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
26 #include "sigrok-internal.h"
28 #define USB_VENDOR_ID 0x0403
29 #define USB_PRODUCT_ID 0x6001
30 #define USB_DESCRIPTION "ChronoVu LA8"
31 #define USB_VENDOR_NAME "ChronoVu"
32 #define USB_MODEL_NAME "LA8"
33 #define USB_MODEL_VERSION ""
36 #define TRIGGER_TYPES "01"
37 #define SDRAM_SIZE (8 * 1024 * 1024)
38 #define MIN_NUM_SAMPLES 1
40 #define BS 4096 /* Block size */
41 #define NUM_BLOCKS 2048 /* Number of blocks */
43 static GSList *dev_insts = NULL;
45 static const char *probe_names[NUM_PROBES + 1] = {
57 /* Private, per-device-instance driver context. */
59 /** FTDI device context (used by libftdi). */
60 struct ftdi_context *ftdic;
62 /** The currently configured samplerate of the device. */
63 uint64_t cur_samplerate;
65 /** The current sampling limit (in ms). */
68 /** The current sampling limit (in number of samples). */
69 uint64_t limit_samples;
75 * A buffer containing some (mangled) samples from the device.
76 * Format: Pretty mangled-up (due to hardware reasons), see code.
78 uint8_t mangled_buf[BS];
81 * An 8MB buffer where we'll store the de-mangled samples.
82 * Format: Each sample is 1 byte, MSB is channel 7, LSB is channel 0.
87 * Trigger pattern (MSB = channel 7, LSB = channel 0).
88 * A 1 bit matches a high signal, 0 matches a low signal on a probe.
89 * Only low/high triggers (but not e.g. rising/falling) are supported.
91 uint8_t trigger_pattern;
94 * Trigger mask (MSB = channel 7, LSB = channel 0).
95 * A 1 bit means "must match trigger_pattern", 0 means "don't care".
99 /** Time (in seconds) before the trigger times out. */
100 uint64_t trigger_timeout;
102 /** Tells us whether an SR_DF_TRIGGER packet was already sent. */
108 /** Counter/index for the data block to be read. */
111 /** The divcount value (determines the sample period) for the LA8. */
115 /* This will be initialized via hw_dev_info_get()/SR_DI_SAMPLERATES. */
116 static uint64_t supported_samplerates[255 + 1] = { 0 };
119 * Min: 1 sample per 0.01us -> sample time is 0.084s, samplerate 100MHz
120 * Max: 1 sample per 2.55us -> sample time is 21.391s, samplerate 392.15kHz
122 static struct sr_samplerates samplerates = {
126 .list = supported_samplerates,
129 /* Note: Continuous sampling is not supported by the hardware. */
130 static int hwcaps[] = {
131 SR_HWCAP_LOGIC_ANALYZER,
133 SR_HWCAP_LIMIT_MSEC, /* TODO: Not yet implemented. */
134 SR_HWCAP_LIMIT_SAMPLES, /* TODO: Not yet implemented. */
138 /* Function prototypes. */
139 static int la8_close_usb_reset_sequencer(struct context *ctx);
140 static int hw_dev_acquisition_stop(int dev_index, gpointer session_data);
141 static int la8_reset(struct context *ctx);
143 static void fill_supported_samplerates_if_needed(void)
147 /* Do nothing if supported_samplerates[] is already filled. */
148 if (supported_samplerates[0] != 0)
151 /* Fill supported_samplerates[] with the proper values. */
152 for (i = 0; i < 255; i++)
153 supported_samplerates[254 - i] = SR_MHZ(100) / (i + 1);
154 supported_samplerates[255] = 0;
158 * Check if the given samplerate is supported by the LA8 hardware.
160 * @param samplerate The samplerate (in Hz) to check.
161 * @return 1 if the samplerate is supported/valid, 0 otherwise.
163 static int is_valid_samplerate(uint64_t samplerate)
167 fill_supported_samplerates_if_needed();
169 for (i = 0; i < 255; i++) {
170 if (supported_samplerates[i] == samplerate)
174 sr_err("la8: %s: invalid samplerate (%" PRIu64 "Hz)",
175 __func__, samplerate);
181 * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants.
183 * LA8 hardware: sample period = (divcount + 1) * 10ns.
184 * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate).
185 * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate).
187 * @param samplerate The samplerate in Hz.
188 * @return The divcount value as needed by the hardware, or 0xff upon errors.
190 static uint8_t samplerate_to_divcount(uint64_t samplerate)
192 if (samplerate == 0) {
193 sr_err("la8: %s: samplerate was 0", __func__);
197 if (!is_valid_samplerate(samplerate)) {
198 sr_err("la8: %s: can't get divcount, samplerate invalid",
203 return (SR_MHZ(100) / samplerate) - 1;
207 * Write data of a certain length to the LA8's FTDI device.
209 * @param ctx The struct containing private per-device-instance data. Must not
210 * be NULL. ctx->ftdic must not be NULL either.
211 * @param buf The buffer containing the data to write. Must not be NULL.
212 * @param size The number of bytes to write. Must be >= 0.
213 * @return The number of bytes written, or a negative value upon errors.
215 static int la8_write(struct context *ctx, uint8_t *buf, int size)
219 /* Note: Caller checked that ctx and ctx->ftdic != NULL. */
222 sr_err("la8: %s: buf was NULL", __func__);
227 sr_err("la8: %s: size was < 0", __func__);
231 bytes_written = ftdi_write_data(ctx->ftdic, buf, size);
233 if (bytes_written < 0) {
234 sr_err("la8: %s: ftdi_write_data: (%d) %s", __func__,
235 bytes_written, ftdi_get_error_string(ctx->ftdic));
236 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
237 } else if (bytes_written != size) {
238 sr_err("la8: %s: bytes to write: %d, bytes written: %d",
239 __func__, size, bytes_written);
240 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
243 return bytes_written;
247 * Read a certain amount of bytes from the LA8's FTDI device.
249 * @param ctx The struct containing private per-device-instance data. Must not
250 * be NULL. ctx->ftdic must not be NULL either.
251 * @param buf The buffer where the received data will be stored. Must not
253 * @param size The number of bytes to read. Must be >= 1.
254 * @return The number of bytes read, or a negative value upon errors.
256 static int la8_read(struct context *ctx, uint8_t *buf, int size)
260 /* Note: Caller checked that ctx and ctx->ftdic != NULL. */
263 sr_err("la8: %s: buf was NULL", __func__);
268 sr_err("la8: %s: size was <= 0", __func__);
272 bytes_read = ftdi_read_data(ctx->ftdic, buf, size);
274 if (bytes_read < 0) {
275 sr_err("la8: %s: ftdi_read_data: (%d) %s", __func__,
276 bytes_read, ftdi_get_error_string(ctx->ftdic));
277 } else if (bytes_read != size) {
278 // sr_err("la8: %s: bytes to read: %d, bytes read: %d",
279 // __func__, size, bytes_read);
285 static int la8_close(struct context *ctx)
290 sr_err("la8: %s: ctx was NULL", __func__);
295 sr_err("la8: %s: ctx->ftdic was NULL", __func__);
299 if ((ret = ftdi_usb_close(ctx->ftdic)) < 0) {
300 sr_err("la8: %s: ftdi_usb_close: (%d) %s",
301 __func__, ret, ftdi_get_error_string(ctx->ftdic));
308 * Close the ChronoVu LA8 USB port and reset the LA8 sequencer logic.
310 * @param ctx The struct containing private per-device-instance data.
311 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
313 static int la8_close_usb_reset_sequencer(struct context *ctx)
315 /* Magic sequence of bytes for resetting the LA8 sequencer logic. */
316 uint8_t buf[8] = {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01};
320 sr_err("la8: %s: ctx was NULL", __func__);
325 sr_err("la8: %s: ctx->ftdic was NULL", __func__);
329 if (ctx->ftdic->usb_dev) {
330 /* Reset the LA8 sequencer logic, then wait 100ms. */
331 sr_dbg("la8: Resetting sequencer logic.");
332 (void) la8_write(ctx, buf, 8); /* Ignore errors. */
333 g_usleep(100 * 1000);
335 /* Purge FTDI buffers, then reset and close the FTDI device. */
336 sr_dbg("la8: Purging buffers, resetting+closing FTDI device.");
338 /* Log errors, but ignore them (i.e., don't abort). */
339 if ((ret = ftdi_usb_purge_buffers(ctx->ftdic)) < 0)
340 sr_err("la8: %s: ftdi_usb_purge_buffers: (%d) %s",
341 __func__, ret, ftdi_get_error_string(ctx->ftdic));
342 if ((ret = ftdi_usb_reset(ctx->ftdic)) < 0)
343 sr_err("la8: %s: ftdi_usb_reset: (%d) %s", __func__,
344 ret, ftdi_get_error_string(ctx->ftdic));
345 if ((ret = ftdi_usb_close(ctx->ftdic)) < 0)
346 sr_err("la8: %s: ftdi_usb_close: (%d) %s", __func__,
347 ret, ftdi_get_error_string(ctx->ftdic));
350 /* Close USB device, deinitialize and free the FTDI context. */
351 ftdi_free(ctx->ftdic); /* Returns void. */
358 * Reset the ChronoVu LA8.
360 * The LA8 must be reset after a failed read/write operation or upon timeouts.
362 * @param ctx The struct containing private per-device-instance data.
363 * @return SR_OK upon success, SR_ERR upon failure.
365 static int la8_reset(struct context *ctx)
372 sr_err("la8: %s: ctx was NULL", __func__);
377 sr_err("la8: %s: ctx->ftdic was NULL", __func__);
381 sr_dbg("la8: Resetting the device.");
384 * Purge pending read data from the FTDI hardware FIFO until
385 * no more data is left, or a timeout occurs (after 20s).
387 done = 20 + time(NULL);
389 /* TODO: Ignore errors? Check for < 0 at least! */
390 bytes_read = la8_read(ctx, (uint8_t *)&buf, BS);
392 } while ((done > now) && (bytes_read > 0));
394 /* Reset the LA8 sequencer logic and close the USB port. */
395 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
397 sr_dbg("la8: Device reset finished.");
402 static int configure_probes(struct context *ctx, GSList *probes)
404 struct sr_probe *probe;
409 /* Note: Caller checked that ctx != NULL. */
411 ctx->trigger_pattern = 0;
412 ctx->trigger_mask = 0; /* Default to "don't care" for all probes. */
414 for (l = probes; l; l = l->next) {
415 probe = (struct sr_probe *)l->data;
418 sr_err("la8: %s: probe was NULL", __func__);
422 /* Skip disabled probes. */
426 /* Skip (enabled) probes with no configured trigger. */
430 /* Note: Must only be run if probe->trigger != NULL. */
431 if (probe->index < 0 || probe->index > 7) {
432 sr_err("la8: %s: invalid probe index %d, must be "
433 "between 0 and 7", __func__, probe->index);
437 probe_bit = (1 << (probe->index - 1));
439 /* Configure the probe's trigger mask and trigger pattern. */
440 for (tc = probe->trigger; tc && *tc; tc++) {
441 ctx->trigger_mask |= probe_bit;
443 /* Sanity check, LA8 only supports low/high trigger. */
444 if (*tc != '0' && *tc != '1') {
445 sr_err("la8: %s: invalid trigger '%c', only "
446 "'0'/'1' supported", __func__, *tc);
451 ctx->trigger_pattern |= probe_bit;
455 sr_dbg("la8: trigger_mask = 0x%x, trigger_pattern = 0x%x",
456 ctx->trigger_mask, ctx->trigger_pattern);
461 static int hw_init(const char *devinfo)
464 struct sr_dev_inst *sdi;
467 /* Avoid compiler errors. */
470 /* Allocate memory for our private driver context. */
471 if (!(ctx = g_try_malloc(sizeof(struct context)))) {
472 sr_err("la8: %s: struct context malloc failed", __func__);
473 goto err_free_nothing;
476 /* Set some sane defaults. */
478 ctx->cur_samplerate = SR_MHZ(100); /* 100MHz == max. samplerate */
480 ctx->limit_samples = 0;
481 ctx->session_id = NULL;
482 memset(ctx->mangled_buf, 0, BS);
483 ctx->final_buf = NULL;
484 ctx->trigger_pattern = 0x00; /* Value irrelevant, see trigger_mask. */
485 ctx->trigger_mask = 0x00; /* All probes are "don't care". */
486 ctx->trigger_timeout = 10; /* Default to 10s trigger timeout. */
487 ctx->trigger_found = 0;
489 ctx->block_counter = 0;
490 ctx->divcount = 0; /* 10ns sample period == 100MHz samplerate */
492 /* Allocate memory where we'll store the de-mangled data. */
493 if (!(ctx->final_buf = g_try_malloc(SDRAM_SIZE))) {
494 sr_err("la8: %s: final_buf malloc failed", __func__);
498 /* Allocate memory for the FTDI context (ftdic) and initialize it. */
499 if (!(ctx->ftdic = ftdi_new())) {
500 sr_err("la8: %s: ftdi_new failed", __func__);
501 goto err_free_final_buf;
504 /* Check for the device and temporarily open it. */
505 if ((ret = ftdi_usb_open_desc(ctx->ftdic, USB_VENDOR_ID,
506 USB_PRODUCT_ID, USB_DESCRIPTION, NULL)) < 0) {
507 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
510 sr_dbg("la8: Found LA8 device (%04x:%04x).", USB_VENDOR_ID,
513 /* Register the device with libsigrok. */
514 sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING,
515 USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
517 sr_err("la8: %s: sr_dev_inst_new failed", __func__);
518 goto err_close_ftdic;
523 dev_insts = g_slist_append(dev_insts, sdi);
525 sr_spew("la8: Device init successful.");
527 /* Close device. We'll reopen it again when we need it. */
528 (void) la8_close(ctx); /* Log, but ignore errors. */
533 (void) la8_close(ctx); /* Log, but ignore errors. */
535 free(ctx->ftdic); /* NOT g_free()! */
537 g_free(ctx->final_buf);
545 static int hw_dev_open(int dev_index)
548 struct sr_dev_inst *sdi;
551 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
552 sr_err("la8: %s: sdi was NULL", __func__);
553 return SR_ERR; /* TODO: SR_ERR_ARG? */
556 if (!(ctx = sdi->priv)) {
557 sr_err("la8: %s: sdi->priv was NULL", __func__);
558 return SR_ERR; /* TODO: SR_ERR_ARG? */
561 sr_dbg("la8: Opening LA8 device (%04x:%04x).", USB_VENDOR_ID,
564 /* Open the device. */
565 if ((ret = ftdi_usb_open_desc(ctx->ftdic, USB_VENDOR_ID,
566 USB_PRODUCT_ID, USB_DESCRIPTION, NULL)) < 0) {
567 sr_err("la8: %s: ftdi_usb_open_desc: (%d) %s",
568 __func__, ret, ftdi_get_error_string(ctx->ftdic));
569 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
572 sr_dbg("la8: Device opened successfully.");
574 /* Purge RX/TX buffers in the FTDI chip. */
575 if ((ret = ftdi_usb_purge_buffers(ctx->ftdic)) < 0) {
576 sr_err("la8: %s: ftdi_usb_purge_buffers: (%d) %s",
577 __func__, ret, ftdi_get_error_string(ctx->ftdic));
578 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
579 goto err_dev_open_close_ftdic;
581 sr_dbg("la8: FTDI buffers purged successfully.");
583 /* Enable flow control in the FTDI chip. */
584 if ((ret = ftdi_setflowctrl(ctx->ftdic, SIO_RTS_CTS_HS)) < 0) {
585 sr_err("la8: %s: ftdi_setflowcontrol: (%d) %s",
586 __func__, ret, ftdi_get_error_string(ctx->ftdic));
587 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
588 goto err_dev_open_close_ftdic;
590 sr_dbg("la8: FTDI flow control enabled successfully.");
593 g_usleep(100 * 1000);
595 sdi->status = SR_ST_ACTIVE;
599 err_dev_open_close_ftdic:
600 (void) la8_close(ctx); /* Log, but ignore errors. */
604 static int set_samplerate(struct sr_dev_inst *sdi, uint64_t samplerate)
608 /* Note: Caller checked that sdi and sdi->priv != NULL. */
612 sr_spew("la8: Trying to set samplerate to %" PRIu64 "Hz.", samplerate);
614 fill_supported_samplerates_if_needed();
616 /* Check if this is a samplerate supported by the hardware. */
617 if (!is_valid_samplerate(samplerate))
620 /* Set the new samplerate. */
621 ctx->cur_samplerate = samplerate;
623 sr_dbg("la8: Samplerate set to %" PRIu64 "Hz.", ctx->cur_samplerate);
628 static int hw_dev_close(int dev_index)
630 struct sr_dev_inst *sdi;
633 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
634 sr_err("la8: %s: sdi was NULL", __func__);
635 return SR_ERR; /* TODO: SR_ERR_ARG? */
638 if (!(ctx = sdi->priv)) {
639 sr_err("la8: %s: sdi->priv was NULL", __func__);
640 return SR_ERR; /* TODO: SR_ERR_ARG? */
643 sr_dbg("la8: Closing device.");
645 if (sdi->status == SR_ST_ACTIVE) {
646 sr_dbg("la8: Status ACTIVE, closing device.");
647 /* TODO: Really ignore errors here, or return SR_ERR? */
648 (void) la8_close_usb_reset_sequencer(ctx); /* Ignore errors. */
650 sr_spew("la8: Status not ACTIVE, nothing to do.");
653 sdi->status = SR_ST_INACTIVE;
655 sr_dbg("la8: Freeing sample buffer.");
656 g_free(ctx->final_buf);
661 static int hw_cleanup(void)
664 struct sr_dev_inst *sdi;
667 /* Properly close all devices. */
668 for (l = dev_insts; l; l = l->next) {
669 if (!(sdi = l->data)) {
670 /* Log error, but continue cleaning up the rest. */
671 sr_err("la8: %s: sdi was NULL, continuing", __func__);
675 sr_dev_inst_free(sdi); /* Returns void. */
677 g_slist_free(dev_insts); /* Returns void. */
683 static void *hw_dev_info_get(int dev_index, int dev_info_id)
685 struct sr_dev_inst *sdi;
689 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
690 sr_err("la8: %s: sdi was NULL", __func__);
694 if (!(ctx = sdi->priv)) {
695 sr_err("la8: %s: sdi->priv was NULL", __func__);
699 sr_spew("la8: %s: dev_index %d, dev_info_id %d.", __func__,
700 dev_index, dev_info_id);
702 switch (dev_info_id) {
705 sr_spew("la8: %s: Returning sdi.", __func__);
707 case SR_DI_NUM_PROBES:
708 info = GINT_TO_POINTER(NUM_PROBES);
709 sr_spew("la8: %s: Returning number of probes: %d.", __func__,
712 case SR_DI_PROBE_NAMES:
714 sr_spew("la8: %s: Returning probenames.", __func__);
716 case SR_DI_SAMPLERATES:
717 fill_supported_samplerates_if_needed();
719 sr_spew("la8: %s: Returning samplerates.", __func__);
721 case SR_DI_TRIGGER_TYPES:
722 info = (char *)TRIGGER_TYPES;
723 sr_spew("la8: %s: Returning trigger types: %s.", __func__,
726 case SR_DI_CUR_SAMPLERATE:
727 info = &ctx->cur_samplerate;
728 sr_spew("la8: %s: Returning samplerate: %" PRIu64 "Hz.",
729 __func__, ctx->cur_samplerate);
732 /* Unknown device info ID, return NULL. */
733 sr_err("la8: %s: Unknown device info ID", __func__);
741 static int hw_dev_status_get(int dev_index)
743 struct sr_dev_inst *sdi;
745 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
746 sr_err("la8: %s: sdi was NULL, device not found", __func__);
747 return SR_ST_NOT_FOUND;
750 sr_dbg("la8: Returning status: %d.", sdi->status);
755 static int *hw_hwcap_get_all(void)
757 sr_spew("la8: Returning list of device capabilities.");
762 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
764 struct sr_dev_inst *sdi;
767 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
768 sr_err("la8: %s: sdi was NULL", __func__);
769 return SR_ERR; /* TODO: SR_ERR_ARG? */
772 if (!(ctx = sdi->priv)) {
773 sr_err("la8: %s: sdi->priv was NULL", __func__);
774 return SR_ERR; /* TODO: SR_ERR_ARG? */
777 sr_spew("la8: %s: dev_index %d, hwcap %d", __func__, dev_index, hwcap);
780 case SR_HWCAP_SAMPLERATE:
781 if (set_samplerate(sdi, *(uint64_t *)value) == SR_ERR) {
782 sr_err("la8: %s: setting samplerate failed.", __func__);
785 sr_dbg("la8: SAMPLERATE = %" PRIu64, ctx->cur_samplerate);
787 case SR_HWCAP_PROBECONFIG:
788 if (configure_probes(ctx, (GSList *)value) != SR_OK) {
789 sr_err("la8: %s: probe config failed.", __func__);
793 case SR_HWCAP_LIMIT_MSEC:
794 if (*(uint64_t *)value == 0) {
795 sr_err("la8: %s: LIMIT_MSEC can't be 0.", __func__);
798 ctx->limit_msec = *(uint64_t *)value;
799 sr_dbg("la8: LIMIT_MSEC = %" PRIu64, ctx->limit_msec);
801 case SR_HWCAP_LIMIT_SAMPLES:
802 if (*(uint64_t *)value < MIN_NUM_SAMPLES) {
803 sr_err("la8: %s: LIMIT_SAMPLES too small.", __func__);
806 ctx->limit_samples = *(uint64_t *)value;
807 sr_dbg("la8: LIMIT_SAMPLES = %" PRIu64, ctx->limit_samples);
810 /* Unknown capability, return SR_ERR. */
811 sr_err("la8: %s: Unknown capability.", __func__);
820 * Get a block of data from the LA8.
822 * @param ctx The struct containing private per-device-instance data. Must not
823 * be NULL. ctx->ftdic must not be NULL either.
824 * @return SR_OK upon success, or SR_ERR upon errors.
826 static int la8_read_block(struct context *ctx)
828 int i, byte_offset, m, mi, p, index, bytes_read;
831 /* Note: Caller checked that ctx and ctx->ftdic != NULL. */
833 sr_spew("la8: Reading block %d.", ctx->block_counter);
835 bytes_read = la8_read(ctx, ctx->mangled_buf, BS);
837 /* If first block read got 0 bytes, retry until success or timeout. */
838 if ((bytes_read == 0) && (ctx->block_counter == 0)) {
840 sr_spew("la8: Reading block 0 (again).");
841 bytes_read = la8_read(ctx, ctx->mangled_buf, BS);
842 /* TODO: How to handle read errors here? */
844 } while ((ctx->done > now) && (bytes_read == 0));
847 /* Check if block read was successful or a timeout occured. */
848 if (bytes_read != BS) {
849 sr_err("la8: Trigger timed out. Bytes read: %d.", bytes_read);
850 (void) la8_reset(ctx); /* Ignore errors. */
854 /* De-mangle the data. */
855 sr_spew("la8: Demangling block %d.", ctx->block_counter);
856 byte_offset = ctx->block_counter * BS;
857 m = byte_offset / (1024 * 1024);
858 mi = m * (1024 * 1024);
859 for (i = 0; i < BS; i++) {
861 index = m * 2 + (((byte_offset + i) - mi) / 2) * 16;
862 index += (ctx->divcount == 0) ? p : (1 - p);
863 ctx->final_buf[index] = ctx->mangled_buf[i];
869 static void send_block_to_session_bus(struct context *ctx, int block)
872 uint8_t sample, expected_sample;
873 struct sr_datafeed_packet packet;
874 struct sr_datafeed_logic logic;
875 int trigger_point; /* Relative trigger point (in this block). */
877 /* Note: No sanity checks on ctx/block, caller is responsible. */
879 /* Check if we can find the trigger condition in this block. */
881 expected_sample = ctx->trigger_pattern & ctx->trigger_mask;
882 for (i = 0; i < BS; i++) {
883 /* Don't continue if the trigger was found previously. */
884 if (ctx->trigger_found)
888 * Also, don't continue if triggers are "don't care", i.e. if
889 * no trigger conditions were specified by the user. In that
890 * case we don't want to send an SR_DF_TRIGGER packet at all.
892 if (ctx->trigger_mask == 0x00)
895 sample = *(ctx->final_buf + (block * BS) + i);
897 if ((sample & ctx->trigger_mask) == expected_sample) {
899 ctx->trigger_found = 1;
904 /* If no trigger was found, send one SR_DF_LOGIC packet. */
905 if (trigger_point == -1) {
906 /* Send an SR_DF_LOGIC packet to the session bus. */
907 sr_spew("la8: sending SR_DF_LOGIC packet (%d bytes) for "
908 "block %d", BS, block);
909 packet.type = SR_DF_LOGIC;
910 packet.payload = &logic;
913 logic.data = ctx->final_buf + (block * BS);
914 sr_session_bus(ctx->session_id, &packet);
919 * We found the trigger, so some special handling is needed. We have
920 * to send an SR_DF_LOGIC packet with the samples before the trigger
921 * (if any), then the SD_DF_TRIGGER packet itself, then another
922 * SR_DF_LOGIC packet with the samples after the trigger (if any).
925 /* TODO: Send SR_DF_TRIGGER packet before or after the actual sample? */
927 /* If at least one sample is located before the trigger... */
928 if (trigger_point > 0) {
929 /* Send pre-trigger SR_DF_LOGIC packet to the session bus. */
930 sr_spew("la8: sending pre-trigger SR_DF_LOGIC packet, "
931 "start = %d, length = %d", block * BS, trigger_point);
932 packet.type = SR_DF_LOGIC;
933 packet.payload = &logic;
934 logic.length = trigger_point;
936 logic.data = ctx->final_buf + (block * BS);
937 sr_session_bus(ctx->session_id, &packet);
940 /* Send the SR_DF_TRIGGER packet to the session bus. */
941 sr_spew("la8: sending SR_DF_TRIGGER packet, sample = %d",
942 (block * BS) + trigger_point);
943 packet.type = SR_DF_TRIGGER;
944 packet.payload = NULL;
945 sr_session_bus(ctx->session_id, &packet);
947 /* If at least one sample is located after the trigger... */
948 if (trigger_point < (BS - 1)) {
949 /* Send post-trigger SR_DF_LOGIC packet to the session bus. */
950 sr_spew("la8: sending post-trigger SR_DF_LOGIC packet, "
951 "start = %d, length = %d",
952 (block * BS) + trigger_point, BS - trigger_point);
953 packet.type = SR_DF_LOGIC;
954 packet.payload = &logic;
955 logic.length = BS - trigger_point;
957 logic.data = ctx->final_buf + (block * BS) + trigger_point;
958 sr_session_bus(ctx->session_id, &packet);
962 static int receive_data(int fd, int revents, void *session_data)
965 struct sr_dev_inst *sdi;
968 /* Avoid compiler errors. */
972 if (!(sdi = session_data)) {
973 sr_err("la8: %s: session_data was NULL", __func__);
977 if (!(ctx = sdi->priv)) {
978 sr_err("la8: %s: sdi->priv was NULL", __func__);
983 sr_err("la8: %s: ctx->ftdic was NULL", __func__);
987 /* Get one block of data. */
988 if ((ret = la8_read_block(ctx)) < 0) {
989 sr_err("la8: %s: la8_read_block error: %d", __func__, ret);
990 hw_dev_acquisition_stop(sdi->index, session_data);
994 /* We need to get exactly NUM_BLOCKS blocks (i.e. 8MB) of data. */
995 if (ctx->block_counter != (NUM_BLOCKS - 1)) {
996 ctx->block_counter++;
1000 sr_dbg("la8: Sampling finished, sending data to session bus now.");
1002 /* All data was received and demangled, send it to the session bus. */
1003 for (i = 0; i < NUM_BLOCKS; i++)
1004 send_block_to_session_bus(ctx, i);
1006 hw_dev_acquisition_stop(sdi->index, session_data);
1008 // return FALSE; /* FIXME? */
1012 static int hw_dev_acquisition_start(int dev_index, gpointer session_data)
1014 struct sr_dev_inst *sdi;
1015 struct context *ctx;
1016 struct sr_datafeed_packet packet;
1017 struct sr_datafeed_header header;
1021 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
1022 sr_err("la8: %s: sdi was NULL", __func__);
1023 return SR_ERR; /* TODO: SR_ERR_ARG? */
1026 if (!(ctx = sdi->priv)) {
1027 sr_err("la8: %s: sdi->priv was NULL", __func__);
1028 return SR_ERR; /* TODO: SR_ERR_ARG? */
1032 sr_err("la8: %s: ctx->ftdic was NULL", __func__);
1036 ctx->divcount = samplerate_to_divcount(ctx->cur_samplerate);
1037 if (ctx->divcount == 0xff) {
1038 sr_err("la8: %s: invalid divcount/samplerate", __func__);
1042 sr_dbg("la8: Starting acquisition.");
1044 /* Fill acquisition parameters into buf[]. */
1045 buf[0] = ctx->divcount;
1046 buf[1] = 0xff; /* This byte must always be 0xff. */
1047 buf[2] = ctx->trigger_pattern;
1048 buf[3] = ctx->trigger_mask;
1050 /* Start acquisition. */
1051 bytes_written = la8_write(ctx, buf, 4);
1053 if (bytes_written < 0) {
1054 sr_err("la8: Acquisition failed to start.");
1056 } else if (bytes_written != 4) {
1057 sr_err("la8: Acquisition failed to start.");
1058 return SR_ERR; /* TODO: Other error and return code? */
1061 sr_dbg("la8: Acquisition started successfully.");
1063 ctx->session_id = session_data;
1065 /* Send header packet to the session bus. */
1066 sr_dbg("la8: Sending SR_DF_HEADER.");
1067 packet.type = SR_DF_HEADER;
1068 packet.payload = &header;
1069 header.feed_version = 1;
1070 gettimeofday(&header.starttime, NULL);
1071 header.samplerate = ctx->cur_samplerate;
1072 header.num_logic_probes = NUM_PROBES;
1073 sr_session_bus(session_data, &packet);
1075 /* Time when we should be done (for detecting trigger timeouts). */
1076 ctx->done = (ctx->divcount + 1) * 0.08388608 + time(NULL)
1077 + ctx->trigger_timeout;
1078 ctx->block_counter = 0;
1079 ctx->trigger_found = 0;
1081 /* Hook up a dummy handler to receive data from the LA8. */
1082 sr_source_add(-1, G_IO_IN, 0, receive_data, sdi);
1087 static int hw_dev_acquisition_stop(int dev_index, gpointer session_data)
1089 struct sr_dev_inst *sdi;
1090 struct context *ctx;
1091 struct sr_datafeed_packet packet;
1093 sr_dbg("la8: Stopping acquisition.");
1095 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
1096 sr_err("la8: %s: sdi was NULL", __func__);
1100 if (!(ctx = sdi->priv)) {
1101 sr_err("la8: %s: sdi->priv was NULL", __func__);
1105 /* Send end packet to the session bus. */
1106 sr_dbg("la8: Sending SR_DF_END.");
1107 packet.type = SR_DF_END;
1108 sr_session_bus(session_data, &packet);
1113 SR_PRIV struct sr_dev_plugin chronovu_la8_plugin_info = {
1114 .name = "chronovu-la8",
1115 .longname = "ChronoVu LA8",
1118 .cleanup = hw_cleanup,
1119 .dev_open = hw_dev_open,
1120 .dev_close = hw_dev_close,
1121 .dev_info_get = hw_dev_info_get,
1122 .dev_status_get = hw_dev_status_get,
1123 .hwcap_get_all = hw_hwcap_get_all,
1124 .dev_config_set = hw_dev_config_set,
1125 .dev_acquisition_start = hw_dev_acquisition_start,
1126 .dev_acquisition_stop = hw_dev_acquisition_stop,