--- /dev/null
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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_STRING and others. */
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+#define LOG_PREFIX "output/gnuplot"
+
+struct context {
+ unsigned int num_enabled_channels;
+ uint64_t samplerate;
+ uint64_t samplecount;
+ gboolean header_done;
+ uint8_t *prevsample;
+ int *channel_index;
+};
+
+static const char *gnuplot_header = "\
+# Sample data in space-separated columns format usable by gnuplot.\n";
+static const char *gnuplot_header2 = "\
+#\n# Column\tChannel\n\
+# -----------------------------------------------------------------------------\n\
+# 0\t\tSample counter (for internal gnuplot purposes)\n";
+
+
+static int init(struct sr_output *o)
+{
+ struct context *ctx;
+ struct sr_channel *ch;
+ GSList *l;
+ unsigned int i;
+
+ if (!o || !o->sdi)
+ return SR_ERR_ARG;
+
+ ctx = g_malloc0(sizeof(struct context));
+ o->internal = ctx;
+ ctx->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;
+ ctx->num_enabled_channels++;
+ }
+ if (ctx->num_enabled_channels <= 0) {
+ sr_err("No logic channel enabled.");
+ return SR_ERR;
+ }
+ 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;
+ time_t t;
+ unsigned int num_channels, i;
+ char *samplerate_s;
+
+ ctx = o->internal;
+ 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);
+ }
+ }
+
+ t = time(NULL);
+ header = g_string_sized_new(512);
+ g_string_printf(header, "%s", gnuplot_header);
+ g_string_append_printf(header, "# Generated by %s on %s",
+ PACKAGE_STRING, ctime(&t));
+
+ num_channels = g_slist_length(o->sdi->channels);
+ g_string_append_printf(header, "# Acquisition with %d/%d channels",
+ ctx->num_enabled_channels, num_channels);
+ 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");
+
+ g_string_append_printf(header, "%s", gnuplot_header2);
+
+ /* Columns / channels */
+ for (i = 0; i < ctx->num_enabled_channels; i++) {
+ ch = g_slist_nth_data(o->sdi->channels, ctx->channel_index[i]);
+ g_string_append_printf(header, "# %d\t\t%s\n", i + 1, ch->name);
+ }
+
+ 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;
+ const uint8_t *sample;
+ unsigned int curbit, p, idx, i;
+
+ *out = NULL;
+ if (!o || !o->internal)
+ return SR_ERR_BUG;
+ ctx = o->internal;
+
+ if (packet->type == 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);
+ }
+ }
+
+ if (packet->type != SR_DF_LOGIC)
+ return SR_OK;
+ logic = packet->payload;
+
+ if (!ctx->prevsample) {
+ /* Can't allocate this until we know the stream's unitsize. */
+ ctx->prevsample = g_malloc0(logic->unitsize);
+ }
+
+ if (!ctx->header_done) {
+ *out = gen_header(o);
+ ctx->header_done = TRUE;
+ } else {
+ *out = g_string_sized_new(512);
+ }
+
+ for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) {
+ sample = logic->data + i;
+ ctx->samplecount++;
+
+ /*
+ * Don't output the same sample multiple times, but make
+ * sure to output at least the first and last sample.
+ */
+ if (i > 0 && i < logic->length - logic->unitsize) {
+ if (!memcmp(sample, ctx->prevsample, logic->unitsize))
+ continue;
+ }
+ memcpy(ctx->prevsample, sample, logic->unitsize);
+
+ /* The first column is a counter (needed for gnuplot). */
+ g_string_append_printf(*out, "%" PRIu64 "\t", ctx->samplecount);
+
+ /* The next columns are the values of all channels. */
+ for (p = 0; p < ctx->num_enabled_channels; p++) {
+ idx = ctx->channel_index[p];
+ curbit = (sample[idx / 8] & ((uint8_t) (1 << (idx % 8)))) >> (idx % 8);
+ g_string_append_printf(*out, "%d ", curbit);
+ }
+ g_string_append_printf(*out, "\n");
+ }
+
+ return SR_OK;
+}
+
+static int cleanup(struct sr_output *o)
+{
+ struct context *ctx;
+
+ if (!o || !o->internal)
+ return SR_ERR_BUG;
+ ctx = o->internal;
+ g_free(ctx->channel_index);
+ g_free(ctx->prevsample);
+ g_free(ctx);
+
+ return SR_OK;
+}
+
+SR_PRIV struct sr_output_format output_gnuplot = {
+ .id = "gnuplot",
+ .description = "Gnuplot",
+ .init = init,
+ .receive = receive,
+ .cleanup = cleanup,
+};
projects / libsigrok.git / blobdiff