libsigrok/output/output_gnuplot.c

202 lines
5.0 KiB
C

/*
* This file is part of the sigrok 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 <sigrok.h>
#include "config.h"
struct context {
unsigned int num_enabled_probes;
unsigned int unitsize;
char *probelist[MAX_NUM_PROBES+1];
char *header;
};
#define MAX_HEADER_LEN 1024 + (MAX_NUM_PROBES * (MAX_PROBENAME_LEN + 10))
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\tProbe\n\
# -------------------------------------\
----------------------------------------\n\
# 0\t\tSample counter (for internal gnuplot purposes)\n%s\n";
const char *gnuplot_header_comment = "\
# Comment: Acquisition with %d/%d probes at %s\n";
static int init(struct output *o)
{
struct context *ctx;
struct probe *probe;
GSList *l;
uint64_t samplerate;
unsigned int i;
int b, num_probes;
char *c, *frequency_s;
char wbuf[1000], comment[128];
time_t t;
if (!(ctx = calloc(1, sizeof(struct context))))
return SIGROK_ERR_MALLOC;
if (!(ctx->header = calloc(1, MAX_HEADER_LEN + 1))) {
free(ctx);
return SIGROK_ERR_MALLOC;
}
o->internal = ctx;
ctx->num_enabled_probes = 0;
for (l = o->device->probes; l; l = l->next) {
probe = l->data;
if (!probe->enabled)
continue;
ctx->probelist[ctx->num_enabled_probes++] = probe->name;
}
ctx->probelist[ctx->num_enabled_probes] = 0;
ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
num_probes = g_slist_length(o->device->probes);
comment[0] = '\0';
if (o->device->plugin) {
samplerate = *((uint64_t *) o->device->plugin->get_device_info(
o->device->plugin_index, DI_CUR_SAMPLERATE));
if (!(frequency_s = sigrok_samplerate_string(samplerate))) {
free(ctx->header);
free(ctx);
return SIGROK_ERR;
}
snprintf(comment, 127, gnuplot_header_comment,
ctx->num_enabled_probes, num_probes, frequency_s);
free(frequency_s);
}
/* Columns / channels */
wbuf[0] = '\0';
for (i = 0; i < ctx->num_enabled_probes; i++) {
c = (char *)&wbuf + strlen((char *)&wbuf);
sprintf(c, "# %d\t\t%s\n", i + 1, ctx->probelist[i]);
}
if (!(frequency_s = sigrok_period_string(samplerate))) {
free(ctx->header);
free(ctx);
return SIGROK_ERR;
}
t = time(NULL);
b = snprintf(ctx->header, MAX_HEADER_LEN, gnuplot_header,
PACKAGE_STRING, ctime(&t), comment, frequency_s,
(char *)&wbuf);
free(frequency_s);
if (b < 0) {
free(ctx->header);
free(ctx);
return SIGROK_ERR;
}
return 0;
}
static int event(struct output *o, int event_type, char **data_out,
uint64_t *length_out)
{
struct context *ctx;
ctx = o->internal;
switch (event_type) {
case DF_TRIGGER:
/* TODO: can a trigger mark be in a gnuplot data file? */
break;
case DF_END:
free(o->internal);
o->internal = NULL;
break;
}
*data_out = NULL;
*length_out = 0;
return SIGROK_OK;
}
static int data(struct output *o, char *data_in, uint64_t length_in,
char **data_out, uint64_t *length_out)
{
struct context *ctx;
unsigned int max_linelen, outsize, p, curbit, i;
uint64_t sample;
static uint64_t samplecount = 0;
char *outbuf, *c;
ctx = o->internal;
max_linelen = 16 + ctx->num_enabled_probes * 2;
outsize = length_in / ctx->unitsize * max_linelen;
if (ctx->header)
outsize += strlen(ctx->header);
if (!(outbuf = calloc(1, outsize)))
return SIGROK_ERR_MALLOC;
outbuf[0] = '\0';
if (ctx->header) {
/* The header is still here, this must be the first packet. */
strncpy(outbuf, ctx->header, outsize);
free(ctx->header);
ctx->header = NULL;
}
for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
memcpy(&sample, data_in + i, ctx->unitsize);
/* The first column is a counter (needed for gnuplot). */
c = outbuf + strlen(outbuf);
sprintf(c, "%" PRIu64 "\t", samplecount++);
/* The next columns are the values of all channels. */
for (p = 0; p < ctx->num_enabled_probes; p++) {
curbit = (sample & ((uint64_t) (1 << p))) >> p;
c = outbuf + strlen(outbuf);
sprintf(c, "%d ", curbit);
}
c = outbuf + strlen(outbuf);
sprintf(c, "\n");
}
*data_out = outbuf;
*length_out = strlen(outbuf);
return SIGROK_OK;
}
struct output_format output_gnuplot = {
"gnuplot",
"Gnuplot",
DF_LOGIC,
init,
data,
event,
};