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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Daniel Elstner <daniel.kitta@gmail.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 <config.h> | |
21 | #include <string.h> | |
22 | #include "lwla.h" | |
23 | #include "protocol.h" | |
24 | ||
25 | /* Status polling interval during acquisition. | |
26 | */ | |
27 | #define POLL_INTERVAL 100 /* ms */ | |
28 | ||
29 | /* Submit an already filled-in USB transfer. | |
30 | */ | |
31 | static int submit_transfer(struct dev_context *devc, | |
32 | struct libusb_transfer *xfer) | |
33 | { | |
34 | int ret; | |
35 | ||
36 | ret = libusb_submit_transfer(xfer); | |
37 | ||
38 | if (ret != 0) { | |
39 | sr_err("Submit transfer failed: %s.", libusb_error_name(ret)); | |
40 | devc->transfer_error = TRUE; | |
41 | return SR_ERR; | |
42 | } | |
43 | ||
44 | return SR_OK; | |
45 | } | |
46 | ||
47 | /* Set up transfer for the next register in a write sequence. | |
48 | */ | |
49 | static void next_reg_write(struct acquisition_state *acq) | |
50 | { | |
51 | struct regval *regval; | |
52 | ||
53 | regval = &acq->reg_sequence[acq->reg_seq_pos]; | |
54 | ||
55 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_WRITE_REG); | |
56 | acq->xfer_buf_out[1] = LWLA_WORD(regval->reg); | |
57 | acq->xfer_buf_out[2] = LWLA_WORD_0(regval->val); | |
58 | acq->xfer_buf_out[3] = LWLA_WORD_1(regval->val); | |
59 | ||
60 | acq->xfer_out->length = 4 * sizeof(acq->xfer_buf_out[0]); | |
61 | } | |
62 | ||
63 | /* Set up transfer for the next register in a read sequence. | |
64 | */ | |
65 | static void next_reg_read(struct acquisition_state *acq) | |
66 | { | |
67 | unsigned int addr; | |
68 | ||
69 | addr = acq->reg_sequence[acq->reg_seq_pos].reg; | |
70 | ||
71 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_REG); | |
72 | acq->xfer_buf_out[1] = LWLA_WORD(addr); | |
73 | ||
74 | acq->xfer_out->length = 2 * sizeof(acq->xfer_buf_out[0]); | |
75 | } | |
76 | ||
77 | /* Decode the response to a register read request. | |
78 | */ | |
79 | static int read_reg_response(struct acquisition_state *acq) | |
80 | { | |
81 | uint32_t value; | |
82 | ||
83 | if (acq->xfer_in->actual_length != 4) { | |
84 | sr_err("Received size %d doesn't match expected size 4.", | |
85 | acq->xfer_in->actual_length); | |
86 | return SR_ERR; | |
87 | } | |
88 | value = LWLA_TO_UINT32(acq->xfer_buf_in[0]); | |
89 | acq->reg_sequence[acq->reg_seq_pos].val = value; | |
90 | ||
91 | return SR_OK; | |
92 | } | |
93 | ||
94 | /* Enter a new state and submit the corresponding request to the device. | |
95 | */ | |
96 | static int submit_request(const struct sr_dev_inst *sdi, | |
97 | enum protocol_state state) | |
98 | { | |
99 | struct dev_context *devc; | |
100 | struct acquisition_state *acq; | |
101 | int ret; | |
102 | ||
103 | devc = sdi->priv; | |
104 | acq = devc->acquisition; | |
105 | ||
106 | devc->state = state; | |
107 | ||
108 | acq->xfer_out->length = 0; | |
109 | acq->reg_seq_pos = 0; | |
110 | acq->reg_seq_len = 0; | |
111 | ||
112 | /* Perform the model-specific action for the new state. */ | |
113 | ret = (*devc->model->prepare_request)(sdi); | |
114 | ||
115 | if (ret != SR_OK) { | |
116 | devc->transfer_error = TRUE; | |
117 | return ret; | |
118 | } | |
119 | ||
120 | if (acq->reg_seq_pos < acq->reg_seq_len) { | |
121 | if ((state & STATE_EXPECT_RESPONSE) != 0) | |
122 | next_reg_read(acq); | |
123 | else | |
124 | next_reg_write(acq); | |
125 | } | |
126 | ||
127 | return submit_transfer(devc, acq->xfer_out); | |
128 | } | |
129 | ||
130 | /* Evaluate and act on the response to a capture status request. | |
131 | */ | |
132 | static void handle_status_response(const struct sr_dev_inst *sdi) | |
133 | { | |
134 | struct dev_context *devc; | |
135 | struct acquisition_state *acq; | |
136 | unsigned int old_status; | |
137 | ||
138 | devc = sdi->priv; | |
139 | acq = devc->acquisition; | |
140 | old_status = acq->status; | |
141 | ||
142 | if ((*devc->model->handle_response)(sdi) != SR_OK) { | |
143 | devc->transfer_error = TRUE; | |
144 | return; | |
145 | } | |
146 | devc->state = STATE_STATUS_WAIT; | |
147 | ||
148 | sr_spew("Captured %zu words, %" PRIu64 " ms, status 0x%02X.", | |
149 | acq->mem_addr_fill, acq->duration_now, acq->status); | |
150 | ||
151 | if ((~old_status & acq->status & STATUS_TRIGGERED) != 0) | |
152 | sr_info("Capture triggered."); | |
153 | ||
154 | if (acq->duration_now >= acq->duration_max) { | |
155 | sr_dbg("Time limit reached, stopping capture."); | |
156 | submit_request(sdi, STATE_STOP_CAPTURE); | |
157 | } else if ((acq->status & STATUS_TRIGGERED) == 0) { | |
158 | sr_spew("Waiting for trigger."); | |
159 | } else if ((acq->status & STATUS_MEM_AVAIL) == 0) { | |
160 | sr_dbg("Capture memory filled."); | |
161 | submit_request(sdi, STATE_LENGTH_REQUEST); | |
162 | } else if ((acq->status & STATUS_CAPTURING) != 0) { | |
163 | sr_spew("Sampling in progress."); | |
164 | } | |
165 | } | |
166 | ||
167 | /* Evaluate and act on the response to a capture length request. | |
168 | */ | |
169 | static void handle_length_response(const struct sr_dev_inst *sdi) | |
170 | { | |
171 | struct dev_context *devc; | |
172 | struct acquisition_state *acq; | |
173 | ||
174 | devc = sdi->priv; | |
175 | acq = devc->acquisition; | |
176 | ||
177 | if ((*devc->model->handle_response)(sdi) != SR_OK) { | |
178 | devc->transfer_error = TRUE; | |
179 | return; | |
180 | } | |
181 | acq->rle = RLE_STATE_DATA; | |
182 | acq->sample = 0; | |
183 | acq->run_len = 0; | |
184 | acq->samples_done = 0; | |
185 | acq->mem_addr_done = acq->mem_addr_next; | |
186 | acq->out_index = 0; | |
187 | ||
188 | if (acq->mem_addr_next >= acq->mem_addr_stop) { | |
189 | submit_request(sdi, STATE_READ_FINISH); | |
190 | return; | |
191 | } | |
192 | sr_dbg("%zu words in capture buffer.", | |
193 | acq->mem_addr_stop - acq->mem_addr_next); | |
194 | ||
195 | submit_request(sdi, STATE_READ_PREPARE); | |
196 | } | |
197 | ||
198 | /* Evaluate and act on the response to a capture memory read request. | |
199 | */ | |
200 | static void handle_read_response(const struct sr_dev_inst *sdi) | |
201 | { | |
202 | struct dev_context *devc; | |
203 | struct acquisition_state *acq; | |
204 | struct sr_datafeed_packet packet; | |
205 | struct sr_datafeed_logic logic; | |
206 | size_t end_addr; | |
207 | ||
208 | devc = sdi->priv; | |
209 | acq = devc->acquisition; | |
210 | ||
211 | /* Prepare session packet. */ | |
212 | packet.type = SR_DF_LOGIC; | |
213 | packet.payload = &logic; | |
214 | logic.unitsize = (devc->model->num_channels + 7) / 8; | |
215 | logic.data = acq->out_packet; | |
216 | ||
217 | end_addr = MIN(acq->mem_addr_next, acq->mem_addr_stop); | |
218 | acq->in_index = 0; | |
219 | /* | |
220 | * Repeatedly call the model-specific read response handler until | |
221 | * all data received in the transfer has been accounted for. | |
222 | */ | |
223 | while (!devc->cancel_requested | |
224 | && (acq->run_len > 0 || acq->mem_addr_done < end_addr) | |
225 | && acq->samples_done < acq->samples_max) { | |
226 | ||
227 | if ((*devc->model->handle_response)(sdi) != SR_OK) { | |
228 | devc->transfer_error = TRUE; | |
229 | return; | |
230 | } | |
231 | if (acq->out_index * logic.unitsize >= PACKET_SIZE) { | |
232 | /* Send off full logic packet. */ | |
233 | logic.length = acq->out_index * logic.unitsize; | |
234 | sr_session_send(sdi, &packet); | |
235 | acq->out_index = 0; | |
236 | } | |
237 | } | |
238 | ||
239 | if (!devc->cancel_requested | |
240 | && acq->samples_done < acq->samples_max | |
241 | && acq->mem_addr_next < acq->mem_addr_stop) { | |
242 | /* Request the next block. */ | |
243 | submit_request(sdi, STATE_READ_REQUEST); | |
244 | return; | |
245 | } | |
246 | ||
247 | /* Send partially filled packet as it is the last one. */ | |
248 | if (!devc->cancel_requested && acq->out_index > 0) { | |
249 | logic.length = acq->out_index * logic.unitsize; | |
250 | sr_session_send(sdi, &packet); | |
251 | acq->out_index = 0; | |
252 | } | |
253 | submit_request(sdi, STATE_READ_FINISH); | |
254 | } | |
255 | ||
256 | /* Destroy and unset the acquisition state record. | |
257 | */ | |
258 | static void clear_acquisition_state(const struct sr_dev_inst *sdi) | |
259 | { | |
260 | struct dev_context *devc; | |
261 | struct acquisition_state *acq; | |
262 | ||
263 | devc = sdi->priv; | |
264 | acq = devc->acquisition; | |
265 | ||
266 | devc->acquisition = NULL; | |
267 | ||
268 | if (acq) { | |
269 | libusb_free_transfer(acq->xfer_out); | |
270 | libusb_free_transfer(acq->xfer_in); | |
271 | g_free(acq); | |
272 | } | |
273 | } | |
274 | ||
275 | /* USB I/O source callback. | |
276 | */ | |
277 | static int transfer_event(int fd, int revents, void *cb_data) | |
278 | { | |
279 | const struct sr_dev_inst *sdi; | |
280 | struct dev_context *devc; | |
281 | struct drv_context *drvc; | |
282 | struct timeval tv; | |
283 | struct sr_datafeed_packet packet; | |
284 | int ret; | |
285 | ||
286 | (void)fd; | |
287 | ||
288 | sdi = cb_data; | |
289 | devc = sdi->priv; | |
290 | drvc = sdi->driver->context; | |
291 | ||
292 | if (!devc || !drvc) | |
293 | return G_SOURCE_REMOVE; | |
294 | ||
295 | /* Handle pending USB events without blocking. */ | |
296 | tv.tv_sec = 0; | |
297 | tv.tv_usec = 0; | |
298 | ret = libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, | |
299 | &tv, NULL); | |
300 | if (ret != 0) { | |
301 | sr_err("Event handling failed: %s.", libusb_error_name(ret)); | |
302 | devc->transfer_error = TRUE; | |
303 | } | |
304 | ||
305 | if (!devc->transfer_error && devc->state == STATE_STATUS_WAIT) { | |
306 | if (devc->cancel_requested) | |
307 | submit_request(sdi, STATE_STOP_CAPTURE); | |
308 | else if (revents == 0) /* status poll timeout */ | |
309 | submit_request(sdi, STATE_STATUS_REQUEST); | |
310 | } | |
311 | ||
312 | /* Stop processing events if an error occurred on a transfer. */ | |
313 | if (devc->transfer_error) | |
314 | devc->state = STATE_IDLE; | |
315 | ||
316 | if (devc->state != STATE_IDLE) | |
317 | return G_SOURCE_CONTINUE; | |
318 | ||
319 | sr_info("Acquisition stopped."); | |
320 | ||
321 | /* We are done, clean up and send end packet to session bus. */ | |
322 | clear_acquisition_state(sdi); | |
323 | ||
324 | packet.type = SR_DF_END; | |
325 | packet.payload = NULL; | |
326 | sr_session_send(sdi, &packet); | |
327 | ||
328 | return G_SOURCE_REMOVE; | |
329 | } | |
330 | ||
331 | /* USB output transfer completion callback. | |
332 | */ | |
333 | static void LIBUSB_CALL transfer_out_completed(struct libusb_transfer *transfer) | |
334 | { | |
335 | const struct sr_dev_inst *sdi; | |
336 | struct dev_context *devc; | |
337 | struct acquisition_state *acq; | |
338 | ||
339 | sdi = transfer->user_data; | |
340 | devc = sdi->priv; | |
341 | acq = devc->acquisition; | |
342 | ||
343 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) { | |
344 | sr_err("Transfer to device failed: %d.", transfer->status); | |
345 | devc->transfer_error = TRUE; | |
346 | return; | |
347 | } | |
348 | ||
349 | /* If this was a read request, wait for the response. */ | |
350 | if ((devc->state & STATE_EXPECT_RESPONSE) != 0) { | |
351 | submit_transfer(devc, acq->xfer_in); | |
352 | return; | |
353 | } | |
354 | if (acq->reg_seq_pos < acq->reg_seq_len) | |
355 | acq->reg_seq_pos++; /* register write completed */ | |
356 | ||
357 | /* Repeat until all queued registers have been written. */ | |
358 | if (acq->reg_seq_pos < acq->reg_seq_len && !devc->cancel_requested) { | |
359 | next_reg_write(acq); | |
360 | submit_transfer(devc, acq->xfer_out); | |
361 | return; | |
362 | } | |
363 | ||
364 | switch (devc->state) { | |
365 | case STATE_START_CAPTURE: | |
366 | sr_info("Acquisition started."); | |
367 | ||
368 | if (!devc->cancel_requested) | |
369 | devc->state = STATE_STATUS_WAIT; | |
370 | else | |
371 | submit_request(sdi, STATE_STOP_CAPTURE); | |
372 | break; | |
373 | case STATE_STOP_CAPTURE: | |
374 | if (!devc->cancel_requested) | |
375 | submit_request(sdi, STATE_LENGTH_REQUEST); | |
376 | else | |
377 | devc->state = STATE_IDLE; | |
378 | break; | |
379 | case STATE_READ_PREPARE: | |
380 | if (acq->mem_addr_next < acq->mem_addr_stop && !devc->cancel_requested) | |
381 | submit_request(sdi, STATE_READ_REQUEST); | |
382 | else | |
383 | submit_request(sdi, STATE_READ_FINISH); | |
384 | break; | |
385 | case STATE_READ_FINISH: | |
386 | devc->state = STATE_IDLE; | |
387 | break; | |
388 | default: | |
389 | sr_err("Unexpected device state %d.", devc->state); | |
390 | devc->transfer_error = TRUE; | |
391 | break; | |
392 | } | |
393 | } | |
394 | ||
395 | /* USB input transfer completion callback. | |
396 | */ | |
397 | static void LIBUSB_CALL transfer_in_completed(struct libusb_transfer *transfer) | |
398 | { | |
399 | const struct sr_dev_inst *sdi; | |
400 | struct dev_context *devc; | |
401 | struct acquisition_state *acq; | |
402 | ||
403 | sdi = transfer->user_data; | |
404 | devc = sdi->priv; | |
405 | acq = devc->acquisition; | |
406 | ||
407 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) { | |
408 | sr_err("Transfer from device failed (state %d): %s.", | |
409 | devc->state, libusb_error_name(transfer->status)); | |
410 | devc->transfer_error = TRUE; | |
411 | return; | |
412 | } | |
413 | if ((devc->state & STATE_EXPECT_RESPONSE) == 0) { | |
414 | sr_err("Unexpected completion of input transfer (state %d).", | |
415 | devc->state); | |
416 | devc->transfer_error = TRUE; | |
417 | return; | |
418 | } | |
419 | ||
420 | if (acq->reg_seq_pos < acq->reg_seq_len && !devc->cancel_requested) { | |
421 | /* Complete register read sequence. */ | |
422 | if (read_reg_response(acq) != SR_OK) { | |
423 | devc->transfer_error = TRUE; | |
424 | return; | |
425 | } | |
426 | /* Repeat until all queued registers have been read. */ | |
427 | if (++acq->reg_seq_pos < acq->reg_seq_len) { | |
428 | next_reg_read(acq); | |
429 | submit_transfer(devc, acq->xfer_out); | |
430 | return; | |
431 | } | |
432 | } | |
433 | ||
434 | switch (devc->state) { | |
435 | case STATE_STATUS_REQUEST: | |
436 | if (devc->cancel_requested) | |
437 | submit_request(sdi, STATE_STOP_CAPTURE); | |
438 | else | |
439 | handle_status_response(sdi); | |
440 | break; | |
441 | case STATE_LENGTH_REQUEST: | |
442 | if (devc->cancel_requested) | |
443 | submit_request(sdi, STATE_READ_FINISH); | |
444 | else | |
445 | handle_length_response(sdi); | |
446 | break; | |
447 | case STATE_READ_REQUEST: | |
448 | handle_read_response(sdi); | |
449 | break; | |
450 | default: | |
451 | sr_err("Unexpected device state %d.", devc->state); | |
452 | devc->transfer_error = TRUE; | |
453 | break; | |
454 | } | |
455 | } | |
456 | ||
457 | /* Set up the acquisition state record. | |
458 | */ | |
459 | static int init_acquisition_state(const struct sr_dev_inst *sdi) | |
460 | { | |
461 | struct dev_context *devc; | |
462 | struct sr_usb_dev_inst *usb; | |
463 | struct acquisition_state *acq; | |
464 | ||
465 | devc = sdi->priv; | |
466 | usb = sdi->conn; | |
467 | ||
468 | if (devc->acquisition) { | |
469 | sr_err("Acquisition still in progress?"); | |
470 | return SR_ERR; | |
471 | } | |
472 | if (devc->cfg_clock_source == CLOCK_INTERNAL && devc->samplerate == 0) { | |
473 | sr_err("Samplerate not set."); | |
474 | return SR_ERR; | |
475 | } | |
476 | ||
477 | acq = g_try_malloc0(sizeof(struct acquisition_state)); | |
478 | if (!acq) | |
479 | return SR_ERR_MALLOC; | |
480 | ||
481 | acq->xfer_in = libusb_alloc_transfer(0); | |
482 | if (!acq->xfer_in) { | |
483 | g_free(acq); | |
484 | return SR_ERR_MALLOC; | |
485 | } | |
486 | acq->xfer_out = libusb_alloc_transfer(0); | |
487 | if (!acq->xfer_out) { | |
488 | libusb_free_transfer(acq->xfer_in); | |
489 | g_free(acq); | |
490 | return SR_ERR_MALLOC; | |
491 | } | |
492 | ||
493 | libusb_fill_bulk_transfer(acq->xfer_out, usb->devhdl, EP_COMMAND, | |
494 | (unsigned char *)acq->xfer_buf_out, 0, | |
495 | &transfer_out_completed, | |
496 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); | |
497 | ||
498 | libusb_fill_bulk_transfer(acq->xfer_in, usb->devhdl, EP_REPLY, | |
499 | (unsigned char *)acq->xfer_buf_in, | |
500 | sizeof(acq->xfer_buf_in), | |
501 | &transfer_in_completed, | |
502 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); | |
503 | ||
504 | if (devc->limit_msec > 0) { | |
505 | acq->duration_max = devc->limit_msec; | |
506 | sr_info("Acquisition time limit %" PRIu64 " ms.", | |
507 | devc->limit_msec); | |
508 | } else | |
509 | acq->duration_max = MAX_LIMIT_MSEC; | |
510 | ||
511 | if (devc->limit_samples > 0) { | |
512 | acq->samples_max = devc->limit_samples; | |
513 | sr_info("Acquisition sample count limit %" PRIu64 ".", | |
514 | devc->limit_samples); | |
515 | } else | |
516 | acq->samples_max = MAX_LIMIT_SAMPLES; | |
517 | ||
518 | if (devc->cfg_clock_source == CLOCK_INTERNAL) { | |
519 | sr_info("Internal clock, samplerate %" PRIu64 ".", | |
520 | devc->samplerate); | |
521 | /* Ramp up clock speed to enable samplerates above 100 MS/s. */ | |
522 | acq->clock_boost = (devc->samplerate > SR_MHZ(100)); | |
523 | ||
524 | /* If only one of the limits is set, derive the other one. */ | |
525 | if (devc->limit_msec == 0 && devc->limit_samples > 0) | |
526 | acq->duration_max = devc->limit_samples | |
527 | * 1000 / devc->samplerate + 1; | |
528 | else if (devc->limit_samples == 0 && devc->limit_msec > 0) | |
529 | acq->samples_max = devc->limit_msec | |
530 | * devc->samplerate / 1000; | |
531 | } else { | |
532 | acq->clock_boost = TRUE; | |
533 | ||
534 | if (devc->cfg_clock_edge == EDGE_POSITIVE) | |
535 | sr_info("External clock, rising edge."); | |
536 | else | |
537 | sr_info("External clock, falling edge."); | |
538 | } | |
539 | ||
540 | acq->rle_enabled = devc->cfg_rle; | |
541 | devc->acquisition = acq; | |
542 | ||
543 | return SR_OK; | |
544 | } | |
545 | ||
546 | SR_PRIV int lwla_start_acquisition(const struct sr_dev_inst *sdi) | |
547 | { | |
548 | struct drv_context *drvc; | |
549 | struct dev_context *devc; | |
550 | int ret; | |
551 | ||
552 | drvc = sdi->driver->context; | |
553 | devc = sdi->priv; | |
554 | ||
555 | if (devc->state != STATE_IDLE) { | |
556 | sr_err("Not in idle state, cannot start acquisition."); | |
557 | return SR_ERR; | |
558 | } | |
559 | devc->cancel_requested = FALSE; | |
560 | devc->transfer_error = FALSE; | |
561 | ||
562 | ret = init_acquisition_state(sdi); | |
563 | if (ret != SR_OK) | |
564 | return ret; | |
565 | ||
566 | ret = (*devc->model->setup_acquisition)(sdi); | |
567 | if (ret != SR_OK) { | |
568 | sr_err("Failed to set up device for acquisition."); | |
569 | clear_acquisition_state(sdi); | |
570 | return ret; | |
571 | } | |
572 | /* Register event source for asynchronous USB I/O. */ | |
573 | ret = usb_source_add(sdi->session, drvc->sr_ctx, POLL_INTERVAL, | |
574 | &transfer_event, (struct sr_dev_inst *)sdi); | |
575 | if (ret != SR_OK) { | |
576 | clear_acquisition_state(sdi); | |
577 | return ret; | |
578 | } | |
579 | ret = submit_request(sdi, STATE_START_CAPTURE); | |
580 | ||
581 | if (ret == SR_OK) { | |
582 | /* Send header packet to the session bus. */ | |
583 | ret = std_session_send_df_header(sdi, LOG_PREFIX); | |
584 | } | |
585 | if (ret != SR_OK) { | |
586 | usb_source_remove(sdi->session, drvc->sr_ctx); | |
587 | clear_acquisition_state(sdi); | |
588 | } | |
589 | return ret; | |
590 | } |