]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 Bert Vermeulen <bert@biot.com> | |
5 | * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk> | |
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 "protocol.h" | |
22 | ||
23 | /* Protocol commands */ | |
24 | #define CMD_GET_FW_VERSION 0xb0 | |
25 | #define CMD_START 0xb1 | |
26 | #define CMD_GET_REVID_VERSION 0xb2 | |
27 | ||
28 | #define CMD_START_FLAGS_WIDE_POS 5 | |
29 | #define CMD_START_FLAGS_CLK_SRC_POS 6 | |
30 | ||
31 | #define CMD_START_FLAGS_SAMPLE_8BIT (0 << CMD_START_FLAGS_WIDE_POS) | |
32 | #define CMD_START_FLAGS_SAMPLE_16BIT (1 << CMD_START_FLAGS_WIDE_POS) | |
33 | ||
34 | #define CMD_START_FLAGS_CLK_30MHZ (0 << CMD_START_FLAGS_CLK_SRC_POS) | |
35 | #define CMD_START_FLAGS_CLK_48MHZ (1 << CMD_START_FLAGS_CLK_SRC_POS) | |
36 | ||
37 | #pragma pack(push, 1) | |
38 | ||
39 | struct version_info { | |
40 | uint8_t major; | |
41 | uint8_t minor; | |
42 | }; | |
43 | ||
44 | struct cmd_start_acquisition { | |
45 | uint8_t flags; | |
46 | uint8_t sample_delay_h; | |
47 | uint8_t sample_delay_l; | |
48 | }; | |
49 | ||
50 | #pragma pack(pop) | |
51 | ||
52 | static int command_get_fw_version(libusb_device_handle *devhdl, | |
53 | struct version_info *vi) | |
54 | { | |
55 | int ret; | |
56 | ||
57 | ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR | | |
58 | LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000, | |
59 | (unsigned char *)vi, sizeof(struct version_info), 100); | |
60 | ||
61 | if (ret < 0) { | |
62 | sr_err("Unable to get version info: %s.", | |
63 | libusb_error_name(ret)); | |
64 | return SR_ERR; | |
65 | } | |
66 | ||
67 | return SR_OK; | |
68 | } | |
69 | ||
70 | static int command_get_revid_version(libusb_device_handle *devhdl, | |
71 | uint8_t *revid) | |
72 | { | |
73 | int ret; | |
74 | ||
75 | ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR | | |
76 | LIBUSB_ENDPOINT_IN, CMD_GET_REVID_VERSION, 0x0000, 0x0000, | |
77 | revid, 1, 100); | |
78 | ||
79 | if (ret < 0) { | |
80 | sr_err("Unable to get REVID: %s.", libusb_error_name(ret)); | |
81 | return SR_ERR; | |
82 | } | |
83 | ||
84 | return SR_OK; | |
85 | } | |
86 | ||
87 | SR_PRIV int fx2lafw_command_start_acquisition(libusb_device_handle *devhdl, | |
88 | uint64_t samplerate, gboolean samplewide) | |
89 | { | |
90 | struct cmd_start_acquisition cmd; | |
91 | int delay = 0, ret; | |
92 | ||
93 | /* Compute the sample rate. */ | |
94 | if (samplewide && samplerate > MAX_16BIT_SAMPLE_RATE) { | |
95 | sr_err("Unable to sample at %" PRIu64 "Hz " | |
96 | "when collecting 16-bit samples.", samplerate); | |
97 | return SR_ERR; | |
98 | } | |
99 | ||
100 | if ((SR_MHZ(48) % samplerate) == 0) { | |
101 | cmd.flags = CMD_START_FLAGS_CLK_48MHZ; | |
102 | delay = SR_MHZ(48) / samplerate - 1; | |
103 | if (delay > MAX_SAMPLE_DELAY) | |
104 | delay = 0; | |
105 | } | |
106 | ||
107 | if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) { | |
108 | cmd.flags = CMD_START_FLAGS_CLK_30MHZ; | |
109 | delay = SR_MHZ(30) / samplerate - 1; | |
110 | } | |
111 | ||
112 | sr_info("GPIF delay = %d, clocksource = %sMHz.", delay, | |
113 | (cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30"); | |
114 | ||
115 | if (delay <= 0 || delay > MAX_SAMPLE_DELAY) { | |
116 | sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate); | |
117 | return SR_ERR; | |
118 | } | |
119 | ||
120 | cmd.sample_delay_h = (delay >> 8) & 0xff; | |
121 | cmd.sample_delay_l = delay & 0xff; | |
122 | ||
123 | /* Select the sampling width. */ | |
124 | cmd.flags |= samplewide ? CMD_START_FLAGS_SAMPLE_16BIT : | |
125 | CMD_START_FLAGS_SAMPLE_8BIT; | |
126 | ||
127 | /* Send the control message. */ | |
128 | ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR | | |
129 | LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000, | |
130 | (unsigned char *)&cmd, sizeof(cmd), 100); | |
131 | if (ret < 0) { | |
132 | sr_err("Unable to send start command: %s.", | |
133 | libusb_error_name(ret)); | |
134 | return SR_ERR; | |
135 | } | |
136 | ||
137 | return SR_OK; | |
138 | } | |
139 | ||
140 | /** | |
141 | * Check the USB configuration to determine if this is an fx2lafw device. | |
142 | * | |
143 | * @return TRUE if the device's configuration profile match fx2lafw | |
144 | * configuration, FALSE otherwise. | |
145 | */ | |
146 | SR_PRIV gboolean fx2lafw_check_conf_profile(libusb_device *dev) | |
147 | { | |
148 | struct libusb_device_descriptor des; | |
149 | struct libusb_device_handle *hdl; | |
150 | gboolean ret; | |
151 | unsigned char strdesc[64]; | |
152 | ||
153 | hdl = NULL; | |
154 | ret = FALSE; | |
155 | while (!ret) { | |
156 | /* Assume the FW has not been loaded, unless proven wrong. */ | |
157 | if (libusb_get_device_descriptor(dev, &des) != 0) | |
158 | break; | |
159 | ||
160 | if (libusb_open(dev, &hdl) != 0) | |
161 | break; | |
162 | ||
163 | if (libusb_get_string_descriptor_ascii(hdl, | |
164 | des.iManufacturer, strdesc, sizeof(strdesc)) < 0) | |
165 | break; | |
166 | if (strncmp((const char *)strdesc, "sigrok", 6)) | |
167 | break; | |
168 | ||
169 | if (libusb_get_string_descriptor_ascii(hdl, | |
170 | des.iProduct, strdesc, sizeof(strdesc)) < 0) | |
171 | break; | |
172 | if (strncmp((const char *)strdesc, "fx2lafw", 7)) | |
173 | break; | |
174 | ||
175 | /* If we made it here, it must be an fx2lafw. */ | |
176 | ret = TRUE; | |
177 | } | |
178 | if (hdl) | |
179 | libusb_close(hdl); | |
180 | ||
181 | return ret; | |
182 | } | |
183 | ||
184 | SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di) | |
185 | { | |
186 | libusb_device **devlist; | |
187 | struct sr_usb_dev_inst *usb; | |
188 | struct libusb_device_descriptor des; | |
189 | struct dev_context *devc; | |
190 | struct drv_context *drvc; | |
191 | struct version_info vi; | |
192 | int ret, skip, i, device_count; | |
193 | uint8_t revid; | |
194 | ||
195 | drvc = di->priv; | |
196 | devc = sdi->priv; | |
197 | usb = sdi->conn; | |
198 | ||
199 | if (sdi->status == SR_ST_ACTIVE) | |
200 | /* Device is already in use. */ | |
201 | return SR_ERR; | |
202 | ||
203 | skip = 0; | |
204 | device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); | |
205 | if (device_count < 0) { | |
206 | sr_err("Failed to get device list: %s.", | |
207 | libusb_error_name(device_count)); | |
208 | return SR_ERR; | |
209 | } | |
210 | ||
211 | for (i = 0; i < device_count; i++) { | |
212 | if ((ret = libusb_get_device_descriptor(devlist[i], &des))) { | |
213 | sr_err("Failed to get device descriptor: %s.", | |
214 | libusb_error_name(ret)); | |
215 | continue; | |
216 | } | |
217 | ||
218 | if (des.idVendor != devc->profile->vid | |
219 | || des.idProduct != devc->profile->pid) | |
220 | continue; | |
221 | ||
222 | if (sdi->status == SR_ST_INITIALIZING) { | |
223 | if (skip != sdi->index) { | |
224 | /* Skip devices of this type that aren't the one we want. */ | |
225 | skip += 1; | |
226 | continue; | |
227 | } | |
228 | } else if (sdi->status == SR_ST_INACTIVE) { | |
229 | /* | |
230 | * This device is fully enumerated, so we need to find | |
231 | * this device by vendor, product, bus and address. | |
232 | */ | |
233 | if (libusb_get_bus_number(devlist[i]) != usb->bus | |
234 | || libusb_get_device_address(devlist[i]) != usb->address) | |
235 | /* This is not the one. */ | |
236 | continue; | |
237 | } | |
238 | ||
239 | if (!(ret = libusb_open(devlist[i], &usb->devhdl))) { | |
240 | if (usb->address == 0xff) | |
241 | /* | |
242 | * First time we touch this device after FW | |
243 | * upload, so we don't know the address yet. | |
244 | */ | |
245 | usb->address = libusb_get_device_address(devlist[i]); | |
246 | } else { | |
247 | sr_err("Failed to open device: %s.", | |
248 | libusb_error_name(ret)); | |
249 | break; | |
250 | } | |
251 | ||
252 | ret = command_get_fw_version(usb->devhdl, &vi); | |
253 | if (ret != SR_OK) { | |
254 | sr_err("Failed to get firmware version."); | |
255 | break; | |
256 | } | |
257 | ||
258 | ret = command_get_revid_version(usb->devhdl, &revid); | |
259 | if (ret != SR_OK) { | |
260 | sr_err("Failed to get REVID."); | |
261 | break; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Changes in major version mean incompatible/API changes, so | |
266 | * bail out if we encounter an incompatible version. | |
267 | * Different minor versions are OK, they should be compatible. | |
268 | */ | |
269 | if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) { | |
270 | sr_err("Expected firmware version %d.x, " | |
271 | "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR, | |
272 | vi.major, vi.minor); | |
273 | break; | |
274 | } | |
275 | ||
276 | sdi->status = SR_ST_ACTIVE; | |
277 | sr_info("Opened device %d on %d.%d, " | |
278 | "interface %d, firmware %d.%d.", | |
279 | sdi->index, usb->bus, usb->address, | |
280 | USB_INTERFACE, vi.major, vi.minor); | |
281 | ||
282 | sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.", | |
283 | revid, (revid != 1) ? " (FX2)" : "A (FX2LP)"); | |
284 | ||
285 | break; | |
286 | } | |
287 | libusb_free_device_list(devlist, 1); | |
288 | ||
289 | if (sdi->status != SR_ST_ACTIVE) | |
290 | return SR_ERR; | |
291 | ||
292 | return SR_OK; | |
293 | } | |
294 | ||
295 | SR_PRIV int fx2lafw_configure_probes(const struct sr_dev_inst *sdi) | |
296 | { | |
297 | struct dev_context *devc; | |
298 | struct sr_probe *probe; | |
299 | GSList *l; | |
300 | int probe_bit, stage, i; | |
301 | char *tc; | |
302 | ||
303 | devc = sdi->priv; | |
304 | for (i = 0; i < NUM_TRIGGER_STAGES; i++) { | |
305 | devc->trigger_mask[i] = 0; | |
306 | devc->trigger_value[i] = 0; | |
307 | } | |
308 | ||
309 | stage = -1; | |
310 | for (l = sdi->probes; l; l = l->next) { | |
311 | probe = (struct sr_probe *)l->data; | |
312 | if (probe->enabled == FALSE) | |
313 | continue; | |
314 | ||
315 | if (probe->index > 7) | |
316 | devc->sample_wide = TRUE; | |
317 | ||
318 | probe_bit = 1 << (probe->index); | |
319 | if (!(probe->trigger)) | |
320 | continue; | |
321 | ||
322 | stage = 0; | |
323 | for (tc = probe->trigger; *tc; tc++) { | |
324 | devc->trigger_mask[stage] |= probe_bit; | |
325 | if (*tc == '1') | |
326 | devc->trigger_value[stage] |= probe_bit; | |
327 | stage++; | |
328 | if (stage > NUM_TRIGGER_STAGES) | |
329 | return SR_ERR; | |
330 | } | |
331 | } | |
332 | ||
333 | if (stage == -1) | |
334 | /* | |
335 | * We didn't configure any triggers, make sure acquisition | |
336 | * doesn't wait for any. | |
337 | */ | |
338 | devc->trigger_stage = TRIGGER_FIRED; | |
339 | else | |
340 | devc->trigger_stage = 0; | |
341 | ||
342 | return SR_OK; | |
343 | } | |
344 | ||
345 | SR_PRIV struct dev_context *fx2lafw_dev_new(void) | |
346 | { | |
347 | struct dev_context *devc; | |
348 | ||
349 | if (!(devc = g_try_malloc(sizeof(struct dev_context)))) { | |
350 | sr_err("Device context malloc failed."); | |
351 | return NULL; | |
352 | } | |
353 | ||
354 | devc->profile = NULL; | |
355 | devc->fw_updated = 0; | |
356 | devc->cur_samplerate = 0; | |
357 | devc->limit_samples = 0; | |
358 | devc->sample_wide = 0; | |
359 | ||
360 | return devc; | |
361 | } | |
362 | ||
363 | SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc) | |
364 | { | |
365 | int i; | |
366 | ||
367 | devc->num_samples = -1; | |
368 | ||
369 | for (i = devc->num_transfers - 1; i >= 0; i--) { | |
370 | if (devc->transfers[i]) | |
371 | libusb_cancel_transfer(devc->transfers[i]); | |
372 | } | |
373 | } | |
374 | ||
375 | static void finish_acquisition(struct dev_context *devc) | |
376 | { | |
377 | struct sr_datafeed_packet packet; | |
378 | int i; | |
379 | ||
380 | /* Terminate session. */ | |
381 | packet.type = SR_DF_END; | |
382 | sr_session_send(devc->cb_data, &packet); | |
383 | ||
384 | /* Remove fds from polling. */ | |
385 | for (i = 0; devc->usbfd[i] != -1; i++) | |
386 | sr_source_remove(devc->usbfd[i]); | |
387 | g_free(devc->usbfd); | |
388 | ||
389 | devc->num_transfers = 0; | |
390 | g_free(devc->transfers); | |
391 | } | |
392 | ||
393 | static void free_transfer(struct libusb_transfer *transfer) | |
394 | { | |
395 | struct dev_context *devc; | |
396 | unsigned int i; | |
397 | ||
398 | devc = transfer->user_data; | |
399 | ||
400 | g_free(transfer->buffer); | |
401 | transfer->buffer = NULL; | |
402 | libusb_free_transfer(transfer); | |
403 | ||
404 | for (i = 0; i < devc->num_transfers; i++) { | |
405 | if (devc->transfers[i] == transfer) { | |
406 | devc->transfers[i] = NULL; | |
407 | break; | |
408 | } | |
409 | } | |
410 | ||
411 | devc->submitted_transfers--; | |
412 | if (devc->submitted_transfers == 0) | |
413 | finish_acquisition(devc); | |
414 | } | |
415 | ||
416 | static void resubmit_transfer(struct libusb_transfer *transfer) | |
417 | { | |
418 | int ret; | |
419 | ||
420 | if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS) | |
421 | return; | |
422 | ||
423 | free_transfer(transfer); | |
424 | /* TODO: Stop session? */ | |
425 | ||
426 | sr_err("%s: %s", __func__, libusb_error_name(ret)); | |
427 | } | |
428 | ||
429 | SR_PRIV void fx2lafw_receive_transfer(struct libusb_transfer *transfer) | |
430 | { | |
431 | gboolean packet_has_error = FALSE; | |
432 | struct sr_datafeed_packet packet; | |
433 | struct sr_datafeed_logic logic; | |
434 | struct dev_context *devc; | |
435 | int trigger_offset, i, sample_width, cur_sample_count; | |
436 | int trigger_offset_bytes; | |
437 | uint8_t *cur_buf; | |
438 | ||
439 | devc = transfer->user_data; | |
440 | ||
441 | /* | |
442 | * If acquisition has already ended, just free any queued up | |
443 | * transfer that come in. | |
444 | */ | |
445 | if (devc->num_samples == -1) { | |
446 | free_transfer(transfer); | |
447 | return; | |
448 | } | |
449 | ||
450 | sr_info("receive_transfer(): status %d received %d bytes.", | |
451 | transfer->status, transfer->actual_length); | |
452 | ||
453 | /* Save incoming transfer before reusing the transfer struct. */ | |
454 | cur_buf = transfer->buffer; | |
455 | sample_width = devc->sample_wide ? 2 : 1; | |
456 | cur_sample_count = transfer->actual_length / sample_width; | |
457 | ||
458 | switch (transfer->status) { | |
459 | case LIBUSB_TRANSFER_NO_DEVICE: | |
460 | fx2lafw_abort_acquisition(devc); | |
461 | free_transfer(transfer); | |
462 | return; | |
463 | case LIBUSB_TRANSFER_COMPLETED: | |
464 | case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */ | |
465 | break; | |
466 | default: | |
467 | packet_has_error = TRUE; | |
468 | break; | |
469 | } | |
470 | ||
471 | if (transfer->actual_length == 0 || packet_has_error) { | |
472 | devc->empty_transfer_count++; | |
473 | if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) { | |
474 | /* | |
475 | * The FX2 gave up. End the acquisition, the frontend | |
476 | * will work out that the samplecount is short. | |
477 | */ | |
478 | fx2lafw_abort_acquisition(devc); | |
479 | free_transfer(transfer); | |
480 | } else { | |
481 | resubmit_transfer(transfer); | |
482 | } | |
483 | return; | |
484 | } else { | |
485 | devc->empty_transfer_count = 0; | |
486 | } | |
487 | ||
488 | trigger_offset = 0; | |
489 | if (devc->trigger_stage >= 0) { | |
490 | for (i = 0; i < cur_sample_count; i++) { | |
491 | ||
492 | const uint16_t cur_sample = devc->sample_wide ? | |
493 | *((const uint16_t*)cur_buf + i) : | |
494 | *((const uint8_t*)cur_buf + i); | |
495 | ||
496 | if ((cur_sample & devc->trigger_mask[devc->trigger_stage]) == | |
497 | devc->trigger_value[devc->trigger_stage]) { | |
498 | /* Match on this trigger stage. */ | |
499 | devc->trigger_buffer[devc->trigger_stage] = cur_sample; | |
500 | devc->trigger_stage++; | |
501 | ||
502 | if (devc->trigger_stage == NUM_TRIGGER_STAGES || | |
503 | devc->trigger_mask[devc->trigger_stage] == 0) { | |
504 | /* Match on all trigger stages, we're done. */ | |
505 | trigger_offset = i + 1; | |
506 | ||
507 | /* | |
508 | * TODO: Send pre-trigger buffer to session bus. | |
509 | * Tell the frontend we hit the trigger here. | |
510 | */ | |
511 | packet.type = SR_DF_TRIGGER; | |
512 | packet.payload = NULL; | |
513 | sr_session_send(devc->cb_data, &packet); | |
514 | ||
515 | /* | |
516 | * Send the samples that triggered it, | |
517 | * since we're skipping past them. | |
518 | */ | |
519 | packet.type = SR_DF_LOGIC; | |
520 | packet.payload = &logic; | |
521 | logic.unitsize = sizeof(*devc->trigger_buffer); | |
522 | logic.length = devc->trigger_stage * logic.unitsize; | |
523 | logic.data = devc->trigger_buffer; | |
524 | sr_session_send(devc->cb_data, &packet); | |
525 | ||
526 | devc->trigger_stage = TRIGGER_FIRED; | |
527 | break; | |
528 | } | |
529 | } else if (devc->trigger_stage > 0) { | |
530 | /* | |
531 | * We had a match before, but not in the next sample. However, we may | |
532 | * have a match on this stage in the next bit -- trigger on 0001 will | |
533 | * fail on seeing 00001, so we need to go back to stage 0 -- but at | |
534 | * the next sample from the one that matched originally, which the | |
535 | * counter increment at the end of the loop takes care of. | |
536 | */ | |
537 | i -= devc->trigger_stage; | |
538 | if (i < -1) | |
539 | i = -1; /* Oops, went back past this buffer. */ | |
540 | /* Reset trigger stage. */ | |
541 | devc->trigger_stage = 0; | |
542 | } | |
543 | } | |
544 | } | |
545 | ||
546 | if (devc->trigger_stage == TRIGGER_FIRED) { | |
547 | /* Send the incoming transfer to the session bus. */ | |
548 | trigger_offset_bytes = trigger_offset * sample_width; | |
549 | packet.type = SR_DF_LOGIC; | |
550 | packet.payload = &logic; | |
551 | logic.length = transfer->actual_length - trigger_offset_bytes; | |
552 | logic.unitsize = sample_width; | |
553 | logic.data = cur_buf + trigger_offset_bytes; | |
554 | sr_session_send(devc->cb_data, &packet); | |
555 | ||
556 | devc->num_samples += cur_sample_count; | |
557 | if (devc->limit_samples && | |
558 | (unsigned int)devc->num_samples > devc->limit_samples) { | |
559 | fx2lafw_abort_acquisition(devc); | |
560 | free_transfer(transfer); | |
561 | return; | |
562 | } | |
563 | } else { | |
564 | /* | |
565 | * TODO: Buffer pre-trigger data in capture | |
566 | * ratio-sized buffer. | |
567 | */ | |
568 | } | |
569 | ||
570 | resubmit_transfer(transfer); | |
571 | } | |
572 | ||
573 | static unsigned int to_bytes_per_ms(unsigned int samplerate) | |
574 | { | |
575 | return samplerate / 1000; | |
576 | } | |
577 | ||
578 | SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc) | |
579 | { | |
580 | size_t s; | |
581 | ||
582 | /* | |
583 | * The buffer should be large enough to hold 10ms of data and | |
584 | * a multiple of 512. | |
585 | */ | |
586 | s = 10 * to_bytes_per_ms(devc->cur_samplerate); | |
587 | return (s + 511) & ~511; | |
588 | } | |
589 | ||
590 | SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc) | |
591 | { | |
592 | unsigned int n; | |
593 | ||
594 | /* Total buffer size should be able to hold about 500ms of data. */ | |
595 | n = (500 * to_bytes_per_ms(devc->cur_samplerate) / | |
596 | fx2lafw_get_buffer_size(devc)); | |
597 | ||
598 | if (n > NUM_SIMUL_TRANSFERS) | |
599 | return NUM_SIMUL_TRANSFERS; | |
600 | ||
601 | return n; | |
602 | } | |
603 | ||
604 | SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc) | |
605 | { | |
606 | size_t total_size; | |
607 | unsigned int timeout; | |
608 | ||
609 | total_size = fx2lafw_get_buffer_size(devc) * | |
610 | fx2lafw_get_number_of_transfers(devc); | |
611 | timeout = total_size / to_bytes_per_ms(devc->cur_samplerate); | |
612 | return timeout + timeout / 4; /* Leave a headroom of 25% percent. */ | |
613 | } |