libsigrok/output/gnuplot.c

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/*
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* This file is part of the libsigrok project.
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*
* 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"
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/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "output/gnuplot: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
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struct context {
unsigned int num_enabled_probes;
unsigned int unitsize;
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char *header;
uint8_t *old_sample;
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};
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static const char *gnuplot_header = "\
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# Sample data in space-separated columns format usable by gnuplot\n\
#\n\
# Generated by: %s on %s%s\
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# Period: %s\n\
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#\n\
# Column\tProbe\n\
# -------------------------------------\
----------------------------------------\n\
# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";
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static const char *gnuplot_header_comment = "\
# Comment: Acquisition with %d/%d probes at %s\n";
static int init(struct sr_output *o)
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{
struct context *ctx;
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struct sr_probe *probe;
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GSList *l;
GVariant *gvar;
uint64_t samplerate;
unsigned int i;
int num_probes;
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char *c, *frequency_s;
char wbuf[1000], comment[128];
time_t t;
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if (!o) {
sr_err("%s: o was NULL", __func__);
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return SR_ERR_ARG;
}
if (!o->sdi) {
sr_err("%s: o->sdi was NULL", __func__);
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return SR_ERR_ARG;
}
if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
sr_err("%s: ctx malloc failed", __func__);
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return SR_ERR_MALLOC;
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}
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o->internal = ctx;
ctx->num_enabled_probes = 0;
for (l = o->sdi->probes; l; l = l->next) {
probe = l->data;
if (probe->enabled)
ctx->num_enabled_probes++;
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}
ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
num_probes = g_slist_length(o->sdi->probes);
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comment[0] = '\0';
samplerate = 0;
if (sr_config_get(o->sdi->driver, SR_CONF_SAMPLERATE, &gvar,
o->sdi) == SR_OK) {
samplerate = g_variant_get_uint64(gvar);
g_variant_unref(gvar);
if (!(frequency_s = sr_samplerate_string(samplerate))) {
sr_err("%s: sr_samplerate_string failed", __func__);
g_free(ctx);
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return SR_ERR;
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}
snprintf(comment, 127, gnuplot_header_comment,
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ctx->num_enabled_probes, num_probes, frequency_s);
g_free(frequency_s);
}
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/* Columns / channels */
wbuf[0] = '\0';
for (i = 0, l = o->sdi->probes; l; l = l->next, i++) {
probe = l->data;
if (!probe->enabled)
continue;
c = (char *)&wbuf + strlen((const char *)&wbuf);
sprintf(c, "# %d\t\t%s\n", i + 1, probe->name);
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}
if (!(frequency_s = sr_period_string(samplerate))) {
sr_err("%s: sr_period_string failed", __func__);
g_free(ctx);
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return SR_ERR;
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}
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t = time(NULL);
ctx->header = g_strdup_printf(gnuplot_header, PACKAGE_STRING,
ctime(&t), comment, frequency_s, (char *)&wbuf);
g_free(frequency_s);
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if (!(ctx->old_sample = g_try_malloc0(ctx->unitsize))) {
sr_err("%s: ctx->old_sample malloc failed", __func__);
g_free(ctx->header);
g_free(ctx);
return SR_ERR_MALLOC;
}
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return 0;
}
static int event(struct sr_output *o, int event_type, uint8_t **data_out,
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uint64_t *length_out)
{
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if (!o) {
sr_err("%s: o was NULL", __func__);
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return SR_ERR_ARG;
}
if (!data_out) {
sr_err("%s: data_out was NULL", __func__);
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return SR_ERR_ARG;
}
if (!length_out) {
sr_err("%s: length_out was NULL", __func__);
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return SR_ERR_ARG;
}
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switch (event_type) {
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case SR_DF_TRIGGER:
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/* TODO: Can a trigger mark be in a gnuplot data file? */
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break;
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case SR_DF_END:
g_free(o->internal);
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o->internal = NULL;
break;
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default:
sr_err("%s: unsupported event type: %d", __func__, event_type);
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break;
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}
*data_out = NULL;
*length_out = 0;
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return SR_OK;
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}
static int data(struct sr_output *o, const uint8_t *data_in,
uint64_t length_in, uint8_t **data_out, uint64_t *length_out)
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{
struct context *ctx;
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unsigned int max_linelen, outsize, p, curbit, i;
const uint8_t *sample;
static uint64_t samplecount = 0;
uint8_t *outbuf, *c;
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if (!o) {
sr_err("%s: o was NULL", __func__);
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return SR_ERR_ARG;
}
if (!o->internal) {
sr_err("%s: o->internal was NULL", __func__);
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return SR_ERR_ARG;
}
if (!data_in) {
sr_err("%s: data_in was NULL", __func__);
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return SR_ERR_ARG;
}
if (!data_out) {
sr_err("%s: data_out was NULL", __func__);
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return SR_ERR_ARG;
}
if (!length_out) {
sr_err("%s: length_out was NULL", __func__);
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return SR_ERR_ARG;
}
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ctx = o->internal;
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max_linelen = 16 + ctx->num_enabled_probes * 2;
outsize = length_in / ctx->unitsize * max_linelen;
if (ctx->header)
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outsize += strlen(ctx->header);
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if (!(outbuf = g_try_malloc0(outsize))) {
sr_err("%s: outbuf malloc failed", __func__);
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return SR_ERR_MALLOC;
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}
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outbuf[0] = '\0';
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if (ctx->header) {
/* The header is still here, this must be the first packet. */
strncpy((char *)outbuf, ctx->header, outsize);
g_free(ctx->header);
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ctx->header = NULL;
}
for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
sample = data_in + i;
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/*
* Don't output the same samples multiple times. However, make
* sure to output at least the first and last sample.
*/
if (samplecount++ != 0 &&
!memcmp(sample, ctx->old_sample, ctx->unitsize)) {
if (i != (length_in - ctx->unitsize))
continue;
}
memcpy(ctx->old_sample, sample, ctx->unitsize);
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/* The first column is a counter (needed for gnuplot). */
c = outbuf + strlen((const char *)outbuf);
sprintf((char *)c, "%" PRIu64 "\t", samplecount++);
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/* The next columns are the values of all channels. */
for (p = 0; p < ctx->num_enabled_probes; p++) {
curbit = (sample[p / 8] & ((uint8_t) (1 << (p % 8)))) >> (p % 8);
c = outbuf + strlen((const char *)outbuf);
sprintf((char *)c, "%d ", curbit);
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}
c = outbuf + strlen((const char *)outbuf);
sprintf((char *)c, "\n");
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}
*data_out = outbuf;
*length_out = strlen((const char *)outbuf);
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return SR_OK;
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}
SR_PRIV struct sr_output_format output_gnuplot = {
.id = "gnuplot",
.description = "Gnuplot",
.df_type = SR_DF_LOGIC,
.init = init,
.data = data,
.event = event,
};