libsigrok/output/gnuplot.c

280 lines
6.8 KiB
C

/*
* 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;
unsigned int unitsize;
char *header;
uint8_t *old_sample;
};
static const char *gnuplot_header = "\
# Sample data in space-separated columns format usable by gnuplot\n\
#\n\
# Generated by: %s on %s%s\
# Period: %s\n\
#\n\
# Column\tChannel\n\
# -------------------------------------\
----------------------------------------\n\
# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";
static const char *gnuplot_header_comment = "\
# Comment: Acquisition with %d/%d channels at %s\n";
static int init(struct sr_output *o)
{
struct context *ctx;
struct sr_channel *ch;
GSList *l;
GVariant *gvar;
uint64_t samplerate;
unsigned int i;
int num_channels;
char *c, *frequency_s;
char wbuf[1000], comment[128];
time_t t;
if (!o) {
sr_err("%s: o was NULL", __func__);
return SR_ERR_ARG;
}
if (!o->sdi) {
sr_err("%s: o->sdi was NULL", __func__);
return SR_ERR_ARG;
}
if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
sr_err("%s: ctx malloc failed", __func__);
return SR_ERR_MALLOC;
}
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("%s: no logic channel enabled", __func__);
return SR_ERR;
}
ctx->unitsize = (ctx->num_enabled_channels + 7) / 8;
num_channels = g_slist_length(o->sdi->channels);
comment[0] = '\0';
samplerate = 0;
if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
&gvar) == 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);
return SR_ERR;
}
snprintf(comment, 127, gnuplot_header_comment,
ctx->num_enabled_channels, num_channels, frequency_s);
g_free(frequency_s);
}
/* Columns / channels */
wbuf[0] = '\0';
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;
c = (char *)&wbuf + strlen((const char *)&wbuf);
sprintf(c, "# %d\t\t%s\n", i + 1, ch->name);
}
if (!(frequency_s = sr_period_string(samplerate))) {
sr_err("%s: sr_period_string failed", __func__);
g_free(ctx);
return SR_ERR;
}
t = time(NULL);
ctx->header = g_strdup_printf(gnuplot_header, PACKAGE_STRING,
ctime(&t), comment, frequency_s, (char *)&wbuf);
g_free(frequency_s);
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;
}
return 0;
}
static int event(struct sr_output *o, int event_type, uint8_t **data_out,
uint64_t *length_out)
{
if (!o) {
sr_err("%s: o was NULL", __func__);
return SR_ERR_ARG;
}
if (!data_out) {
sr_err("%s: data_out was NULL", __func__);
return SR_ERR_ARG;
}
if (!length_out) {
sr_err("%s: length_out was NULL", __func__);
return SR_ERR_ARG;
}
switch (event_type) {
case SR_DF_TRIGGER:
/* TODO: Can a trigger mark be in a gnuplot data file? */
break;
case SR_DF_END:
g_free(o->internal);
o->internal = NULL;
break;
default:
sr_err("%s: unsupported event type: %d", __func__, event_type);
break;
}
*data_out = NULL;
*length_out = 0;
return SR_OK;
}
static int data(struct sr_output *o, const uint8_t *data_in,
uint64_t length_in, uint8_t **data_out, uint64_t *length_out)
{
struct context *ctx;
unsigned int max_linelen, outsize, p, curbit, i;
const uint8_t *sample;
static uint64_t samplecount = 0;
uint8_t *outbuf, *c;
if (!o) {
sr_err("%s: o was NULL", __func__);
return SR_ERR_ARG;
}
if (!o->internal) {
sr_err("%s: o->internal was NULL", __func__);
return SR_ERR_ARG;
}
if (!data_in) {
sr_err("%s: data_in was NULL", __func__);
return SR_ERR_ARG;
}
if (!data_out) {
sr_err("%s: data_out was NULL", __func__);
return SR_ERR_ARG;
}
if (!length_out) {
sr_err("%s: length_out was NULL", __func__);
return SR_ERR_ARG;
}
ctx = o->internal;
max_linelen = 16 + ctx->num_enabled_channels * 2;
outsize = length_in / ctx->unitsize * max_linelen;
if (ctx->header)
outsize += strlen(ctx->header);
if (!(outbuf = g_try_malloc0(outsize))) {
sr_err("%s: outbuf malloc failed", __func__);
return SR_ERR_MALLOC;
}
outbuf[0] = '\0';
if (ctx->header) {
/* The header is still here, this must be the first packet. */
strncpy((char *)outbuf, ctx->header, outsize);
g_free(ctx->header);
ctx->header = NULL;
}
for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
sample = data_in + i;
/*
* 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);
/* The first column is a counter (needed for gnuplot). */
c = outbuf + strlen((const char *)outbuf);
sprintf((char *)c, "%" PRIu64 "\t", samplecount++);
/* The next columns are the values of all channels. */
for (p = 0; p < ctx->num_enabled_channels; p++) {
curbit = (sample[p / 8] & ((uint8_t) (1 << (p % 8)))) >> (p % 8);
c = outbuf + strlen((const char *)outbuf);
sprintf((char *)c, "%d ", curbit);
}
c = outbuf + strlen((const char *)outbuf);
sprintf((char *)c, "\n");
}
*data_out = outbuf;
*length_out = strlen((const char *)outbuf);
return SR_OK;
}
SR_PRIV struct sr_output_format output_gnuplot = {
.id = "gnuplot",
.description = "Gnuplot",
.df_type = SR_DF_LOGIC,
.init = init,
.data = data,
.event = event,
};