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hardware: Make USB drivers use the libusb_context in struct sr_context
[libsigrok.git] / hardware / hantek-dso / dso.c
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1/*
2 * This file is part of the sigrok project.
3 *
4 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
5 * With protocol information from the hantekdso project,
6 * Copyright (C) 2008 Oleg Khudyakov <prcoder@gmail.com>
7 *
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include "libsigrok.h"
23#include "libsigrok-internal.h"
24#include "dso.h"
25#include <string.h>
26#include <glib.h>
27#include <libusb.h>
28
29extern struct sr_dev_driver hantek_dso_driver_info;
30
31static int send_begin(struct dev_context *devc)
32{
33 int ret;
34 unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
35 0x00, 0x01, 0x00};
36
37 sr_dbg("Sending CTRL_BEGINCOMMAND.");
38
39 if ((ret = libusb_control_transfer(devc->usb->devhdl,
40 LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
41 0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
42 sr_err("Failed to send begincommand: %d.", ret);
43 return SR_ERR;
44 }
45
46 return SR_OK;
47}
48
49static int send_bulkcmd(struct dev_context *devc, uint8_t *cmdstring, int cmdlen)
50{
51 int ret, tmp;
52
53 if (send_begin(devc) != SR_OK)
54 return SR_ERR;
55
56 if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
57 DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
58 cmdstring, cmdlen, &tmp, 200)) != 0)
59 return SR_ERR;
60
61 return SR_OK;
62}
63
64SR_PRIV int dso_getmps(libusb_device *dev)
65{
66 struct libusb_device_descriptor des;
67 struct libusb_config_descriptor *conf_dsc;
68 const struct libusb_interface_descriptor *intf_dsc;
69 int mps;
70
71 if (libusb_get_device_descriptor(dev, &des) != 0)
72 return 0;
73
74 if (des.bNumConfigurations != 1)
75 return 0;
76
77 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
78 return 0;
79
80 mps = 0;
81 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
82 if (intf_dsc->bNumEndpoints != 2)
83 goto err;
84
85 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
86 (2 | LIBUSB_ENDPOINT_OUT))
87 /* The first endpoint should be 2 (outbound). */
88 goto err;
89
90 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
91 (6 | LIBUSB_ENDPOINT_IN))
92 /* The second endpoint should be 6 (inbound). */
93 goto err;
94
95 mps = intf_dsc->endpoint[1].wMaxPacketSize;
96
97err:
98 if (conf_dsc)
99 libusb_free_config_descriptor(conf_dsc);
100
101 return mps;
102}
103
104SR_PRIV int dso_open(struct sr_dev_inst *sdi)
105{
106 libusb_device **devlist;
107 struct libusb_device_descriptor des;
108 struct dev_context *devc;
109 struct drv_context *drvc = hantek_dso_driver_info.priv;
110 int err, skip, i;
111
112 devc = sdi->priv;
113
114 if (sdi->status == SR_ST_ACTIVE)
115 /* already in use */
116 return SR_ERR;
117
118 skip = 0;
119 libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
120 for (i = 0; devlist[i]; i++) {
121 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
122 sr_err("Failed to get device descriptor: %d.", err);
123 continue;
124 }
125
126 if (des.idVendor != devc->profile->fw_vid
127 || des.idProduct != devc->profile->fw_pid)
128 continue;
129
130 if (sdi->status == SR_ST_INITIALIZING) {
131 if (skip != sdi->index) {
132 /* Skip devices of this type that aren't the one we want. */
133 skip += 1;
134 continue;
135 }
136 } else if (sdi->status == SR_ST_INACTIVE) {
137 /*
138 * This device is fully enumerated, so we need to find
139 * this device by vendor, product, bus and address.
140 */
141 if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
142 || libusb_get_device_address(devlist[i]) != devc->usb->address)
143 /* this is not the one */
144 continue;
145 }
146
147 if (!(err = libusb_open(devlist[i], &devc->usb->devhdl))) {
148 if (devc->usb->address == 0xff)
149 /*
150 * first time we touch this device after firmware upload,
151 * so we don't know the address yet.
152 */
153 devc->usb->address = libusb_get_device_address(devlist[i]);
154
155 if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
156 sr_err("Wrong endpoint profile.");
157 else {
158 sdi->status = SR_ST_ACTIVE;
159 sr_info("Opened device %d on %d.%d interface %d.",
160 sdi->index, devc->usb->bus,
161 devc->usb->address, USB_INTERFACE);
162 }
163 } else {
164 sr_err("Failed to open device: %d.", err);
165 }
166
167 /* If we made it here, we handled the device (somehow). */
168 break;
169 }
170 libusb_free_device_list(devlist, 1);
171
172 if (sdi->status != SR_ST_ACTIVE)
173 return SR_ERR;
174
175 return SR_OK;
176}
177
178SR_PRIV void dso_close(struct sr_dev_inst *sdi)
179{
180 struct dev_context *devc;
181
182 devc = sdi->priv;
183
184 if (devc->usb->devhdl == NULL)
185 return;
186
187 sr_info("Closing device %d on %d.%d interface %d.", sdi->index,
188 devc->usb->bus, devc->usb->address, USB_INTERFACE);
189 libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
190 libusb_close(devc->usb->devhdl);
191 devc->usb->devhdl = NULL;
192 sdi->status = SR_ST_INACTIVE;
193
194}
195
196static int get_channel_offsets(struct dev_context *devc)
197{
198 GString *gs;
199 int chan, v, ret;
200
201 sr_dbg("Getting channel offsets.");
202
203 ret = libusb_control_transfer(devc->usb->devhdl,
204 LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
205 CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
206 (unsigned char *)&devc->channel_levels,
207 sizeof(devc->channel_levels), 200);
208 if (ret != sizeof(devc->channel_levels)) {
209 sr_err("Failed to get channel offsets: %d.", ret);
210 return SR_ERR;
211 }
212
213 /* Comes in as 16-bit numbers with the second byte always 0 on
214 * the DSO-2090. Guessing this is supposed to be big-endian,
215 * since that's how voltage offsets are submitted back to the DSO.
216 * Convert to host order now, so we can use them natively.
217 */
218 for (chan = 0; chan < 2; chan++) {
219 for (v = 0; v < 9; v++) {
220 devc->channel_levels[chan][v][0] =
221 g_ntohs(devc->channel_levels[chan][v][0]);
222 devc->channel_levels[chan][v][1] =
223 g_ntohs(devc->channel_levels[chan][v][1]);
224 }
225 }
226
227 if (sr_log_loglevel_get() >= SR_LOG_DBG) {
228 gs = g_string_sized_new(128);
229 for (chan = 0; chan < 2; chan++) {
230 g_string_printf(gs, "CH%d:", chan + 1);
231 for (v = 0; v < 9; v++) {
232 g_string_append_printf(gs, " %.4x-%.4x",
233 devc->channel_levels[chan][v][0],
234 devc->channel_levels[chan][v][1]);
235 }
236 sr_dbg(gs->str);
237 }
238 g_string_free(gs, TRUE);
239 }
240
241 return SR_OK;
242}
243
244SR_PRIV int dso_set_trigger_samplerate(struct dev_context *devc)
245{
246 int ret, tmp;
247 uint8_t cmdstring[12];
248 uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
249 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
250 uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
251 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
252
253 sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
254
255 memset(cmdstring, 0, sizeof(cmdstring));
256 /* Command */
257 cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
258
259 /* Trigger source */
260 sr_dbg("Trigger source %s.", devc->triggersource);
261 if (!strcmp("CH2", devc->triggersource))
262 tmp = 0;
263 else if (!strcmp("CH1", devc->triggersource))
264 tmp = 1;
265 else if (!strcmp("EXT", devc->triggersource))
266 tmp = 2;
267 else {
268 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
269 return SR_ERR_ARG;
270 }
271 cmdstring[2] = tmp;
272
273 /* Frame size */
274 sr_dbg("Frame size: %d.", devc->framesize);
275 cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
276
277 /* Timebase fast */
278 sr_dbg("Time base index: %d.", devc->timebase);
279 switch (devc->framesize) {
280 case FRAMESIZE_SMALL:
281 if (devc->timebase < TIME_20us)
282 tmp = 0;
283 else if (devc->timebase == TIME_20us)
284 tmp = 1;
285 else if (devc->timebase == TIME_40us)
286 tmp = 2;
287 else if (devc->timebase == TIME_100us)
288 tmp = 3;
289 else if (devc->timebase >= TIME_200us)
290 tmp = 4;
291 break;
292 case FRAMESIZE_LARGE:
293 if (devc->timebase < TIME_40us) {
294 sr_err("Timebase < 40us only supported with 10K buffer.");
295 return SR_ERR_ARG;
296 }
297 else if (devc->timebase == TIME_40us)
298 tmp = 0;
299 else if (devc->timebase == TIME_100us)
300 tmp = 2;
301 else if (devc->timebase == TIME_200us)
302 tmp = 3;
303 else if (devc->timebase >= TIME_400us)
304 tmp = 4;
305 break;
306 }
307 cmdstring[2] |= (tmp & 0x07) << 5;
308
309 /* Enabled channels: 00=CH1 01=CH2 10=both */
310 sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
311 tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
312 cmdstring[3] = tmp;
313
314 /* Fast rates channel */
315 /* TODO: Is this right? */
316 tmp = devc->timebase < TIME_10us ? 1 : 0;
317 cmdstring[3] |= tmp << 2;
318
319 /* Trigger slope: 0=positive 1=negative */
320 /* TODO: Does this work? */
321 sr_dbg("Trigger slope: %d.", devc->triggerslope);
322 cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
323
324 /* Timebase slow */
325 if (devc->timebase < TIME_100us)
326 tmp = 0;
327 else if (devc->timebase > TIME_400ms)
328 tmp = 0xffed;
329 else {
330 if (devc->framesize == FRAMESIZE_SMALL)
331 tmp = timebase_small[devc->timebase - 3];
332 else
333 tmp = timebase_large[devc->timebase - 3];
334 }
335 cmdstring[4] = tmp & 0xff;
336 cmdstring[5] = (tmp >> 8) & 0xff;
337
338 /* Horizontal trigger position */
339 sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
340 tmp = 0x77fff + 0x8000 * devc->triggerposition;
341 cmdstring[6] = tmp & 0xff;
342 cmdstring[7] = (tmp >> 8) & 0xff;
343 cmdstring[10] = (tmp >> 16) & 0xff;
344
345 if (send_begin(devc) != SR_OK)
346 return SR_ERR;
347
348 if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
349 DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
350 cmdstring, sizeof(cmdstring),
351 &tmp, 100)) != 0) {
352 sr_err("Failed to set trigger/samplerate: %d.", ret);
353 return SR_ERR;
354 }
355 sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
356
357 return SR_OK;
358}
359
360SR_PRIV int dso_set_filters(struct dev_context *devc)
361{
362 int ret, tmp;
363 uint8_t cmdstring[8];
364
365 sr_dbg("Preparing CMD_SET_FILTERS.");
366
367 memset(cmdstring, 0, sizeof(cmdstring));
368 cmdstring[0] = CMD_SET_FILTERS;
369 cmdstring[1] = 0x0f;
370 if (devc->filter_ch1) {
371 sr_dbg("Turning on CH1 filter.");
372 cmdstring[2] |= 0x80;
373 }
374 if (devc->filter_ch2) {
375 sr_dbg("Turning on CH2 filter.");
376 cmdstring[2] |= 0x40;
377 }
378 if (devc->filter_trigger) {
379 /* TODO: supported on the DSO-2090? */
380 sr_dbg("Turning on trigger filter.");
381 cmdstring[2] |= 0x20;
382 }
383
384 if (send_begin(devc) != SR_OK)
385 return SR_ERR;
386
387 if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
388 DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
389 cmdstring, sizeof(cmdstring),
390 &tmp, 100)) != 0) {
391 sr_err("Failed to set filters: %d", ret);
392 return SR_ERR;
393 }
394 sr_dbg("Sent CMD_SET_FILTERS.");
395
396 return SR_OK;
397}
398
399SR_PRIV int dso_set_voltage(struct dev_context *devc)
400{
401 int ret, tmp;
402 uint8_t cmdstring[8];
403
404 sr_dbg("Preparing CMD_SET_VOLTAGE.");
405
406 memset(cmdstring, 0, sizeof(cmdstring));
407 cmdstring[0] = CMD_SET_VOLTAGE;
408 cmdstring[1] = 0x0f;
409 cmdstring[2] = 0x30;
410
411 /* CH1 volts/div is encoded in bits 0-1 */
412 sr_dbg("CH1 vdiv index: %d.", devc->voltage_ch1);
413 switch (devc->voltage_ch1) {
414 case VDIV_1V:
415 case VDIV_100MV:
416 case VDIV_10MV:
417 cmdstring[2] |= 0x00;
418 break;
419 case VDIV_2V:
420 case VDIV_200MV:
421 case VDIV_20MV:
422 cmdstring[2] |= 0x01;
423 break;
424 case VDIV_5V:
425 case VDIV_500MV:
426 case VDIV_50MV:
427 cmdstring[2] |= 0x02;
428 break;
429 }
430
431 /* CH2 volts/div is encoded in bits 2-3 */
432 sr_dbg("CH2 vdiv index: %d.", devc->voltage_ch2);
433 switch (devc->voltage_ch2) {
434 case VDIV_1V:
435 case VDIV_100MV:
436 case VDIV_10MV:
437 cmdstring[2] |= 0x00;
438 break;
439 case VDIV_2V:
440 case VDIV_200MV:
441 case VDIV_20MV:
442 cmdstring[2] |= 0x04;
443 break;
444 case VDIV_5V:
445 case VDIV_500MV:
446 case VDIV_50MV:
447 cmdstring[2] |= 0x08;
448 break;
449 }
450
451 if (send_begin(devc) != SR_OK)
452 return SR_ERR;
453
454 if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
455 DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
456 cmdstring, sizeof(cmdstring),
457 &tmp, 100)) != 0) {
458 sr_err("Failed to set voltage: %d.", ret);
459 return SR_ERR;
460 }
461 sr_dbg("Sent CMD_SET_VOLTAGE.");
462
463 return SR_OK;
464}
465
466SR_PRIV int dso_set_relays(struct dev_context *devc)
467{
468 GString *gs;
469 int ret, i;
470 uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
471 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
472
473 sr_dbg("Preparing CTRL_SETRELAYS.");
474
475 if (devc->voltage_ch1 < VDIV_1V)
476 relays[1] = ~relays[1];
477
478 if (devc->voltage_ch1 < VDIV_100MV)
479 relays[2] = ~relays[2];
480
481 sr_dbg("CH1 coupling: %d.", devc->coupling_ch1);
482 if (devc->coupling_ch1 != COUPLING_AC)
483 relays[3] = ~relays[3];
484
485 if (devc->voltage_ch2 < VDIV_1V)
486 relays[4] = ~relays[4];
487
488 if (devc->voltage_ch2 < VDIV_100MV)
489 relays[5] = ~relays[5];
490
491 sr_dbg("CH2 coupling: %d.", devc->coupling_ch1);
492 if (devc->coupling_ch2 != COUPLING_AC)
493 relays[6] = ~relays[6];
494
495 if (!strcmp(devc->triggersource, "EXT"))
496 relays[7] = ~relays[7];
497
498 if (sr_log_loglevel_get() >= SR_LOG_DBG) {
499 gs = g_string_sized_new(128);
500 g_string_printf(gs, "Relays:");
501 for (i = 0; i < 17; i++)
502 g_string_append_printf(gs, " %.2x", relays[i]);
503 sr_dbg(gs->str);
504 g_string_free(gs, TRUE);
505 }
506
507 if ((ret = libusb_control_transfer(devc->usb->devhdl,
508 LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
509 0, 0, relays, 17, 100)) != sizeof(relays)) {
510 sr_err("Failed to set relays: %d.", ret);
511 return SR_ERR;
512 }
513 sr_dbg("Sent CTRL_SETRELAYS.");
514
515 return SR_OK;
516}
517
518SR_PRIV int dso_set_voffsets(struct dev_context *devc)
519{
520 int offset, ret;
521 uint16_t *ch_levels;
522 uint8_t offsets[17];
523
524 sr_dbg("Preparing CTRL_SETOFFSET.");
525
526 memset(offsets, 0, sizeof(offsets));
527 /* Channel 1 */
528 ch_levels = devc->channel_levels[0][devc->voltage_ch1];
529 offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
530 offsets[0] = (offset >> 8) | 0x20;
531 offsets[1] = offset & 0xff;
532 sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
533 offsets[0], offsets[1]);
534
535 /* Channel 2 */
536 ch_levels = devc->channel_levels[1][devc->voltage_ch2];
537 offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
538 offsets[2] = (offset >> 8) | 0x20;
539 offsets[3] = offset & 0xff;
540 sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
541 offsets[2], offsets[3]);
542
543 /* Trigger */
544 offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
545 offsets[4] = (offset >> 8) | 0x20;
546 offsets[5] = offset & 0xff;
547 sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
548 offsets[4], offsets[5]);
549
550 if ((ret = libusb_control_transfer(devc->usb->devhdl,
551 LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
552 0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
553 sr_err("Failed to set offsets: %d.", ret);
554 return SR_ERR;
555 }
556 sr_dbg("Sent CTRL_SETOFFSET.");
557
558 return SR_OK;
559}
560
561SR_PRIV int dso_enable_trigger(struct dev_context *devc)
562{
563 int ret, tmp;
564 uint8_t cmdstring[2];
565
566 sr_dbg("Sending CMD_ENABLE_TRIGGER.");
567
568 memset(cmdstring, 0, sizeof(cmdstring));
569 cmdstring[0] = CMD_ENABLE_TRIGGER;
570 cmdstring[1] = 0x00;
571
572 if (send_begin(devc) != SR_OK)
573 return SR_ERR;
574
575 if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
576 DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
577 cmdstring, sizeof(cmdstring),
578 &tmp, 100)) != 0) {
579 sr_err("Failed to enable trigger: %d.", ret);
580 return SR_ERR;
581 }
582
583 return SR_OK;
584}
585
586SR_PRIV int dso_force_trigger(struct dev_context *devc)
587{
588 int ret, tmp;
589 uint8_t cmdstring[2];
590
591 sr_dbg("Sending CMD_FORCE_TRIGGER.");
592
593 memset(cmdstring, 0, sizeof(cmdstring));
594 cmdstring[0] = CMD_FORCE_TRIGGER;
595 cmdstring[1] = 0x00;
596
597 if (send_begin(devc) != SR_OK)
598 return SR_ERR;
599
600 if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
601 DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
602 cmdstring, sizeof(cmdstring),
603 &tmp, 100)) != 0) {
604 sr_err("Failed to force trigger: %d.", ret);
605 return SR_ERR;
606 }
607
608 return SR_OK;
609}
610
611SR_PRIV int dso_init(struct dev_context *devc)
612{
613
614 sr_dbg("Initializing DSO.");
615
616 if (get_channel_offsets(devc) != SR_OK)
617 return SR_ERR;
618
619 if (dso_set_trigger_samplerate(devc) != SR_OK)
620 return SR_ERR;
621
622 if (dso_set_filters(devc) != SR_OK)
623 return SR_ERR;
624
625 if (dso_set_voltage(devc) != SR_OK)
626 return SR_ERR;
627
628 if (dso_set_relays(devc) != SR_OK)
629 return SR_ERR;
630
631 if (dso_set_voffsets(devc) != SR_OK)
632 return SR_ERR;
633
634 if (dso_enable_trigger(devc) != SR_OK)
635 return SR_ERR;
636
637 return SR_OK;
638}
639
640SR_PRIV int dso_get_capturestate(struct dev_context *devc,
641 uint8_t *capturestate,
642 uint32_t *trigger_offset)
643{
644 int ret, tmp, i;
645 unsigned int bitvalue, toff;
646 uint8_t cmdstring[2], inbuf[512];
647
648 sr_dbg("Sending CMD_GET_CAPTURESTATE.");
649
650 cmdstring[0] = CMD_GET_CAPTURESTATE;
651 cmdstring[1] = 0;
652
653 if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
654 sr_dbg("Failed to send get_capturestate command: %d.", ret);
655 return SR_ERR;
656 }
657
658 if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
659 DSO_EP_IN | LIBUSB_ENDPOINT_IN,
660 inbuf, 512, &tmp, 100)) != 0) {
661 sr_dbg("Failed to get capturestate: %d.", ret);
662 return SR_ERR;
663 }
664 *capturestate = inbuf[0];
665 toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
666
667 /*
668 * This conversion comes from the openhantek project.
669 * Each set bit in the 24-bit value inverts all bits with a lower
670 * value. No idea why the device reports the trigger point this way.
671 */
672 bitvalue = 1;
673 for (i = 0; i < 24; i++) {
674 /* Each set bit inverts all bits with a lower value. */
675 if(toff & bitvalue)
676 toff ^= bitvalue - 1;
677 bitvalue <<= 1;
678 }
679 *trigger_offset = toff;
680
681 return SR_OK;
682}
683
684SR_PRIV int dso_capture_start(struct dev_context *devc)
685{
686 int ret;
687 uint8_t cmdstring[2];
688
689 sr_dbg("Sending CMD_CAPTURE_START.");
690
691 cmdstring[0] = CMD_CAPTURE_START;
692 cmdstring[1] = 0;
693
694 if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
695 sr_err("Failed to send capture_start command: %d.", ret);
696 return SR_ERR;
697 }
698
699 return SR_OK;
700}
701
702SR_PRIV int dso_get_channeldata(struct dev_context *devc, libusb_transfer_cb_fn cb)
703{
704 struct libusb_transfer *transfer;
705 int num_transfers, ret, i;
706 uint8_t cmdstring[2];
707 unsigned char *buf;
708
709 sr_dbg("Sending CMD_GET_CHANNELDATA.");
710
711 cmdstring[0] = CMD_GET_CHANNELDATA;
712 cmdstring[1] = 0;
713
714 if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
715 sr_err("Failed to get channel data: %d.", ret);
716 return SR_ERR;
717 }
718
719 /* TODO: DSO-2xxx only. */
720 num_transfers = devc->framesize *
721 sizeof(unsigned short) / devc->epin_maxpacketsize;
722 sr_dbg("Queueing up %d transfers.", num_transfers);
723 for (i = 0; i < num_transfers; i++) {
724 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
725 sr_err("Failed to malloc USB endpoint buffer.");
726 return SR_ERR_MALLOC;
727 }
728 transfer = libusb_alloc_transfer(0);
729 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
730 DSO_EP_IN | LIBUSB_ENDPOINT_IN, buf,
731 devc->epin_maxpacketsize, cb, devc, 40);
732 if ((ret = libusb_submit_transfer(transfer)) != 0) {
733 sr_err("Failed to submit transfer: %d.", ret);
734 /* TODO: Free them all. */
735 libusb_free_transfer(transfer);
736 g_free(buf);
737 return SR_ERR;
738 }
739 }
740
741 return SR_OK;
742}
Hardware access and backend lib