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bits.c
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1 /*
2  * This file is part of the sigrok project.
3  *
4  * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
5  * Copyright (C) 2011 HÃ¥vard Espeland <gus@ping.uio.no>
6  *
7  * This program is free software: you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation, either version 3 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program. If not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #include <stdlib.h>
22 #include <string.h>
23 #include <glib.h>
24 #include "sigrok.h"
25 #include "sigrok-internal.h"
26 #include "text.h"
27 
28 SR_PRIV int init_bits(struct sr_output *o)
29 {
30  return init(o, DEFAULT_BPL_BITS, MODE_BITS);
31 }
32 
33 SR_PRIV int data_bits(struct sr_output *o, const uint8_t *data_in,
34  uint64_t length_in, uint8_t **data_out,
35  uint64_t *length_out)
36 {
37  struct context *ctx;
38  unsigned int outsize, offset, p;
39  int max_linelen;
40  uint64_t sample;
41  uint8_t *outbuf, c;
42 
43  ctx = o->internal;
44  max_linelen = SR_MAX_PROBENAME_LEN + 3 + ctx->samples_per_line
45  + ctx->samples_per_line / 8;
46  /*
47  * Calculate space needed for probes. Set aside 512 bytes for
48  * extra output, e.g. trigger.
49  */
50  outsize = 512 + (1 + (length_in / ctx->unitsize) / ctx->samples_per_line)
51  * (ctx->num_enabled_probes * max_linelen);
52 
53  if (!(outbuf = g_try_malloc0(outsize + 1))) {
54  sr_err("bits out: %s: outbuf malloc failed", __func__);
55  return SR_ERR_MALLOC;
56  }
57 
58  outbuf[0] = '\0';
59  if (ctx->header) {
60  /* The header is still here, this must be the first packet. */
61  strncpy((char *)outbuf, ctx->header, outsize);
62  g_free(ctx->header);
63  ctx->header = NULL;
64 
65  /* Ensure first transition. */
66  memcpy(&ctx->prevsample, data_in, ctx->unitsize);
67  ctx->prevsample = ~ctx->prevsample;
68  }
69 
70  if (length_in >= ctx->unitsize) {
71  for (offset = 0; offset <= length_in - ctx->unitsize;
72  offset += ctx->unitsize) {
73  memcpy(&sample, data_in + offset, ctx->unitsize);
74  for (p = 0; p < ctx->num_enabled_probes; p++) {
75  c = (sample & ((uint64_t) 1 << p)) ? '1' : '0';
76  ctx->linebuf[p * ctx->linebuf_len +
77  ctx->line_offset] = c;
78  }
79  ctx->line_offset++;
80  ctx->spl_cnt++;
81 
82  /* Add a space every 8th bit. */
83  if ((ctx->spl_cnt & 7) == 0) {
84  for (p = 0; p < ctx->num_enabled_probes; p++)
85  ctx->linebuf[p * ctx->linebuf_len +
86  ctx->line_offset] = ' ';
87  ctx->line_offset++;
88  }
89 
90  /* End of line. */
91  if (ctx->spl_cnt >= ctx->samples_per_line) {
92  flush_linebufs(ctx, outbuf);
93  ctx->line_offset = ctx->spl_cnt = 0;
94  ctx->mark_trigger = -1;
95  }
96  }
97  } else {
98  sr_info("bits out: short buffer (length_in=%" PRIu64 ")",
99  length_in);
100  }
101 
102  *data_out = outbuf;
103  *length_out = strlen((const char *)outbuf);
104 
105  return SR_OK;
106 }
107 
109  .id = "bits",
110  .description = "Bits",
111  .df_type = SR_DF_LOGIC,
112  .init = init_bits,
113  .data = data_bits,
114  .event = event,
115 };