libsigrok/output/vcd.c

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/*
* This file is part of the sigrok project.
*
* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2010-2012 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"
#include "sigrok.h"
#include "sigrok-internal.h"
struct context {
int num_enabled_probes;
int unitsize;
char *probelist[65];
int *prevbits;
GString *header;
uint64_t prevsample;
int period;
uint64_t samplerate;
};
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static const char *vcd_header_comment = "\
$comment\n Acquisition with %d/%d probes at %s\n$end\n";
static int init(struct sr_output *o)
{
struct context *ctx;
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struct sr_probe *probe;
GSList *l;
int num_probes, i;
char *samplerate_s, *frequency_s, *timestamp;
time_t t;
if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
sr_err("vcd out: %s: ctx malloc failed", __func__);
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return SR_ERR_MALLOC;
}
o->internal = ctx;
ctx->num_enabled_probes = 0;
for (l = o->dev->probes; l; l = l->next) {
probe = l->data;
if (!probe->enabled)
continue;
ctx->probelist[ctx->num_enabled_probes++] = probe->name;
}
if (ctx->num_enabled_probes > 94) {
sr_err("vcd out: VCD only supports 94 probes.");
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return SR_ERR;
}
ctx->probelist[ctx->num_enabled_probes] = 0;
ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
ctx->header = g_string_sized_new(512);
num_probes = g_slist_length(o->dev->probes);
/* timestamp */
t = time(NULL);
timestamp = g_strdup(ctime(&t));
timestamp[strlen(timestamp)-1] = 0;
g_string_printf(ctx->header, "$date %s $end\n", timestamp);
g_free(timestamp);
/* generator */
g_string_append_printf(ctx->header, "$version %s %s $end\n",
PACKAGE, PACKAGE_VERSION);
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if (o->dev->driver && sr_dev_has_hwcap(o->dev, SR_HWCAP_SAMPLERATE)) {
ctx->samplerate = *((uint64_t *) o->dev->driver->dev_info_get(
o->dev->driver_index, SR_DI_CUR_SAMPLERATE));
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if (!((samplerate_s = sr_samplerate_string(ctx->samplerate)))) {
g_string_free(ctx->header, TRUE);
g_free(ctx);
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return SR_ERR;
}
g_string_append_printf(ctx->header, vcd_header_comment,
ctx->num_enabled_probes, num_probes, samplerate_s);
g_free(samplerate_s);
}
/* timescale */
/* VCD can only handle 1/10/100 (s - fs), so scale up first */
if (ctx->samplerate > SR_MHZ(1))
ctx->period = SR_GHZ(1);
else if (ctx->samplerate > SR_KHZ(1))
ctx->period = SR_MHZ(1);
else
ctx->period = SR_KHZ(1);
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if (!(frequency_s = sr_period_string(ctx->period))) {
g_string_free(ctx->header, TRUE);
g_free(ctx);
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return SR_ERR;
}
g_string_append_printf(ctx->header, "$timescale %s $end\n", frequency_s);
g_free(frequency_s);
/* scope */
g_string_append_printf(ctx->header, "$scope module %s $end\n", PACKAGE);
/* Wires / channels */
for (i = 0; i < ctx->num_enabled_probes; i++) {
g_string_append_printf(ctx->header, "$var wire 1 %c %s $end\n",
(char)('!' + i), ctx->probelist[i]);
}
g_string_append(ctx->header, "$upscope $end\n"
"$enddefinitions $end\n$dumpvars\n");
if (!(ctx->prevbits = g_try_malloc0(sizeof(int) * num_probes))) {
g_string_free(ctx->header, TRUE);
g_free(ctx);
sr_err("vcd out: %s: ctx->prevbits malloc failed", __func__);
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return SR_ERR_MALLOC;
}
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return SR_OK;
}
static int event(struct sr_output *o, int event_type, char **data_out,
uint64_t *length_out)
{
char *outbuf;
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switch (event_type) {
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case SR_DF_END:
outbuf = g_strdup("$dumpoff\n$end\n");
*data_out = outbuf;
*length_out = strlen(outbuf);
g_free(o->internal);
o->internal = NULL;
break;
default:
*data_out = NULL;
*length_out = 0;
break;
}
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return SR_OK;
}
static int data(struct sr_output *o, const char *data_in, uint64_t length_in,
char **data_out, uint64_t *length_out)
{
struct context *ctx;
unsigned int i;
int p, curbit, prevbit;
uint64_t sample;
static uint64_t samplecount = 0;
GString *out;
int first_sample = 0;
ctx = o->internal;
out = g_string_sized_new(512);
if (ctx->header) {
/* The header is still here, this must be the first packet. */
g_string_append(out, ctx->header->str);
g_string_free(ctx->header, TRUE);
ctx->header = NULL;
first_sample = 1;
}
for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
samplecount++;
memcpy(&sample, data_in + i, ctx->unitsize);
if (first_sample) {
/* First packet. We neg to make sure sample is stored. */
ctx->prevsample = ~sample;
first_sample = 0;
}
for (p = 0; p < ctx->num_enabled_probes; p++) {
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curbit = (sample & ((uint64_t) (1 << p))) >> p;
prevbit = (ctx->prevsample & ((uint64_t) (1 << p))) >> p;
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/* VCD only contains deltas/changes of signals. */
if (prevbit == curbit)
continue;
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/* Output which signal changed to which value. */
g_string_append_printf(out, "#%" PRIu64 "\n%i%c\n",
(uint64_t)(((float)samplecount / ctx->samplerate)
* ctx->period), curbit, (char)('!' + p));
}
ctx->prevsample = sample;
}
*data_out = out->str;
*length_out = out->len;
g_string_free(out, FALSE);
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return SR_OK;
}
struct sr_output_format output_vcd = {
.id = "vcd",
.description = "Value Change Dump (VCD)",
.df_type = SR_DF_LOGIC,
.init = init,
.data = data,
.event = event,
};