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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 <string.h> | |
21 | #include "protocol.h" | |
22 | ||
23 | /* Bit mask for the RLE repeat-count-follows flag. */ | |
24 | #define RLE_FLAG_LEN_FOLLOWS ((uint64_t)1 << 35) | |
25 | ||
26 | /* Start address of capture status memory area to read. */ | |
27 | #define CAP_STAT_ADDR 5 | |
28 | ||
29 | /* Number of 64-bit words read from the capture status memory. */ | |
30 | #define CAP_STAT_LEN 5 | |
31 | ||
32 | /* The bitstream filenames are indexed by the clock_config enumeration. | |
33 | */ | |
34 | static const char bitstream_map[][32] = { | |
35 | "sysclk-lwla1034-off.rbf", | |
36 | "sysclk-lwla1034-int.rbf", | |
37 | "sysclk-lwla1034-extpos.rbf", | |
38 | "sysclk-lwla1034-extneg.rbf", | |
39 | }; | |
40 | ||
41 | /* Submit an already filled-in USB transfer. | |
42 | */ | |
43 | static int submit_transfer(struct dev_context *devc, | |
44 | struct libusb_transfer *xfer) | |
45 | { | |
46 | int ret; | |
47 | ||
48 | ret = libusb_submit_transfer(xfer); | |
49 | ||
50 | if (ret != 0) { | |
51 | sr_err("Submit transfer failed: %s.", libusb_error_name(ret)); | |
52 | devc->transfer_error = TRUE; | |
53 | return SR_ERR; | |
54 | } | |
55 | ||
56 | return SR_OK; | |
57 | } | |
58 | ||
59 | /* Set up the LWLA in preparation for an acquisition session. | |
60 | */ | |
61 | static int capture_setup(const struct sr_dev_inst *sdi) | |
62 | { | |
63 | struct dev_context *devc; | |
64 | struct acquisition_state *acq; | |
65 | uint64_t divider_count; | |
66 | uint64_t trigger_mask; | |
67 | uint64_t memory_limit; | |
68 | uint16_t command[3 + (10 * 4)]; | |
69 | ||
70 | devc = sdi->priv; | |
71 | acq = devc->acquisition; | |
72 | ||
73 | command[0] = LWLA_WORD(CMD_CAP_SETUP); | |
74 | command[1] = LWLA_WORD(0); /* address */ | |
75 | command[2] = LWLA_WORD(10); /* length */ | |
76 | ||
77 | command[3] = LWLA_WORD_0(devc->channel_mask); | |
78 | command[4] = LWLA_WORD_1(devc->channel_mask); | |
79 | command[5] = LWLA_WORD_2(devc->channel_mask); | |
80 | command[6] = LWLA_WORD_3(devc->channel_mask); | |
81 | ||
82 | /* Set the clock divide counter maximum for samplerates of up to | |
83 | * 100 MHz. At the highest samplerate of 125 MHz the clock divider | |
84 | * is bypassed. | |
85 | */ | |
86 | if (!acq->bypass_clockdiv && devc->samplerate > 0) | |
87 | divider_count = SR_MHZ(100) / devc->samplerate - 1; | |
88 | else | |
89 | divider_count = 0; | |
90 | ||
91 | command[7] = LWLA_WORD_0(divider_count); | |
92 | command[8] = LWLA_WORD_1(divider_count); | |
93 | command[9] = LWLA_WORD_2(divider_count); | |
94 | command[10] = LWLA_WORD_3(divider_count); | |
95 | ||
96 | command[11] = LWLA_WORD_0(devc->trigger_values); | |
97 | command[12] = LWLA_WORD_1(devc->trigger_values); | |
98 | command[13] = LWLA_WORD_2(devc->trigger_values); | |
99 | command[14] = LWLA_WORD_3(devc->trigger_values); | |
100 | ||
101 | command[15] = LWLA_WORD_0(devc->trigger_edge_mask); | |
102 | command[16] = LWLA_WORD_1(devc->trigger_edge_mask); | |
103 | command[17] = LWLA_WORD_2(devc->trigger_edge_mask); | |
104 | command[18] = LWLA_WORD_3(devc->trigger_edge_mask); | |
105 | ||
106 | trigger_mask = devc->trigger_mask; | |
107 | /* Set bits to select external TRG input edge. */ | |
108 | if (devc->cfg_trigger_source == TRIGGER_EXT_TRG) | |
109 | switch (devc->cfg_trigger_slope) { | |
110 | case EDGE_POSITIVE: | |
111 | trigger_mask |= (uint64_t)1 << 35; | |
112 | break; | |
113 | case EDGE_NEGATIVE: | |
114 | trigger_mask |= (uint64_t)1 << 34; | |
115 | break; | |
116 | } | |
117 | ||
118 | command[19] = LWLA_WORD_0(trigger_mask); | |
119 | command[20] = LWLA_WORD_1(trigger_mask); | |
120 | command[21] = LWLA_WORD_2(trigger_mask); | |
121 | command[22] = LWLA_WORD_3(trigger_mask); | |
122 | ||
123 | /* Set the capture memory full threshold. This is slightly less | |
124 | * than the actual maximum, most likely in order to compensate for | |
125 | * pipeline latency. | |
126 | */ | |
127 | memory_limit = MEMORY_DEPTH - 16; | |
128 | ||
129 | command[23] = LWLA_WORD_0(memory_limit); | |
130 | command[24] = LWLA_WORD_1(memory_limit); | |
131 | command[25] = LWLA_WORD_2(memory_limit); | |
132 | command[26] = LWLA_WORD_3(memory_limit); | |
133 | ||
134 | /* Fill remaining 64-bit words with zeroes. */ | |
135 | memset(&command[27], 0, 16 * sizeof(uint16_t)); | |
136 | ||
137 | return lwla_send_command(sdi->conn, command, ARRAY_SIZE(command)); | |
138 | } | |
139 | ||
140 | /* Issue a register write command as an asynchronous USB transfer. | |
141 | */ | |
142 | static int issue_write_reg(const struct sr_dev_inst *sdi, | |
143 | unsigned int reg, unsigned int value) | |
144 | { | |
145 | struct dev_context *devc; | |
146 | struct acquisition_state *acq; | |
147 | ||
148 | devc = sdi->priv; | |
149 | acq = devc->acquisition; | |
150 | ||
151 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_WRITE_REG); | |
152 | acq->xfer_buf_out[1] = LWLA_WORD(reg); | |
153 | acq->xfer_buf_out[2] = LWLA_WORD_0(value); | |
154 | acq->xfer_buf_out[3] = LWLA_WORD_1(value); | |
155 | ||
156 | acq->xfer_out->length = 4 * sizeof(uint16_t); | |
157 | ||
158 | return submit_transfer(devc, acq->xfer_out); | |
159 | } | |
160 | ||
161 | /* Issue a register write command as an asynchronous USB transfer for the | |
162 | * next register/value pair of the currently active register write sequence. | |
163 | */ | |
164 | static int issue_next_write_reg(const struct sr_dev_inst *sdi) | |
165 | { | |
166 | struct dev_context *devc; | |
167 | struct regval_pair *regval; | |
168 | int ret; | |
169 | ||
170 | devc = sdi->priv; | |
171 | ||
172 | if (devc->reg_write_pos >= devc->reg_write_len) { | |
173 | sr_err("Already written all registers in sequence."); | |
174 | return SR_ERR_BUG; | |
175 | } | |
176 | regval = &devc->reg_write_seq[devc->reg_write_pos]; | |
177 | ||
178 | ret = issue_write_reg(sdi, regval->reg, regval->val); | |
179 | if (ret != SR_OK) | |
180 | return ret; | |
181 | ||
182 | ++devc->reg_write_pos; | |
183 | return SR_OK; | |
184 | } | |
185 | ||
186 | /* Issue a capture status request as an asynchronous USB transfer. | |
187 | */ | |
188 | static void request_capture_status(const struct sr_dev_inst *sdi) | |
189 | { | |
190 | struct dev_context *devc; | |
191 | struct acquisition_state *acq; | |
192 | ||
193 | devc = sdi->priv; | |
194 | acq = devc->acquisition; | |
195 | ||
196 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_CAP_STATUS); | |
197 | acq->xfer_buf_out[1] = LWLA_WORD(CAP_STAT_ADDR); | |
198 | acq->xfer_buf_out[2] = LWLA_WORD(CAP_STAT_LEN); | |
199 | ||
200 | acq->xfer_out->length = 3 * sizeof(uint16_t); | |
201 | ||
202 | if (submit_transfer(devc, acq->xfer_out) == SR_OK) | |
203 | devc->state = STATE_STATUS_REQUEST; | |
204 | } | |
205 | ||
206 | /* Issue a request for the capture buffer fill level as | |
207 | * an asynchronous USB transfer. | |
208 | */ | |
209 | static void request_capture_length(const struct sr_dev_inst *sdi) | |
210 | { | |
211 | struct dev_context *devc; | |
212 | struct acquisition_state *acq; | |
213 | ||
214 | devc = sdi->priv; | |
215 | acq = devc->acquisition; | |
216 | ||
217 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_REG); | |
218 | acq->xfer_buf_out[1] = LWLA_WORD(REG_MEM_FILL); | |
219 | ||
220 | acq->xfer_out->length = 2 * sizeof(uint16_t); | |
221 | ||
222 | if (submit_transfer(devc, acq->xfer_out) == SR_OK) | |
223 | devc->state = STATE_LENGTH_REQUEST; | |
224 | } | |
225 | ||
226 | /* Initiate the capture memory read operation: Reset the acquisition state | |
227 | * and start a sequence of register writes in order to set up the device for | |
228 | * reading from the capture buffer. | |
229 | */ | |
230 | static void issue_read_start(const struct sr_dev_inst *sdi) | |
231 | { | |
232 | struct dev_context *devc; | |
233 | struct acquisition_state *acq; | |
234 | struct regval_pair *regvals; | |
235 | ||
236 | devc = sdi->priv; | |
237 | acq = devc->acquisition; | |
238 | ||
239 | /* Reset RLE state. */ | |
240 | acq->rle = RLE_STATE_DATA; | |
241 | acq->sample = 0; | |
242 | acq->run_len = 0; | |
243 | ||
244 | acq->samples_done = 0; | |
245 | ||
246 | /* For some reason, the start address is 4 rather than 0. */ | |
247 | acq->mem_addr_done = 4; | |
248 | acq->mem_addr_next = 4; | |
249 | acq->mem_addr_stop = acq->mem_addr_fill; | |
250 | ||
251 | /* Sample position in the packet output buffer. */ | |
252 | acq->out_index = 0; | |
253 | ||
254 | regvals = devc->reg_write_seq; | |
255 | ||
256 | regvals[0].reg = REG_DIV_BYPASS; | |
257 | regvals[0].val = 1; | |
258 | ||
259 | regvals[1].reg = REG_MEM_CTRL2; | |
260 | regvals[1].val = 2; | |
261 | ||
262 | regvals[2].reg = REG_MEM_CTRL4; | |
263 | regvals[2].val = 4; | |
264 | ||
265 | devc->reg_write_pos = 0; | |
266 | devc->reg_write_len = 3; | |
267 | ||
268 | if (issue_next_write_reg(sdi) == SR_OK) | |
269 | devc->state = STATE_READ_PREPARE; | |
270 | } | |
271 | ||
272 | /* Issue a command as an asynchronous USB transfer which returns the device | |
273 | * to normal state after a read operation. Sets a new device context state | |
274 | * on success. | |
275 | */ | |
276 | static void issue_read_end(const struct sr_dev_inst *sdi) | |
277 | { | |
278 | struct dev_context *devc; | |
279 | ||
280 | devc = sdi->priv; | |
281 | ||
282 | if (issue_write_reg(sdi, REG_DIV_BYPASS, 0) == SR_OK) | |
283 | devc->state = STATE_READ_END; | |
284 | } | |
285 | ||
286 | /* Decode an incoming response to a buffer fill level request and act on it | |
287 | * as appropriate. Note that this function changes the device context state. | |
288 | */ | |
289 | static void process_capture_length(const struct sr_dev_inst *sdi) | |
290 | { | |
291 | struct dev_context *devc; | |
292 | struct acquisition_state *acq; | |
293 | ||
294 | devc = sdi->priv; | |
295 | acq = devc->acquisition; | |
296 | ||
297 | if (acq->xfer_in->actual_length != 4) { | |
298 | sr_err("Received size %d doesn't match expected size 4.", | |
299 | acq->xfer_in->actual_length); | |
300 | devc->transfer_error = TRUE; | |
301 | return; | |
302 | } | |
303 | acq->mem_addr_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]); | |
304 | ||
305 | sr_dbg("%zu words in capture buffer.", acq->mem_addr_fill); | |
306 | ||
307 | if (acq->mem_addr_fill > 0 && sdi->status == SR_ST_ACTIVE) | |
308 | issue_read_start(sdi); | |
309 | else | |
310 | issue_read_end(sdi); | |
311 | } | |
312 | ||
313 | /* Initiate a sequence of register write commands with the effect of | |
314 | * cancelling a running capture operation. This sets a new device state | |
315 | * if issuing the first command succeeds. | |
316 | */ | |
317 | static void issue_stop_capture(const struct sr_dev_inst *sdi) | |
318 | { | |
319 | struct dev_context *devc; | |
320 | struct regval_pair *regvals; | |
321 | ||
322 | devc = sdi->priv; | |
323 | ||
324 | if (devc->stopping_in_progress) | |
325 | return; | |
326 | ||
327 | regvals = devc->reg_write_seq; | |
328 | ||
329 | regvals[0].reg = REG_CMD_CTRL2; | |
330 | regvals[0].val = 10; | |
331 | ||
332 | regvals[1].reg = REG_CMD_CTRL3; | |
333 | regvals[1].val = 0; | |
334 | ||
335 | regvals[2].reg = REG_CMD_CTRL4; | |
336 | regvals[2].val = 0; | |
337 | ||
338 | regvals[3].reg = REG_CMD_CTRL1; | |
339 | regvals[3].val = 0; | |
340 | ||
341 | regvals[4].reg = REG_DIV_BYPASS; | |
342 | regvals[4].val = 0; | |
343 | ||
344 | devc->reg_write_pos = 0; | |
345 | devc->reg_write_len = 5; | |
346 | ||
347 | if (issue_next_write_reg(sdi) == SR_OK) { | |
348 | devc->stopping_in_progress = TRUE; | |
349 | devc->state = STATE_STOP_CAPTURE; | |
350 | } | |
351 | } | |
352 | ||
353 | /* Decode an incoming capture status response and act on it as appropriate. | |
354 | * Note that this function changes the device state. | |
355 | */ | |
356 | static void process_capture_status(const struct sr_dev_inst *sdi) | |
357 | { | |
358 | uint64_t duration; | |
359 | struct dev_context *devc; | |
360 | struct acquisition_state *acq; | |
361 | unsigned int mem_fill; | |
362 | unsigned int flags; | |
363 | ||
364 | devc = sdi->priv; | |
365 | acq = devc->acquisition; | |
366 | ||
367 | if (acq->xfer_in->actual_length != CAP_STAT_LEN * 8) { | |
368 | sr_err("Received size %d doesn't match expected size %d.", | |
369 | acq->xfer_in->actual_length, CAP_STAT_LEN * 8); | |
370 | devc->transfer_error = TRUE; | |
371 | return; | |
372 | } | |
373 | ||
374 | /* TODO: Find out the actual bit width of these fields as stored | |
375 | * in the FPGA. These fields are definitely less than 64 bit wide | |
376 | * internally, and the unused bits occasionally even contain garbage. | |
377 | */ | |
378 | mem_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]); | |
379 | duration = LWLA_TO_UINT32(acq->xfer_buf_in[4]); | |
380 | flags = LWLA_TO_UINT32(acq->xfer_buf_in[8]) & STATUS_FLAG_MASK; | |
381 | ||
382 | /* The LWLA1034 runs at 125 MHz if the clock divider is bypassed. | |
383 | * However, the time base used for the duration is apparently not | |
384 | * adjusted for this "boost" mode. Whereas normally the duration | |
385 | * unit is 1 ms, it is 0.8 ms when the clock divider is bypassed. | |
386 | * As 0.8 = 100 MHz / 125 MHz, it seems that the internal cycle | |
387 | * counter period is the same as at the 100 MHz setting. | |
388 | */ | |
389 | if (acq->bypass_clockdiv) | |
390 | acq->duration_now = duration * 4 / 5; | |
391 | else | |
392 | acq->duration_now = duration; | |
393 | ||
394 | sr_spew("Captured %u words, %" PRIu64 " ms, flags 0x%02X.", | |
395 | mem_fill, acq->duration_now, flags); | |
396 | ||
397 | if ((flags & STATUS_TRIGGERED) > (acq->capture_flags & STATUS_TRIGGERED)) | |
398 | sr_info("Capture triggered."); | |
399 | ||
400 | acq->capture_flags = flags; | |
401 | ||
402 | if (acq->duration_now >= acq->duration_max) { | |
403 | sr_dbg("Time limit reached, stopping capture."); | |
404 | issue_stop_capture(sdi); | |
405 | return; | |
406 | } | |
407 | devc->state = STATE_STATUS_WAIT; | |
408 | ||
409 | if ((acq->capture_flags & STATUS_TRIGGERED) == 0) { | |
410 | sr_spew("Waiting for trigger."); | |
411 | } else if ((acq->capture_flags & STATUS_MEM_AVAIL) == 0) { | |
412 | sr_dbg("Capture memory filled."); | |
413 | request_capture_length(sdi); | |
414 | } else if ((acq->capture_flags & STATUS_CAPTURING) != 0) { | |
415 | sr_spew("Sampling in progress."); | |
416 | } | |
417 | } | |
418 | ||
419 | /* Issue a capture buffer read request as an asynchronous USB transfer. | |
420 | * The address and size of the memory area to read are derived from the | |
421 | * current acquisition state. | |
422 | */ | |
423 | static void request_read_mem(const struct sr_dev_inst *sdi) | |
424 | { | |
425 | struct dev_context *devc; | |
426 | struct acquisition_state *acq; | |
427 | size_t count; | |
428 | ||
429 | devc = sdi->priv; | |
430 | acq = devc->acquisition; | |
431 | ||
432 | if (acq->mem_addr_next >= acq->mem_addr_stop) | |
433 | return; | |
434 | ||
435 | /* Always read a multiple of 8 device words. */ | |
436 | count = (acq->mem_addr_stop - acq->mem_addr_next + 7) / 8 * 8; | |
437 | count = MIN(count, READ_CHUNK_LEN); | |
438 | ||
439 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_MEM); | |
440 | acq->xfer_buf_out[1] = LWLA_WORD_0(acq->mem_addr_next); | |
441 | acq->xfer_buf_out[2] = LWLA_WORD_1(acq->mem_addr_next); | |
442 | acq->xfer_buf_out[3] = LWLA_WORD_0(count); | |
443 | acq->xfer_buf_out[4] = LWLA_WORD_1(count); | |
444 | ||
445 | acq->xfer_out->length = 5 * sizeof(uint16_t); | |
446 | ||
447 | if (submit_transfer(devc, acq->xfer_out) == SR_OK) { | |
448 | acq->mem_addr_next += count; | |
449 | devc->state = STATE_READ_REQUEST; | |
450 | } | |
451 | } | |
452 | ||
453 | /* Demangle and decompress incoming sample data from the capture buffer. | |
454 | * The data chunk is taken from the acquisition state, and is expected to | |
455 | * contain a multiple of 8 device words. | |
456 | * All data currently in the acquisition buffer will be processed. Packets | |
457 | * of decoded samples are sent off to the session bus whenever the output | |
458 | * buffer becomes full while decoding. | |
459 | */ | |
460 | static int process_sample_data(const struct sr_dev_inst *sdi) | |
461 | { | |
462 | uint64_t sample; | |
463 | uint64_t high_nibbles; | |
464 | uint64_t word; | |
465 | struct dev_context *devc; | |
466 | struct acquisition_state *acq; | |
467 | uint8_t *out_p; | |
468 | uint32_t *slice; | |
469 | struct sr_datafeed_packet packet; | |
470 | struct sr_datafeed_logic logic; | |
471 | size_t expect_len; | |
472 | size_t actual_len; | |
473 | size_t out_max_samples; | |
474 | size_t out_run_samples; | |
475 | size_t ri; | |
476 | size_t in_words_left; | |
477 | size_t si; | |
478 | ||
479 | devc = sdi->priv; | |
480 | acq = devc->acquisition; | |
481 | ||
482 | if (acq->mem_addr_done >= acq->mem_addr_stop | |
483 | || acq->samples_done >= acq->samples_max) | |
484 | return SR_OK; | |
485 | ||
486 | in_words_left = MIN(acq->mem_addr_stop - acq->mem_addr_done, | |
487 | READ_CHUNK_LEN); | |
488 | expect_len = LWLA1034_MEMBUF_LEN(in_words_left) * sizeof(uint32_t); | |
489 | actual_len = acq->xfer_in->actual_length; | |
490 | ||
491 | if (actual_len != expect_len) { | |
492 | sr_err("Received size %zu does not match expected size %zu.", | |
493 | actual_len, expect_len); | |
494 | devc->transfer_error = TRUE; | |
495 | return SR_ERR; | |
496 | } | |
497 | acq->mem_addr_done += in_words_left; | |
498 | ||
499 | /* Prepare session packet. */ | |
500 | packet.type = SR_DF_LOGIC; | |
501 | packet.payload = &logic; | |
502 | logic.unitsize = UNIT_SIZE; | |
503 | logic.data = acq->out_packet; | |
504 | ||
505 | slice = acq->xfer_buf_in; | |
506 | si = 0; /* word index within slice */ | |
507 | ||
508 | for (;;) { | |
509 | /* Calculate number of samples to write into packet. */ | |
510 | out_max_samples = MIN(acq->samples_max - acq->samples_done, | |
511 | PACKET_LENGTH - acq->out_index); | |
512 | out_run_samples = MIN(acq->run_len, out_max_samples); | |
513 | ||
514 | /* Expand run-length samples into session packet. */ | |
515 | sample = acq->sample; | |
516 | out_p = &acq->out_packet[acq->out_index * UNIT_SIZE]; | |
517 | ||
518 | for (ri = 0; ri < out_run_samples; ++ri) { | |
519 | out_p[0] = sample & 0xFF; | |
520 | out_p[1] = (sample >> 8) & 0xFF; | |
521 | out_p[2] = (sample >> 16) & 0xFF; | |
522 | out_p[3] = (sample >> 24) & 0xFF; | |
523 | out_p[4] = (sample >> 32) & 0xFF; | |
524 | out_p += UNIT_SIZE; | |
525 | } | |
526 | acq->run_len -= out_run_samples; | |
527 | acq->out_index += out_run_samples; | |
528 | acq->samples_done += out_run_samples; | |
529 | ||
530 | /* Packet full or sample count limit reached? */ | |
531 | if (out_run_samples == out_max_samples) { | |
532 | logic.length = acq->out_index * UNIT_SIZE; | |
533 | sr_session_send(sdi, &packet); | |
534 | acq->out_index = 0; | |
535 | ||
536 | if (acq->samples_done >= acq->samples_max) | |
537 | return SR_OK; /* sample limit reached */ | |
538 | if (acq->run_len > 0) | |
539 | continue; /* need another packet */ | |
540 | } | |
541 | ||
542 | if (in_words_left == 0) | |
543 | break; /* done with current chunk */ | |
544 | ||
545 | /* Now work on the current slice. */ | |
546 | high_nibbles = LWLA_TO_UINT32(slice[8]); | |
547 | word = LWLA_TO_UINT32(slice[si]); | |
548 | word |= (high_nibbles << (4 * si + 4)) & ((uint64_t)0xF << 32); | |
549 | ||
550 | if (acq->rle == RLE_STATE_DATA) { | |
551 | acq->sample = word & ALL_CHANNELS_MASK; | |
552 | acq->run_len = ((word >> NUM_CHANNELS) & 1) + 1; | |
553 | if (word & RLE_FLAG_LEN_FOLLOWS) | |
554 | acq->rle = RLE_STATE_LEN; | |
555 | } else { | |
556 | acq->run_len += word << 1; | |
557 | acq->rle = RLE_STATE_DATA; | |
558 | } | |
559 | ||
560 | /* Move to next word. */ | |
561 | si = (si + 1) % 8; | |
562 | if (si == 0) | |
563 | slice += 9; | |
564 | --in_words_left; | |
565 | } | |
566 | ||
567 | /* Send out partially filled packet if this was the last chunk. */ | |
568 | if (acq->mem_addr_done >= acq->mem_addr_stop && acq->out_index > 0) { | |
569 | logic.length = acq->out_index * UNIT_SIZE; | |
570 | sr_session_send(sdi, &packet); | |
571 | acq->out_index = 0; | |
572 | } | |
573 | return SR_OK; | |
574 | } | |
575 | ||
576 | /* Finish an acquisition session. This sends the end packet to the session | |
577 | * bus and removes the listener for asynchronous USB transfers. | |
578 | */ | |
579 | static void end_acquisition(struct sr_dev_inst *sdi) | |
580 | { | |
581 | struct drv_context *drvc; | |
582 | struct dev_context *devc; | |
583 | struct sr_datafeed_packet packet; | |
584 | ||
585 | drvc = sdi->driver->priv; | |
586 | devc = sdi->priv; | |
587 | ||
588 | if (devc->state == STATE_IDLE) | |
589 | return; | |
590 | ||
591 | devc->state = STATE_IDLE; | |
592 | ||
593 | /* Remove USB file descriptors from polling. */ | |
594 | usb_source_remove(sdi->session, drvc->sr_ctx); | |
595 | ||
596 | packet.type = SR_DF_END; | |
597 | sr_session_send(sdi, &packet); | |
598 | ||
599 | lwla_free_acquisition_state(devc->acquisition); | |
600 | devc->acquisition = NULL; | |
601 | ||
602 | sdi->status = SR_ST_ACTIVE; | |
603 | } | |
604 | ||
605 | /* USB output transfer completion callback. | |
606 | */ | |
607 | static void LIBUSB_CALL receive_transfer_out(struct libusb_transfer *transfer) | |
608 | { | |
609 | struct sr_dev_inst *sdi; | |
610 | struct dev_context *devc; | |
611 | ||
612 | sdi = transfer->user_data; | |
613 | devc = sdi->priv; | |
614 | ||
615 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) { | |
616 | sr_err("Transfer to device failed: %d.", transfer->status); | |
617 | devc->transfer_error = TRUE; | |
618 | return; | |
619 | } | |
620 | ||
621 | if (devc->reg_write_pos < devc->reg_write_len) { | |
622 | issue_next_write_reg(sdi); | |
623 | } else { | |
624 | switch (devc->state) { | |
625 | case STATE_START_CAPTURE: | |
626 | devc->state = STATE_STATUS_WAIT; | |
627 | break; | |
628 | case STATE_STATUS_REQUEST: | |
629 | devc->state = STATE_STATUS_RESPONSE; | |
630 | submit_transfer(devc, devc->acquisition->xfer_in); | |
631 | break; | |
632 | case STATE_STOP_CAPTURE: | |
633 | if (sdi->status == SR_ST_ACTIVE) | |
634 | request_capture_length(sdi); | |
635 | else | |
636 | end_acquisition(sdi); | |
637 | break; | |
638 | case STATE_LENGTH_REQUEST: | |
639 | devc->state = STATE_LENGTH_RESPONSE; | |
640 | submit_transfer(devc, devc->acquisition->xfer_in); | |
641 | break; | |
642 | case STATE_READ_PREPARE: | |
643 | request_read_mem(sdi); | |
644 | break; | |
645 | case STATE_READ_REQUEST: | |
646 | devc->state = STATE_READ_RESPONSE; | |
647 | submit_transfer(devc, devc->acquisition->xfer_in); | |
648 | break; | |
649 | case STATE_READ_END: | |
650 | end_acquisition(sdi); | |
651 | break; | |
652 | default: | |
653 | sr_err("Unexpected device state %d.", devc->state); | |
654 | break; | |
655 | } | |
656 | } | |
657 | } | |
658 | ||
659 | /* USB input transfer completion callback. | |
660 | */ | |
661 | static void LIBUSB_CALL receive_transfer_in(struct libusb_transfer *transfer) | |
662 | { | |
663 | struct sr_dev_inst *sdi; | |
664 | struct dev_context *devc; | |
665 | struct acquisition_state *acq; | |
666 | ||
667 | sdi = transfer->user_data; | |
668 | devc = sdi->priv; | |
669 | acq = devc->acquisition; | |
670 | ||
671 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) { | |
672 | sr_err("Transfer from device failed: %d.", transfer->status); | |
673 | devc->transfer_error = TRUE; | |
674 | return; | |
675 | } | |
676 | ||
677 | switch (devc->state) { | |
678 | case STATE_STATUS_RESPONSE: | |
679 | process_capture_status(sdi); | |
680 | break; | |
681 | case STATE_LENGTH_RESPONSE: | |
682 | process_capture_length(sdi); | |
683 | break; | |
684 | case STATE_READ_RESPONSE: | |
685 | if (process_sample_data(sdi) == SR_OK | |
686 | && acq->mem_addr_next < acq->mem_addr_stop | |
687 | && acq->samples_done < acq->samples_max) | |
688 | request_read_mem(sdi); | |
689 | else | |
690 | issue_read_end(sdi); | |
691 | break; | |
692 | default: | |
693 | sr_err("Unexpected device state %d.", devc->state); | |
694 | break; | |
695 | } | |
696 | } | |
697 | ||
698 | /* Initialize the LWLA. This downloads a bitstream into the FPGA | |
699 | * and executes a simple device test sequence. | |
700 | */ | |
701 | SR_PRIV int lwla_init_device(const struct sr_dev_inst *sdi) | |
702 | { | |
703 | struct dev_context *devc; | |
704 | int ret; | |
705 | uint32_t value; | |
706 | ||
707 | devc = sdi->priv; | |
708 | ||
709 | /* Force reload of bitstream */ | |
710 | devc->cur_clock_config = CONF_CLOCK_NONE; | |
711 | ||
712 | ret = lwla_set_clock_config(sdi); | |
713 | ||
714 | if (ret != SR_OK) | |
715 | return ret; | |
716 | ||
717 | ret = lwla_write_reg(sdi->conn, REG_CMD_CTRL2, 100); | |
718 | if (ret != SR_OK) | |
719 | return ret; | |
720 | ||
721 | ret = lwla_read_reg(sdi->conn, REG_CMD_CTRL1, &value); | |
722 | if (ret != SR_OK) | |
723 | return ret; | |
724 | sr_dbg("Received test word 0x%08X back.", value); | |
725 | if (value != 0x12345678) | |
726 | return SR_ERR; | |
727 | ||
728 | ret = lwla_read_reg(sdi->conn, REG_CMD_CTRL4, &value); | |
729 | if (ret != SR_OK) | |
730 | return ret; | |
731 | sr_dbg("Received test word 0x%08X back.", value); | |
732 | if (value != 0x12345678) | |
733 | return SR_ERR; | |
734 | ||
735 | ret = lwla_read_reg(sdi->conn, REG_CMD_CTRL3, &value); | |
736 | if (ret != SR_OK) | |
737 | return ret; | |
738 | sr_dbg("Received test word 0x%08X back.", value); | |
739 | if (value != 0x87654321) | |
740 | return SR_ERR; | |
741 | ||
742 | return ret; | |
743 | } | |
744 | ||
745 | SR_PRIV int lwla_convert_trigger(const struct sr_dev_inst *sdi) | |
746 | { | |
747 | struct dev_context *devc; | |
748 | struct sr_trigger *trigger; | |
749 | struct sr_trigger_stage *stage; | |
750 | struct sr_trigger_match *match; | |
751 | const GSList *l, *m; | |
752 | uint64_t channel_index; | |
753 | ||
754 | devc = sdi->priv; | |
755 | ||
756 | devc->trigger_mask = 0; | |
757 | devc->trigger_values = 0; | |
758 | devc->trigger_edge_mask = 0; | |
759 | ||
760 | if (!(trigger = sr_session_trigger_get(sdi->session))) | |
761 | return SR_OK; | |
762 | ||
763 | if (g_slist_length(trigger->stages) > 1) { | |
764 | sr_err("This device only supports 1 trigger stage."); | |
765 | return SR_ERR; | |
766 | } | |
767 | ||
768 | for (l = trigger->stages; l; l = l->next) { | |
769 | stage = l->data; | |
770 | for (m = stage->matches; m; m = m->next) { | |
771 | match = m->data; | |
772 | if (!match->channel->enabled) | |
773 | /* Ignore disabled channels with a trigger. */ | |
774 | continue; | |
775 | channel_index = (uint64_t)1 << match->channel->index; | |
776 | devc->trigger_mask |= channel_index; | |
777 | switch (match->match) { | |
778 | case SR_TRIGGER_ONE: | |
779 | devc->trigger_values |= channel_index; | |
780 | break; | |
781 | case SR_TRIGGER_RISING: | |
782 | devc->trigger_values |= channel_index; | |
783 | /* Fall through for edge mask. */ | |
784 | case SR_TRIGGER_FALLING: | |
785 | devc->trigger_edge_mask |= channel_index; | |
786 | break; | |
787 | } | |
788 | } | |
789 | } | |
790 | ||
791 | return SR_OK; | |
792 | } | |
793 | ||
794 | /* Select the LWLA clock configuration. If the clock source changed from | |
795 | * the previous setting, this will download a new bitstream to the FPGA. | |
796 | */ | |
797 | SR_PRIV int lwla_set_clock_config(const struct sr_dev_inst *sdi) | |
798 | { | |
799 | struct dev_context *devc; | |
800 | int ret; | |
801 | enum clock_config choice; | |
802 | ||
803 | devc = sdi->priv; | |
804 | ||
805 | if (sdi->status == SR_ST_INACTIVE) | |
806 | choice = CONF_CLOCK_NONE; | |
807 | else if (devc->cfg_clock_source == CLOCK_INTERNAL) | |
808 | choice = CONF_CLOCK_INT; | |
809 | else if (devc->cfg_clock_edge == EDGE_POSITIVE) | |
810 | choice = CONF_CLOCK_EXT_RISE; | |
811 | else | |
812 | choice = CONF_CLOCK_EXT_FALL; | |
813 | ||
814 | if (choice != devc->cur_clock_config) { | |
815 | devc->cur_clock_config = CONF_CLOCK_NONE; | |
816 | ret = lwla_send_bitstream(sdi->conn, bitstream_map[choice]); | |
817 | if (ret == SR_OK) | |
818 | devc->cur_clock_config = choice; | |
819 | return ret; | |
820 | } | |
821 | return SR_OK; | |
822 | } | |
823 | ||
824 | /* Configure the LWLA in preparation for an acquisition session. | |
825 | */ | |
826 | SR_PRIV int lwla_setup_acquisition(const struct sr_dev_inst *sdi) | |
827 | { | |
828 | struct dev_context *devc; | |
829 | struct sr_usb_dev_inst *usb; | |
830 | struct acquisition_state *acq; | |
831 | struct regval_pair regvals[7]; | |
832 | int ret; | |
833 | ||
834 | devc = sdi->priv; | |
835 | usb = sdi->conn; | |
836 | acq = devc->acquisition; | |
837 | ||
838 | if (devc->limit_msec > 0) { | |
839 | acq->duration_max = devc->limit_msec; | |
840 | sr_info("Acquisition time limit %" PRIu64 " ms.", | |
841 | devc->limit_msec); | |
842 | } else | |
843 | acq->duration_max = MAX_LIMIT_MSEC; | |
844 | ||
845 | if (devc->limit_samples > 0) { | |
846 | acq->samples_max = devc->limit_samples; | |
847 | sr_info("Acquisition sample count limit %" PRIu64 ".", | |
848 | devc->limit_samples); | |
849 | } else | |
850 | acq->samples_max = MAX_LIMIT_SAMPLES; | |
851 | ||
852 | if (devc->cfg_clock_source == CLOCK_INTERNAL) { | |
853 | sr_info("Internal clock, samplerate %" PRIu64 ".", | |
854 | devc->samplerate); | |
855 | if (devc->samplerate == 0) | |
856 | return SR_ERR_BUG; | |
857 | /* At 125 MHz, the clock divider is bypassed. */ | |
858 | acq->bypass_clockdiv = (devc->samplerate > SR_MHZ(100)); | |
859 | ||
860 | /* If only one of the limits is set, derive the other one. */ | |
861 | if (devc->limit_msec == 0 && devc->limit_samples > 0) | |
862 | acq->duration_max = devc->limit_samples | |
863 | * 1000 / devc->samplerate + 1; | |
864 | else if (devc->limit_samples == 0 && devc->limit_msec > 0) | |
865 | acq->samples_max = devc->limit_msec | |
866 | * devc->samplerate / 1000; | |
867 | } else { | |
868 | acq->bypass_clockdiv = TRUE; | |
869 | ||
870 | if (devc->cfg_clock_edge == EDGE_NEGATIVE) | |
871 | sr_info("External clock, falling edge."); | |
872 | else | |
873 | sr_info("External clock, rising edge."); | |
874 | } | |
875 | ||
876 | regvals[0].reg = REG_MEM_CTRL2; | |
877 | regvals[0].val = 2; | |
878 | ||
879 | regvals[1].reg = REG_MEM_CTRL2; | |
880 | regvals[1].val = 1; | |
881 | ||
882 | regvals[2].reg = REG_CMD_CTRL2; | |
883 | regvals[2].val = 10; | |
884 | ||
885 | regvals[3].reg = REG_CMD_CTRL3; | |
886 | regvals[3].val = 0x74; | |
887 | ||
888 | regvals[4].reg = REG_CMD_CTRL4; | |
889 | regvals[4].val = 0; | |
890 | ||
891 | regvals[5].reg = REG_CMD_CTRL1; | |
892 | regvals[5].val = 0; | |
893 | ||
894 | regvals[6].reg = REG_DIV_BYPASS; | |
895 | regvals[6].val = acq->bypass_clockdiv; | |
896 | ||
897 | ret = lwla_write_regs(usb, regvals, ARRAY_SIZE(regvals)); | |
898 | if (ret != SR_OK) | |
899 | return ret; | |
900 | ||
901 | return capture_setup(sdi); | |
902 | } | |
903 | ||
904 | /* Start the capture operation on the LWLA device. Beginning with this | |
905 | * function, all USB transfers will be asynchronous until the end of the | |
906 | * acquisition session. | |
907 | */ | |
908 | SR_PRIV int lwla_start_acquisition(const struct sr_dev_inst *sdi) | |
909 | { | |
910 | struct dev_context *devc; | |
911 | struct sr_usb_dev_inst *usb; | |
912 | struct acquisition_state *acq; | |
913 | struct regval_pair *regvals; | |
914 | ||
915 | devc = sdi->priv; | |
916 | usb = sdi->conn; | |
917 | acq = devc->acquisition; | |
918 | ||
919 | acq->duration_now = 0; | |
920 | acq->mem_addr_fill = 0; | |
921 | acq->capture_flags = 0; | |
922 | ||
923 | libusb_fill_bulk_transfer(acq->xfer_out, usb->devhdl, EP_COMMAND, | |
924 | (unsigned char *)acq->xfer_buf_out, 0, | |
925 | &receive_transfer_out, | |
926 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); | |
927 | ||
928 | libusb_fill_bulk_transfer(acq->xfer_in, usb->devhdl, EP_REPLY, | |
929 | (unsigned char *)acq->xfer_buf_in, | |
930 | sizeof acq->xfer_buf_in, | |
931 | &receive_transfer_in, | |
932 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); | |
933 | ||
934 | regvals = devc->reg_write_seq; | |
935 | ||
936 | regvals[0].reg = REG_CMD_CTRL2; | |
937 | regvals[0].val = 10; | |
938 | ||
939 | regvals[1].reg = REG_CMD_CTRL3; | |
940 | regvals[1].val = 1; | |
941 | ||
942 | regvals[2].reg = REG_CMD_CTRL4; | |
943 | regvals[2].val = 0; | |
944 | ||
945 | regvals[3].reg = REG_CMD_CTRL1; | |
946 | regvals[3].val = 0; | |
947 | ||
948 | devc->reg_write_pos = 0; | |
949 | devc->reg_write_len = 4; | |
950 | ||
951 | devc->state = STATE_START_CAPTURE; | |
952 | ||
953 | return issue_next_write_reg(sdi); | |
954 | } | |
955 | ||
956 | /* Allocate an acquisition state object. | |
957 | */ | |
958 | SR_PRIV struct acquisition_state *lwla_alloc_acquisition_state(void) | |
959 | { | |
960 | struct acquisition_state *acq; | |
961 | ||
962 | acq = g_malloc0(sizeof(struct acquisition_state)); | |
963 | ||
964 | acq->xfer_in = libusb_alloc_transfer(0); | |
965 | if (!acq->xfer_in) { | |
966 | sr_err("Transfer malloc failed."); | |
967 | g_free(acq); | |
968 | return NULL; | |
969 | } | |
970 | ||
971 | acq->xfer_out = libusb_alloc_transfer(0); | |
972 | if (!acq->xfer_out) { | |
973 | sr_err("Transfer malloc failed."); | |
974 | libusb_free_transfer(acq->xfer_in); | |
975 | g_free(acq); | |
976 | return NULL; | |
977 | } | |
978 | ||
979 | return acq; | |
980 | } | |
981 | ||
982 | /* Deallocate an acquisition state object. | |
983 | */ | |
984 | SR_PRIV void lwla_free_acquisition_state(struct acquisition_state *acq) | |
985 | { | |
986 | if (acq) { | |
987 | libusb_free_transfer(acq->xfer_out); | |
988 | libusb_free_transfer(acq->xfer_in); | |
989 | g_free(acq); | |
990 | } | |
991 | } | |
992 | ||
993 | /* USB I/O source callback. | |
994 | */ | |
995 | SR_PRIV int lwla_receive_data(int fd, int revents, void *cb_data) | |
996 | { | |
997 | struct sr_dev_inst *sdi; | |
998 | struct dev_context *devc; | |
999 | struct drv_context *drvc; | |
1000 | struct timeval tv; | |
1001 | int ret; | |
1002 | ||
1003 | (void)fd; | |
1004 | ||
1005 | sdi = cb_data; | |
1006 | devc = sdi->priv; | |
1007 | drvc = sdi->driver->priv; | |
1008 | ||
1009 | if (!devc || !drvc) | |
1010 | return FALSE; | |
1011 | ||
1012 | /* No timeout: return immediately. */ | |
1013 | tv.tv_sec = 0; | |
1014 | tv.tv_usec = 0; | |
1015 | ||
1016 | ret = libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, | |
1017 | &tv, NULL); | |
1018 | if (ret != 0) | |
1019 | sr_err("Event handling failed: %s.", libusb_error_name(ret)); | |
1020 | ||
1021 | /* If no event flags are set the timeout must have expired. */ | |
1022 | if (revents == 0 && devc->state == STATE_STATUS_WAIT) { | |
1023 | if (sdi->status == SR_ST_STOPPING) | |
1024 | issue_stop_capture(sdi); | |
1025 | else | |
1026 | request_capture_status(sdi); | |
1027 | } | |
1028 | ||
1029 | /* Check if an error occurred on a transfer. */ | |
1030 | if (devc->transfer_error) | |
1031 | end_acquisition(sdi); | |
1032 | ||
1033 | return TRUE; | |
1034 | } |