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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 "protocol.h" | |
23 | ||
24 | /* Bit mask for the RLE repeat-count-follows flag. */ | |
25 | #define RLE_FLAG_LEN_FOLLOWS ((uint64_t)1 << 35) | |
26 | ||
27 | /* Start address of capture status memory area to read. */ | |
28 | #define CAP_STAT_ADDR 5 | |
29 | ||
30 | /* Number of 64-bit words read from the capture status memory. */ | |
31 | #define CAP_STAT_LEN 5 | |
32 | ||
33 | /* The bitstream filenames are indexed by the clock_config enumeration. | |
34 | */ | |
35 | static const char bitstream_map[][32] = { | |
36 | "sysclk-lwla1034-off.rbf", | |
37 | "sysclk-lwla1034-int.rbf", | |
38 | "sysclk-lwla1034-extpos.rbf", | |
39 | "sysclk-lwla1034-extneg.rbf", | |
40 | }; | |
41 | ||
42 | /* Submit an already filled-in USB transfer. | |
43 | */ | |
44 | static int submit_transfer(struct dev_context *devc, | |
45 | struct libusb_transfer *xfer) | |
46 | { | |
47 | int ret; | |
48 | ||
49 | ret = libusb_submit_transfer(xfer); | |
50 | ||
51 | if (ret != 0) { | |
52 | sr_err("Submit transfer failed: %s.", libusb_error_name(ret)); | |
53 | devc->transfer_error = TRUE; | |
54 | return SR_ERR; | |
55 | } | |
56 | ||
57 | return SR_OK; | |
58 | } | |
59 | ||
60 | /* Set up the LWLA in preparation for an acquisition session. | |
61 | */ | |
62 | static int capture_setup(const struct sr_dev_inst *sdi) | |
63 | { | |
64 | struct dev_context *devc; | |
65 | struct acquisition_state *acq; | |
66 | uint64_t divider_count; | |
67 | uint64_t trigger_mask; | |
68 | uint64_t memory_limit; | |
69 | uint16_t command[3 + (10 * 4)]; | |
70 | ||
71 | devc = sdi->priv; | |
72 | acq = devc->acquisition; | |
73 | ||
74 | command[0] = LWLA_WORD(CMD_CAP_SETUP); | |
75 | command[1] = LWLA_WORD(0); /* address */ | |
76 | command[2] = LWLA_WORD(10); /* length */ | |
77 | ||
78 | command[3] = LWLA_WORD_0(devc->channel_mask); | |
79 | command[4] = LWLA_WORD_1(devc->channel_mask); | |
80 | command[5] = LWLA_WORD_2(devc->channel_mask); | |
81 | command[6] = LWLA_WORD_3(devc->channel_mask); | |
82 | ||
83 | /* Set the clock divide counter maximum for samplerates of up to | |
84 | * 100 MHz. At the highest samplerate of 125 MHz the clock divider | |
85 | * is bypassed. | |
86 | */ | |
87 | if (!acq->bypass_clockdiv && devc->samplerate > 0) | |
88 | divider_count = SR_MHZ(100) / devc->samplerate - 1; | |
89 | else | |
90 | divider_count = 0; | |
91 | ||
92 | command[7] = LWLA_WORD_0(divider_count); | |
93 | command[8] = LWLA_WORD_1(divider_count); | |
94 | command[9] = LWLA_WORD_2(divider_count); | |
95 | command[10] = LWLA_WORD_3(divider_count); | |
96 | ||
97 | command[11] = LWLA_WORD_0(devc->trigger_values); | |
98 | command[12] = LWLA_WORD_1(devc->trigger_values); | |
99 | command[13] = LWLA_WORD_2(devc->trigger_values); | |
100 | command[14] = LWLA_WORD_3(devc->trigger_values); | |
101 | ||
102 | command[15] = LWLA_WORD_0(devc->trigger_edge_mask); | |
103 | command[16] = LWLA_WORD_1(devc->trigger_edge_mask); | |
104 | command[17] = LWLA_WORD_2(devc->trigger_edge_mask); | |
105 | command[18] = LWLA_WORD_3(devc->trigger_edge_mask); | |
106 | ||
107 | trigger_mask = devc->trigger_mask; | |
108 | /* Set bits to select external TRG input edge. */ | |
109 | if (devc->cfg_trigger_source == TRIGGER_EXT_TRG) | |
110 | switch (devc->cfg_trigger_slope) { | |
111 | case EDGE_POSITIVE: | |
112 | trigger_mask |= (uint64_t)1 << 35; | |
113 | break; | |
114 | case EDGE_NEGATIVE: | |
115 | trigger_mask |= (uint64_t)1 << 34; | |
116 | break; | |
117 | } | |
118 | ||
119 | command[19] = LWLA_WORD_0(trigger_mask); | |
120 | command[20] = LWLA_WORD_1(trigger_mask); | |
121 | command[21] = LWLA_WORD_2(trigger_mask); | |
122 | command[22] = LWLA_WORD_3(trigger_mask); | |
123 | ||
124 | /* Set the capture memory full threshold. This is slightly less | |
125 | * than the actual maximum, most likely in order to compensate for | |
126 | * pipeline latency. | |
127 | */ | |
128 | memory_limit = MEMORY_DEPTH - 16; | |
129 | ||
130 | command[23] = LWLA_WORD_0(memory_limit); | |
131 | command[24] = LWLA_WORD_1(memory_limit); | |
132 | command[25] = LWLA_WORD_2(memory_limit); | |
133 | command[26] = LWLA_WORD_3(memory_limit); | |
134 | ||
135 | /* Fill remaining words with zeroes. */ | |
136 | memset(&command[27], 0, sizeof(command) - 27 * sizeof(command[0])); | |
137 | ||
138 | return lwla_send_command(sdi->conn, command, ARRAY_SIZE(command)); | |
139 | } | |
140 | ||
141 | /* Issue a register write command as an asynchronous USB transfer. | |
142 | */ | |
143 | static int issue_write_reg(const struct sr_dev_inst *sdi, | |
144 | unsigned int reg, unsigned int value) | |
145 | { | |
146 | struct dev_context *devc; | |
147 | struct acquisition_state *acq; | |
148 | ||
149 | devc = sdi->priv; | |
150 | acq = devc->acquisition; | |
151 | ||
152 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_WRITE_REG); | |
153 | acq->xfer_buf_out[1] = LWLA_WORD(reg); | |
154 | acq->xfer_buf_out[2] = LWLA_WORD_0(value); | |
155 | acq->xfer_buf_out[3] = LWLA_WORD_1(value); | |
156 | ||
157 | acq->xfer_out->length = 4 * sizeof(uint16_t); | |
158 | ||
159 | return submit_transfer(devc, acq->xfer_out); | |
160 | } | |
161 | ||
162 | /* Issue a register write command as an asynchronous USB transfer for the | |
163 | * next register/value pair of the currently active register write sequence. | |
164 | */ | |
165 | static int issue_next_write_reg(const struct sr_dev_inst *sdi) | |
166 | { | |
167 | struct dev_context *devc; | |
168 | struct regval_pair *regval; | |
169 | int ret; | |
170 | ||
171 | devc = sdi->priv; | |
172 | ||
173 | if (devc->reg_write_pos >= devc->reg_write_len) { | |
174 | sr_err("Already written all registers in sequence."); | |
175 | return SR_ERR_BUG; | |
176 | } | |
177 | regval = &devc->reg_write_seq[devc->reg_write_pos]; | |
178 | ||
179 | ret = issue_write_reg(sdi, regval->reg, regval->val); | |
180 | if (ret != SR_OK) | |
181 | return ret; | |
182 | ||
183 | ++devc->reg_write_pos; | |
184 | return SR_OK; | |
185 | } | |
186 | ||
187 | /* Issue a capture status request as an asynchronous USB transfer. | |
188 | */ | |
189 | static void request_capture_status(const struct sr_dev_inst *sdi) | |
190 | { | |
191 | struct dev_context *devc; | |
192 | struct acquisition_state *acq; | |
193 | ||
194 | devc = sdi->priv; | |
195 | acq = devc->acquisition; | |
196 | ||
197 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_CAP_STATUS); | |
198 | acq->xfer_buf_out[1] = LWLA_WORD(CAP_STAT_ADDR); | |
199 | acq->xfer_buf_out[2] = LWLA_WORD(CAP_STAT_LEN); | |
200 | ||
201 | acq->xfer_out->length = 3 * sizeof(uint16_t); | |
202 | ||
203 | if (submit_transfer(devc, acq->xfer_out) == SR_OK) | |
204 | devc->state = STATE_STATUS_REQUEST; | |
205 | } | |
206 | ||
207 | /* Issue a request for the capture buffer fill level as | |
208 | * an asynchronous USB transfer. | |
209 | */ | |
210 | static void request_capture_length(const struct sr_dev_inst *sdi) | |
211 | { | |
212 | struct dev_context *devc; | |
213 | struct acquisition_state *acq; | |
214 | ||
215 | devc = sdi->priv; | |
216 | acq = devc->acquisition; | |
217 | ||
218 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_REG); | |
219 | acq->xfer_buf_out[1] = LWLA_WORD(REG_MEM_FILL); | |
220 | ||
221 | acq->xfer_out->length = 2 * sizeof(uint16_t); | |
222 | ||
223 | if (submit_transfer(devc, acq->xfer_out) == SR_OK) | |
224 | devc->state = STATE_LENGTH_REQUEST; | |
225 | } | |
226 | ||
227 | /* Initiate the capture memory read operation: Reset the acquisition state | |
228 | * and start a sequence of register writes in order to set up the device for | |
229 | * reading from the capture buffer. | |
230 | */ | |
231 | static void issue_read_start(const struct sr_dev_inst *sdi) | |
232 | { | |
233 | struct dev_context *devc; | |
234 | struct acquisition_state *acq; | |
235 | struct regval_pair *regvals; | |
236 | ||
237 | devc = sdi->priv; | |
238 | acq = devc->acquisition; | |
239 | ||
240 | /* Reset RLE state. */ | |
241 | acq->rle = RLE_STATE_DATA; | |
242 | acq->sample = 0; | |
243 | acq->run_len = 0; | |
244 | ||
245 | acq->samples_done = 0; | |
246 | ||
247 | /* For some reason, the start address is 4 rather than 0. */ | |
248 | acq->mem_addr_done = 4; | |
249 | acq->mem_addr_next = 4; | |
250 | acq->mem_addr_stop = acq->mem_addr_fill; | |
251 | ||
252 | /* Sample position in the packet output buffer. */ | |
253 | acq->out_index = 0; | |
254 | ||
255 | regvals = devc->reg_write_seq; | |
256 | ||
257 | regvals[0].reg = REG_DIV_BYPASS; | |
258 | regvals[0].val = 1; | |
259 | ||
260 | regvals[1].reg = REG_MEM_CTRL; | |
261 | regvals[1].val = MEM_CTRL_CLR_IDX; | |
262 | ||
263 | regvals[2].reg = REG_MEM_START; | |
264 | regvals[2].val = 4; | |
265 | ||
266 | devc->reg_write_pos = 0; | |
267 | devc->reg_write_len = 3; | |
268 | ||
269 | if (issue_next_write_reg(sdi) == SR_OK) | |
270 | devc->state = STATE_READ_PREPARE; | |
271 | } | |
272 | ||
273 | /* Issue a command as an asynchronous USB transfer which returns the device | |
274 | * to normal state after a read operation. Sets a new device context state | |
275 | * on success. | |
276 | */ | |
277 | static void issue_read_end(const struct sr_dev_inst *sdi) | |
278 | { | |
279 | struct dev_context *devc; | |
280 | ||
281 | devc = sdi->priv; | |
282 | ||
283 | if (issue_write_reg(sdi, REG_DIV_BYPASS, 0) == SR_OK) | |
284 | devc->state = STATE_READ_END; | |
285 | } | |
286 | ||
287 | /* Decode an incoming response to a buffer fill level request and act on it | |
288 | * as appropriate. Note that this function changes the device context state. | |
289 | */ | |
290 | static void process_capture_length(const struct sr_dev_inst *sdi) | |
291 | { | |
292 | struct dev_context *devc; | |
293 | struct acquisition_state *acq; | |
294 | ||
295 | devc = sdi->priv; | |
296 | acq = devc->acquisition; | |
297 | ||
298 | if (acq->xfer_in->actual_length != 4) { | |
299 | sr_err("Received size %d doesn't match expected size 4.", | |
300 | acq->xfer_in->actual_length); | |
301 | devc->transfer_error = TRUE; | |
302 | return; | |
303 | } | |
304 | acq->mem_addr_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]); | |
305 | ||
306 | sr_dbg("%zu words in capture buffer.", acq->mem_addr_fill); | |
307 | ||
308 | if (acq->mem_addr_fill > 0 && !devc->cancel_requested) | |
309 | issue_read_start(sdi); | |
310 | else | |
311 | issue_read_end(sdi); | |
312 | } | |
313 | ||
314 | /* Initiate a sequence of register write commands with the effect of | |
315 | * cancelling a running capture operation. This sets a new device state | |
316 | * if issuing the first command succeeds. | |
317 | */ | |
318 | static void issue_stop_capture(const struct sr_dev_inst *sdi) | |
319 | { | |
320 | struct dev_context *devc; | |
321 | struct regval_pair *regvals; | |
322 | ||
323 | devc = sdi->priv; | |
324 | ||
325 | if (devc->stopping_in_progress) | |
326 | return; | |
327 | ||
328 | regvals = devc->reg_write_seq; | |
329 | ||
330 | regvals[0].reg = REG_LONG_ADDR; | |
331 | regvals[0].val = LREG_CAP_CTRL; | |
332 | ||
333 | regvals[1].reg = REG_LONG_LOW; | |
334 | regvals[1].val = 0; | |
335 | ||
336 | regvals[2].reg = REG_LONG_HIGH; | |
337 | regvals[2].val = 0; | |
338 | ||
339 | regvals[3].reg = REG_LONG_STROBE; | |
340 | regvals[3].val = 0; | |
341 | ||
342 | regvals[4].reg = REG_DIV_BYPASS; | |
343 | regvals[4].val = 0; | |
344 | ||
345 | devc->reg_write_pos = 0; | |
346 | devc->reg_write_len = 5; | |
347 | ||
348 | if (issue_next_write_reg(sdi) == SR_OK) { | |
349 | devc->stopping_in_progress = TRUE; | |
350 | devc->state = STATE_STOP_CAPTURE; | |
351 | } | |
352 | } | |
353 | ||
354 | /* Decode an incoming capture status response and act on it as appropriate. | |
355 | * Note that this function changes the device state. | |
356 | */ | |
357 | static void process_capture_status(const struct sr_dev_inst *sdi) | |
358 | { | |
359 | uint64_t duration; | |
360 | struct dev_context *devc; | |
361 | struct acquisition_state *acq; | |
362 | unsigned int mem_fill; | |
363 | unsigned int flags; | |
364 | ||
365 | devc = sdi->priv; | |
366 | acq = devc->acquisition; | |
367 | ||
368 | if (acq->xfer_in->actual_length != CAP_STAT_LEN * 8) { | |
369 | sr_err("Received size %d doesn't match expected size %d.", | |
370 | acq->xfer_in->actual_length, CAP_STAT_LEN * 8); | |
371 | devc->transfer_error = TRUE; | |
372 | return; | |
373 | } | |
374 | ||
375 | mem_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]); | |
376 | duration = LWLA_TO_UINT32(acq->xfer_buf_in[4]) | |
377 | | ((uint64_t)LWLA_TO_UINT32(acq->xfer_buf_in[5]) << 32); | |
378 | flags = LWLA_TO_UINT32(acq->xfer_buf_in[8]) & STATUS_FLAG_MASK; | |
379 | ||
380 | /* The LWLA1034 runs at 125 MHz if the clock divider is bypassed. | |
381 | * However, the time base used for the duration is apparently not | |
382 | * adjusted for this "boost" mode. Whereas normally the duration | |
383 | * unit is 1 ms, it is 0.8 ms when the clock divider is bypassed. | |
384 | * As 0.8 = 100 MHz / 125 MHz, it seems that the internal cycle | |
385 | * counter period is the same as at the 100 MHz setting. | |
386 | */ | |
387 | if (acq->bypass_clockdiv) | |
388 | acq->duration_now = duration * 4 / 5; | |
389 | else | |
390 | acq->duration_now = duration; | |
391 | ||
392 | sr_spew("Captured %u words, %" PRIu64 " ms, flags 0x%02X.", | |
393 | mem_fill, acq->duration_now, flags); | |
394 | ||
395 | if ((flags & STATUS_TRIGGERED) > (acq->capture_flags & STATUS_TRIGGERED)) | |
396 | sr_info("Capture triggered."); | |
397 | ||
398 | acq->capture_flags = flags; | |
399 | ||
400 | if (acq->duration_now >= acq->duration_max) { | |
401 | sr_dbg("Time limit reached, stopping capture."); | |
402 | issue_stop_capture(sdi); | |
403 | return; | |
404 | } | |
405 | devc->state = STATE_STATUS_WAIT; | |
406 | ||
407 | if ((acq->capture_flags & STATUS_TRIGGERED) == 0) { | |
408 | sr_spew("Waiting for trigger."); | |
409 | } else if ((acq->capture_flags & STATUS_MEM_AVAIL) == 0) { | |
410 | sr_dbg("Capture memory filled."); | |
411 | request_capture_length(sdi); | |
412 | } else if ((acq->capture_flags & STATUS_CAPTURING) != 0) { | |
413 | sr_spew("Sampling in progress."); | |
414 | } | |
415 | } | |
416 | ||
417 | /* Issue a capture buffer read request as an asynchronous USB transfer. | |
418 | * The address and size of the memory area to read are derived from the | |
419 | * current acquisition state. | |
420 | */ | |
421 | static void request_read_mem(const struct sr_dev_inst *sdi) | |
422 | { | |
423 | struct dev_context *devc; | |
424 | struct acquisition_state *acq; | |
425 | size_t count; | |
426 | ||
427 | devc = sdi->priv; | |
428 | acq = devc->acquisition; | |
429 | ||
430 | if (acq->mem_addr_next >= acq->mem_addr_stop) | |
431 | return; | |
432 | ||
433 | /* Always read a multiple of 8 device words. */ | |
434 | count = (acq->mem_addr_stop - acq->mem_addr_next + 7) / 8 * 8; | |
435 | count = MIN(count, READ_CHUNK_LEN); | |
436 | ||
437 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_MEM); | |
438 | acq->xfer_buf_out[1] = LWLA_WORD_0(acq->mem_addr_next); | |
439 | acq->xfer_buf_out[2] = LWLA_WORD_1(acq->mem_addr_next); | |
440 | acq->xfer_buf_out[3] = LWLA_WORD_0(count); | |
441 | acq->xfer_buf_out[4] = LWLA_WORD_1(count); | |
442 | ||
443 | acq->xfer_out->length = 5 * sizeof(uint16_t); | |
444 | ||
445 | if (submit_transfer(devc, acq->xfer_out) == SR_OK) { | |
446 | acq->mem_addr_next += count; | |
447 | devc->state = STATE_READ_REQUEST; | |
448 | } | |
449 | } | |
450 | ||
451 | /* Demangle and decompress incoming sample data from the capture buffer. | |
452 | * The data chunk is taken from the acquisition state, and is expected to | |
453 | * contain a multiple of 8 device words. | |
454 | * All data currently in the acquisition buffer will be processed. Packets | |
455 | * of decoded samples are sent off to the session bus whenever the output | |
456 | * buffer becomes full while decoding. | |
457 | */ | |
458 | static int process_sample_data(const struct sr_dev_inst *sdi) | |
459 | { | |
460 | uint64_t sample; | |
461 | uint64_t high_nibbles; | |
462 | uint64_t word; | |
463 | struct dev_context *devc; | |
464 | struct acquisition_state *acq; | |
465 | uint8_t *out_p; | |
466 | uint32_t *slice; | |
467 | struct sr_datafeed_packet packet; | |
468 | struct sr_datafeed_logic logic; | |
469 | size_t expect_len; | |
470 | size_t actual_len; | |
471 | size_t out_max_samples; | |
472 | size_t out_run_samples; | |
473 | size_t ri; | |
474 | size_t in_words_left; | |
475 | size_t si; | |
476 | ||
477 | devc = sdi->priv; | |
478 | acq = devc->acquisition; | |
479 | ||
480 | if (acq->mem_addr_done >= acq->mem_addr_stop | |
481 | || acq->samples_done >= acq->samples_max) | |
482 | return SR_OK; | |
483 | ||
484 | in_words_left = MIN(acq->mem_addr_stop - acq->mem_addr_done, | |
485 | READ_CHUNK_LEN); | |
486 | expect_len = LWLA1034_MEMBUF_LEN(in_words_left) * sizeof(uint32_t); | |
487 | actual_len = acq->xfer_in->actual_length; | |
488 | ||
489 | if (actual_len != expect_len) { | |
490 | sr_err("Received size %zu does not match expected size %zu.", | |
491 | actual_len, expect_len); | |
492 | devc->transfer_error = TRUE; | |
493 | return SR_ERR; | |
494 | } | |
495 | acq->mem_addr_done += in_words_left; | |
496 | ||
497 | /* Prepare session packet. */ | |
498 | packet.type = SR_DF_LOGIC; | |
499 | packet.payload = &logic; | |
500 | logic.unitsize = UNIT_SIZE; | |
501 | logic.data = acq->out_packet; | |
502 | ||
503 | slice = acq->xfer_buf_in; | |
504 | si = 0; /* word index within slice */ | |
505 | ||
506 | for (;;) { | |
507 | /* Calculate number of samples to write into packet. */ | |
508 | out_max_samples = MIN(acq->samples_max - acq->samples_done, | |
509 | PACKET_LENGTH - acq->out_index); | |
510 | out_run_samples = MIN(acq->run_len, out_max_samples); | |
511 | ||
512 | /* Expand run-length samples into session packet. */ | |
513 | sample = acq->sample; | |
514 | out_p = &acq->out_packet[acq->out_index * UNIT_SIZE]; | |
515 | ||
516 | for (ri = 0; ri < out_run_samples; ++ri) { | |
517 | out_p[0] = sample & 0xFF; | |
518 | out_p[1] = (sample >> 8) & 0xFF; | |
519 | out_p[2] = (sample >> 16) & 0xFF; | |
520 | out_p[3] = (sample >> 24) & 0xFF; | |
521 | out_p[4] = (sample >> 32) & 0xFF; | |
522 | out_p += UNIT_SIZE; | |
523 | } | |
524 | acq->run_len -= out_run_samples; | |
525 | acq->out_index += out_run_samples; | |
526 | acq->samples_done += out_run_samples; | |
527 | ||
528 | /* Packet full or sample count limit reached? */ | |
529 | if (out_run_samples == out_max_samples) { | |
530 | logic.length = acq->out_index * UNIT_SIZE; | |
531 | sr_session_send(sdi, &packet); | |
532 | acq->out_index = 0; | |
533 | ||
534 | if (acq->samples_done >= acq->samples_max) | |
535 | return SR_OK; /* sample limit reached */ | |
536 | if (acq->run_len > 0) | |
537 | continue; /* need another packet */ | |
538 | } | |
539 | ||
540 | if (in_words_left == 0) | |
541 | break; /* done with current chunk */ | |
542 | ||
543 | /* Now work on the current slice. */ | |
544 | high_nibbles = LWLA_TO_UINT32(slice[8]); | |
545 | word = LWLA_TO_UINT32(slice[si]); | |
546 | word |= (high_nibbles << (4 * si + 4)) & ((uint64_t)0xF << 32); | |
547 | ||
548 | if (acq->rle == RLE_STATE_DATA) { | |
549 | acq->sample = word & ALL_CHANNELS_MASK; | |
550 | acq->run_len = ((word >> NUM_CHANNELS) & 1) + 1; | |
551 | if (word & RLE_FLAG_LEN_FOLLOWS) | |
552 | acq->rle = RLE_STATE_LEN; | |
553 | } else { | |
554 | acq->run_len += word << 1; | |
555 | acq->rle = RLE_STATE_DATA; | |
556 | } | |
557 | ||
558 | /* Move to next word. */ | |
559 | si = (si + 1) % 8; | |
560 | if (si == 0) | |
561 | slice += 9; | |
562 | --in_words_left; | |
563 | } | |
564 | ||
565 | /* Send out partially filled packet if this was the last chunk. */ | |
566 | if (acq->mem_addr_done >= acq->mem_addr_stop && acq->out_index > 0) { | |
567 | logic.length = acq->out_index * UNIT_SIZE; | |
568 | sr_session_send(sdi, &packet); | |
569 | acq->out_index = 0; | |
570 | } | |
571 | return SR_OK; | |
572 | } | |
573 | ||
574 | /* Finish an acquisition session. This sends the end packet to the session | |
575 | * bus and removes the listener for asynchronous USB transfers. | |
576 | */ | |
577 | static void end_acquisition(struct sr_dev_inst *sdi) | |
578 | { | |
579 | struct drv_context *drvc; | |
580 | struct dev_context *devc; | |
581 | struct sr_datafeed_packet packet; | |
582 | ||
583 | drvc = sdi->driver->context; | |
584 | devc = sdi->priv; | |
585 | ||
586 | if (devc->state == STATE_IDLE) | |
587 | return; | |
588 | ||
589 | devc->state = STATE_IDLE; | |
590 | ||
591 | /* Remove USB file descriptors from polling. */ | |
592 | usb_source_remove(sdi->session, drvc->sr_ctx); | |
593 | ||
594 | packet.type = SR_DF_END; | |
595 | sr_session_send(sdi, &packet); | |
596 | ||
597 | lwla_free_acquisition_state(devc->acquisition); | |
598 | devc->acquisition = NULL; | |
599 | devc->cancel_requested = FALSE; | |
600 | } | |
601 | ||
602 | /* USB output transfer completion callback. | |
603 | */ | |
604 | static void LIBUSB_CALL receive_transfer_out(struct libusb_transfer *transfer) | |
605 | { | |
606 | struct sr_dev_inst *sdi; | |
607 | struct dev_context *devc; | |
608 | ||
609 | sdi = transfer->user_data; | |
610 | devc = sdi->priv; | |
611 | ||
612 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) { | |
613 | sr_err("Transfer to device failed: %d.", transfer->status); | |
614 | devc->transfer_error = TRUE; | |
615 | return; | |
616 | } | |
617 | ||
618 | if (devc->reg_write_pos < devc->reg_write_len) { | |
619 | issue_next_write_reg(sdi); | |
620 | } else { | |
621 | switch (devc->state) { | |
622 | case STATE_START_CAPTURE: | |
623 | devc->state = STATE_STATUS_WAIT; | |
624 | break; | |
625 | case STATE_STATUS_REQUEST: | |
626 | devc->state = STATE_STATUS_RESPONSE; | |
627 | submit_transfer(devc, devc->acquisition->xfer_in); | |
628 | break; | |
629 | case STATE_STOP_CAPTURE: | |
630 | if (!devc->cancel_requested) | |
631 | request_capture_length(sdi); | |
632 | else | |
633 | end_acquisition(sdi); | |
634 | break; | |
635 | case STATE_LENGTH_REQUEST: | |
636 | devc->state = STATE_LENGTH_RESPONSE; | |
637 | submit_transfer(devc, devc->acquisition->xfer_in); | |
638 | break; | |
639 | case STATE_READ_PREPARE: | |
640 | request_read_mem(sdi); | |
641 | break; | |
642 | case STATE_READ_REQUEST: | |
643 | devc->state = STATE_READ_RESPONSE; | |
644 | submit_transfer(devc, devc->acquisition->xfer_in); | |
645 | break; | |
646 | case STATE_READ_END: | |
647 | end_acquisition(sdi); | |
648 | break; | |
649 | default: | |
650 | sr_err("Unexpected device state %d.", devc->state); | |
651 | break; | |
652 | } | |
653 | } | |
654 | } | |
655 | ||
656 | /* USB input transfer completion callback. | |
657 | */ | |
658 | static void LIBUSB_CALL receive_transfer_in(struct libusb_transfer *transfer) | |
659 | { | |
660 | struct sr_dev_inst *sdi; | |
661 | struct dev_context *devc; | |
662 | struct acquisition_state *acq; | |
663 | ||
664 | sdi = transfer->user_data; | |
665 | devc = sdi->priv; | |
666 | acq = devc->acquisition; | |
667 | ||
668 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) { | |
669 | sr_err("Transfer from device failed: %d.", transfer->status); | |
670 | devc->transfer_error = TRUE; | |
671 | return; | |
672 | } | |
673 | ||
674 | switch (devc->state) { | |
675 | case STATE_STATUS_RESPONSE: | |
676 | process_capture_status(sdi); | |
677 | break; | |
678 | case STATE_LENGTH_RESPONSE: | |
679 | process_capture_length(sdi); | |
680 | break; | |
681 | case STATE_READ_RESPONSE: | |
682 | if (process_sample_data(sdi) == SR_OK | |
683 | && acq->mem_addr_next < acq->mem_addr_stop | |
684 | && acq->samples_done < acq->samples_max) | |
685 | request_read_mem(sdi); | |
686 | else | |
687 | issue_read_end(sdi); | |
688 | break; | |
689 | default: | |
690 | sr_err("Unexpected device state %d.", devc->state); | |
691 | break; | |
692 | } | |
693 | } | |
694 | ||
695 | /* Initialize the LWLA. This downloads a bitstream into the FPGA | |
696 | * and executes a simple device test sequence. | |
697 | */ | |
698 | SR_PRIV int lwla_init_device(const struct sr_dev_inst *sdi) | |
699 | { | |
700 | uint64_t value; | |
701 | struct dev_context *devc; | |
702 | int ret; | |
703 | ||
704 | devc = sdi->priv; | |
705 | ||
706 | /* Force reload of bitstream */ | |
707 | devc->cur_clock_config = CONF_CLOCK_NONE; | |
708 | ||
709 | ret = lwla_set_clock_config(sdi); | |
710 | if (ret != SR_OK) | |
711 | return ret; | |
712 | ||
713 | ret = lwla_read_long_reg(sdi->conn, LREG_TEST_ID, &value); | |
714 | if (ret != SR_OK) | |
715 | return ret; | |
716 | ||
717 | /* Ignore the value returned by the first read */ | |
718 | ret = lwla_read_long_reg(sdi->conn, LREG_TEST_ID, &value); | |
719 | if (ret != SR_OK) | |
720 | return ret; | |
721 | ||
722 | if (value != UINT64_C(0x1234567887654321)) { | |
723 | sr_err("Received invalid test word 0x%016" PRIX64 ".", value); | |
724 | return SR_ERR; | |
725 | } | |
726 | return SR_OK; | |
727 | } | |
728 | ||
729 | /* Select the LWLA clock configuration. If the clock source changed from | |
730 | * the previous setting, this will download a new bitstream to the FPGA. | |
731 | */ | |
732 | SR_PRIV int lwla_set_clock_config(const struct sr_dev_inst *sdi) | |
733 | { | |
734 | struct dev_context *devc; | |
735 | struct drv_context *drvc; | |
736 | int ret; | |
737 | enum clock_config choice; | |
738 | ||
739 | devc = sdi->priv; | |
740 | drvc = sdi->driver->context; | |
741 | ||
742 | if (sdi->status == SR_ST_INACTIVE) | |
743 | choice = CONF_CLOCK_NONE; | |
744 | else if (devc->cfg_clock_source == CLOCK_INTERNAL) | |
745 | choice = CONF_CLOCK_INT; | |
746 | else if (devc->cfg_clock_edge == EDGE_POSITIVE) | |
747 | choice = CONF_CLOCK_EXT_RISE; | |
748 | else | |
749 | choice = CONF_CLOCK_EXT_FALL; | |
750 | ||
751 | if (choice != devc->cur_clock_config) { | |
752 | devc->cur_clock_config = CONF_CLOCK_NONE; | |
753 | ret = lwla_send_bitstream(drvc->sr_ctx, sdi->conn, | |
754 | bitstream_map[choice]); | |
755 | if (ret == SR_OK) | |
756 | devc->cur_clock_config = choice; | |
757 | return ret; | |
758 | } | |
759 | return SR_OK; | |
760 | } | |
761 | ||
762 | /* Configure the LWLA in preparation for an acquisition session. | |
763 | */ | |
764 | SR_PRIV int lwla_setup_acquisition(const struct sr_dev_inst *sdi) | |
765 | { | |
766 | struct dev_context *devc; | |
767 | struct sr_usb_dev_inst *usb; | |
768 | struct acquisition_state *acq; | |
769 | struct regval_pair regvals[7]; | |
770 | int ret; | |
771 | ||
772 | devc = sdi->priv; | |
773 | usb = sdi->conn; | |
774 | acq = devc->acquisition; | |
775 | ||
776 | if (devc->limit_msec > 0) { | |
777 | acq->duration_max = devc->limit_msec; | |
778 | sr_info("Acquisition time limit %" PRIu64 " ms.", | |
779 | devc->limit_msec); | |
780 | } else | |
781 | acq->duration_max = MAX_LIMIT_MSEC; | |
782 | ||
783 | if (devc->limit_samples > 0) { | |
784 | acq->samples_max = devc->limit_samples; | |
785 | sr_info("Acquisition sample count limit %" PRIu64 ".", | |
786 | devc->limit_samples); | |
787 | } else | |
788 | acq->samples_max = MAX_LIMIT_SAMPLES; | |
789 | ||
790 | if (devc->cfg_clock_source == CLOCK_INTERNAL) { | |
791 | sr_info("Internal clock, samplerate %" PRIu64 ".", | |
792 | devc->samplerate); | |
793 | if (devc->samplerate == 0) | |
794 | return SR_ERR_BUG; | |
795 | /* At 125 MHz, the clock divider is bypassed. */ | |
796 | acq->bypass_clockdiv = (devc->samplerate > SR_MHZ(100)); | |
797 | ||
798 | /* If only one of the limits is set, derive the other one. */ | |
799 | if (devc->limit_msec == 0 && devc->limit_samples > 0) | |
800 | acq->duration_max = devc->limit_samples | |
801 | * 1000 / devc->samplerate + 1; | |
802 | else if (devc->limit_samples == 0 && devc->limit_msec > 0) | |
803 | acq->samples_max = devc->limit_msec | |
804 | * devc->samplerate / 1000; | |
805 | } else { | |
806 | acq->bypass_clockdiv = TRUE; | |
807 | ||
808 | if (devc->cfg_clock_edge == EDGE_NEGATIVE) | |
809 | sr_info("External clock, falling edge."); | |
810 | else | |
811 | sr_info("External clock, rising edge."); | |
812 | } | |
813 | ||
814 | regvals[0].reg = REG_MEM_CTRL; | |
815 | regvals[0].val = MEM_CTRL_CLR_IDX; | |
816 | ||
817 | regvals[1].reg = REG_MEM_CTRL; | |
818 | regvals[1].val = MEM_CTRL_WRITE; | |
819 | ||
820 | regvals[2].reg = REG_LONG_ADDR; | |
821 | regvals[2].val = LREG_CAP_CTRL; | |
822 | ||
823 | regvals[3].reg = REG_LONG_LOW; | |
824 | regvals[3].val = CAP_CTRL_CLR_TIMEBASE | CAP_CTRL_FLUSH_FIFO | |
825 | | CAP_CTRL_CLR_FIFOFULL | CAP_CTRL_CLR_COUNTER; | |
826 | regvals[4].reg = REG_LONG_HIGH; | |
827 | regvals[4].val = 0; | |
828 | ||
829 | regvals[5].reg = REG_LONG_STROBE; | |
830 | regvals[5].val = 0; | |
831 | ||
832 | regvals[6].reg = REG_DIV_BYPASS; | |
833 | regvals[6].val = acq->bypass_clockdiv; | |
834 | ||
835 | ret = lwla_write_regs(usb, regvals, ARRAY_SIZE(regvals)); | |
836 | if (ret != SR_OK) | |
837 | return ret; | |
838 | ||
839 | return capture_setup(sdi); | |
840 | } | |
841 | ||
842 | /* Start the capture operation on the LWLA device. Beginning with this | |
843 | * function, all USB transfers will be asynchronous until the end of the | |
844 | * acquisition session. | |
845 | */ | |
846 | SR_PRIV int lwla_start_acquisition(const struct sr_dev_inst *sdi) | |
847 | { | |
848 | struct dev_context *devc; | |
849 | struct sr_usb_dev_inst *usb; | |
850 | struct acquisition_state *acq; | |
851 | struct regval_pair *regvals; | |
852 | ||
853 | devc = sdi->priv; | |
854 | usb = sdi->conn; | |
855 | acq = devc->acquisition; | |
856 | ||
857 | acq->duration_now = 0; | |
858 | acq->mem_addr_fill = 0; | |
859 | acq->capture_flags = 0; | |
860 | ||
861 | libusb_fill_bulk_transfer(acq->xfer_out, usb->devhdl, EP_COMMAND, | |
862 | (unsigned char *)acq->xfer_buf_out, 0, | |
863 | &receive_transfer_out, | |
864 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); | |
865 | ||
866 | libusb_fill_bulk_transfer(acq->xfer_in, usb->devhdl, EP_REPLY, | |
867 | (unsigned char *)acq->xfer_buf_in, | |
868 | sizeof acq->xfer_buf_in, | |
869 | &receive_transfer_in, | |
870 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); | |
871 | ||
872 | regvals = devc->reg_write_seq; | |
873 | ||
874 | regvals[0].reg = REG_LONG_ADDR; | |
875 | regvals[0].val = LREG_CAP_CTRL; | |
876 | ||
877 | regvals[1].reg = REG_LONG_LOW; | |
878 | regvals[1].val = CAP_CTRL_TRG_EN; | |
879 | ||
880 | regvals[2].reg = REG_LONG_HIGH; | |
881 | regvals[2].val = 0; | |
882 | ||
883 | regvals[3].reg = REG_LONG_STROBE; | |
884 | regvals[3].val = 0; | |
885 | ||
886 | devc->reg_write_pos = 0; | |
887 | devc->reg_write_len = 4; | |
888 | ||
889 | devc->state = STATE_START_CAPTURE; | |
890 | ||
891 | return issue_next_write_reg(sdi); | |
892 | } | |
893 | ||
894 | /* Allocate an acquisition state object. | |
895 | */ | |
896 | SR_PRIV struct acquisition_state *lwla_alloc_acquisition_state(void) | |
897 | { | |
898 | struct acquisition_state *acq; | |
899 | ||
900 | acq = g_malloc0(sizeof(struct acquisition_state)); | |
901 | ||
902 | acq->xfer_in = libusb_alloc_transfer(0); | |
903 | if (!acq->xfer_in) { | |
904 | sr_err("Transfer malloc failed."); | |
905 | g_free(acq); | |
906 | return NULL; | |
907 | } | |
908 | ||
909 | acq->xfer_out = libusb_alloc_transfer(0); | |
910 | if (!acq->xfer_out) { | |
911 | sr_err("Transfer malloc failed."); | |
912 | libusb_free_transfer(acq->xfer_in); | |
913 | g_free(acq); | |
914 | return NULL; | |
915 | } | |
916 | ||
917 | return acq; | |
918 | } | |
919 | ||
920 | /* Deallocate an acquisition state object. | |
921 | */ | |
922 | SR_PRIV void lwla_free_acquisition_state(struct acquisition_state *acq) | |
923 | { | |
924 | if (acq) { | |
925 | libusb_free_transfer(acq->xfer_out); | |
926 | libusb_free_transfer(acq->xfer_in); | |
927 | g_free(acq); | |
928 | } | |
929 | } | |
930 | ||
931 | /* USB I/O source callback. | |
932 | */ | |
933 | SR_PRIV int lwla_receive_data(int fd, int revents, void *cb_data) | |
934 | { | |
935 | struct sr_dev_inst *sdi; | |
936 | struct dev_context *devc; | |
937 | struct drv_context *drvc; | |
938 | struct timeval tv; | |
939 | int ret; | |
940 | ||
941 | (void)fd; | |
942 | ||
943 | sdi = cb_data; | |
944 | devc = sdi->priv; | |
945 | drvc = sdi->driver->context; | |
946 | ||
947 | if (!devc || !drvc) | |
948 | return FALSE; | |
949 | ||
950 | /* No timeout: return immediately. */ | |
951 | tv.tv_sec = 0; | |
952 | tv.tv_usec = 0; | |
953 | ||
954 | ret = libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, | |
955 | &tv, NULL); | |
956 | if (ret != 0) | |
957 | sr_err("Event handling failed: %s.", libusb_error_name(ret)); | |
958 | ||
959 | /* If no event flags are set the timeout must have expired. */ | |
960 | if (revents == 0 && devc->state == STATE_STATUS_WAIT) { | |
961 | if (devc->cancel_requested) | |
962 | issue_stop_capture(sdi); | |
963 | else | |
964 | request_capture_status(sdi); | |
965 | } | |
966 | ||
967 | /* Check if an error occurred on a transfer. */ | |
968 | if (devc->transfer_error) | |
969 | end_acquisition(sdi); | |
970 | ||
971 | return TRUE; | |
972 | } |