_printf(*out, "#%.0f",
	219	(double)ctx->samplecount /
	220	ctx->samplerate * ctx->period);
	221
	222	/* Output which signal changed to which value. */
	223	g_string_append_c(*out, ' ');
	224	g_string_append_c(*out, '0' + curbit);
	225	g_string_append_c(*out, '!' + p);
	226
	227	timestamp_written = TRUE;
	228	}
	229
	230	if (timestamp_written)
	231	g_string_append_c(*out, '\n');
	232
	233	ctx->samplecount++;
	234	memcpy(ctx->prevsample, sample, logic->unitsize);
	235	}
	236	break;
	237	case SR_DF_END:
	238	/* Write final timestamp as length indicator. */
	239	*out = g_string_sized_new(512);
	240	g_string_printf(*out, "#%.0f\n",
	241	(double)ctx->samplecount / ctx->samplerate * ctx->period);
	242	break;
	243	}
	244
	245	return SR_OK;
	246	}
	247
	248	static int cleanup(struct sr_output *o)
	249	{
	250	struct context *ctx;
	251
	252	if (!o \|\| !o->internal)
	253	return SR_ERR_ARG;
	254
	255	ctx = o->internal;
	256	g_free(ctx->prevsample);
	257	g_free(ctx->channel_index);
	258	g_free(ctx);
	259
	260	return SR_OK;
	261	}
	262
	263	struct sr_output_format output_vcd = {
	264	.id = "vcd",
	265	.description = "Value Change Dump (VCD)",
	266	.init = init,
	267	.receive = receive,
	268	.cleanup = cleanup,
	269	};