2 * This file is part of the sigrok project.
4 * Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de>
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.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libsigrok.h"
24 #include "libsigrok-internal.h"
27 /* Probes are numbered 0-7. */
28 SR_PRIV const char *chronovu_la8_probe_names[NUM_PROBES + 1] = {
29 "0", "1", "2", "3", "4", "5", "6", "7",
33 SR_PRIV void fill_supported_samplerates_if_needed(void)
37 if (chronovu_la8_samplerates[0] != 0)
40 for (i = 0; i < 255; i++)
41 chronovu_la8_samplerates[254 - i] = SR_MHZ(100) / (i + 1);
42 chronovu_la8_samplerates[255] = 0;
46 * Check if the given samplerate is supported by the LA8 hardware.
48 * @param samplerate The samplerate (in Hz) to check.
49 * @return 1 if the samplerate is supported/valid, 0 otherwise.
51 SR_PRIV int is_valid_samplerate(uint64_t samplerate)
55 fill_supported_samplerates_if_needed();
57 for (i = 0; i < 255; i++) {
58 if (chronovu_la8_samplerates[i] == samplerate)
62 sr_err("Invalid samplerate (%" PRIu64 "Hz).", samplerate);
68 * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants.
70 * LA8 hardware: sample period = (divcount + 1) * 10ns.
71 * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate).
72 * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate).
74 * @param samplerate The samplerate in Hz.
75 * @return The divcount value as needed by the hardware, or 0xff upon errors.
77 SR_PRIV uint8_t samplerate_to_divcount(uint64_t samplerate)
79 if (samplerate == 0) {
80 sr_err("%s: samplerate was 0.", __func__);
84 if (!is_valid_samplerate(samplerate)) {
85 sr_err("%s: Can't get divcount, samplerate invalid.", __func__);
89 return (SR_MHZ(100) / samplerate) - 1;
93 * Write data of a certain length to the LA8's FTDI device.
95 * @param devc The struct containing private per-device-instance data. Must not
96 * be NULL. devc->ftdic must not be NULL either.
97 * @param buf The buffer containing the data to write. Must not be NULL.
98 * @param size The number of bytes to write. Must be >= 0.
99 * @return The number of bytes written, or a negative value upon errors.
101 SR_PRIV int la8_write(struct dev_context *devc, uint8_t *buf, int size)
105 /* Note: Caller checked that devc and devc->ftdic != NULL. */
108 sr_err("%s: buf was NULL.", __func__);
113 sr_err("%s: size was < 0.", __func__);
117 bytes_written = ftdi_write_data(devc->ftdic, buf, size);
119 if (bytes_written < 0) {
120 sr_err("%s: ftdi_write_data: (%d) %s.", __func__,
121 bytes_written, ftdi_get_error_string(devc->ftdic));
122 (void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
123 } else if (bytes_written != size) {
124 sr_err("%s: bytes to write: %d, bytes written: %d.",
125 __func__, size, bytes_written);
126 (void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
129 return bytes_written;
133 * Read a certain amount of bytes from the LA8's FTDI device.
135 * @param devc The struct containing private per-device-instance data. Must not
136 * be NULL. devc->ftdic must not be NULL either.
137 * @param buf The buffer where the received data will be stored. Must not
139 * @param size The number of bytes to read. Must be >= 1.
140 * @return The number of bytes read, or a negative value upon errors.
142 SR_PRIV int la8_read(struct dev_context *devc, uint8_t *buf, int size)
146 /* Note: Caller checked that devc and devc->ftdic != NULL. */
149 sr_err("%s: buf was NULL.", __func__);
154 sr_err("%s: size was <= 0.", __func__);
158 bytes_read = ftdi_read_data(devc->ftdic, buf, size);
160 if (bytes_read < 0) {
161 sr_err("%s: ftdi_read_data: (%d) %s.", __func__,
162 bytes_read, ftdi_get_error_string(devc->ftdic));
163 } else if (bytes_read != size) {
164 // sr_err("%s: Bytes to read: %d, bytes read: %d.",
165 // __func__, size, bytes_read);
171 SR_PRIV int la8_close(struct dev_context *devc)
176 sr_err("%s: devc was NULL.", __func__);
181 sr_err("%s: devc->ftdic was NULL.", __func__);
185 if ((ret = ftdi_usb_close(devc->ftdic)) < 0) {
186 sr_err("%s: ftdi_usb_close: (%d) %s.",
187 __func__, ret, ftdi_get_error_string(devc->ftdic));
194 * Close the ChronoVu LA8 USB port and reset the LA8 sequencer logic.
196 * @param devc The struct containing private per-device-instance data.
197 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
199 SR_PRIV int la8_close_usb_reset_sequencer(struct dev_context *devc)
201 /* Magic sequence of bytes for resetting the LA8 sequencer logic. */
202 uint8_t buf[8] = {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01};
206 sr_err("%s: devc was NULL.", __func__);
211 sr_err("%s: devc->ftdic was NULL.", __func__);
215 if (devc->ftdic->usb_dev) {
216 /* Reset the LA8 sequencer logic, then wait 100ms. */
217 sr_dbg("Resetting sequencer logic.");
218 (void) la8_write(devc, buf, 8); /* Ignore errors. */
219 g_usleep(100 * 1000);
221 /* Purge FTDI buffers, then reset and close the FTDI device. */
222 sr_dbg("Purging buffers, resetting+closing FTDI device.");
224 /* Log errors, but ignore them (i.e., don't abort). */
225 if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0)
226 sr_err("%s: ftdi_usb_purge_buffers: (%d) %s.",
227 __func__, ret, ftdi_get_error_string(devc->ftdic));
228 if ((ret = ftdi_usb_reset(devc->ftdic)) < 0)
229 sr_err("%s: ftdi_usb_reset: (%d) %s.", __func__,
230 ret, ftdi_get_error_string(devc->ftdic));
231 if ((ret = ftdi_usb_close(devc->ftdic)) < 0)
232 sr_err("%s: ftdi_usb_close: (%d) %s.", __func__,
233 ret, ftdi_get_error_string(devc->ftdic));
236 /* Close USB device, deinitialize and free the FTDI context. */
237 ftdi_free(devc->ftdic); /* Returns void. */
244 * Reset the ChronoVu LA8.
246 * The LA8 must be reset after a failed read/write operation or upon timeouts.
248 * @param devc The struct containing private per-device-instance data.
249 * @return SR_OK upon success, SR_ERR upon failure.
251 SR_PRIV int la8_reset(struct dev_context *devc)
258 sr_err("%s: devc was NULL.", __func__);
263 sr_err("%s: devc->ftdic was NULL.", __func__);
267 sr_dbg("Resetting the device.");
270 * Purge pending read data from the FTDI hardware FIFO until
271 * no more data is left, or a timeout occurs (after 20s).
273 done = 20 + time(NULL);
275 /* TODO: Ignore errors? Check for < 0 at least! */
276 bytes_read = la8_read(devc, (uint8_t *)&buf, BS);
278 } while ((done > now) && (bytes_read > 0));
280 /* Reset the LA8 sequencer logic and close the USB port. */
281 (void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
283 sr_dbg("Device reset finished.");
288 SR_PRIV int configure_probes(const struct sr_dev_inst *sdi)
290 struct dev_context *devc;
291 const struct sr_probe *probe;
297 devc->trigger_pattern = 0;
298 devc->trigger_mask = 0; /* Default to "don't care" for all probes. */
300 for (l = sdi->probes; l; l = l->next) {
301 probe = (struct sr_probe *)l->data;
304 sr_err("%s: probe was NULL.", __func__);
308 /* Skip disabled probes. */
312 /* Skip (enabled) probes with no configured trigger. */
316 /* Note: Must only be run if probe->trigger != NULL. */
317 if (probe->index < 0 || probe->index > 7) {
318 sr_err("%s: Invalid probe index %d, must be "
319 "between 0 and 7.", __func__, probe->index);
323 probe_bit = (1 << (probe->index));
325 /* Configure the probe's trigger mask and trigger pattern. */
326 for (tc = probe->trigger; tc && *tc; tc++) {
327 devc->trigger_mask |= probe_bit;
329 /* Sanity check, LA8 only supports low/high trigger. */
330 if (*tc != '0' && *tc != '1') {
331 sr_err("%s: Invalid trigger '%c', only "
332 "'0'/'1' supported.", __func__, *tc);
337 devc->trigger_pattern |= probe_bit;
341 sr_dbg("Trigger mask = 0x%x, trigger pattern = 0x%x.",
342 devc->trigger_mask, devc->trigger_pattern);
347 SR_PRIV int set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate)
349 struct dev_context *devc;
351 /* Note: Caller checked that sdi and sdi->priv != NULL. */
355 sr_spew("Trying to set samplerate to %" PRIu64 "Hz.", samplerate);
357 fill_supported_samplerates_if_needed();
359 /* Check if this is a samplerate supported by the hardware. */
360 if (!is_valid_samplerate(samplerate))
363 /* Set the new samplerate. */
364 devc->cur_samplerate = samplerate;
366 sr_dbg("Samplerate set to %" PRIu64 "Hz.", devc->cur_samplerate);
372 * Get a block of data from the LA8.
374 * @param devc The struct containing private per-device-instance data. Must not
375 * be NULL. devc->ftdic must not be NULL either.
376 * @return SR_OK upon success, or SR_ERR upon errors.
378 SR_PRIV int la8_read_block(struct dev_context *devc)
380 int i, byte_offset, m, mi, p, index, bytes_read;
383 /* Note: Caller checked that devc and devc->ftdic != NULL. */
385 sr_spew("Reading block %d.", devc->block_counter);
387 bytes_read = la8_read(devc, devc->mangled_buf, BS);
389 /* If first block read got 0 bytes, retry until success or timeout. */
390 if ((bytes_read == 0) && (devc->block_counter == 0)) {
392 sr_spew("Reading block 0 (again).");
393 bytes_read = la8_read(devc, devc->mangled_buf, BS);
394 /* TODO: How to handle read errors here? */
396 } while ((devc->done > now) && (bytes_read == 0));
399 /* Check if block read was successful or a timeout occured. */
400 if (bytes_read != BS) {
401 sr_err("Trigger timed out. Bytes read: %d.", bytes_read);
402 (void) la8_reset(devc); /* Ignore errors. */
406 /* De-mangle the data. */
407 sr_spew("Demangling block %d.", devc->block_counter);
408 byte_offset = devc->block_counter * BS;
409 m = byte_offset / (1024 * 1024);
410 mi = m * (1024 * 1024);
411 for (i = 0; i < BS; i++) {
413 index = m * 2 + (((byte_offset + i) - mi) / 2) * 16;
414 index += (devc->divcount == 0) ? p : (1 - p);
415 devc->final_buf[index] = devc->mangled_buf[i];
421 SR_PRIV void send_block_to_session_bus(struct dev_context *devc, int block)
424 uint8_t sample, expected_sample;
425 struct sr_datafeed_packet packet;
426 struct sr_datafeed_logic logic;
427 int trigger_point; /* Relative trigger point (in this block). */
429 /* Note: No sanity checks on devc/block, caller is responsible. */
431 /* Check if we can find the trigger condition in this block. */
433 expected_sample = devc->trigger_pattern & devc->trigger_mask;
434 for (i = 0; i < BS; i++) {
435 /* Don't continue if the trigger was found previously. */
436 if (devc->trigger_found)
440 * Also, don't continue if triggers are "don't care", i.e. if
441 * no trigger conditions were specified by the user. In that
442 * case we don't want to send an SR_DF_TRIGGER packet at all.
444 if (devc->trigger_mask == 0x00)
447 sample = *(devc->final_buf + (block * BS) + i);
449 if ((sample & devc->trigger_mask) == expected_sample) {
451 devc->trigger_found = 1;
456 /* If no trigger was found, send one SR_DF_LOGIC packet. */
457 if (trigger_point == -1) {
458 /* Send an SR_DF_LOGIC packet to the session bus. */
459 sr_spew("Sending SR_DF_LOGIC packet (%d bytes) for "
460 "block %d.", BS, block);
461 packet.type = SR_DF_LOGIC;
462 packet.payload = &logic;
465 logic.data = devc->final_buf + (block * BS);
466 sr_session_send(devc->cb_data, &packet);
471 * We found the trigger, so some special handling is needed. We have
472 * to send an SR_DF_LOGIC packet with the samples before the trigger
473 * (if any), then the SD_DF_TRIGGER packet itself, then another
474 * SR_DF_LOGIC packet with the samples after the trigger (if any).
477 /* TODO: Send SR_DF_TRIGGER packet before or after the actual sample? */
479 /* If at least one sample is located before the trigger... */
480 if (trigger_point > 0) {
481 /* Send pre-trigger SR_DF_LOGIC packet to the session bus. */
482 sr_spew("Sending pre-trigger SR_DF_LOGIC packet, "
483 "start = %d, length = %d.", block * BS, trigger_point);
484 packet.type = SR_DF_LOGIC;
485 packet.payload = &logic;
486 logic.length = trigger_point;
488 logic.data = devc->final_buf + (block * BS);
489 sr_session_send(devc->cb_data, &packet);
492 /* Send the SR_DF_TRIGGER packet to the session bus. */
493 sr_spew("Sending SR_DF_TRIGGER packet, sample = %d.",
494 (block * BS) + trigger_point);
495 packet.type = SR_DF_TRIGGER;
496 packet.payload = NULL;
497 sr_session_send(devc->cb_data, &packet);
499 /* If at least one sample is located after the trigger... */
500 if (trigger_point < (BS - 1)) {
501 /* Send post-trigger SR_DF_LOGIC packet to the session bus. */
502 sr_spew("Sending post-trigger SR_DF_LOGIC packet, "
503 "start = %d, length = %d.",
504 (block * BS) + trigger_point, BS - trigger_point);
505 packet.type = SR_DF_LOGIC;
506 packet.payload = &logic;
507 logic.length = BS - trigger_point;
509 logic.data = devc->final_buf + (block * BS) + trigger_point;
510 sr_session_send(devc->cb_data, &packet);