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uni-t-ut181a: silence compiler warning, use of uninitialized variable
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1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2011 HÃ¥vard Espeland <gus@ping.uio.no>
5  * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
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 <config.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <glib.h>
25 #include <libsigrok/libsigrok.h>
26 #include "libsigrok-internal.h"
27
28 #define LOG_PREFIX "output/hex"
29
30 #define DEFAULT_SAMPLES_PER_LINE 74
31
32 /*
33  * The string looks ugly with escape characters, here is the readable
34  * version: Use . and " for low and high bits, use \ and / to draw
35  * falling and rising edges respectively.
36  */
37 #define DEFAULT_ASCII_CHARS ".\"\\/"
38
39 struct context {
40         size_t num_enabled_channels;
41         size_t spl;
42         size_t spl_cnt;
43         int trigger;
44         uint64_t samplerate;
45         int *channel_index;
46         char **aligned_names;
47         size_t max_namelen;
48         char **line_values;
49         uint8_t *prev_sample;
50         gboolean header_done;
51         GString **lines;
52         const char *charset;
53         gboolean edges;
54 };
55
56 static int init(struct sr_output *o, GHashTable *options)
57 {
58         struct context *ctx;
59         struct sr_channel *ch;
60         GSList *l;
61         size_t j, max_namelen, alloc_line_len;
62
63         if (!o || !o->sdi)
64                 return SR_ERR_ARG;
65
66         ctx = g_malloc0(sizeof(struct context));
67         o->priv = ctx;
68         ctx->trigger = -1;
69         ctx->spl = g_variant_get_uint32(g_hash_table_lookup(options, "width"));
70         ctx->charset = g_strdup(g_variant_get_string(
71                 g_hash_table_lookup(options, "charset"), NULL));
72         if (!ctx->charset || strlen(ctx->charset) < 2) {
73                 g_free((gpointer)ctx->charset);
74                 ctx->charset = g_strdup(DEFAULT_ASCII_CHARS);
75         }
76         ctx->edges = (strlen(ctx->charset) >= 4) ? TRUE : FALSE;
77
78         for (l = o->sdi->channels; l; l = l->next) {
79                 ch = l->data;
80                 if (ch->type != SR_CHANNEL_LOGIC)
81                         continue;
82                 if (!ch->enabled)
83                         continue;
84                 ctx->num_enabled_channels++;
85         }
86         ctx->channel_index = g_malloc0(sizeof(ctx->channel_index[0]) * ctx->num_enabled_channels);
87         ctx->aligned_names = g_malloc0(sizeof(ctx->aligned_names[0]) * ctx->num_enabled_channels);
88         ctx->lines = g_malloc0(sizeof(ctx->lines[0]) * ctx->num_enabled_channels);
89         ctx->prev_sample = g_malloc0(g_slist_length(o->sdi->channels));
90
91         /* Get the maximum length across all active logic channels. */
92         max_namelen = 0;
93         for (l = o->sdi->channels; l; l = l->next) {
94                 ch = l->data;
95                 if (ch->type != SR_CHANNEL_LOGIC)
96                         continue;
97                 if (!ch->enabled)
98                         continue;
99                 max_namelen = MAX(max_namelen, strlen(ch->name));
100         }
101         ctx->max_namelen = max_namelen;
102
103         alloc_line_len = ctx->max_namelen + 8 + ctx->spl;
104         j = 0;
105         for (l = o->sdi->channels; l; l = l->next) {
106                 ch = l->data;
107                 if (ch->type != SR_CHANNEL_LOGIC)
108                         continue;
109                 if (!ch->enabled)
110                         continue;
111
112                 ctx->channel_index[j] = ch->index;
113                 ctx->aligned_names[j] = g_strdup_printf("%*s", (int)max_namelen, ch->name);
114
115                 ctx->lines[j] = g_string_sized_new(alloc_line_len);
116                 g_string_printf(ctx->lines[j], "%s:", ctx->aligned_names[j]);
117
118                 j++;
119         }
120
121         return SR_OK;
122 }
123
124 static GString *gen_header(const struct sr_output *o)
125 {
126         struct context *ctx;
127         GVariant *gvar;
128         GString *header;
129         size_t num_channels;
130         char *samplerate_s;
131
132         ctx = o->priv;
133         if (ctx->samplerate == 0) {
134                 if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
135                                 &gvar) == SR_OK) {
136                         ctx->samplerate = g_variant_get_uint64(gvar);
137                         g_variant_unref(gvar);
138                 }
139         }
140
141         header = g_string_sized_new(512);
142         g_string_printf(header, "%s %s\n", PACKAGE_NAME, sr_package_version_string_get());
143         num_channels = g_slist_length(o->sdi->channels);
144         g_string_append_printf(header, "Acquisition with %zu/%zu channels",
145                         ctx->num_enabled_channels, num_channels);
146         if (ctx->samplerate != 0) {
147                 samplerate_s = sr_samplerate_string(ctx->samplerate);
148                 g_string_append_printf(header, " at %s", samplerate_s);
149                 g_free(samplerate_s);
150         }
151         g_string_append_printf(header, "\n");
152
153         return header;
154 }
155
156 static void maybe_add_trigger(struct context *ctx, GString *out)
157 {
158         int offset;
159
160         if (ctx->trigger < 0)
161                 return;
162         offset = ctx->trigger;
163         ctx->trigger = -1;
164
165         /*
166          * Sample data lines have one character per bit and
167          * no separator between bytes. Align trigger marker
168          * to this layout.
169          */
170         g_string_append_printf(out, "%*s:%*s %d\n",
171                 (int)ctx->max_namelen, "T",
172                 offset + 1, "^", offset);
173 }
174
175 static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet,
176                 GString **out)
177 {
178         const struct sr_datafeed_meta *meta;
179         const struct sr_datafeed_logic *logic;
180         const struct sr_config *src;
181         GSList *l;
182         struct context *ctx;
183         size_t idx, i, j;
184         size_t num_samples;
185         const uint8_t *curr_sample;
186         size_t bytepos;
187         uint8_t bitmask, curbit, prevbit;
188         char c;
189         size_t charidx;
190
191         *out = NULL;
192         if (!o || !o->sdi)
193                 return SR_ERR_ARG;
194         if (!(ctx = o->priv))
195                 return SR_ERR_ARG;
196
197         switch (packet->type) {
198         case SR_DF_META:
199                 meta = packet->payload;
200                 for (l = meta->config; l; l = l->next) {
201                         src = l->data;
202                         if (src->key != SR_CONF_SAMPLERATE)
203                                 continue;
204                         ctx->samplerate = g_variant_get_uint64(src->data);
205                 }
206                 break;
207         case SR_DF_TRIGGER:
208                 ctx->trigger = ctx->spl_cnt;
209                 break;
210         case SR_DF_LOGIC:
211                 if (!ctx->header_done) {
212                         *out = gen_header(o);
213                         ctx->header_done = TRUE;
214                 } else {
215                         *out = g_string_sized_new(512);
216                 }
217
218                 logic = packet->payload;
219                 num_samples = logic->length / logic->unitsize;
220                 curr_sample = logic->data;
221                 while (num_samples--) {
222                         ctx->spl_cnt++;
223                         for (j = 0; j < ctx->num_enabled_channels; j++) {
224                                 idx = ctx->channel_index[j];
225                                 bytepos = idx / 8;
226                                 bitmask = 1U << (idx % 8);
227                                 curbit = curr_sample[bytepos] & bitmask;
228                                 prevbit = ctx->prev_sample[bytepos] & bitmask;
229
230                                 charidx = curbit ? 1 : 0;
231                                 if (ctx->edges && ctx->spl_cnt > 1) {
232                                         if (curbit != prevbit)
233                                                 charidx += 2;
234                                 }
235                                 c = ctx->charset[charidx];
236                                 g_string_append_c(ctx->lines[j], c);
237
238                                 if (ctx->spl_cnt == ctx->spl) {
239                                         /* Flush line buffers. */
240                                         g_string_append_len(*out, ctx->lines[j]->str, ctx->lines[j]->len);
241                                         g_string_append_c(*out, '\n');
242                                         if (j + 1 == ctx->num_enabled_channels)
243                                                 maybe_add_trigger(ctx, *out);
244                                         g_string_printf(ctx->lines[j], "%s:", ctx->aligned_names[j]);
245                                 }
246                         }
247                         if (ctx->spl_cnt == ctx->spl)
248                                 /* Line buffers were already flushed. */
249                                 ctx->spl_cnt = 0;
250                         memcpy(ctx->prev_sample, curr_sample, logic->unitsize);
251                         curr_sample += logic->unitsize;
252                 }
253                 break;
254         case SR_DF_END:
255                 if (ctx->spl_cnt) {
256                         /* Line buffers need flushing. */
257                         *out = g_string_sized_new(512);
258                         for (i = 0; i < ctx->num_enabled_channels; i++) {
259                                 g_string_append_len(*out, ctx->lines[i]->str, ctx->lines[i]->len);
260                                 g_string_append_c(*out, '\n');
261                         }
262                         maybe_add_trigger(ctx, *out);
263                 }
264                 break;
265         }
266
267         return SR_OK;
268 }
269
270 static int cleanup(struct sr_output *o)
271 {
272         struct context *ctx;
273         size_t i;
274
275         if (!o)
276                 return SR_ERR_ARG;
277
278         if (!(ctx = o->priv))
279                 return SR_OK;
280
281         g_free(ctx->channel_index);
282         g_free(ctx->prev_sample);
283         for (i = 0; i < ctx->num_enabled_channels; i++) {
284                 g_free(ctx->aligned_names[i]);
285                 g_string_free(ctx->lines[i], TRUE);
286         }
287         g_free(ctx->aligned_names);
288         g_free(ctx->lines);
289         g_free((gpointer)ctx->charset);
290         g_free(ctx);
291         o->priv = NULL;
292
293         return SR_OK;
294 }
295
296 static struct sr_option options[] = {
297         { "width", "Width", "Number of samples per line", NULL, NULL },
298         { "charset", "Charset", "Characters for 0/1 bits (and fall/rise edges)", NULL, NULL },
299         ALL_ZERO
300 };
301
302 static const struct sr_option *get_options(void)
303 {
304         if (!options[0].def) {
305                 options[0].def = g_variant_new_uint32(DEFAULT_SAMPLES_PER_LINE);
306                 g_variant_ref_sink(options[0].def);
307                 options[1].def = g_variant_new_string(DEFAULT_ASCII_CHARS);
308                 g_variant_ref_sink(options[1].def);
309         }
310
311         return options;
312 }
313
314 SR_PRIV struct sr_output_module output_ascii = {
315         .id = "ascii",
316         .name = "ASCII",
317         .desc = "ASCII art logic data",
318         .exts = (const char*[]){"txt", NULL},
319         .flags = 0,
320         .options = get_options,
321         .init = init,
322         .receive = receive,
323         .cleanup = cleanup,
324 };