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aeaad0b0 DE |
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 | ||
6ec6c43b | 20 | #include <config.h> |
5874e88d | 21 | #include <string.h> |
515ab088 | 22 | #include "protocol.h" |
aeaad0b0 | 23 | |
5874e88d DE |
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 | ||
6358f0a9 | 33 | /* The bitstream filenames are indexed by the clock_config enumeration. |
5874e88d | 34 | */ |
c2066c21 DE |
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", | |
5874e88d DE |
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) | |
aeaad0b0 | 63 | { |
aeaad0b0 | 64 | struct dev_context *devc; |
29d58767 | 65 | struct acquisition_state *acq; |
5874e88d | 66 | uint64_t divider_count; |
e6e54bd2 | 67 | uint64_t trigger_mask; |
5874e88d | 68 | uint64_t memory_limit; |
1a46cc62 | 69 | uint16_t command[3 + (10 * 4)]; |
aeaad0b0 | 70 | |
5874e88d | 71 | devc = sdi->priv; |
29d58767 | 72 | acq = devc->acquisition; |
aeaad0b0 | 73 | |
5874e88d DE |
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 | */ | |
29d58767 | 87 | if (!acq->bypass_clockdiv && devc->samplerate > 0) |
5874e88d DE |
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 | ||
e6e54bd2 DE |
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) { | |
93b118da UH |
111 | case EDGE_POSITIVE: |
112 | trigger_mask |= (uint64_t)1 << 35; | |
225d3cb0 | 113 | break; |
93b118da UH |
114 | case EDGE_NEGATIVE: |
115 | trigger_mask |= (uint64_t)1 << 34; | |
225d3cb0 | 116 | break; |
e6e54bd2 DE |
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); | |
5874e88d DE |
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 | ||
225d3cb0 DE |
135 | /* Fill remaining words with zeroes. */ |
136 | memset(&command[27], 0, sizeof(command) - 27 * sizeof(command[0])); | |
5874e88d | 137 | |
ce3ecb70 | 138 | return lwla_send_command(sdi->conn, command, ARRAY_SIZE(command)); |
5874e88d DE |
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 | ||
29d58767 | 245 | acq->samples_done = 0; |
5874e88d DE |
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 | ||
2cfd16a3 DE |
252 | /* Sample position in the packet output buffer. */ |
253 | acq->out_index = 0; | |
5874e88d DE |
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_CTRL2; | |
261 | regvals[1].val = 2; | |
262 | ||
263 | regvals[2].reg = REG_MEM_CTRL4; | |
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 | ||
d02d4754 DE |
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 | */ | |
5874e88d DE |
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 | ||
57ba5f3d | 287 | /* Decode an incoming response to a buffer fill level request and act on it |
5874e88d DE |
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 | } | |
e0df15d4 | 304 | acq->mem_addr_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]); |
5874e88d | 305 | |
9497f49e | 306 | sr_dbg("%zu words in capture buffer.", acq->mem_addr_fill); |
5874e88d | 307 | |
c81069b3 | 308 | if (acq->mem_addr_fill > 0 && !devc->cancel_requested) |
5874e88d DE |
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_CMD_CTRL2; | |
331 | regvals[0].val = 10; | |
332 | ||
333 | regvals[1].reg = REG_CMD_CTRL3; | |
334 | regvals[1].val = 0; | |
335 | ||
336 | regvals[2].reg = REG_CMD_CTRL4; | |
337 | regvals[2].val = 0; | |
338 | ||
339 | regvals[3].reg = REG_CMD_CTRL1; | |
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 | ||
f3f19d11 | 354 | /* Decode an incoming capture status response and act on it as appropriate. |
5874e88d DE |
355 | * Note that this function changes the device state. |
356 | */ | |
357 | static void process_capture_status(const struct sr_dev_inst *sdi) | |
358 | { | |
8a3ddd88 | 359 | uint64_t duration; |
5874e88d DE |
360 | struct dev_context *devc; |
361 | struct acquisition_state *acq; | |
9497f49e DE |
362 | unsigned int mem_fill; |
363 | unsigned int flags; | |
5874e88d DE |
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 | /* TODO: Find out the actual bit width of these fields as stored | |
376 | * in the FPGA. These fields are definitely less than 64 bit wide | |
377 | * internally, and the unused bits occasionally even contain garbage. | |
378 | */ | |
e0df15d4 DE |
379 | mem_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]); |
380 | duration = LWLA_TO_UINT32(acq->xfer_buf_in[4]); | |
381 | flags = LWLA_TO_UINT32(acq->xfer_buf_in[8]) & STATUS_FLAG_MASK; | |
5874e88d | 382 | |
29d58767 DE |
383 | /* The LWLA1034 runs at 125 MHz if the clock divider is bypassed. |
384 | * However, the time base used for the duration is apparently not | |
385 | * adjusted for this "boost" mode. Whereas normally the duration | |
386 | * unit is 1 ms, it is 0.8 ms when the clock divider is bypassed. | |
387 | * As 0.8 = 100 MHz / 125 MHz, it seems that the internal cycle | |
388 | * counter period is the same as at the 100 MHz setting. | |
8a3ddd88 | 389 | */ |
29d58767 DE |
390 | if (acq->bypass_clockdiv) |
391 | acq->duration_now = duration * 4 / 5; | |
392 | else | |
393 | acq->duration_now = duration; | |
8a3ddd88 | 394 | |
9497f49e DE |
395 | sr_spew("Captured %u words, %" PRIu64 " ms, flags 0x%02X.", |
396 | mem_fill, acq->duration_now, flags); | |
397 | ||
398 | if ((flags & STATUS_TRIGGERED) > (acq->capture_flags & STATUS_TRIGGERED)) | |
399 | sr_info("Capture triggered."); | |
400 | ||
401 | acq->capture_flags = flags; | |
5874e88d | 402 | |
29d58767 | 403 | if (acq->duration_now >= acq->duration_max) { |
9497f49e | 404 | sr_dbg("Time limit reached, stopping capture."); |
5874e88d DE |
405 | issue_stop_capture(sdi); |
406 | return; | |
407 | } | |
408 | devc->state = STATE_STATUS_WAIT; | |
409 | ||
410 | if ((acq->capture_flags & STATUS_TRIGGERED) == 0) { | |
411 | sr_spew("Waiting for trigger."); | |
412 | } else if ((acq->capture_flags & STATUS_MEM_AVAIL) == 0) { | |
413 | sr_dbg("Capture memory filled."); | |
414 | request_capture_length(sdi); | |
415 | } else if ((acq->capture_flags & STATUS_CAPTURING) != 0) { | |
416 | sr_spew("Sampling in progress."); | |
417 | } | |
418 | } | |
419 | ||
420 | /* Issue a capture buffer read request as an asynchronous USB transfer. | |
421 | * The address and size of the memory area to read are derived from the | |
422 | * current acquisition state. | |
423 | */ | |
424 | static void request_read_mem(const struct sr_dev_inst *sdi) | |
425 | { | |
426 | struct dev_context *devc; | |
427 | struct acquisition_state *acq; | |
428 | size_t count; | |
429 | ||
430 | devc = sdi->priv; | |
431 | acq = devc->acquisition; | |
432 | ||
433 | if (acq->mem_addr_next >= acq->mem_addr_stop) | |
434 | return; | |
435 | ||
436 | /* Always read a multiple of 8 device words. */ | |
437 | count = (acq->mem_addr_stop - acq->mem_addr_next + 7) / 8 * 8; | |
438 | count = MIN(count, READ_CHUNK_LEN); | |
439 | ||
440 | acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_MEM); | |
441 | acq->xfer_buf_out[1] = LWLA_WORD_0(acq->mem_addr_next); | |
442 | acq->xfer_buf_out[2] = LWLA_WORD_1(acq->mem_addr_next); | |
443 | acq->xfer_buf_out[3] = LWLA_WORD_0(count); | |
444 | acq->xfer_buf_out[4] = LWLA_WORD_1(count); | |
445 | ||
446 | acq->xfer_out->length = 5 * sizeof(uint16_t); | |
447 | ||
448 | if (submit_transfer(devc, acq->xfer_out) == SR_OK) { | |
449 | acq->mem_addr_next += count; | |
450 | devc->state = STATE_READ_REQUEST; | |
451 | } | |
452 | } | |
453 | ||
5874e88d DE |
454 | /* Demangle and decompress incoming sample data from the capture buffer. |
455 | * The data chunk is taken from the acquisition state, and is expected to | |
456 | * contain a multiple of 8 device words. | |
457 | * All data currently in the acquisition buffer will be processed. Packets | |
458 | * of decoded samples are sent off to the session bus whenever the output | |
459 | * buffer becomes full while decoding. | |
460 | */ | |
461 | static int process_sample_data(const struct sr_dev_inst *sdi) | |
462 | { | |
463 | uint64_t sample; | |
5874e88d DE |
464 | uint64_t high_nibbles; |
465 | uint64_t word; | |
466 | struct dev_context *devc; | |
467 | struct acquisition_state *acq; | |
468 | uint8_t *out_p; | |
e0df15d4 | 469 | uint32_t *slice; |
2cfd16a3 DE |
470 | struct sr_datafeed_packet packet; |
471 | struct sr_datafeed_logic logic; | |
5874e88d DE |
472 | size_t expect_len; |
473 | size_t actual_len; | |
2cfd16a3 DE |
474 | size_t out_max_samples; |
475 | size_t out_run_samples; | |
476 | size_t ri; | |
5874e88d DE |
477 | size_t in_words_left; |
478 | size_t si; | |
479 | ||
480 | devc = sdi->priv; | |
481 | acq = devc->acquisition; | |
482 | ||
483 | if (acq->mem_addr_done >= acq->mem_addr_stop | |
29d58767 | 484 | || acq->samples_done >= acq->samples_max) |
5874e88d DE |
485 | return SR_OK; |
486 | ||
487 | in_words_left = MIN(acq->mem_addr_stop - acq->mem_addr_done, | |
488 | READ_CHUNK_LEN); | |
e0df15d4 | 489 | expect_len = LWLA1034_MEMBUF_LEN(in_words_left) * sizeof(uint32_t); |
5874e88d DE |
490 | actual_len = acq->xfer_in->actual_length; |
491 | ||
492 | if (actual_len != expect_len) { | |
9497f49e DE |
493 | sr_err("Received size %zu does not match expected size %zu.", |
494 | actual_len, expect_len); | |
5874e88d DE |
495 | devc->transfer_error = TRUE; |
496 | return SR_ERR; | |
497 | } | |
498 | acq->mem_addr_done += in_words_left; | |
2cfd16a3 DE |
499 | |
500 | /* Prepare session packet. */ | |
501 | packet.type = SR_DF_LOGIC; | |
502 | packet.payload = &logic; | |
503 | logic.unitsize = UNIT_SIZE; | |
504 | logic.data = acq->out_packet; | |
505 | ||
5874e88d DE |
506 | slice = acq->xfer_buf_in; |
507 | si = 0; /* word index within slice */ | |
508 | ||
509 | for (;;) { | |
2cfd16a3 DE |
510 | /* Calculate number of samples to write into packet. */ |
511 | out_max_samples = MIN(acq->samples_max - acq->samples_done, | |
512 | PACKET_LENGTH - acq->out_index); | |
513 | out_run_samples = MIN(acq->run_len, out_max_samples); | |
514 | ||
5874e88d | 515 | /* Expand run-length samples into session packet. */ |
2cfd16a3 DE |
516 | sample = acq->sample; |
517 | out_p = &acq->out_packet[acq->out_index * UNIT_SIZE]; | |
518 | ||
519 | for (ri = 0; ri < out_run_samples; ++ri) { | |
5874e88d DE |
520 | out_p[0] = sample & 0xFF; |
521 | out_p[1] = (sample >> 8) & 0xFF; | |
522 | out_p[2] = (sample >> 16) & 0xFF; | |
523 | out_p[3] = (sample >> 24) & 0xFF; | |
524 | out_p[4] = (sample >> 32) & 0xFF; | |
2cfd16a3 DE |
525 | out_p += UNIT_SIZE; |
526 | } | |
527 | acq->run_len -= out_run_samples; | |
528 | acq->out_index += out_run_samples; | |
529 | acq->samples_done += out_run_samples; | |
530 | ||
531 | /* Packet full or sample count limit reached? */ | |
532 | if (out_run_samples == out_max_samples) { | |
533 | logic.length = acq->out_index * UNIT_SIZE; | |
534 | sr_session_send(sdi, &packet); | |
535 | acq->out_index = 0; | |
536 | ||
537 | if (acq->samples_done >= acq->samples_max) | |
538 | return SR_OK; /* sample limit reached */ | |
539 | if (acq->run_len > 0) | |
540 | continue; /* need another packet */ | |
5874e88d | 541 | } |
5874e88d DE |
542 | |
543 | if (in_words_left == 0) | |
544 | break; /* done with current chunk */ | |
545 | ||
546 | /* Now work on the current slice. */ | |
e0df15d4 DE |
547 | high_nibbles = LWLA_TO_UINT32(slice[8]); |
548 | word = LWLA_TO_UINT32(slice[si]); | |
5874e88d DE |
549 | word |= (high_nibbles << (4 * si + 4)) & ((uint64_t)0xF << 32); |
550 | ||
551 | if (acq->rle == RLE_STATE_DATA) { | |
552 | acq->sample = word & ALL_CHANNELS_MASK; | |
3f239f08 | 553 | acq->run_len = ((word >> NUM_CHANNELS) & 1) + 1; |
5874e88d DE |
554 | if (word & RLE_FLAG_LEN_FOLLOWS) |
555 | acq->rle = RLE_STATE_LEN; | |
556 | } else { | |
557 | acq->run_len += word << 1; | |
558 | acq->rle = RLE_STATE_DATA; | |
559 | } | |
560 | ||
561 | /* Move to next word. */ | |
e0df15d4 DE |
562 | si = (si + 1) % 8; |
563 | if (si == 0) | |
564 | slice += 9; | |
5874e88d DE |
565 | --in_words_left; |
566 | } | |
567 | ||
2cfd16a3 DE |
568 | /* Send out partially filled packet if this was the last chunk. */ |
569 | if (acq->mem_addr_done >= acq->mem_addr_stop && acq->out_index > 0) { | |
570 | logic.length = acq->out_index * UNIT_SIZE; | |
571 | sr_session_send(sdi, &packet); | |
572 | acq->out_index = 0; | |
573 | } | |
5874e88d DE |
574 | return SR_OK; |
575 | } | |
576 | ||
577 | /* Finish an acquisition session. This sends the end packet to the session | |
578 | * bus and removes the listener for asynchronous USB transfers. | |
579 | */ | |
580 | static void end_acquisition(struct sr_dev_inst *sdi) | |
581 | { | |
582 | struct drv_context *drvc; | |
583 | struct dev_context *devc; | |
584 | struct sr_datafeed_packet packet; | |
585 | ||
338143ea | 586 | drvc = sdi->driver->context; |
5874e88d DE |
587 | devc = sdi->priv; |
588 | ||
589 | if (devc->state == STATE_IDLE) | |
590 | return; | |
591 | ||
592 | devc->state = STATE_IDLE; | |
593 | ||
594 | /* Remove USB file descriptors from polling. */ | |
102f1239 | 595 | usb_source_remove(sdi->session, drvc->sr_ctx); |
5874e88d DE |
596 | |
597 | packet.type = SR_DF_END; | |
598 | sr_session_send(sdi, &packet); | |
599 | ||
600 | lwla_free_acquisition_state(devc->acquisition); | |
601 | devc->acquisition = NULL; | |
c81069b3 | 602 | devc->cancel_requested = FALSE; |
5874e88d DE |
603 | } |
604 | ||
605 | /* USB output transfer completion callback. | |
606 | */ | |
55462b8b | 607 | static void LIBUSB_CALL receive_transfer_out(struct libusb_transfer *transfer) |
5874e88d DE |
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: | |
c81069b3 | 633 | if (!devc->cancel_requested) |
5874e88d DE |
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 | */ | |
55462b8b | 661 | static void LIBUSB_CALL receive_transfer_in(struct libusb_transfer *transfer) |
5874e88d DE |
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 | |
29d58767 | 687 | && acq->samples_done < acq->samples_max) |
5874e88d DE |
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 | ||
5874e88d | 709 | /* Force reload of bitstream */ |
6358f0a9 | 710 | devc->cur_clock_config = CONF_CLOCK_NONE; |
5874e88d | 711 | |
6358f0a9 | 712 | ret = lwla_set_clock_config(sdi); |
5874e88d DE |
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; | |
9497f49e | 724 | sr_dbg("Received test word 0x%08X back.", value); |
5874e88d DE |
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; | |
9497f49e | 731 | sr_dbg("Received test word 0x%08X back.", value); |
5874e88d DE |
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; | |
9497f49e | 738 | sr_dbg("Received test word 0x%08X back.", value); |
5874e88d DE |
739 | if (value != 0x87654321) |
740 | return SR_ERR; | |
741 | ||
742 | return ret; | |
743 | } | |
744 | ||
6358f0a9 DE |
745 | /* Select the LWLA clock configuration. If the clock source changed from |
746 | * the previous setting, this will download a new bitstream to the FPGA. | |
5874e88d | 747 | */ |
6358f0a9 | 748 | SR_PRIV int lwla_set_clock_config(const struct sr_dev_inst *sdi) |
5874e88d DE |
749 | { |
750 | struct dev_context *devc; | |
8e2d6c9d | 751 | struct drv_context *drvc; |
5874e88d | 752 | int ret; |
6358f0a9 | 753 | enum clock_config choice; |
5874e88d DE |
754 | |
755 | devc = sdi->priv; | |
8e2d6c9d | 756 | drvc = sdi->driver->context; |
5874e88d | 757 | |
6358f0a9 DE |
758 | if (sdi->status == SR_ST_INACTIVE) |
759 | choice = CONF_CLOCK_NONE; | |
760 | else if (devc->cfg_clock_source == CLOCK_INTERNAL) | |
761 | choice = CONF_CLOCK_INT; | |
762 | else if (devc->cfg_clock_edge == EDGE_POSITIVE) | |
763 | choice = CONF_CLOCK_EXT_RISE; | |
764 | else | |
765 | choice = CONF_CLOCK_EXT_FALL; | |
766 | ||
767 | if (choice != devc->cur_clock_config) { | |
768 | devc->cur_clock_config = CONF_CLOCK_NONE; | |
8e2d6c9d DE |
769 | ret = lwla_send_bitstream(drvc->sr_ctx, sdi->conn, |
770 | bitstream_map[choice]); | |
945e4343 | 771 | if (ret == SR_OK) |
6358f0a9 | 772 | devc->cur_clock_config = choice; |
945e4343 | 773 | return ret; |
aeaad0b0 | 774 | } |
5874e88d DE |
775 | return SR_OK; |
776 | } | |
777 | ||
778 | /* Configure the LWLA in preparation for an acquisition session. | |
779 | */ | |
780 | SR_PRIV int lwla_setup_acquisition(const struct sr_dev_inst *sdi) | |
781 | { | |
782 | struct dev_context *devc; | |
783 | struct sr_usb_dev_inst *usb; | |
29d58767 | 784 | struct acquisition_state *acq; |
5874e88d DE |
785 | struct regval_pair regvals[7]; |
786 | int ret; | |
787 | ||
788 | devc = sdi->priv; | |
789 | usb = sdi->conn; | |
29d58767 DE |
790 | acq = devc->acquisition; |
791 | ||
9497f49e DE |
792 | if (devc->limit_msec > 0) { |
793 | acq->duration_max = devc->limit_msec; | |
794 | sr_info("Acquisition time limit %" PRIu64 " ms.", | |
795 | devc->limit_msec); | |
796 | } else | |
797 | acq->duration_max = MAX_LIMIT_MSEC; | |
798 | ||
799 | if (devc->limit_samples > 0) { | |
800 | acq->samples_max = devc->limit_samples; | |
801 | sr_info("Acquisition sample count limit %" PRIu64 ".", | |
802 | devc->limit_samples); | |
803 | } else | |
804 | acq->samples_max = MAX_LIMIT_SAMPLES; | |
29d58767 | 805 | |
6358f0a9 | 806 | if (devc->cfg_clock_source == CLOCK_INTERNAL) { |
9497f49e DE |
807 | sr_info("Internal clock, samplerate %" PRIu64 ".", |
808 | devc->samplerate); | |
29d58767 DE |
809 | if (devc->samplerate == 0) |
810 | return SR_ERR_BUG; | |
811 | /* At 125 MHz, the clock divider is bypassed. */ | |
812 | acq->bypass_clockdiv = (devc->samplerate > SR_MHZ(100)); | |
813 | ||
814 | /* If only one of the limits is set, derive the other one. */ | |
815 | if (devc->limit_msec == 0 && devc->limit_samples > 0) | |
816 | acq->duration_max = devc->limit_samples | |
817 | * 1000 / devc->samplerate + 1; | |
818 | else if (devc->limit_samples == 0 && devc->limit_msec > 0) | |
819 | acq->samples_max = devc->limit_msec | |
820 | * devc->samplerate / 1000; | |
6358f0a9 | 821 | } else { |
29d58767 | 822 | acq->bypass_clockdiv = TRUE; |
6358f0a9 DE |
823 | |
824 | if (devc->cfg_clock_edge == EDGE_NEGATIVE) | |
825 | sr_info("External clock, falling edge."); | |
826 | else | |
827 | sr_info("External clock, rising edge."); | |
29d58767 | 828 | } |
5874e88d DE |
829 | |
830 | regvals[0].reg = REG_MEM_CTRL2; | |
831 | regvals[0].val = 2; | |
832 | ||
833 | regvals[1].reg = REG_MEM_CTRL2; | |
834 | regvals[1].val = 1; | |
835 | ||
836 | regvals[2].reg = REG_CMD_CTRL2; | |
837 | regvals[2].val = 10; | |
838 | ||
839 | regvals[3].reg = REG_CMD_CTRL3; | |
840 | regvals[3].val = 0x74; | |
841 | ||
842 | regvals[4].reg = REG_CMD_CTRL4; | |
843 | regvals[4].val = 0; | |
844 | ||
845 | regvals[5].reg = REG_CMD_CTRL1; | |
846 | regvals[5].val = 0; | |
847 | ||
848 | regvals[6].reg = REG_DIV_BYPASS; | |
29d58767 | 849 | regvals[6].val = acq->bypass_clockdiv; |
5874e88d | 850 | |
ce3ecb70 | 851 | ret = lwla_write_regs(usb, regvals, ARRAY_SIZE(regvals)); |
5874e88d DE |
852 | if (ret != SR_OK) |
853 | return ret; | |
854 | ||
855 | return capture_setup(sdi); | |
856 | } | |
857 | ||
858 | /* Start the capture operation on the LWLA device. Beginning with this | |
859 | * function, all USB transfers will be asynchronous until the end of the | |
860 | * acquisition session. | |
861 | */ | |
862 | SR_PRIV int lwla_start_acquisition(const struct sr_dev_inst *sdi) | |
863 | { | |
864 | struct dev_context *devc; | |
865 | struct sr_usb_dev_inst *usb; | |
866 | struct acquisition_state *acq; | |
867 | struct regval_pair *regvals; | |
868 | ||
869 | devc = sdi->priv; | |
870 | usb = sdi->conn; | |
871 | acq = devc->acquisition; | |
872 | ||
9497f49e DE |
873 | acq->duration_now = 0; |
874 | acq->mem_addr_fill = 0; | |
875 | acq->capture_flags = 0; | |
29d58767 | 876 | |
5874e88d DE |
877 | libusb_fill_bulk_transfer(acq->xfer_out, usb->devhdl, EP_COMMAND, |
878 | (unsigned char *)acq->xfer_buf_out, 0, | |
879 | &receive_transfer_out, | |
1a46cc62 | 880 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); |
5874e88d DE |
881 | |
882 | libusb_fill_bulk_transfer(acq->xfer_in, usb->devhdl, EP_REPLY, | |
883 | (unsigned char *)acq->xfer_buf_in, | |
884 | sizeof acq->xfer_buf_in, | |
885 | &receive_transfer_in, | |
1a46cc62 | 886 | (struct sr_dev_inst *)sdi, USB_TIMEOUT_MS); |
5874e88d DE |
887 | |
888 | regvals = devc->reg_write_seq; | |
889 | ||
890 | regvals[0].reg = REG_CMD_CTRL2; | |
891 | regvals[0].val = 10; | |
892 | ||
893 | regvals[1].reg = REG_CMD_CTRL3; | |
894 | regvals[1].val = 1; | |
895 | ||
896 | regvals[2].reg = REG_CMD_CTRL4; | |
897 | regvals[2].val = 0; | |
898 | ||
899 | regvals[3].reg = REG_CMD_CTRL1; | |
900 | regvals[3].val = 0; | |
901 | ||
902 | devc->reg_write_pos = 0; | |
903 | devc->reg_write_len = 4; | |
904 | ||
905 | devc->state = STATE_START_CAPTURE; | |
906 | ||
907 | return issue_next_write_reg(sdi); | |
908 | } | |
909 | ||
910 | /* Allocate an acquisition state object. | |
911 | */ | |
912 | SR_PRIV struct acquisition_state *lwla_alloc_acquisition_state(void) | |
913 | { | |
914 | struct acquisition_state *acq; | |
915 | ||
a95f142e | 916 | acq = g_malloc0(sizeof(struct acquisition_state)); |
5874e88d DE |
917 | |
918 | acq->xfer_in = libusb_alloc_transfer(0); | |
919 | if (!acq->xfer_in) { | |
920 | sr_err("Transfer malloc failed."); | |
921 | g_free(acq); | |
922 | return NULL; | |
923 | } | |
924 | ||
925 | acq->xfer_out = libusb_alloc_transfer(0); | |
926 | if (!acq->xfer_out) { | |
927 | sr_err("Transfer malloc failed."); | |
928 | libusb_free_transfer(acq->xfer_in); | |
929 | g_free(acq); | |
930 | return NULL; | |
931 | } | |
932 | ||
933 | return acq; | |
934 | } | |
935 | ||
936 | /* Deallocate an acquisition state object. | |
937 | */ | |
938 | SR_PRIV void lwla_free_acquisition_state(struct acquisition_state *acq) | |
939 | { | |
940 | if (acq) { | |
941 | libusb_free_transfer(acq->xfer_out); | |
942 | libusb_free_transfer(acq->xfer_in); | |
943 | g_free(acq); | |
944 | } | |
945 | } | |
946 | ||
947 | /* USB I/O source callback. | |
948 | */ | |
949 | SR_PRIV int lwla_receive_data(int fd, int revents, void *cb_data) | |
950 | { | |
951 | struct sr_dev_inst *sdi; | |
952 | struct dev_context *devc; | |
953 | struct drv_context *drvc; | |
954 | struct timeval tv; | |
955 | int ret; | |
956 | ||
957 | (void)fd; | |
958 | ||
959 | sdi = cb_data; | |
960 | devc = sdi->priv; | |
338143ea | 961 | drvc = sdi->driver->context; |
5874e88d DE |
962 | |
963 | if (!devc || !drvc) | |
964 | return FALSE; | |
965 | ||
966 | /* No timeout: return immediately. */ | |
967 | tv.tv_sec = 0; | |
968 | tv.tv_usec = 0; | |
969 | ||
970 | ret = libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, | |
971 | &tv, NULL); | |
972 | if (ret != 0) | |
973 | sr_err("Event handling failed: %s.", libusb_error_name(ret)); | |
974 | ||
975 | /* If no event flags are set the timeout must have expired. */ | |
976 | if (revents == 0 && devc->state == STATE_STATUS_WAIT) { | |
c81069b3 | 977 | if (devc->cancel_requested) |
5874e88d DE |
978 | issue_stop_capture(sdi); |
979 | else | |
980 | request_capture_status(sdi); | |
981 | } | |
982 | ||
983 | /* Check if an error occurred on a transfer. */ | |
984 | if (devc->transfer_error) | |
985 | end_acquisition(sdi); | |
aeaad0b0 DE |
986 | |
987 | return TRUE; | |
988 | } |