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pipistrello-ols: Preliminary port to current API.
[libsigrok.git] / src / hardware / pipistrello-ols / api.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include "protocol.h"
21
22 static const int32_t hwcaps[] = {
23         SR_CONF_LOGIC_ANALYZER,
24         SR_CONF_SAMPLERATE,
25         SR_CONF_TRIGGER_MATCH,
26         SR_CONF_CAPTURE_RATIO,
27         SR_CONF_LIMIT_SAMPLES,
28         SR_CONF_PATTERN_MODE,
29         SR_CONF_EXTERNAL_CLOCK,
30         SR_CONF_SWAP,
31         SR_CONF_RLE,
32 };
33
34 static const int32_t trigger_matches[] = {
35         SR_TRIGGER_ZERO,
36         SR_TRIGGER_ONE,
37         SR_TRIGGER_RISING,
38         SR_TRIGGER_FALLING,
39 };
40
41 #define STR_PATTERN_NONE     "None"
42 #define STR_PATTERN_EXTERNAL "External"
43 #define STR_PATTERN_INTERNAL "Internal"
44
45 /* Supported methods of test pattern outputs */
46 enum {
47         /**
48          * Capture pins 31:16 (unbuffered wing) output a test pattern
49          * that can captured on pins 0:15.
50          */
51         PATTERN_EXTERNAL,
52
53         /** Route test pattern internally to capture buffer. */
54         PATTERN_INTERNAL,
55 };
56
57 static const char *patterns[] = {
58         STR_PATTERN_NONE,
59         STR_PATTERN_EXTERNAL,
60         STR_PATTERN_INTERNAL,
61 };
62
63 /* Channels are numbered 0-31 (on the PCB silkscreen). */
64 SR_PRIV const char *p_ols_channel_names[NUM_CHANNELS + 1] = {
65         "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
66         "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23",
67         "24", "25", "26", "27", "28", "29", "30", "31",
68         NULL,
69 };
70
71 /* Default supported samplerates, can be overridden by device metadata. */
72 static const uint64_t samplerates[] = {
73         SR_HZ(10),
74         SR_MHZ(200),
75         SR_HZ(1),
76 };
77
78 SR_PRIV struct sr_dev_driver p_ols_driver_info;
79 static struct sr_dev_driver *di = &p_ols_driver_info;
80
81 static int init(struct sr_context *sr_ctx)
82 {
83         return std_init(sr_ctx, di, LOG_PREFIX);
84 }
85
86 static GSList *scan(GSList *options)
87 {
88         struct sr_dev_inst *sdi;
89         struct drv_context *drvc;
90         struct dev_context *devc;
91         GSList *devices;
92         int ret, i;
93         char buf[70];
94         int bytes_read;
95
96         (void)options;
97
98         drvc = di->priv;
99
100         devices = NULL;
101
102         /* Allocate memory for our private device context. */
103         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
104                 sr_err("Device context malloc failed.");
105                 goto err_free_nothing;
106         }
107
108         /* Device-specific settings */
109         devc->max_samplebytes = devc->max_samplerate = devc->protocol_version = 0;
110
111         /* Acquisition settings */
112         devc->limit_samples = devc->capture_ratio = 0;
113         devc->trigger_at = -1;
114         devc->channel_mask = 0xffffffff;
115         devc->flag_reg = 0;
116
117         /* Allocate memory for the incoming ftdi data. */
118         if (!(devc->ftdi_buf = g_try_malloc0(FTDI_BUF_SIZE))) {
119                 sr_err("ftdi_buf malloc failed.");
120                 goto err_free_devc;
121         }
122
123         /* Allocate memory for the FTDI context (ftdic) and initialize it. */
124         if (!(devc->ftdic = ftdi_new())) {
125                 sr_err("Failed to initialize libftdi.");
126                 goto err_free_ftdi_buf;;
127         }
128
129         /* Try to open the FTDI device */
130         if (p_ols_open(devc) != SR_OK) {
131                 goto err_free_ftdic;
132         }
133         
134         /* The discovery procedure is like this: first send the Reset
135          * command (0x00) 5 times, since the device could be anywhere
136          * in a 5-byte command. Then send the ID command (0x02).
137          * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
138          * have a match.
139          */
140
141         ret = SR_OK;
142         for (i = 0; i < 5; i++) {
143                 if ((ret = write_shortcommand(devc, CMD_RESET)) != SR_OK) {
144                         break;
145                 }
146         }
147         if (ret != SR_OK) {
148                 sr_err("Could not reset device. Quitting.");
149                 goto err_close_ftdic;
150         }
151         write_shortcommand(devc, CMD_ID);
152
153         /* Read the response data. */
154         bytes_read = ftdi_read_data(devc->ftdic, (uint8_t *)buf, 4);
155         if (bytes_read < 0) {
156                 sr_err("Failed to read FTDI data (%d): %s.",
157                        bytes_read, ftdi_get_error_string(devc->ftdic));
158                 goto err_close_ftdic;
159         }
160         if (bytes_read == 0) {
161                 goto err_close_ftdic;
162         }
163
164         if (strncmp(buf, "1SLO", 4) && strncmp(buf, "1ALS", 4))
165                 goto err_close_ftdic;
166
167         /* Definitely using the OLS protocol, check if it supports
168          * the metadata command.
169          */
170         write_shortcommand(devc, CMD_METADATA);
171
172         /* Read the metadata. */
173         bytes_read = ftdi_read_data(devc->ftdic, (uint8_t *)buf, 64);
174         if (bytes_read < 0) {
175                 sr_err("Failed to read FTDI data (%d): %s.",
176                        bytes_read, ftdi_get_error_string(devc->ftdic));
177                 goto err_close_ftdic;
178         }
179         if (bytes_read == 0) {
180                 goto err_close_ftdic;
181         }
182
183         /* Close device. We'll reopen it again when we need it. */
184         p_ols_close(devc);
185
186         /* Parse the metadata. */
187         sdi = p_ols_get_metadata((uint8_t *)buf, bytes_read, devc);
188         sdi->index = 0;
189
190         /* Configure samplerate and divider. */
191         if (p_ols_set_samplerate(sdi, DEFAULT_SAMPLERATE) != SR_OK)
192                 sr_dbg("Failed to set default samplerate (%"PRIu64").",
193                                 DEFAULT_SAMPLERATE);
194
195         drvc->instances = g_slist_append(drvc->instances, sdi);
196         devices = g_slist_append(devices, sdi);
197
198         return devices;
199
200 err_close_ftdic:
201         p_ols_close(devc);
202 err_free_ftdic:
203         ftdi_free(devc->ftdic); /* NOT free() or g_free()! */
204 err_free_ftdi_buf:
205         g_free(devc->ftdi_buf);
206 err_free_devc:
207         g_free(devc);
208 err_free_nothing:
209
210         return NULL;
211 }
212
213 static GSList *dev_list(void)
214 {
215         return ((struct drv_context *)(di->priv))->instances;
216 }
217
218 static void clear_helper(void *priv)
219 {
220         struct dev_context *devc;
221
222         devc = priv;
223
224         ftdi_free(devc->ftdic);
225         g_free(devc->ftdi_buf);
226 }
227
228 static int dev_clear(void)
229 {
230         return std_dev_clear(di, clear_helper);
231 }
232
233 static int cleanup(void)
234 {
235         return dev_clear();
236 }
237
238
239 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
240                 const struct sr_channel_group *cg)
241 {
242         struct dev_context *devc;
243
244         (void)cg;
245
246         if (!sdi)
247                 return SR_ERR_ARG;
248
249         devc = sdi->priv;
250         switch (id) {
251         case SR_CONF_SAMPLERATE:
252                 *data = g_variant_new_uint64(devc->cur_samplerate);
253                 break;
254         case SR_CONF_CAPTURE_RATIO:
255                 *data = g_variant_new_uint64(devc->capture_ratio);
256                 break;
257         case SR_CONF_LIMIT_SAMPLES:
258                 *data = g_variant_new_uint64(devc->limit_samples);
259                 break;
260         case SR_CONF_PATTERN_MODE:
261                 if (devc->flag_reg & FLAG_EXTERNAL_TEST_MODE)
262                         *data = g_variant_new_string(STR_PATTERN_EXTERNAL);
263                 else if (devc->flag_reg & FLAG_INTERNAL_TEST_MODE)
264                         *data = g_variant_new_string(STR_PATTERN_INTERNAL);
265                 else
266                         *data = g_variant_new_string(STR_PATTERN_NONE);
267                 break;
268         case SR_CONF_RLE:
269                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_RLE ? TRUE : FALSE);
270                 break;
271         case SR_CONF_EXTERNAL_CLOCK:
272                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_CLOCK_EXTERNAL ? TRUE : FALSE);
273                 break;
274         default:
275                 return SR_ERR_NA;
276         }
277
278         return SR_OK;
279 }
280
281 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi,
282                 const struct sr_channel_group *cg)
283 {
284         struct dev_context *devc;
285         uint16_t flag;
286         uint64_t tmp_u64;
287         int ret;
288         const char *stropt;
289
290         (void)cg;
291
292         if (sdi->status != SR_ST_ACTIVE)
293                 return SR_ERR_DEV_CLOSED;
294
295         devc = sdi->priv;
296
297         switch (id) {
298         case SR_CONF_SAMPLERATE:
299                 tmp_u64 = g_variant_get_uint64(data);
300                 if (tmp_u64 < samplerates[0] || tmp_u64 > samplerates[1])
301                         return SR_ERR_SAMPLERATE;
302                 ret = p_ols_set_samplerate(sdi, g_variant_get_uint64(data));
303                 break;
304         case SR_CONF_LIMIT_SAMPLES:
305                 tmp_u64 = g_variant_get_uint64(data);
306                 if (tmp_u64 < MIN_NUM_SAMPLES)
307                         return SR_ERR;
308                 devc->limit_samples = tmp_u64;
309                 ret = SR_OK;
310                 break;
311         case SR_CONF_CAPTURE_RATIO:
312                 devc->capture_ratio = g_variant_get_uint64(data);
313                 if (devc->capture_ratio < 0 || devc->capture_ratio > 100) {
314                         devc->capture_ratio = 0;
315                         ret = SR_ERR;
316                 } else
317                         ret = SR_OK;
318                 break;
319         case SR_CONF_EXTERNAL_CLOCK:
320                 if (g_variant_get_boolean(data)) {
321                         sr_info("Enabling external clock.");
322                         devc->flag_reg |= FLAG_CLOCK_EXTERNAL;
323                 } else {
324                         sr_info("Disabled external clock.");
325                         devc->flag_reg &= ~FLAG_CLOCK_EXTERNAL;
326                 }
327                 ret = SR_OK;
328                 break;
329         case SR_CONF_PATTERN_MODE:
330                 stropt = g_variant_get_string(data, NULL);
331                 ret = SR_OK;
332                 flag = 0xffff;
333                 if (!strcmp(stropt, STR_PATTERN_NONE)) {
334                         sr_info("Disabling test modes.");
335                         flag = 0x0000;
336                 }else if (!strcmp(stropt, STR_PATTERN_INTERNAL)) {
337                         sr_info("Enabling internal test mode.");
338                         flag = FLAG_INTERNAL_TEST_MODE;
339                 } else if (!strcmp(stropt, STR_PATTERN_EXTERNAL)) {
340                         sr_info("Enabling external test mode.");
341                         flag = FLAG_EXTERNAL_TEST_MODE;
342                 } else {
343                         ret = SR_ERR;
344                 }
345                 if (flag != 0xffff) {
346                         devc->flag_reg &= ~(FLAG_INTERNAL_TEST_MODE | FLAG_EXTERNAL_TEST_MODE);
347                         devc->flag_reg |= flag;
348                 }
349                 break;
350         case SR_CONF_SWAP:
351                 if (g_variant_get_boolean(data)) {
352                         sr_info("Enabling channel swapping.");
353                         devc->flag_reg |= FLAG_SWAP_CHANNELS;
354                 } else {
355                         sr_info("Disabling channel swapping.");
356                         devc->flag_reg &= ~FLAG_SWAP_CHANNELS;
357                 }
358                 ret = SR_OK;
359                 break;
360
361         case SR_CONF_RLE:
362                 if (g_variant_get_boolean(data)) {
363                         sr_info("Enabling RLE.");
364                         devc->flag_reg |= FLAG_RLE;
365                 } else {
366                         sr_info("Disabling RLE.");
367                         devc->flag_reg &= ~FLAG_RLE;
368                 }
369                 ret = SR_OK;
370                 break;
371         default:
372                 ret = SR_ERR_NA;
373         }
374
375         return ret;
376 }
377
378 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
379                 const struct sr_channel_group *cg)
380 {
381         struct dev_context *devc;
382         GVariant *gvar, *grange[2];
383         GVariantBuilder gvb;
384         int num_pols_changrp, i;
385
386         (void)cg;
387
388         switch (key) {
389         case SR_CONF_DEVICE_OPTIONS:
390                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
391                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
392                 break;
393         case SR_CONF_SAMPLERATE:
394                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
395                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
396                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
397                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
398                 *data = g_variant_builder_end(&gvb);
399                 break;
400         case SR_CONF_TRIGGER_MATCH:
401                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
402                                 trigger_matches, ARRAY_SIZE(trigger_matches),
403                                 sizeof(int32_t));
404                 break;
405         case SR_CONF_PATTERN_MODE:
406                 *data = g_variant_new_strv(patterns, ARRAY_SIZE(patterns));
407                 break;
408         case SR_CONF_LIMIT_SAMPLES:
409                 if (!sdi)
410                         return SR_ERR_ARG;
411                 devc = sdi->priv;
412                 if (devc->flag_reg & FLAG_RLE)
413                         return SR_ERR_NA;
414                 if (devc->max_samplebytes == 0)
415                         /* Device didn't specify sample memory size in metadata. */
416                         return SR_ERR_NA;
417                 /*
418                  * Channel groups are turned off if no channels in that group are
419                  * enabled, making more room for samples for the enabled group.
420                 */
421                 pols_channel_mask(sdi);
422                 num_pols_changrp = 0;
423                 for (i = 0; i < 4; i++) {
424                         if (devc->channel_mask & (0xff << (i * 8)))
425                                 num_pols_changrp++;
426                 }
427                 /* 3 channel groups takes as many bytes as 4 channel groups */
428                 if (num_pols_changrp == 3)
429                         num_pols_changrp = 4;
430                 grange[0] = g_variant_new_uint64(MIN_NUM_SAMPLES);
431                 if (num_pols_changrp)
432                         grange[1] = g_variant_new_uint64(devc->max_samplebytes / num_pols_changrp);
433                 else
434                         grange[1] = g_variant_new_uint64(MIN_NUM_SAMPLES);
435                 *data = g_variant_new_tuple(grange, 2);
436                 break;
437         default:
438                 return SR_ERR_NA;
439         }
440
441         return SR_OK;
442 }
443
444 static int dev_open(struct sr_dev_inst *sdi)
445 {
446         struct dev_context *devc;
447
448         devc = sdi->priv;
449
450         if (p_ols_open(devc) != SR_OK) {
451                 return SR_ERR;
452         } else {
453           sdi->status = SR_ST_ACTIVE;
454                 return SR_OK;
455         }
456 }
457
458 static int dev_close(struct sr_dev_inst *sdi)
459 {
460         int ret;
461         struct dev_context *devc;
462
463         ret = SR_OK;
464         devc = sdi->priv;
465
466         if (sdi->status == SR_ST_ACTIVE) {
467                 sr_dbg("Status ACTIVE, closing device.");
468                 ret = p_ols_close(devc);
469         } else {
470                 sr_spew("Status not ACTIVE, nothing to do.");
471         }
472
473         sdi->status = SR_ST_INACTIVE;
474
475         return ret;
476 }
477
478
479 static int set_trigger(const struct sr_dev_inst *sdi, int stage)
480 {
481         struct dev_context *devc;
482         uint8_t cmd, arg[4];
483
484         devc = sdi->priv;
485
486         cmd = CMD_SET_TRIGGER_MASK + stage * 4;
487         arg[0] = devc->trigger_mask[stage] & 0xff;
488         arg[1] = (devc->trigger_mask[stage] >> 8) & 0xff;
489         arg[2] = (devc->trigger_mask[stage] >> 16) & 0xff;
490         arg[3] = (devc->trigger_mask[stage] >> 24) & 0xff;
491         if (write_longcommand(devc, cmd, arg) != SR_OK)
492                 return SR_ERR;
493
494         cmd = CMD_SET_TRIGGER_VALUE + stage * 4;
495         arg[0] = devc->trigger_value[stage] & 0xff;
496         arg[1] = (devc->trigger_value[stage] >> 8) & 0xff;
497         arg[2] = (devc->trigger_value[stage] >> 16) & 0xff;
498         arg[3] = (devc->trigger_value[stage] >> 24) & 0xff;
499         if (write_longcommand(devc, cmd, arg) != SR_OK)
500                 return SR_ERR;
501
502         cmd = CMD_SET_TRIGGER_CONFIG + stage * 4;
503         arg[0] = arg[1] = arg[3] = 0x00;
504         arg[2] = stage;
505         if (stage == devc->num_stages)
506                 /* Last stage, fire when this one matches. */
507                 arg[3] |= TRIGGER_START;
508         if (write_longcommand(devc, cmd, arg) != SR_OK)
509                 return SR_ERR;
510
511         cmd = CMD_SET_TRIGGER_EDGE + stage * 4;
512         arg[0] = devc->trigger_edge[stage] & 0xff;
513         arg[1] = (devc->trigger_edge[stage] >> 8) & 0xff;
514         arg[2] = (devc->trigger_edge[stage] >> 16) & 0xff;
515         arg[3] = (devc->trigger_edge[stage] >> 24) & 0xff;
516         if (write_longcommand(devc, cmd, arg) != SR_OK)
517                 return SR_ERR;
518
519         return SR_OK;
520 }
521
522 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
523                 void *cb_data)
524 {
525         struct dev_context *devc;
526         uint32_t samplecount, readcount, delaycount;
527         uint8_t pols_changrp_mask, arg[4];
528         uint16_t flag_tmp;
529         int num_pols_changrp, samplespercount;
530         int ret, i;
531
532         if (sdi->status != SR_ST_ACTIVE)
533                 return SR_ERR_DEV_CLOSED;
534
535         devc = sdi->priv;
536
537         pols_channel_mask(sdi);
538
539         /*
540          * Enable/disable channel groups in the flag register according to the
541          * channel mask. Calculate this here, because num_pols_changrp is
542          * needed to limit readcount.
543          */
544         pols_changrp_mask = 0;
545         num_pols_changrp = 0;
546         for (i = 0; i < 4; i++) {
547                 if (devc->channel_mask & (0xff << (i * 8))) {
548                         pols_changrp_mask |= (1 << i);
549                         num_pols_changrp++;
550                 }
551         }
552         /* 3 channel groups takes as many bytes as 4 channel groups */
553         if (num_pols_changrp == 3)
554                 num_pols_changrp = 4;
555         /* maximum number of samples (or RLE counts) the buffer memory can hold */
556         devc->max_samples = devc->max_samplebytes / num_pols_changrp;
557
558         /*
559          * Limit readcount to prevent reading past the end of the hardware
560          * buffer.
561          */
562         sr_dbg("max_samples = %d", devc->max_samples);
563         sr_dbg("limit_samples = %d", devc->limit_samples);
564         samplecount = MIN(devc->max_samples, devc->limit_samples);
565         sr_dbg("Samplecount = %d", samplecount);
566
567         /* In demux mode the OLS is processing two samples per clock */
568         if (devc->flag_reg & FLAG_DEMUX) {
569                 samplespercount = 8;
570         }
571         else {
572                 samplespercount = 4;
573         }
574
575         readcount = samplecount / samplespercount;
576
577         /* Rather read too many samples than too few. */
578         if (samplecount % samplespercount != 0)
579                 readcount++;
580
581         /* Basic triggers. */
582         if (pols_convert_trigger(sdi) != SR_OK) {
583                 sr_err("Failed to configure channels.");
584                 return SR_ERR;
585         }
586         if (devc->num_stages > 0) {
587                 delaycount = readcount * (1 - devc->capture_ratio / 100.0);
588                 devc->trigger_at = (readcount - delaycount) * samplespercount - devc->num_stages;
589                 for (i = 0; i <= devc->num_stages; i++) {
590                         sr_dbg("Setting p-ols stage %d trigger.", i);
591                         if ((ret = set_trigger(sdi, i)) != SR_OK)
592                                 return ret;
593                 }
594         } else {
595                 /* No triggers configured, force trigger on first stage. */
596                 sr_dbg("Forcing trigger at stage 0.");
597                 if ((ret = set_trigger(sdi, 0)) != SR_OK)
598                         return ret;
599                 delaycount = readcount;
600         }
601
602         /* Samplerate. */
603         sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
604                         devc->cur_samplerate, devc->cur_samplerate_divider);
605         arg[0] = devc->cur_samplerate_divider & 0xff;
606         arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
607         arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
608         arg[3] = 0x00;
609         if (write_longcommand(devc, CMD_SET_DIVIDER, arg) != SR_OK)
610                 return SR_ERR;
611
612         /* Send extended sample limit and pre/post-trigger capture ratio. */
613         arg[0] = ((readcount - 1) & 0xff);
614         arg[1] = ((readcount - 1) & 0xff00) >> 8;
615         arg[2] = ((readcount - 1) & 0xff0000) >> 16;
616         arg[3] = ((readcount - 1) & 0xff000000) >> 24;
617         if (write_longcommand(devc, CMD_CAPTURE_DELAY, arg) != SR_OK)
618                 return SR_ERR;
619         arg[0] = ((delaycount - 1) & 0xff);
620         arg[1] = ((delaycount - 1) & 0xff00) >> 8;
621         arg[2] = ((delaycount - 1) & 0xff0000) >> 16;
622         arg[3] = ((delaycount - 1) & 0xff000000) >> 24;
623         if (write_longcommand(devc, CMD_CAPTURE_COUNT, arg) != SR_OK)
624                 return SR_ERR;
625
626         /* Flag register. */
627         sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s",
628                         devc->flag_reg & FLAG_INTERNAL_TEST_MODE ? "on": "off",
629                         devc->flag_reg & FLAG_EXTERNAL_TEST_MODE ? "on": "off",
630                         devc->flag_reg & FLAG_RLE ? "on" : "off",
631                         devc->flag_reg & FLAG_FILTER ? "on": "off",
632                         devc->flag_reg & FLAG_DEMUX ? "on" : "off");
633
634         /*
635         * Enable/disable OLS channel groups in the flag register according
636         * to the channel mask. 1 means "disable channel".
637         */
638         devc->flag_reg &= ~0x3c;
639         devc->flag_reg |= ~(pols_changrp_mask << 2) & 0x3c;
640         sr_dbg("flag_reg = %x", devc->flag_reg);
641
642         /*
643         * In demux mode the OLS is processing two 8-bit or 16-bit samples 
644         * in parallel and for this to work the lower two bits of the four 
645         * "channel_disable" bits must be replicated to the upper two bits.
646         */
647         flag_tmp = devc->flag_reg;
648         if (devc->flag_reg & FLAG_DEMUX) {
649                 flag_tmp &= ~0x30;
650                 flag_tmp |= ~(pols_changrp_mask << 4) & 0x30;
651         }
652         arg[0] = flag_tmp & 0xff;
653         arg[1] = flag_tmp >> 8;
654         arg[2] = arg[3] = 0x00;
655         if (write_longcommand(devc, CMD_SET_FLAGS, arg) != SR_OK)
656                 return SR_ERR;
657
658         /* Start acquisition on the device. */
659         if (write_shortcommand(devc, CMD_RUN) != SR_OK)
660                 return SR_ERR;
661
662         /* Reset all operational states. */
663         devc->rle_count = devc->num_transfers = 0;
664         devc->num_samples = devc->num_bytes = 0;
665         devc->cnt_bytes = devc->cnt_samples = devc->cnt_samples_rle = 0;
666         memset(devc->sample, 0, 4);
667
668         /* Send header packet to the session bus. */
669         std_session_send_df_header(cb_data, LOG_PREFIX);
670
671         /* Hook up a dummy handler to receive data from the device. */
672         sr_session_source_add(sdi->session, 0, G_IO_IN, 10, p_ols_receive_data,
673                         cb_data);
674
675         return SR_OK;
676 }
677
678
679
680 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
681 {
682         struct dev_context *devc;
683         struct sr_datafeed_packet packet;
684
685         devc = sdi->priv;
686
687         sr_dbg("Stopping acquisition.");
688         write_shortcommand(devc, CMD_RESET);
689         write_shortcommand(devc, CMD_RESET);
690         write_shortcommand(devc, CMD_RESET);
691         write_shortcommand(devc, CMD_RESET);
692         write_shortcommand(devc, CMD_RESET);
693
694         sr_session_source_remove(sdi->session, 0);
695
696         /* Send end packet to the session bus. */
697         sr_dbg("Sending SR_DF_END.");
698         packet.type = SR_DF_END;
699         sr_session_send(cb_data, &packet);
700
701         return SR_OK;
702 }
703
704 SR_PRIV struct sr_dev_driver p_ols_driver_info = {
705         .name = "p-ols",
706         .longname = "Pipistrello OLS",
707         .api_version = 1,
708         .init = init,
709         .cleanup = cleanup,
710         .scan = scan,
711         .dev_list = dev_list,
712         .dev_clear = dev_clear,
713         .config_get = config_get,
714         .config_set = config_set,
715         .config_list = config_list,
716         .dev_open = dev_open,
717         .dev_close = dev_close,
718         .dev_acquisition_start = dev_acquisition_start,
719         .dev_acquisition_stop = dev_acquisition_stop,
720         .priv = NULL,
721 };