libsigrok/output/text/bits.c

116 lines
3.2 KiB
C

/*
* This file is part of the sigrok project.
*
* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
* Copyright (C) 2011 Håvard Espeland <gus@ping.uio.no>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "sigrok.h"
#include "sigrok-internal.h"
#include "text.h"
SR_PRIV int init_bits(struct sr_output *o)
{
return init(o, DEFAULT_BPL_BITS, MODE_BITS);
}
SR_PRIV int data_bits(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 outsize, offset, p;
int max_linelen;
uint64_t sample;
uint8_t *outbuf, c;
ctx = o->internal;
max_linelen = SR_MAX_PROBENAME_LEN + 3 + ctx->samples_per_line
+ ctx->samples_per_line / 8;
/*
* Calculate space needed for probes. Set aside 512 bytes for
* extra output, e.g. trigger.
*/
outsize = 512 + (1 + (length_in / ctx->unitsize) / ctx->samples_per_line)
* (ctx->num_enabled_probes * max_linelen);
if (!(outbuf = g_try_malloc0(outsize + 1))) {
sr_err("bits out: %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;
/* Ensure first transition. */
memcpy(&ctx->prevsample, data_in, ctx->unitsize);
ctx->prevsample = ~ctx->prevsample;
}
if (length_in >= ctx->unitsize) {
for (offset = 0; offset <= length_in - ctx->unitsize;
offset += ctx->unitsize) {
memcpy(&sample, data_in + offset, ctx->unitsize);
for (p = 0; p < ctx->num_enabled_probes; p++) {
c = (sample & ((uint64_t) 1 << p)) ? '1' : '0';
ctx->linebuf[p * ctx->linebuf_len +
ctx->line_offset] = c;
}
ctx->line_offset++;
ctx->spl_cnt++;
/* Add a space every 8th bit. */
if ((ctx->spl_cnt & 7) == 0) {
for (p = 0; p < ctx->num_enabled_probes; p++)
ctx->linebuf[p * ctx->linebuf_len +
ctx->line_offset] = ' ';
ctx->line_offset++;
}
/* End of line. */
if (ctx->spl_cnt >= ctx->samples_per_line) {
flush_linebufs(ctx, outbuf);
ctx->line_offset = ctx->spl_cnt = 0;
ctx->mark_trigger = -1;
}
}
} else {
sr_info("bits out: short buffer (length_in=%" PRIu64 ")",
length_in);
}
*data_out = outbuf;
*length_out = strlen((const char *)outbuf);
return SR_OK;
}
SR_PRIV struct sr_output_format output_text_bits = {
.id = "bits",
.description = "Bits",
.df_type = SR_DF_LOGIC,
.init = init_bits,
.data = data_bits,
.event = event,
};