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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2022 Shawn Walker <ac0bi00@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 | #define _GNU_SOURCE | |
20 | ||
21 | #include <config.h> | |
22 | #include <errno.h> | |
23 | #include <glib.h> | |
24 | #include <math.h> | |
25 | #include <stdlib.h> | |
26 | #include <stdarg.h> | |
27 | #include <string.h> | |
28 | #include <time.h> | |
29 | #include <unistd.h> | |
30 | #include <libsigrok/libsigrok.h> | |
31 | #include "libsigrok-internal.h" | |
32 | #include "protocol.h" | |
33 | ||
34 | SR_PRIV int send_serial_str(struct sr_serial_dev_inst *serial, char *str) | |
35 | { | |
36 | int len = strlen(str); | |
37 | if ((len > 15) || (len < 1)) { | |
38 | sr_err("ERROR: Serial string len %d invalid ", len); | |
39 | return SR_ERR; | |
40 | } | |
41 | ||
42 | /* 100ms timeout. With USB CDC serial we can't define the timeout based | |
43 | * on link rate, so just pick something large as we shouldn't normally | |
44 | * see them */ | |
45 | if (serial_write_blocking(serial, str, len, 100) != len) { | |
46 | sr_err("ERROR: Serial str write failed"); | |
47 | return SR_ERR; | |
48 | } | |
49 | ||
50 | return SR_OK; | |
51 | } | |
52 | ||
53 | SR_PRIV int send_serial_char(struct sr_serial_dev_inst *serial, char ch) | |
54 | { | |
55 | char buf[1]; | |
56 | buf[0] = ch; | |
57 | ||
58 | if (serial_write_blocking(serial, buf, 1, 100) != 1) { /* 100ms */ | |
59 | sr_err("ERROR: Serial char write failed"); | |
60 | return SR_ERR; | |
61 | } | |
62 | ||
63 | return SR_OK; | |
64 | } | |
65 | ||
66 | /* Issue a command that expects a string return that is less than 30 characters. | |
67 | * Returns the length of string */ | |
68 | int send_serial_w_resp(struct sr_serial_dev_inst *serial, char *str, | |
69 | char *resp, size_t cnt) | |
70 | { | |
71 | int num_read, i; | |
72 | send_serial_str(serial, str); | |
73 | ||
74 | /* Using the serial_read_blocking function when reading a response of | |
75 | * unknown length requires a long worst case timeout to always be taken. | |
76 | * So, instead loop waiting for a first byte, and then a final small delay | |
77 | * for the rest. */ | |
78 | for (i = 0; i < 1000; i++) { /* wait up to 1 second in ms increments */ | |
79 | num_read = serial_read_blocking(serial, resp, cnt, 1); | |
80 | if (num_read > 0) | |
81 | break; | |
82 | } | |
83 | ||
84 | /* Since the serial port is USB CDC we can't calculate timeouts based on | |
85 | * baud rate but even if the response is split between two USB transfers, | |
86 | * 10ms should be plenty. */ | |
87 | num_read += serial_read_blocking(serial, &(resp[num_read]), cnt - num_read, | |
88 | 10); | |
89 | if ((num_read < 1) || (num_read > 30)) { | |
90 | sr_err("ERROR: Serial_w_resp failed (%d).", num_read); | |
91 | return -1; | |
92 | } else | |
93 | return num_read; | |
94 | } | |
95 | ||
96 | /* Issue a command that expects a single char ack */ | |
97 | SR_PRIV int send_serial_w_ack(struct sr_serial_dev_inst *serial, char *str) | |
98 | { | |
99 | char buf[2]; | |
100 | int num_read; | |
101 | ||
102 | /* In case we have left over transfer from the device, drain them. | |
103 | * These should not exist in normal operation */ | |
104 | while ((num_read = serial_read_blocking(serial, buf, 2, 10))) | |
105 | sr_dbg("swack drops 2 bytes %d %d", buf[0], buf[1]); | |
106 | ||
107 | send_serial_str(serial, str); | |
108 | ||
109 | /* 1000ms timeout */ | |
110 | num_read = serial_read_blocking(serial, buf, 1, 1000); | |
111 | ||
112 | if ((num_read == 1) && (buf[0] == '*')) { | |
113 | return SR_OK; | |
114 | } else { | |
115 | sr_err("ERROR: Serial_w_ack %s failed (%d).", str, num_read); | |
116 | if (num_read) | |
117 | sr_err("ack resp char %c d %d", buf[0], buf[0]); | |
118 | return SR_ERR; | |
119 | } | |
120 | } | |
121 | ||
122 | /* Process incoming data stream assuming it is optimized packing of 4 channels | |
123 | * or less. | |
124 | * Each byte is 4 channels of data and a 3 bit rle value, or a larger rle value, | |
125 | * or a control signal. This also checks for aborts and ends. | |
126 | * If an end is seen we stop processing but do not check the byte_cnt | |
127 | * The output is a set of samples fed to process group to perform sw triggering | |
128 | * and sending of data to the session as well as maintenance of the serial rx | |
129 | * byte cnt. | |
130 | * Since we can get huge rle values we chop them up for processing into smaller | |
131 | * groups. | |
132 | * In this mode we can always consume all bytes because there are no cases where | |
133 | * the processing of one byte requires the one after it. */ | |
134 | void process_D4(struct sr_dev_inst *sdi, struct dev_context *d) | |
135 | { | |
136 | uint32_t j; | |
137 | uint8_t cbyte, cval; | |
138 | uint32_t rlecnt = 0; | |
139 | ||
140 | while (d->ser_rdptr < d->bytes_avail) { | |
141 | cbyte = d->buffer[(d->ser_rdptr)]; | |
142 | ||
143 | /*RLE only byte */ | |
144 | if ((cbyte >= 48) && (cbyte <= 127)) { | |
145 | rlecnt += (cbyte - 47) * 8; | |
146 | d->byte_cnt++; | |
147 | } else if (cbyte >= 0x80) { /* sample with possible rle */ | |
148 | rlecnt += (cbyte & 0x70) >> 4; | |
149 | if (rlecnt) { | |
150 | /* On a value change, duplicate the previous values first. */ | |
151 | rle_memset(d, rlecnt); | |
152 | rlecnt = 0; | |
153 | } | |
154 | /* Finally add in the new values */ | |
155 | cval = cbyte & 0xF; | |
156 | uint32_t didx = (d->cbuf_wrptr) * (d->dig_sample_bytes); | |
157 | d->d_data_buf[didx] = cval; | |
158 | ||
159 | /* Pad in all other bytes since the sessions even wants disabled | |
160 | * channels reported */ | |
161 | for (j = 1; j < d->dig_sample_bytes; j++) | |
162 | d->d_data_buf[didx+j] = 0; | |
163 | ||
164 | d->byte_cnt++; | |
165 | sr_spew("Dchan4 rdptr %d wrptr %d bytein 0x%X rle %d cval 0x%X didx %d", | |
166 | (d->ser_rdptr) - 1, d->cbuf_wrptr, cbyte, rlecnt, cval, didx); | |
167 | d->cbuf_wrptr++; | |
168 | rlecnt = 0; | |
169 | d->d_last[0] = cval; | |
170 | } else { | |
171 | /* Any other character ends parsing - it could be a frame error or a | |
172 | * start of the final byte cnt */ | |
173 | if (cbyte == '$') { | |
174 | sr_info("D4 Data stream stops with cbyte %d char %c rdidx %d cnt %lu", | |
175 | cbyte, cbyte, d->ser_rdptr, d->byte_cnt); | |
176 | d->rxstate = RX_STOPPED; | |
177 | } else { | |
178 | sr_err("D4 Data stream aborts with cbyte %d char %c rdidx %d cnt %lu", | |
179 | cbyte, cbyte, d->ser_rdptr, d->byte_cnt); | |
180 | d->rxstate = RX_ABORT; | |
181 | } | |
182 | break; /* break from while loop */ | |
183 | } | |
184 | ||
185 | (d->ser_rdptr)++; | |
186 | /* To ensure we don't overflow the sample buffer, but still send it | |
187 | * large chunks of data (to make the packet sends to the session | |
188 | * efficient) only call process group after a large number of samples | |
189 | * have been seen. cbuf_wrptr counts slices, so shift right by 2 to | |
190 | * create a worst case x4 multiple ratio of cbuf_wrptr value to the | |
191 | * depth of the sample buffer. | |
192 | * Likely we could use the max rle value of 640 but 1024 gives some | |
193 | * extra room. Also do a simple check of rlecnt>2000 since that is a | |
194 | * reasonable minimal value to send to the session */ | |
195 | if ((rlecnt >= 2000) || \ | |
196 | ((rlecnt + ((d->cbuf_wrptr) <<2 ))) > (d->sample_buf_size - 1024)) { | |
197 | sr_spew("D4 preoverflow wrptr %d bufsize %d rlecnt %d\n\r", | |
198 | d->cbuf_wrptr, d->sample_buf_size, rlecnt); | |
199 | rle_memset(d, rlecnt); | |
200 | process_group(sdi, d, d->cbuf_wrptr); | |
201 | rlecnt = 0; | |
202 | } | |
203 | ||
204 | } /*while rdptr < wrptr*/ | |
205 | ||
206 | sr_spew("D4 while done rdptr %d", d->ser_rdptr); | |
207 | ||
208 | /* If we reach the end of the serial input stream send any remaining values | |
209 | * or rles to the session */ | |
210 | if (rlecnt) { | |
211 | sr_spew("Residual D4 slice rlecnt %d", rlecnt); | |
212 | rle_memset(d, rlecnt); | |
213 | } | |
214 | if (d->cbuf_wrptr) { | |
215 | sr_spew("Residual D4 data wrptr %d", d->cbuf_wrptr); | |
216 | process_group(sdi, d, d->cbuf_wrptr); | |
217 | } | |
218 | } | |
219 | ||
220 | /* Process incoming data stream and forward to trigger processing with | |
221 | * process_group | |
222 | * The final value of ser_rdptr indicates how many bytes were processed. | |
223 | * This version handles all other enabled channel configurations that | |
224 | * Process_D4 doesn't */ | |
225 | void process_slice(struct sr_dev_inst *sdi, struct dev_context *devc) | |
226 | { | |
227 | int32_t i; | |
228 | uint32_t tmp32, cword; | |
229 | uint8_t cbyte; | |
230 | uint32_t slice_bytes; /* Number of bytes that have legal slice values including RLE */ | |
231 | ||
232 | /* Only process legal data values for this mode which are 0x32-0x7F for RLE and 0x80 to 0xFF for data*/ | |
233 | for (slice_bytes = 1; (slice_bytes < devc->bytes_avail) | |
234 | && (devc->buffer[slice_bytes - 1] >= 0x30); slice_bytes++); | |
235 | ||
236 | if (slice_bytes != devc->bytes_avail) { | |
237 | cbyte = devc->buffer[slice_bytes - 1]; | |
238 | slice_bytes--; /* Don't process the ending character */ | |
239 | if (cbyte == '$') { | |
240 | sr_info("Data stream stops with cbyte %d char %c rdidx %d sbytes %d cnt %lu", | |
241 | cbyte, cbyte, devc->ser_rdptr, slice_bytes, devc->byte_cnt); | |
242 | devc->rxstate = RX_STOPPED; | |
243 | } else { | |
244 | sr_err("Data stream aborts with cbyte %d char %c rdidx %d sbytes %d cnt %lu", | |
245 | cbyte, cbyte, devc->ser_rdptr, slice_bytes, devc->byte_cnt); | |
246 | devc->rxstate = RX_ABORT; | |
247 | } | |
248 | } | |
249 | ||
250 | /* If the wrptr is non-zero due to a residual from the previous serial | |
251 | * transfer, don't double count it towards byte_cnt*/ | |
252 | devc->byte_cnt += slice_bytes - (devc->wrptr); | |
253 | ||
254 | sr_spew("process slice avail %d rdptr %d sb %d byte_cnt %" PRIu64 "", | |
255 | devc->bytes_avail, devc->ser_rdptr, slice_bytes, devc->byte_cnt); | |
256 | ||
257 | /* Must have a full slice or one rle byte */ | |
258 | while (((devc->ser_rdptr + devc->bytes_per_slice) <= slice_bytes) | |
259 | || ((devc->ser_rdptr < slice_bytes) && | |
260 | (devc->buffer[devc->ser_rdptr] < 0x80))) { | |
261 | ||
262 | if (devc->buffer[devc->ser_rdptr] < 0x80) { | |
263 | int16_t rlecnt; | |
264 | if (devc->buffer[devc->ser_rdptr] <= 79) | |
265 | rlecnt = devc->buffer[devc->ser_rdptr] - 47; | |
266 | else | |
267 | rlecnt = (devc->buffer[devc->ser_rdptr] - 78) * 32; | |
268 | ||
269 | sr_info("RLEcnt of %d in %d", rlecnt, devc->buffer[devc->ser_rdptr]); | |
270 | if ((rlecnt < 1) || (rlecnt > 1568)) | |
271 | sr_err("Bad rlecnt val %d in %d", | |
272 | rlecnt, devc->buffer[devc->ser_rdptr]); | |
273 | else | |
274 | rle_memset(devc,rlecnt); | |
275 | ||
276 | devc->ser_rdptr++; | |
277 | ||
278 | } else { | |
279 | cword = 0; | |
280 | /* Build up a word 7 bits at a time, using only enabled channels */ | |
281 | for (i = 0; i < devc->num_d_channels; i += 7) { | |
282 | if (((devc->d_chan_mask) >> i) & 0x7F) { | |
283 | cword |= ((devc->buffer[devc->ser_rdptr]) & 0x7F) << i; | |
284 | (devc->ser_rdptr)++; | |
285 | } | |
286 | } | |
287 | /* And then distribute 8 bits at a time to all possible channels | |
288 | * but first save of cword for rle */ | |
289 | devc->d_last[0] = cword & 0xFF; | |
290 | devc->d_last[1] = (cword >> 8) & 0xFF; | |
291 | devc->d_last[2] = (cword >> 16) & 0xFF; | |
292 | devc->d_last[3] = (cword >> 24) & 0xFF; | |
293 | ||
294 | for (i = 0; i < devc->num_d_channels; i += 8) { | |
295 | uint32_t idx = ((devc->cbuf_wrptr) * devc->dig_sample_bytes) + | |
296 | (i >> 3); | |
297 | devc->d_data_buf[idx] = cword & 0xFF; | |
298 | sr_spew("Dchan i %d wrptr %d idx %d char 0x%X cword 0x%X", | |
299 | i, devc->cbuf_wrptr, idx, devc->d_data_buf[idx], cword); | |
300 | cword >>= 8; | |
301 | } | |
302 | ||
303 | /* Each analog value is one or more 7 bit values */ | |
304 | for (i = 0; i < devc->num_a_channels; i++) { | |
305 | if ((devc->a_chan_mask >> i) & 1) { | |
306 | ||
307 | tmp32 = | |
308 | devc->buffer[devc->ser_rdptr] - 0x80; | |
309 | for(int a=1;a<devc->a_size;a++){ | |
310 | tmp32+=(devc->buffer[(devc->ser_rdptr)+a] - 0x80)<<(7*a); | |
311 | } | |
312 | devc->a_data_bufs[i][devc->cbuf_wrptr] = | |
313 | ((float) tmp32 * devc->a_scale[i]) + | |
314 | devc->a_offset[i]; | |
315 | devc->a_last[i] = | |
316 | devc->a_data_bufs[i][devc->cbuf_wrptr]; | |
317 | sr_spew | |
318 | ("AChan %d t32 %d value %f wrptr %d rdptr %d sc %f off %f", | |
319 | i, tmp32, | |
320 | devc-> | |
321 | a_data_bufs[i][devc->cbuf_wrptr], | |
322 | devc->cbuf_wrptr, devc->ser_rdptr, | |
323 | devc->a_scale[i], devc->a_offset[i]); | |
324 | devc->ser_rdptr+=devc->a_size; | |
325 | } /*if channel enabled*/ | |
326 | } /*for num_a_channels*/ | |
327 | devc->cbuf_wrptr++; | |
328 | }/*Not an RLE */ | |
329 | /*RLEs can create a large number of samples relative to the incoming serial buffer | |
330 | To prevent overflow of the sample data buffer we call process_group. | |
331 | cbuf_wrptr and sample_buf_size are both in terms of slices | |
332 | 2048 is more than needed for a max rle of 1640 on the next incoming character */ | |
333 | if((devc->cbuf_wrptr +2048) > devc->sample_buf_size){ | |
334 | sr_spew("Drain large buff %d %d\n\r",devc->cbuf_wrptr,devc->sample_buf_size); | |
335 | process_group(sdi, devc, devc->cbuf_wrptr); | |
336 | ||
337 | } | |
338 | }/* While another slice or RLE available */ | |
339 | if (devc->cbuf_wrptr){ | |
340 | process_group(sdi, devc, devc->cbuf_wrptr); | |
341 | } | |
342 | ||
343 | } | |
344 | ||
345 | /* Send the processed analog values to the session */ | |
346 | int send_analog(struct sr_dev_inst *sdi, struct dev_context *devc, | |
347 | uint32_t num_samples, uint32_t offset) | |
348 | { | |
349 | struct sr_datafeed_packet packet; | |
350 | struct sr_datafeed_analog analog; | |
351 | struct sr_analog_encoding encoding; | |
352 | struct sr_analog_meaning meaning; | |
353 | struct sr_analog_spec spec; | |
354 | struct sr_channel *ch; | |
355 | uint32_t i; | |
356 | float *fptr; | |
357 | ||
358 | sr_analog_init(&analog, &encoding, &meaning, &spec, ANALOG_DIGITS); | |
359 | for (i = 0; i < devc->num_a_channels; i++) { | |
360 | if ((devc->a_chan_mask >> i) & 1) { | |
361 | ch = devc->analog_groups[i]->channels->data; | |
362 | analog.meaning->channels = | |
363 | g_slist_append(NULL, ch); | |
364 | analog.num_samples = num_samples; | |
365 | analog.data = (devc->a_data_bufs[i]) + offset; | |
366 | fptr = analog.data; | |
367 | sr_spew | |
368 | ("send analog num %d offset %d first %f 2 %f", | |
369 | num_samples, offset, *(devc->a_data_bufs[i]), | |
370 | *fptr); | |
371 | analog.meaning->mq = SR_MQ_VOLTAGE; | |
372 | analog.meaning->unit = SR_UNIT_VOLT; | |
373 | analog.meaning->mqflags = 0; | |
374 | packet.type = SR_DF_ANALOG; | |
375 | packet.payload = &analog; | |
376 | sr_session_send(sdi, &packet); | |
377 | g_slist_free(analog.meaning->channels); | |
378 | }/* if enabled */ | |
379 | }/* for channels */ | |
380 | return 0; | |
381 | ||
382 | } | |
383 | ||
384 | /*Send the ring buffer of pre-trigger analog samples. | |
385 | The entire buffer is sent (as long as it filled once), but need send two payloads split at the | |
386 | the writeptr */ | |
387 | int send_analog_ring(struct sr_dev_inst *sdi, struct dev_context *devc, | |
388 | uint32_t num_samples) | |
389 | { | |
390 | struct sr_datafeed_packet packet; | |
391 | struct sr_datafeed_analog analog; | |
392 | struct sr_analog_encoding encoding; | |
393 | struct sr_analog_meaning meaning; | |
394 | struct sr_analog_spec spec; | |
395 | struct sr_channel *ch; | |
396 | int i; | |
397 | uint32_t num_pre, start_pre; | |
398 | uint32_t num_post, start_post; | |
399 | num_pre = | |
400 | (num_samples >= | |
401 | devc->pretrig_wr_ptr) ? devc->pretrig_wr_ptr : num_samples; | |
402 | start_pre = devc->pretrig_wr_ptr - num_pre; | |
403 | num_post = num_samples - num_pre; | |
404 | start_post = devc->pretrig_entries - num_post; | |
405 | sr_spew | |
406 | ("send_analog ring wrptr %u ns %d npre %u spre %u npost %u spost %u", | |
407 | devc->pretrig_wr_ptr, num_samples, num_pre, start_pre, | |
408 | num_post, start_post); | |
409 | float *fptr; | |
410 | sr_analog_init(&analog, &encoding, &meaning, &spec, ANALOG_DIGITS); | |
411 | for (i = 0; i < devc->num_a_channels; i++) { | |
412 | if ((devc->a_chan_mask >> i) & 1) { | |
413 | ch = devc->analog_groups[i]->channels->data; | |
414 | analog.meaning->channels = | |
415 | g_slist_append(NULL, ch); | |
416 | analog.meaning->mq = SR_MQ_VOLTAGE; | |
417 | analog.meaning->unit = SR_UNIT_VOLT; | |
418 | analog.meaning->mqflags = 0; | |
419 | packet.type = SR_DF_ANALOG; | |
420 | packet.payload = &analog; | |
421 | /*First send what is after the write pointer because it is oldest */ | |
422 | if (num_post) { | |
423 | analog.num_samples = num_post; | |
424 | analog.data = | |
425 | (devc->a_pretrig_bufs[i]) + start_post; | |
426 | for (uint32_t j = 0; | |
427 | j < analog.num_samples; j++) { | |
428 | fptr = | |
429 | analog.data + | |
430 | (j * sizeof(float)); | |
431 | } | |
432 | sr_session_send(sdi, &packet); | |
433 | } | |
434 | if (num_pre) { | |
435 | analog.num_samples = num_pre; | |
436 | analog.data = | |
437 | (devc->a_pretrig_bufs[i]) + start_pre; | |
438 | sr_dbg("Sending A%d ring buffer newest ", | |
439 | i); | |
440 | for (uint32_t j = 0; | |
441 | j < analog.num_samples; j++) { | |
442 | fptr = | |
443 | analog.data + | |
444 | (j * sizeof(float)); | |
445 | sr_spew("RNGDCW%d j %d %f %p", i, | |
446 | j, *fptr, (void *) fptr); | |
447 | } | |
448 | sr_session_send(sdi, &packet); | |
449 | } | |
450 | g_slist_free(analog.meaning->channels); | |
451 | sr_dbg("Sending A%d ring buffer done ", i); | |
452 | }/*if enabled */ | |
453 | }/* for channels */ | |
454 | return 0; | |
455 | ||
456 | } | |
457 | ||
458 | /* Given a chunk of slices forward to trigger check or session as appropriate and update state | |
459 | these could be real slices or those generated by rles */ | |
460 | int process_group(struct sr_dev_inst *sdi, struct dev_context *devc, | |
461 | uint32_t num_slices) | |
462 | { | |
463 | int trigger_offset; | |
464 | int pre_trigger_samples; | |
465 | /* These are samples sent to session and are less than num_slices if we reach limit_samples */ | |
466 | size_t num_samples; | |
467 | struct sr_datafeed_logic logic; | |
468 | struct sr_datafeed_packet packet; | |
469 | int i; | |
470 | size_t cbuf_wrptr_cpy; | |
471 | cbuf_wrptr_cpy = devc->cbuf_wrptr; | |
472 | /*regardless of whether we forward samples on or not (because we aren't triggered), always reset the | |
473 | pointer into the device data buffers */ | |
474 | devc->cbuf_wrptr = 0; | |
475 | if (devc->trigger_fired) { /*send directly to session */ | |
476 | if (devc->limit_samples && | |
477 | num_slices > | |
478 | devc->limit_samples - devc->sent_samples) { | |
479 | num_samples = | |
480 | devc->limit_samples - devc->sent_samples; | |
481 | } else { | |
482 | num_samples = num_slices; | |
483 | } | |
484 | if (num_samples > 0) { | |
485 | sr_spew("Process_group sending %lu post trig samples dsb %d", | |
486 | num_samples, devc->dig_sample_bytes); | |
487 | if (devc->num_d_channels) { | |
488 | packet.type = SR_DF_LOGIC; | |
489 | packet.payload = &logic; | |
490 | /* The number of bytes required to fit all of the channels */ | |
491 | logic.unitsize = devc->dig_sample_bytes; | |
492 | /* The total length of the array sent */ | |
493 | logic.length = num_samples * logic.unitsize; | |
494 | logic.data = devc->d_data_buf; | |
495 | sr_session_send(sdi, &packet); | |
496 | } | |
497 | send_analog(sdi, devc, num_samples, 0); | |
498 | } | |
499 | ||
500 | devc->sent_samples += num_samples; | |
501 | return 0; | |
502 | ||
503 | } else { | |
504 | /* Trigger_fired */ | |
505 | size_t num_ring_samples; | |
506 | size_t sptr, eptr; | |
507 | size_t numtail, numwrap; | |
508 | size_t srcptr; | |
509 | /* The trigger_offset is -1 if no trigger is found, but if a trigger is | |
510 | * found then trigger_offset is the offset into the data buffer sent to | |
511 | * it. The pre_trigger_samples is the total number of samples before | |
512 | * the trigger, but limited to the size of the ring buffer set by the | |
513 | * capture_ratio. So the pre_trigger_samples can include both the new | |
514 | * samples and the ring buffer, but trigger_offset is only in relation | |
515 | * to the new samples */ | |
516 | trigger_offset = soft_trigger_logic_check(devc->stl, devc->d_data_buf, | |
517 | num_slices * devc->dig_sample_bytes, &pre_trigger_samples); | |
518 | ||
519 | /* A trigger offset >=0 indicates a trigger was seen. The stl will issue | |
520 | * the trigger to the session and will forward all pre trigger logic | |
521 | * samples, but we must send any post trigger logic and all pre and post | |
522 | * trigger analog signals */ | |
523 | if (trigger_offset > -1) { | |
524 | devc->trigger_fired = TRUE; | |
525 | devc->sent_samples += pre_trigger_samples; | |
526 | packet.type = SR_DF_LOGIC; | |
527 | packet.payload = &logic; | |
528 | num_samples = num_slices - trigger_offset; | |
529 | ||
530 | /* Since we are in continuous mode for SW triggers it is possible to | |
531 | * get more samples than limit_samples, so once the trigger fires, | |
532 | * make sure we don't get beyond limit samples. At this point | |
533 | * sent_samples should be equal to pre_trigger_samples (just added | |
534 | * above) because without being triggered we'd never increment | |
535 | * sent_samples. | |
536 | * This number is the number of post trigger logic samples to send | |
537 | * to the session, the number of floats is larger because of the | |
538 | * analog ring buffer we track. */ | |
539 | if (devc->limit_samples && \ | |
540 | (num_samples > devc->limit_samples - devc->sent_samples)) | |
541 | num_samples = devc->limit_samples - devc->sent_samples; | |
542 | ||
543 | /* The soft trigger logic issues the trigger and sends packets for | |
544 | * all logic data that was pretrigger so only send what is left */ | |
545 | if (num_samples > 0) { | |
546 | sr_dbg("Sending post trigger logical remainder of %lu", | |
547 | num_samples); | |
548 | logic.length = num_samples * devc->dig_sample_bytes; | |
549 | logic.unitsize = devc->dig_sample_bytes; | |
550 | logic.data = devc->d_data_buf + | |
551 | (trigger_offset * devc->dig_sample_bytes); | |
552 | devc->sent_samples += num_samples; | |
553 | sr_session_send(sdi, &packet); | |
554 | } | |
555 | ||
556 | size_t new_start, new_end, new_samples, ring_samples; | |
557 | /* Figure out the analog data to send. We might need to send: | |
558 | * -some or all of incoming data | |
559 | * -all of incoming data and some of ring buffer | |
560 | * -all of incoming data and all of ring buffer (and still might be | |
561 | * short) | |
562 | * We don't need to compare to limit_samples because pretrig_entries | |
563 | * can never be more than limit_samples trigger offset indicatese | |
564 | * where in the new samples the trigger was, but we need to go back | |
565 | * pretrig_entries before it */ | |
566 | new_start = (trigger_offset > (int)devc->pretrig_entries) ? | |
567 | trigger_offset - devc->pretrig_entries : 0; | |
568 | ||
569 | /* Note that we might not have gotten all the pre triggerstore data | |
570 | * we were looking for. In such a case the sw trigger logic seems to | |
571 | * fill up to the limit_samples and thus the ratio is off, but we | |
572 | * get the full number of samples. | |
573 | * The number of entries in the ring buffer is | |
574 | * pre_trigger_samples-trigger_offset so subtract that from limit | |
575 | * samples as a threshold */ | |
576 | new_end = MIN(num_slices - 1, | |
577 | devc->limit_samples - (pre_trigger_samples - trigger_offset) - 1); | |
578 | ||
579 | /* This includes pre and post trigger storage. */ | |
580 | new_samples = new_end - new_start + 1; | |
581 | ||
582 | /* pre_trigger_samples can never be greater than trigger_offset by | |
583 | * more than the ring buffer depth (pretrig entries) */ | |
584 | ring_samples = (pre_trigger_samples > trigger_offset) ? | |
585 | pre_trigger_samples - trigger_offset : 0; | |
586 | sr_spew("SW trigger float info newstart %zu new_end %zu " \ | |
587 | "new_samp %zu ring_samp %zu", | |
588 | new_start, new_end, new_samples, ring_samples); | |
589 | ||
590 | if (ring_samples > 0) | |
591 | send_analog_ring(sdi, devc, ring_samples); | |
592 | if (new_samples) | |
593 | send_analog(sdi, devc, new_samples, new_start); | |
594 | } else { | |
595 | /* We didn't trigger but need to copy to ring buffer */ | |
596 | if ((devc->a_chan_mask) && (devc->pretrig_entries)) { | |
597 | /*The incoming data buffer could be much larger than the ring | |
598 | * buffer, so never copy more than the size of the ring buffer */ | |
599 | num_ring_samples = num_slices > devc->pretrig_entries ? | |
600 | devc->pretrig_entries : num_slices; | |
601 | sptr = devc->pretrig_wr_ptr; /* Starting pointer to copy to */ | |
602 | ||
603 | /* endptr can't go past the end */ | |
604 | eptr = (sptr + num_ring_samples) >= devc-> pretrig_entries ? | |
605 | devc->pretrig_entries - 1 : sptr + num_ring_samples - 1; | |
606 | ||
607 | /* Number of samples to copy to the tail of ring buffer without | |
608 | * wrapping */ | |
609 | numtail = (eptr - sptr) + 1; | |
610 | ||
611 | numwrap = (num_ring_samples > numtail) ? | |
612 | num_ring_samples - numtail : 0; | |
613 | ||
614 | /* cbuf_wrptr points to where the next write should go, | |
615 | * not the actual write data */ | |
616 | srcptr = cbuf_wrptr_cpy - num_ring_samples; | |
617 | sr_spew("RNG num %zu sptr %zu eptr %zu ", | |
618 | num_ring_samples, sptr, eptr); | |
619 | ||
620 | /* Copy tail */ | |
621 | for (i = 0; i < devc->num_a_channels; i++) | |
622 | if ((devc->a_chan_mask >> i) & 1) | |
623 | for (uint32_t j = 0; j < numtail; j++) | |
624 | devc->a_pretrig_bufs[i][sptr + j] = | |
625 | devc->a_data_bufs[i][srcptr + j]; | |
626 | ||
627 | /* Copy wrap */ | |
628 | srcptr += numtail; | |
629 | for (i = 0; i < devc->num_a_channels; i++) | |
630 | if ((devc->a_chan_mask >> i) & 1) | |
631 | for (uint32_t j = 0; j < numwrap; j++) | |
632 | devc->a_pretrig_bufs[i][j] = | |
633 | devc->a_data_bufs[i][srcptr + j]; | |
634 | ||
635 | devc->pretrig_wr_ptr = (numwrap) ? | |
636 | numwrap : (eptr + 1) % devc->pretrig_entries; | |
637 | } | |
638 | } | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | /* Duplicate previous sample values | |
645 | * This function relies on the caller to ensure d_data_buf has samples to handle | |
646 | * the full value of the rle */ | |
647 | void rle_memset(struct dev_context *devc, uint32_t num_slices) | |
648 | { | |
649 | uint32_t j, k, didx; | |
650 | sr_spew("rle_memset vals 0x%X, 0x%X, 0x%X slices %d dsb %d", | |
651 | devc->d_last[0], devc->d_last[1], devc->d_last[2], | |
652 | num_slices, devc->dig_sample_bytes); | |
653 | ||
654 | /* Even if a channel is disabled, PV expects the same location and size for | |
655 | * the enabled channels as if the channel were enabled. */ | |
656 | for (j = 0; j < num_slices; j++) { | |
657 | didx = devc->cbuf_wrptr * devc->dig_sample_bytes; | |
658 | for (k = 0; k < devc->dig_sample_bytes; k++) | |
659 | devc->d_data_buf[didx + k] = devc->d_last[k]; | |
660 | /* cbuf_wrptr always counts slices/samples (and not the bytes in the | |
661 | * buffer) regardless of mode */ | |
662 | devc->cbuf_wrptr++; | |
663 | } | |
664 | } | |
665 | ||
666 | /* This callback function is mapped from api.c with serial_source_add and is | |
667 | * created after a capture has been setup and is responsible for querying the | |
668 | * device trigger status, downloading data and forwarding packets */ | |
669 | SR_PRIV int raspberrypi_pico_receive(int fd, int revents, void *cb_data) | |
670 | { | |
671 | struct sr_dev_inst *sdi; | |
672 | struct dev_context *devc; | |
673 | struct sr_serial_dev_inst *serial; | |
674 | int len; | |
675 | uint32_t i, bytes_rem, residual_bytes; | |
676 | (void) fd; | |
677 | ||
678 | if (!(sdi = cb_data)) | |
679 | return TRUE; | |
680 | ||
681 | if (!(devc = sdi->priv)) | |
682 | return TRUE; | |
683 | ||
684 | if (devc->rxstate != RX_ACTIVE) { | |
685 | /* This condition is normal operation and expected to happen | |
686 | * but printed as information */ | |
687 | sr_dbg("Reached non active state in receive %d", devc->rxstate); | |
688 | /* Don't return - we may be waiting for a final bytecnt */ | |
689 | } | |
690 | ||
691 | if (devc->rxstate == RX_IDLE) { | |
692 | /* This is the normal end condition where we do one more receive | |
693 | * to make sure we get the full byte_cnt */ | |
694 | sr_dbg("Reached idle state in receive %d", devc->rxstate); | |
695 | return FALSE; | |
696 | } | |
697 | ||
698 | serial = sdi->conn; | |
699 | ||
700 | /* Return true if it is some kind of event we don't handle */ | |
701 | if (!(revents == G_IO_IN || revents == 0)) | |
702 | return TRUE; | |
703 | ||
704 | /* Fill the buffer, note the end may have partial slices */ | |
705 | bytes_rem = devc->serial_buffer_size - devc->wrptr; | |
706 | ||
707 | /* Read one byte less so that we can null it and print as a string. Do a | |
708 | * small 10ms timeout, if we get nothing, we'll always come back again */ | |
709 | len = serial_read_blocking(serial, &(devc->buffer[devc->wrptr]), | |
710 | bytes_rem - 1, 10); | |
711 | sr_spew("Entry wrptr %u bytes_rem %u len %d", devc->wrptr, bytes_rem, len); | |
712 | ||
713 | if (len > 0) { | |
714 | devc->buffer[devc->wrptr + len] = 0; | |
715 | /* Add the "#" so that spaces in the string are clearly seen */ | |
716 | sr_dbg("rx string %s#", devc->buffer); | |
717 | devc->bytes_avail = (devc->wrptr + len); | |
718 | sr_spew("rx len %d bytes_avail %ul sent_samples %ul wrptr %u", | |
719 | len, devc->bytes_avail, devc->sent_samples, devc->wrptr); | |
720 | } else { | |
721 | if (len == 0) { | |
722 | return TRUE; | |
723 | } else { | |
724 | sr_err("ERROR: Negative serial read code %d", len); | |
725 | sdi->driver->dev_acquisition_stop(sdi); | |
726 | return FALSE; | |
727 | } | |
728 | } | |
729 | ||
730 | /* Process the serial read data */ | |
731 | devc->ser_rdptr = 0; | |
732 | if (devc->rxstate == RX_ACTIVE) { | |
733 | if ((devc->a_chan_mask == 0) \ | |
734 | && ((devc->d_chan_mask & 0xFFFFFFF0) == 0)) | |
735 | process_D4(sdi, devc); | |
736 | else | |
737 | process_slice(sdi, devc); | |
738 | } | |
739 | ||
740 | /* process_slice/process_D4 increment ser_rdptr as bytes of the serial | |
741 | * buffer are used. But they may not use all of it, and thus the residual | |
742 | * unused bytes are shifted to the start of the buffer for the next call. */ | |
743 | residual_bytes = devc->bytes_avail - devc->ser_rdptr; | |
744 | if (residual_bytes) { | |
745 | for (i = 0; i < residual_bytes; i++) | |
746 | devc->buffer[i] = devc->buffer[i + devc->ser_rdptr]; | |
747 | ||
748 | devc->ser_rdptr = 0; | |
749 | devc->wrptr = residual_bytes; | |
750 | sr_spew("Residual shift rdptr %u wrptr %u", devc->ser_rdptr, devc->wrptr); | |
751 | } else { | |
752 | /* If there are no residuals shifted then zero the wrptr since all data | |
753 | * is used */ | |
754 | devc->wrptr = 0; | |
755 | } | |
756 | ||
757 | /* ABORT ends immediately */ | |
758 | if (devc->rxstate == RX_ABORT) { | |
759 | sr_err("Ending receive on abort"); | |
760 | sdi->driver->dev_acquisition_stop(sdi); | |
761 | return FALSE; | |
762 | } | |
763 | ||
764 | /* If stopped, look for final '+' indicating the full byte_cnt is received */ | |
765 | if (devc->rxstate == RX_STOPPED) { | |
766 | sr_dbg("Stopped, checking byte_cnt"); | |
767 | if (devc->buffer[0] != '$') { | |
768 | /* If this happens it means that we got a set of data that was not | |
769 | * processed as whole groups of slice bytes. So either we lost data | |
770 | * or are not parsing it correctly. */ | |
771 | sr_err("ERROR: Stop marker should be byte zero"); | |
772 | devc->rxstate = RX_ABORT; | |
773 | sdi->driver->dev_acquisition_stop(sdi); | |
774 | return FALSE; | |
775 | } | |
776 | ||
777 | for (i = 1; i < devc->wrptr; i++) { | |
778 | if (devc->buffer[i] == '+') { | |
779 | devc->buffer[i] = 0; | |
780 | uint64_t rxbytecnt; | |
781 | rxbytecnt = atol((char*)&(devc->buffer[1])); | |
782 | sr_dbg("Byte_cnt check device cnt %lu host cnt %lu", | |
783 | rxbytecnt, devc->byte_cnt); | |
784 | if (rxbytecnt != devc->byte_cnt) | |
785 | sr_err("ERROR: received %lu and counted %lu bytecnts " \ | |
786 | "don't match, data may be lost", | |
787 | rxbytecnt, devc->byte_cnt); | |
788 | ||
789 | /* Since we got the bytecnt we know the device is done | |
790 | * sending data */ | |
791 | devc->rxstate = RX_IDLE; | |
792 | ||
793 | /* We must always call acquisition_stop on all completed runs */ | |
794 | sdi->driver->dev_acquisition_stop(sdi); | |
795 | return TRUE; | |
796 | } | |
797 | } | |
798 | ||
799 | /*It's possible we need one more serial transfer to get the byte_cnt, | |
800 | * so print that here */ | |
801 | sr_dbg("Haven't seen byte_cnt + yet"); | |
802 | } | |
803 | /* If at the sample limit, send a "+" in case we are in continuous mode and | |
804 | * need to stop the device. Not that even in non continous mode there might | |
805 | * be cases where get an extra sample or two... */ | |
806 | ||
807 | if ((devc->sent_samples >= devc->limit_samples) \ | |
808 | && (devc->rxstate == RX_ACTIVE)) { | |
809 | sr_dbg("Ending: sent %u of limit %lu samples byte_cnt %lu", | |
810 | devc->sent_samples, devc->limit_samples, devc->byte_cnt); | |
811 | send_serial_char(serial, '+'); | |
812 | } | |
813 | ||
814 | sr_spew("Receive function done: sent %u limit %lu wrptr %u len %d", | |
815 | devc->sent_samples, devc->limit_samples, devc->wrptr, len); | |
816 | ||
817 | return TRUE; | |
818 | } | |
819 | ||
820 | /* Read device specific information from the device */ | |
821 | SR_PRIV int raspberrypi_pico_get_dev_cfg(const struct sr_dev_inst *sdi) | |
822 | { | |
823 | struct dev_context *devc; | |
824 | struct sr_serial_dev_inst *serial; | |
825 | char *cmd, response[20]; | |
826 | gchar **tokens; | |
827 | unsigned int i; | |
828 | int ret, num_tokens; | |
829 | ||
830 | devc = sdi->priv; | |
831 | sr_dbg("At get_dev_cfg"); | |
832 | serial = sdi->conn; | |
833 | for (i = 0; i < devc->num_a_channels; i++) { | |
834 | cmd = g_strdup_printf("a%d\n", i); | |
835 | ret = send_serial_w_resp(serial, cmd, response, 20); | |
836 | if (ret <= 0) { | |
837 | sr_err("ERROR: No response from device for analog channel query"); | |
838 | return SR_ERR; | |
839 | } | |
840 | response[ret] = 0; | |
841 | tokens = NULL; | |
842 | tokens = g_strsplit(response, "x", 0); | |
843 | num_tokens = g_strv_length(tokens); | |
844 | ||
845 | if (num_tokens == 2) { | |
846 | devc->a_scale[i] = ((float) atoi(tokens[0])) / 1000000.0; | |
847 | devc->a_offset[i] = ((float) atoi(tokens[1])) / 1000000.0; | |
848 | sr_dbg("A%d scale %f offset %f response #%s# tokens #%s# #%s#", | |
849 | i, devc->a_scale[i], devc->a_offset[i], | |
850 | response, tokens[0], tokens[1]); | |
851 | } else { | |
852 | sr_err("ERROR: Ascale read c%d got unparseable response %s tokens %d", | |
853 | i, response, num_tokens); | |
854 | /* Force a legal fixed value assuming a 3.3V scale */ | |
855 | devc->a_scale[i] = 0.0257; | |
856 | devc->a_offset[i] = 0.0; | |
857 | } | |
858 | ||
859 | g_strfreev(tokens); | |
860 | g_free(cmd); | |
861 | } | |
862 | ||
863 | return SR_OK; | |
864 | } |