]>
Commit | Line | Data |
---|---|---|
744e43bc VP |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
fcc65337 | 4 | * Copyright 2017 Google, Inc |
744e43bc VP |
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 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | #include <stdint.h> | |
22 | #include <string.h> | |
23 | #include <libusb.h> | |
24 | #include <stdio.h> | |
25 | #include <errno.h> | |
26 | #include <math.h> | |
27 | #include <libsigrok/libsigrok.h> | |
28 | #include "libsigrok-internal.h" | |
29 | #include "protocol.h" | |
30 | ||
fcc65337 VP |
31 | /* 'twinkie vbus' command output format */ |
32 | #define VBUS_FORMAT "VBUS = %d mV ; %d mA" | |
33 | ||
744e43bc VP |
34 | SR_PRIV int twinkie_start_acquisition(const struct sr_dev_inst *sdi) |
35 | { | |
fcc65337 VP |
36 | struct dev_context *devc = sdi->priv; |
37 | struct timespec tsample; | |
38 | ||
39 | clock_gettime(CLOCK_REALTIME, &tsample); | |
40 | devc->vbus_t0 = tsample.tv_nsec + (uint64_t)tsample.tv_sec *1000000000ULL; | |
744e43bc VP |
41 | |
42 | return SR_OK; | |
43 | } | |
44 | ||
45 | SR_PRIV int twinkie_init_device(const struct sr_dev_inst *sdi) | |
46 | { | |
47 | (void)sdi; | |
48 | ||
49 | return SR_OK; | |
50 | } | |
51 | ||
52 | static void finish_acquisition(struct sr_dev_inst *sdi) | |
53 | { | |
54 | struct sr_datafeed_packet packet; | |
55 | struct dev_context *devc = sdi->priv; | |
56 | ||
57 | /* Terminate session. */ | |
58 | packet.type = SR_DF_END; | |
59 | sr_session_send(sdi, &packet); | |
60 | ||
61 | /* Remove fds from polling. */ | |
62 | usb_source_remove(sdi->session, devc->ctx); | |
63 | ||
64 | devc->num_transfers = 0; | |
65 | g_free(devc->transfers); | |
66 | g_free(devc->convbuffer); | |
67 | } | |
68 | ||
69 | static void free_transfer(struct libusb_transfer *transfer) | |
70 | { | |
71 | struct sr_dev_inst *sdi; | |
72 | struct dev_context *devc; | |
73 | unsigned int i; | |
74 | ||
75 | sdi = transfer->user_data; | |
76 | devc = sdi->priv; | |
77 | ||
78 | g_free(transfer->buffer); | |
79 | transfer->buffer = NULL; | |
80 | libusb_free_transfer(transfer); | |
81 | ||
82 | for (i = 0; i < devc->num_transfers; i++) { | |
83 | if (devc->transfers[i] == transfer) { | |
84 | devc->transfers[i] = NULL; | |
85 | break; | |
86 | } | |
87 | } | |
88 | ||
89 | devc->submitted_transfers--; | |
90 | if (devc->submitted_transfers == 0) | |
91 | finish_acquisition(sdi); | |
92 | } | |
93 | ||
94 | static void export_samples(const struct sr_dev_inst *sdi, size_t cnt) | |
95 | { | |
96 | struct sr_datafeed_packet packet; | |
97 | struct sr_datafeed_logic logic; | |
98 | struct dev_context *devc = sdi->priv; | |
99 | ||
100 | /* export the received data */ | |
101 | packet.type = SR_DF_LOGIC; | |
102 | packet.payload = &logic; | |
103 | if (devc->limit_samples && | |
104 | cnt > devc->limit_samples - devc->sent_samples) | |
105 | cnt = devc->limit_samples - devc->sent_samples; | |
106 | logic.length = cnt; | |
107 | logic.unitsize = 1; | |
108 | logic.data = devc->convbuffer; | |
109 | sr_session_send(sdi, &packet); | |
110 | devc->sent_samples += cnt; | |
111 | } | |
112 | ||
113 | static void expand_sample_data(const struct sr_dev_inst *sdi, | |
114 | const uint8_t *src, size_t srccnt) | |
115 | { | |
116 | struct dev_context *devc = sdi->priv; | |
117 | int i, f; | |
118 | size_t b; | |
119 | size_t rdy_samples, left_samples; | |
120 | int frames = srccnt / 64; | |
121 | ||
122 | for (f = 0; f < frames; f++) { | |
123 | int ch = (src[1] >> 4) & 3; /* samples channel number */ | |
124 | int bit = 1 << ch; /* channel bit mask */ | |
125 | struct cc_context *cc = devc->cc + ch; | |
126 | uint8_t *dest = devc->convbuffer + cc->idx; | |
127 | ||
128 | if (ch >= 2) /* only acquires CCx channels */ | |
129 | continue; | |
130 | ||
131 | /* TODO: check timestamp, overflow, sequence number */ | |
132 | ||
133 | /* skip header, go to edges data */ | |
134 | src+=4; | |
135 | for (i = 0; i < 60; i++,src++) | |
136 | if (*src == cc->prev_src) { | |
137 | cc->rollbacks++; | |
138 | } else { | |
139 | uint8_t diff = *src - cc->prev_src; | |
140 | int fixup = cc->rollbacks && (((int)*src < (int)cc->prev_src) || (*src == 0xff)); | |
141 | size_t total = (fixup ? cc->rollbacks - 1 : cc->rollbacks) * 256 + diff; | |
142 | ||
143 | if (total + cc->idx > devc->convbuffer_size) { | |
144 | sr_warn("overflow %d+%zd/%zd\n", | |
145 | cc->idx, total, | |
146 | devc->convbuffer_size); | |
147 | /* reset current decoding */ | |
148 | cc->rollbacks = 0; | |
149 | break; | |
150 | } | |
151 | ||
152 | /* insert bits in the buffer */ | |
153 | if (cc->level) | |
154 | for (b = 0 ; b < total ; b++, dest++) | |
155 | *dest |= bit; | |
156 | else | |
157 | dest += total; | |
158 | cc->idx += total; | |
159 | ||
160 | /* flip level on the next edge */ | |
161 | cc->level = ~cc->level; | |
162 | ||
163 | cc->rollbacks = 0; | |
164 | cc->prev_src = *src; | |
165 | } | |
166 | /* expand repeated rollbacks */ | |
167 | if (cc->rollbacks > 1) { | |
168 | size_t total = 256 * (cc->rollbacks - 1); | |
169 | if (total + cc->idx > devc->convbuffer_size) { | |
170 | sr_warn("overflow %d+%zd/%zd\n", | |
171 | cc->idx, total, devc->convbuffer_size); | |
172 | /* reset current decoding */ | |
173 | total = 0; | |
174 | } | |
175 | /* insert bits in the buffer */ | |
176 | if (cc->level) | |
177 | for (b = 0 ; b < total ; b++, dest++) | |
178 | *dest |= bit ; | |
179 | cc->idx += total; | |
180 | cc->rollbacks = 1; | |
181 | } | |
182 | } | |
183 | ||
184 | /* samples ready to be pushed (with both channels) */ | |
185 | rdy_samples = MIN(devc->cc[0].idx, devc->cc[1].idx); | |
186 | left_samples = MAX(devc->cc[0].idx, devc->cc[1].idx) - rdy_samples; | |
187 | /* skip empty transfer */ | |
188 | if (rdy_samples == 0) | |
189 | return; | |
190 | ||
191 | export_samples(sdi, rdy_samples); | |
192 | ||
193 | /* clean up what we have sent */ | |
194 | memmove(devc->convbuffer, devc->convbuffer + rdy_samples, left_samples); | |
195 | memset(devc->convbuffer + left_samples, 0, rdy_samples); | |
196 | devc->cc[0].idx -= rdy_samples; | |
197 | devc->cc[1].idx -= rdy_samples; | |
198 | } | |
199 | ||
200 | SR_PRIV void LIBUSB_CALL twinkie_receive_transfer(struct libusb_transfer *transfer) | |
201 | { | |
202 | gboolean packet_has_error = FALSE; | |
203 | struct sr_dev_inst *sdi; | |
204 | struct dev_context *devc; | |
205 | ||
206 | sdi = transfer->user_data; | |
207 | devc = sdi->priv; | |
208 | ||
209 | /* | |
210 | * If acquisition has already ended, just free any queued up | |
211 | * transfer that come in. | |
212 | */ | |
213 | if (devc->sent_samples < 0) { | |
214 | free_transfer(transfer); | |
215 | return; | |
216 | } | |
217 | ||
218 | if (transfer->status || transfer->actual_length) | |
219 | sr_info("receive_transfer(): status %d received %d bytes.", | |
220 | transfer->status, transfer->actual_length); | |
221 | ||
222 | switch (transfer->status) { | |
223 | case LIBUSB_TRANSFER_NO_DEVICE: | |
224 | devc->sent_samples = -2; | |
225 | free_transfer(transfer); | |
226 | return; | |
227 | case LIBUSB_TRANSFER_COMPLETED: | |
228 | case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */ | |
229 | break; | |
230 | default: | |
231 | packet_has_error = TRUE; | |
232 | break; | |
233 | } | |
234 | ||
235 | if (transfer->actual_length % 64) { | |
236 | sr_err("Bad USB packet size."); | |
237 | packet_has_error = TRUE; | |
238 | } | |
239 | ||
240 | if (transfer->actual_length == 0 || packet_has_error) | |
241 | goto resubmit; | |
242 | ||
243 | /* decode received edges */ | |
244 | expand_sample_data(sdi, transfer->buffer, transfer->actual_length); | |
245 | ||
246 | if (devc->limit_samples && | |
247 | (uint64_t)devc->sent_samples >= devc->limit_samples) { | |
248 | devc->sent_samples = -2; | |
249 | free_transfer(transfer); | |
250 | return; | |
251 | } | |
252 | resubmit: | |
253 | if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS) | |
254 | free_transfer(transfer); | |
255 | } | |
fcc65337 VP |
256 | |
257 | static void export_vbus(const struct sr_dev_inst *sdi, int mv, int ma) | |
258 | { | |
259 | static float tmp_data[VBUS_GRP_COUNT][32768]; | |
260 | struct dev_context *devc = sdi->priv; | |
261 | struct sr_datafeed_packet packet[VBUS_GRP_COUNT]; | |
262 | uint64_t tlen = devc->vbus_delta * 24 / 10000; | |
263 | uint64_t len = MIN(32768, tlen); | |
264 | unsigned i; | |
265 | int g; | |
266 | ||
267 | for (g = 0; g < devc->vbus_channels; g++) { | |
268 | float val = g == VBUS_V ? mv/1000.0 : ma/1000.0; | |
269 | packet[g].type = SR_DF_ANALOG; | |
270 | packet[g].payload = &devc->vbus_packet[g]; | |
271 | devc->vbus_packet[g].data = tmp_data[g]; | |
272 | for (i = 0; i < len; i++) | |
273 | tmp_data[g][i] = val; | |
274 | } | |
275 | ||
276 | do { | |
277 | for (g = 0; g < devc->vbus_channels; g++) { | |
278 | devc->vbus_packet[g].num_samples = len; | |
279 | sr_session_send(sdi, &packet[g]); | |
280 | } | |
281 | tlen -= len; | |
282 | len = MIN(32768, tlen); | |
283 | } while (tlen); | |
284 | } | |
285 | ||
286 | SR_PRIV void LIBUSB_CALL twinkie_vbus_sent(struct libusb_transfer *transfer) | |
287 | { | |
288 | struct sr_dev_inst *sdi = transfer->user_data; | |
289 | struct dev_context *devc = sdi->priv; | |
290 | struct libusb_transfer *in_xfer = devc->transfers[11]; | |
291 | struct timespec tsample; | |
292 | uint64_t now; | |
293 | ||
294 | /* acquisition has already ended */ | |
295 | if (devc->sent_samples < 0 || transfer->status == LIBUSB_TRANSFER_NO_DEVICE) | |
296 | goto abort_vbus; | |
297 | ||
298 | if (transfer->status != LIBUSB_TRANSFER_COMPLETED) | |
299 | goto abort_vbus; | |
300 | ||
301 | clock_gettime(CLOCK_REALTIME, &tsample); | |
302 | now = tsample.tv_nsec + (uint64_t)tsample.tv_sec *1000000000ULL; | |
303 | devc->vbus_delta = now - devc->vbus_t0; | |
304 | devc->vbus_t0 = now; | |
305 | if (libusb_submit_transfer(in_xfer) != LIBUSB_SUCCESS) | |
306 | goto abort_vbus; | |
307 | ||
308 | return; | |
309 | abort_vbus: | |
310 | libusb_free_transfer(transfer); | |
311 | libusb_free_transfer(in_xfer); | |
312 | devc->transfers[10] = NULL; | |
313 | devc->transfers[11] = NULL; | |
314 | devc->submitted_transfers--; | |
315 | if (devc->submitted_transfers == 0) | |
316 | finish_acquisition(sdi); | |
317 | } | |
318 | ||
319 | SR_PRIV void LIBUSB_CALL twinkie_vbus_recv(struct libusb_transfer *transfer) | |
320 | { | |
321 | struct sr_dev_inst *sdi = transfer->user_data; | |
322 | struct dev_context *devc = sdi->priv; | |
323 | struct libusb_transfer *out_xfer = devc->transfers[10]; | |
324 | ||
325 | /* acquisition has already ended */ | |
326 | if (devc->sent_samples < 0 || transfer->status == LIBUSB_TRANSFER_NO_DEVICE) | |
327 | goto abort_vbus; | |
328 | ||
329 | if (transfer->status == LIBUSB_TRANSFER_COMPLETED && | |
330 | transfer->actual_length) { | |
331 | int vbus_ma, vbus_mv; | |
332 | int len = transfer->actual_length; | |
333 | if (len > 63) | |
334 | len = 63; | |
335 | devc->vbus_data[len] = 0; | |
336 | if (sscanf(devc->vbus_data, VBUS_FORMAT, &vbus_mv, &vbus_ma) == 2) { | |
337 | export_vbus(sdi, vbus_mv, vbus_ma); | |
338 | } | |
339 | } | |
340 | ||
341 | if (libusb_submit_transfer(out_xfer) != LIBUSB_SUCCESS) | |
342 | goto abort_vbus; | |
343 | ||
344 | return; | |
345 | abort_vbus: | |
346 | libusb_free_transfer(transfer); | |
347 | libusb_free_transfer(out_xfer); | |
348 | devc->transfers[10] = NULL; | |
349 | devc->transfers[11] = NULL; | |
350 | devc->submitted_transfers--; | |
351 | if (devc->submitted_transfers == 0) | |
352 | finish_acquisition(sdi); | |
353 | } |