+++ /dev/null
-/*
- * 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,
-};
projects / libsigrok.git / blobdiff