2 * This file is part of the libsigrok project.
4 * Copyright (C) 2020 Florian Schmidt <schmidt_florian@gmx.de>
5 * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
6 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
7 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include <libsigrok/libsigrok.h>
28 #include "libsigrok-internal.h"
31 #define UC_FIRMWARE "kingst-la-%04x.fw"
32 #define FPGA_FW_LA2016 "kingst-la2016-fpga.bitstream"
33 #define FPGA_FW_LA2016A "kingst-la2016a1-fpga.bitstream"
34 #define FPGA_FW_LA1016 "kingst-la1016-fpga.bitstream"
35 #define FPGA_FW_LA1016A "kingst-la1016a1-fpga.bitstream"
37 /* Maximum device capabilities. May differ between models. */
38 #define MAX_SAMPLE_RATE_LA2016 SR_MHZ(200)
39 #define MAX_SAMPLE_RATE_LA1016 SR_MHZ(100)
40 #define MAX_SAMPLE_DEPTH 10e9
41 #define MAX_PWM_FREQ SR_MHZ(20)
42 #define PWM_CLOCK SR_MHZ(200) /* 200MHz for both LA2016 and LA1016 */
45 * Default device configuration. Must be applicable to any of the
46 * supported devices (no model specific default values yet). Specific
47 * firmware implementation details unfortunately won't let us detect
48 * and keep using previously configured values.
50 #define LA2016_DFLT_SAMPLERATE SR_MHZ(100)
51 #define LA2016_DFLT_SAMPLEDEPTH (5 * 1000 * 1000)
52 #define LA2016_DFLT_CAPT_RATIO 5 /* Capture ratio, in percent. */
55 * What is the origin and motivation of that 128Mi literal? What is its
56 * unit? How does it relate to a device's hardware capabilities? How to
57 * map the 1GiB of RAM of an LA2016 (at 16 channels) to the 128Mi value?
58 * It cannot be sample count. Is it memory size in bytes perhaps?
60 #define LA2016_PRE_MEM_LIMIT_BASE (128 * 1024 * 1024)
62 /* USB vendor class control requests, executed by the Cypress FX2 MCU. */
63 #define CMD_FPGA_ENABLE 0x10
64 #define CMD_FPGA_SPI 0x20 /* R/W access to FPGA registers via SPI. */
65 #define CMD_BULK_START 0x30 /* Start sample data download via USB EP6 IN. */
66 #define CMD_BULK_RESET 0x38 /* Flush FIFO of FX2 USB EP6 IN. */
67 #define CMD_FPGA_INIT 0x50 /* Used before and after FPGA bitstream upload. */
68 #define CMD_KAUTH 0x60 /* Communicate to auth IC (U10). Not used. */
69 #define CMD_EEPROM 0xa2 /* R/W access to EEPROM content. */
72 * FPGA register addresses (base addresses when registers span multiple
73 * bytes, in that case data is kept in little endian format). Passed to
74 * CMD_FPGA_SPI requests. The FX2 MCU transparently handles the detail
75 * of SPI transfers encoding the read (1) or write (0) direction in the
76 * MSB of the address field. There are some 60 byte-wide FPGA registers.
78 * Unfortunately the FPGA registers change their meaning between the
79 * read and write directions of access, or exclusively provide one of
80 * these directions and not the other. This is an arbitrary vendor's
81 * choice, there is nothing which the sigrok driver could do about it.
82 * Values written to registers typically cannot get read back, neither
83 * verified after writing a configuration, nor queried upon startup for
84 * automatic detection of the current configuration. Neither appear to
85 * be there echo registers for presence and communication checks, nor
86 * version identifying registers, as far as we know.
88 #define REG_RUN 0x00 /* Read capture status, write start capture. */
89 #define REG_PWM_EN 0x02 /* User PWM channels on/off. */
90 #define REG_CAPT_MODE 0x03 /* Write 0x00 capture to SDRAM, 0x01 streaming. */
91 #define REG_BULK 0x08 /* Write start addr, byte count to download samples. */
92 #define REG_SAMPLING 0x10 /* Write capture config, read capture SDRAM location. */
93 #define REG_TRIGGER 0x20 /* write level and edge trigger config. */
94 #define REG_THRESHOLD 0x68 /* Write PWM config to setup input threshold DAC. */
95 #define REG_PWM1 0x70 /* Write config for user PWM1. */
96 #define REG_PWM2 0x78 /* Write config for user PWM2. */
98 /* Bit patterns to write to REG_RUN, setup run mode. */
99 #define RUNMODE_HALT 0x00
100 #define RUNMODE_RUN 0x03
102 /* Bit patterns when reading from REG_RUN, get run state. */
103 #define RUNSTATE_IDLE_BIT (1UL << 0)
104 #define RUNSTATE_DRAM_BIT (1UL << 1)
105 #define RUNSTATE_TRGD_BIT (1UL << 2)
106 #define RUNSTATE_POST_BIT (1UL << 3)
108 static int ctrl_in(const struct sr_dev_inst *sdi,
109 uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
110 void *data, uint16_t wLength)
112 struct sr_usb_dev_inst *usb;
117 if ((ret = libusb_control_transfer(usb->devhdl,
118 LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN,
119 bRequest, wValue, wIndex, (unsigned char *)data, wLength,
120 DEFAULT_TIMEOUT_MS)) != wLength) {
121 sr_dbg("USB ctrl in: %d bytes, req %d val %#x idx %d: %s.",
122 wLength, bRequest, wValue, wIndex,
123 libusb_error_name(ret));
124 sr_err("Cannot read %d bytes from USB: %s.",
125 wLength, libusb_error_name(ret));
132 static int ctrl_out(const struct sr_dev_inst *sdi,
133 uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
134 void *data, uint16_t wLength)
136 struct sr_usb_dev_inst *usb;
141 if ((ret = libusb_control_transfer(usb->devhdl,
142 LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT,
143 bRequest, wValue, wIndex, (unsigned char*)data, wLength,
144 DEFAULT_TIMEOUT_MS)) != wLength) {
145 sr_dbg("USB ctrl out: %d bytes, req %d val %#x idx %d: %s.",
146 wLength, bRequest, wValue, wIndex,
147 libusb_error_name(ret));
148 sr_err("Cannot write %d bytes to USB: %s.",
149 wLength, libusb_error_name(ret));
157 * Check the necessity for FPGA bitstream upload, because another upload
158 * would take some 600ms which is undesirable after program startup. Try
159 * to access some FPGA registers and check the values' plausibility. The
160 * check should fail on the safe side, request another upload when in
161 * doubt. A positive response (the request to continue operation with the
162 * currently active bitstream) should be conservative. Accessing multiple
163 * registers is considered cheap compared to the cost of bitstream upload.
165 * It helps though that both the vendor software and the sigrok driver
166 * use the same bundle of MCU firmware and FPGA bitstream for any of the
167 * supported models. We don't expect to successfully communicate to the
168 * device yet disagree on its protocol. Ideally we would access version
169 * identifying registers for improved robustness, but are not aware of
170 * any. A bitstream reload can always be forced by a power cycle.
172 static int check_fpga_bitstream(const struct sr_dev_inst *sdi)
179 uint8_t buff[sizeof(run_state)];
180 const uint8_t *rdptr;
182 sr_dbg("Checking operation of the FPGA bitstream.");
185 ret = ctrl_in(sdi, CMD_FPGA_INIT, 0x00, 0, &init_rsp, sizeof(init_rsp));
186 if (ret != SR_OK || init_rsp != 0) {
187 sr_dbg("FPGA init query failed, or unexpected response.");
191 read_len = sizeof(run_state);
192 ret = ctrl_in(sdi, CMD_FPGA_SPI, REG_RUN, 0, buff, read_len);
194 sr_dbg("FPGA register access failed (run state).");
198 run_state = read_u16le_inc(&rdptr);
199 sr_spew("FPGA register: run state 0x%04x.", run_state);
200 if (run_state && (run_state & 0x3) != 0x1) {
201 sr_dbg("Unexpected FPGA register content (run state).");
204 if (run_state && (run_state & ~0xf) != 0x85e0) {
205 sr_dbg("Unexpected FPGA register content (run state).");
209 read_len = sizeof(pwm_en);
210 ret = ctrl_in(sdi, CMD_FPGA_SPI, REG_PWM_EN, 0, buff, read_len);
212 sr_dbg("FPGA register access failed (PWM enable).");
216 pwm_en = read_u8_inc(&rdptr);
217 sr_spew("FPGA register: PWM enable 0x%02x.", pwm_en);
218 if ((pwm_en & 0x3) != 0x0) {
219 sr_dbg("Unexpected FPGA register content (PWM enable).");
223 sr_info("Could re-use current FPGA bitstream. No upload required.");
227 static int upload_fpga_bitstream(const struct sr_dev_inst *sdi,
228 const char *bitstream_fname)
230 struct drv_context *drvc;
231 struct sr_usb_dev_inst *usb;
232 struct sr_resource bitstream;
233 uint32_t bitstream_size;
234 uint8_t buffer[sizeof(uint32_t)];
240 unsigned int zero_pad_to;
242 drvc = sdi->driver->context;
245 sr_info("Uploading FPGA bitstream '%s'.", bitstream_fname);
247 ret = sr_resource_open(drvc->sr_ctx, &bitstream, SR_RESOURCE_FIRMWARE, bitstream_fname);
249 sr_err("Cannot find FPGA bitstream %s.", bitstream_fname);
253 bitstream_size = (uint32_t)bitstream.size;
255 write_u32le_inc(&wrptr, bitstream_size);
256 if ((ret = ctrl_out(sdi, CMD_FPGA_INIT, 0x00, 0, buffer, wrptr - buffer)) != SR_OK) {
257 sr_err("Cannot initiate FPGA bitstream upload.");
258 sr_resource_close(drvc->sr_ctx, &bitstream);
261 zero_pad_to = bitstream_size;
262 zero_pad_to += LA2016_EP2_PADDING - 1;
263 zero_pad_to /= LA2016_EP2_PADDING;
264 zero_pad_to *= LA2016_EP2_PADDING;
268 if (pos < bitstream.size) {
269 len = (int)sr_resource_read(drvc->sr_ctx, &bitstream, &block, sizeof(block));
271 sr_err("Cannot read FPGA bitstream.");
272 sr_resource_close(drvc->sr_ctx, &bitstream);
276 /* Zero-pad until 'zero_pad_to'. */
277 len = zero_pad_to - pos;
278 if ((unsigned)len > sizeof(block))
280 memset(&block, 0, len);
285 ret = libusb_bulk_transfer(usb->devhdl, USB_EP_FPGA_BITSTREAM,
286 &block[0], len, &act_len, DEFAULT_TIMEOUT_MS);
288 sr_dbg("Cannot write FPGA bitstream, block %#x len %d: %s.",
289 pos, (int)len, libusb_error_name(ret));
293 if (act_len != len) {
294 sr_dbg("Short write for FPGA bitstream, block %#x len %d: got %d.",
295 pos, (int)len, act_len);
301 sr_resource_close(drvc->sr_ctx, &bitstream);
304 sr_info("FPGA bitstream upload (%" PRIu64 " bytes) done.",
310 static int enable_fpga_bitstream(const struct sr_dev_inst *sdi)
315 if ((ret = ctrl_in(sdi, CMD_FPGA_INIT, 0x00, 0, &cmd_resp, sizeof(cmd_resp))) != SR_OK) {
316 sr_err("Cannot read response after FPGA bitstream upload.");
320 sr_err("Unexpected FPGA bitstream upload response, got 0x%02x, want 0.",
326 if ((ret = ctrl_out(sdi, CMD_FPGA_ENABLE, 0x01, 0, NULL, 0)) != SR_OK) {
327 sr_err("Cannot enable FPGA after bitstream upload.");
335 static int set_threshold_voltage(const struct sr_dev_inst *sdi, float voltage)
337 struct dev_context *devc;
342 uint16_t duty_R79, duty_R56;
343 uint8_t buf[2 * sizeof(uint16_t)];
346 /* Clamp threshold setting to valid range for LA2016. */
349 } else if (voltage < -4.0) {
354 * Two PWM output channels feed one DAC which generates a bias
355 * voltage, which offsets the input probe's voltage level, and
356 * in combination with the FPGA pins' fixed threshold result in
357 * a programmable input threshold from the user's perspective.
358 * The PWM outputs can be seen on R79 and R56 respectively, the
359 * frequency is 100kHz and the duty cycle varies. The R79 PWM
360 * uses three discrete settings. The R56 PWM varies with desired
361 * thresholds and depends on the R79 PWM configuration. See the
362 * schematics comments which discuss the formulae.
364 if (voltage >= 2.9) {
365 duty_R79 = 0; /* PWM off (0V). */
366 duty_R56 = (uint16_t)(302 * voltage - 363);
367 } else if (voltage > -0.4) {
368 duty_R79 = 0x00f2; /* 25% duty cycle. */
369 duty_R56 = (uint16_t)(302 * voltage + 121);
371 duty_R79 = 0x02d7; /* 72% duty cycle. */
372 duty_R56 = (uint16_t)(302 * voltage + 1090);
375 /* Clamp duty register values to sensible limits. */
378 } else if (duty_R56 > 1100) {
382 sr_dbg("Set threshold voltage %.2fV.", voltage);
383 sr_dbg("Duty cycle values: R56 0x%04x, R79 0x%04x.", duty_R56, duty_R79);
386 write_u16le_inc(&wrptr, duty_R56);
387 write_u16le_inc(&wrptr, duty_R79);
389 ret = ctrl_out(sdi, CMD_FPGA_SPI, REG_THRESHOLD, 0, buf, wrptr - buf);
391 sr_err("Cannot set threshold voltage %.2fV.", voltage);
394 devc->threshold_voltage = voltage;
399 static int enable_pwm(const struct sr_dev_inst *sdi, uint8_t p1, uint8_t p2)
401 struct dev_context *devc;
408 if (p1) cfg |= 1 << 0;
409 if (p2) cfg |= 1 << 1;
411 sr_dbg("Set PWM enable %d %d. Config 0x%02x.", p1, p2, cfg);
412 ret = ctrl_out(sdi, CMD_FPGA_SPI, REG_PWM_EN, 0, &cfg, sizeof(cfg));
414 sr_err("Cannot setup PWM enabled state.");
417 devc->pwm_setting[0].enabled = (p1) ? 1 : 0;
418 devc->pwm_setting[1].enabled = (p2) ? 1 : 0;
423 static int set_pwm(const struct sr_dev_inst *sdi, uint8_t which,
424 float freq, float duty)
426 int CTRL_PWM[] = { REG_PWM1, REG_PWM2 };
427 struct dev_context *devc;
428 pwm_setting_dev_t cfg;
429 pwm_setting_t *setting;
431 uint8_t buf[2 * sizeof(uint32_t)];
436 if (which < 1 || which > ARRAY_SIZE(CTRL_PWM)) {
437 sr_err("Invalid PWM channel: %d.", which);
440 if (freq > MAX_PWM_FREQ) {
441 sr_err("Too high a PWM frequency: %.1f.", freq);
444 if (duty > 100 || duty < 0) {
445 sr_err("Invalid PWM duty cycle: %f.", duty);
449 cfg.period = (uint32_t)(PWM_CLOCK / freq);
450 cfg.duty = (uint32_t)(0.5f + (cfg.period * duty / 100.));
451 sr_dbg("Set PWM%d period %d, duty %d.", which, cfg.period, cfg.duty);
454 write_u32le_inc(&wrptr, cfg.period);
455 write_u32le_inc(&wrptr, cfg.duty);
456 ret = ctrl_out(sdi, CMD_FPGA_SPI, CTRL_PWM[which - 1], 0, buf, wrptr - buf);
458 sr_err("Cannot setup PWM%d configuration %d %d.",
459 which, cfg.period, cfg.duty);
462 setting = &devc->pwm_setting[which - 1];
463 setting->freq = freq;
464 setting->duty = duty;
469 static int set_defaults(const struct sr_dev_inst *sdi)
471 struct dev_context *devc;
476 devc->capture_ratio = LA2016_DFLT_CAPT_RATIO;
477 devc->cur_channels = 0xffff;
478 devc->limit_samples = LA2016_DFLT_SAMPLEDEPTH;
479 devc->cur_samplerate = LA2016_DFLT_SAMPLERATE;
481 ret = set_threshold_voltage(sdi, devc->threshold_voltage);
485 ret = enable_pwm(sdi, 0, 0);
489 ret = set_pwm(sdi, 1, SR_KHZ(1), 50);
493 ret = set_pwm(sdi, 2, SR_KHZ(100), 50);
497 ret = enable_pwm(sdi, 1, 1);
504 static int set_trigger_config(const struct sr_dev_inst *sdi)
506 struct dev_context *devc;
507 struct sr_trigger *trigger;
511 struct sr_trigger_stage *stage1;
512 struct sr_trigger_match *match;
515 uint8_t buf[4 * sizeof(uint32_t)];
519 trigger = sr_session_trigger_get(sdi->session);
521 memset(&cfg, 0, sizeof(cfg));
523 cfg.channels = devc->cur_channels;
525 if (trigger && trigger->stages) {
526 stages = trigger->stages;
527 stage1 = stages->data;
529 sr_err("Only one trigger stage supported for now.");
532 channel = stage1->matches;
534 match = channel->data;
535 ch_mask = 1 << match->channel->index;
537 switch (match->match) {
538 case SR_TRIGGER_ZERO:
539 cfg.level |= ch_mask;
540 cfg.high_or_falling &= ~ch_mask;
543 cfg.level |= ch_mask;
544 cfg.high_or_falling |= ch_mask;
546 case SR_TRIGGER_RISING:
547 if ((cfg.enabled & ~cfg.level)) {
548 sr_err("Device only supports one edge trigger.");
551 cfg.level &= ~ch_mask;
552 cfg.high_or_falling &= ~ch_mask;
554 case SR_TRIGGER_FALLING:
555 if ((cfg.enabled & ~cfg.level)) {
556 sr_err("Device only supports one edge trigger.");
559 cfg.level &= ~ch_mask;
560 cfg.high_or_falling |= ch_mask;
563 sr_err("Unknown trigger condition.");
566 cfg.enabled |= ch_mask;
567 channel = channel->next;
570 sr_dbg("Set trigger config: "
571 "channels 0x%04x, trigger-enabled 0x%04x, "
572 "level-triggered 0x%04x, high/falling 0x%04x.",
573 cfg.channels, cfg.enabled, cfg.level, cfg.high_or_falling);
575 devc->had_triggers_configured = cfg.enabled != 0;
578 write_u32le_inc(&wrptr, cfg.channels);
579 write_u32le_inc(&wrptr, cfg.enabled);
580 write_u32le_inc(&wrptr, cfg.level);
581 write_u32le_inc(&wrptr, cfg.high_or_falling);
583 * Comment on this literal 16. Origin, meaning? Cannot be the
584 * register offset, nor the transfer length. Is it a channels
585 * count that is relevant for 16 and 32 channel models? Is it
586 * an obsolete experiment?
588 ret = ctrl_out(sdi, CMD_FPGA_SPI, REG_TRIGGER, 16, buf, wrptr - buf);
590 sr_err("Cannot setup trigger configuration.");
597 static int set_sample_config(const struct sr_dev_inst *sdi)
599 struct dev_context *devc;
600 double clock_divisor;
601 uint16_t divider_u16;
602 uint64_t pre_trigger_samples;
603 uint64_t pre_trigger_memory;
604 uint8_t buf[REG_TRIGGER - REG_SAMPLING]; /* Width of REG_SAMPLING. */
610 if (devc->cur_samplerate > devc->max_samplerate) {
611 sr_err("Too high a sample rate: %" PRIu64 ".",
612 devc->cur_samplerate);
616 clock_divisor = devc->max_samplerate / (double)devc->cur_samplerate;
617 if (clock_divisor > 65535)
619 divider_u16 = (uint16_t)(clock_divisor + 0.5);
620 devc->cur_samplerate = devc->max_samplerate / divider_u16;
622 if (devc->limit_samples > MAX_SAMPLE_DEPTH) {
623 sr_err("Too high a sample depth: %" PRIu64 ".",
624 devc->limit_samples);
629 * The acquisition configuration communicates "pre-trigger"
630 * specs in several formats. sigrok users provide a percentage
631 * (0-100%), which translates to a pre-trigger samples count
632 * (assuming that a total samples count limit was specified).
633 * The device supports hardware compression, which depends on
634 * slowly changing input data to be effective. Fast changing
635 * input data may occupy more space in sample memory than its
636 * uncompressed form would. This is why a third parameter can
637 * limit the amount of sample memory to use for pre-trigger
638 * data. Only the upper 24 bits of that memory size spec get
639 * communicated to the device (written to its FPGA register).
641 pre_trigger_samples = devc->limit_samples * devc->capture_ratio / 100;
642 pre_trigger_memory = LA2016_PRE_MEM_LIMIT_BASE;
643 pre_trigger_memory *= devc->capture_ratio;
644 pre_trigger_memory /= 100;
646 sr_dbg("Set sample config: %" PRIu64 "kHz, %" PRIu64 " samples.",
647 devc->cur_samplerate / 1000, devc->limit_samples);
648 sr_dbg("Capture ratio %" PRIu64 "%%, count %" PRIu64 ", mem %" PRIu64 ".",
649 devc->capture_ratio, pre_trigger_samples, pre_trigger_memory);
652 * The acquisition configuration occupies a total of 16 bytes:
653 * - A 34bit total samples count limit (up to 10 billions) that
654 * is kept in a 40bit register.
655 * - A 34bit pre-trigger samples count limit (up to 10 billions)
656 * in another 40bit register.
657 * - A 32bit pre-trigger memory space limit (in bytes) of which
658 * the upper 24bits are kept in an FPGA register.
659 * - A 16bit clock divider which gets applied to the maximum
660 * samplerate of the device.
661 * - An 8bit register of unknown meaning. Currently always 0.
664 write_u40le_inc(&wrptr, devc->limit_samples);
665 write_u40le_inc(&wrptr, pre_trigger_samples);
666 write_u24le_inc(&wrptr, pre_trigger_memory >> 8);
667 write_u16le_inc(&wrptr, divider_u16);
668 write_u8_inc(&wrptr, 0);
669 ret = ctrl_out(sdi, CMD_FPGA_SPI, REG_SAMPLING, 0, buf, wrptr - buf);
671 sr_err("Cannot setup acquisition configuration.");
679 * FPGA register REG_RUN holds the run state (u16le format). Bit fields
681 * bit 0: value 1 = idle
682 * bit 1: value 1 = writing to SDRAM
683 * bit 2: value 0 = waiting for trigger, 1 = trigger seen
684 * bit 3: value 0 = pretrigger sampling, 1 = posttrigger sampling
685 * The meaning of other bit fields is unknown.
687 * Typical values in order of appearance during execution:
688 * 0x85e1: idle, no acquisition pending
689 * IDLE set, TRGD don't care, POST don't care; DRAM don't care
690 * "In idle state." Takes precedence over all others.
691 * 0x85e2: pre-sampling, samples before the trigger position,
692 * when capture ratio > 0%
693 * IDLE clear, TRGD clear, POST clear; DRAM don't care
694 * "Not idle any more, no post yet, not triggered yet."
695 * 0x85ea: pre-sampling complete, now waiting for the trigger
696 * (whilst sampling continuously)
697 * IDLE clear, TRGD clear, POST set; DRAM don't care
698 * "Post set thus after pre, not triggered yet"
699 * 0x85ee: trigger seen, capturing post-trigger samples, running
700 * IDLE clear, TRGD set, POST set; DRAM don't care
701 * "Triggered and in post, not idle yet."
703 * IDLE set, TRGD don't care, POST don't care; DRAM don't care
704 * "In idle state." TRGD/POST don't care, same meaning as above.
706 static const uint16_t runstate_mask_idle = RUNSTATE_IDLE_BIT;
707 static const uint16_t runstate_patt_idle = RUNSTATE_IDLE_BIT;
708 static const uint16_t runstate_mask_step =
709 RUNSTATE_IDLE_BIT | RUNSTATE_TRGD_BIT | RUNSTATE_POST_BIT;
710 static const uint16_t runstate_patt_pre_trig = 0;
711 static const uint16_t runstate_patt_wait_trig = RUNSTATE_POST_BIT;
712 static const uint16_t runstate_patt_post_trig =
713 RUNSTATE_TRGD_BIT | RUNSTATE_POST_BIT;
715 static uint16_t run_state(const struct sr_dev_inst *sdi)
717 static uint16_t previous_state;
721 uint8_t buff[sizeof(state)];
722 const uint8_t *rdptr;
725 if ((ret = ctrl_in(sdi, CMD_FPGA_SPI, REG_RUN, 0, buff, sizeof(state))) != SR_OK) {
726 sr_err("Cannot read run state.");
730 state = read_u16le_inc(&rdptr);
733 * Avoid flooding the log, only dump values as they change.
734 * The routine is called about every 50ms.
736 if (state == previous_state)
739 previous_state = state;
741 if ((state & runstate_mask_idle) == runstate_patt_idle)
743 if ((state & runstate_mask_step) == runstate_patt_pre_trig)
744 label = "pre-trigger sampling";
745 if ((state & runstate_mask_step) == runstate_patt_wait_trig)
746 label = "sampling, waiting for trigger";
747 if ((state & runstate_mask_step) == runstate_patt_post_trig)
748 label = "post-trigger sampling";
750 sr_dbg("Run state: 0x%04x (%s).", state, label);
752 sr_dbg("Run state: 0x%04x.", state);
757 static int la2016_has_triggered(const struct sr_dev_inst *sdi)
761 state = run_state(sdi);
762 if ((state & runstate_mask_idle) == runstate_patt_idle)
768 static int set_run_mode(const struct sr_dev_inst *sdi, uint8_t mode)
772 if ((ret = ctrl_out(sdi, CMD_FPGA_SPI, REG_RUN, 0, &mode, sizeof(mode))) != SR_OK) {
773 sr_err("Cannot configure run mode %d.", mode);
780 static int get_capture_info(const struct sr_dev_inst *sdi)
782 struct dev_context *devc;
784 uint8_t buf[3 * sizeof(uint32_t)];
785 const uint8_t *rdptr;
789 if ((ret = ctrl_in(sdi, CMD_FPGA_SPI, REG_SAMPLING, 0, buf, sizeof(buf))) != SR_OK) {
790 sr_err("Cannot read capture info.");
795 devc->info.n_rep_packets = read_u32le_inc(&rdptr);
796 devc->info.n_rep_packets_before_trigger = read_u32le_inc(&rdptr);
797 devc->info.write_pos = read_u32le_inc(&rdptr);
799 sr_dbg("Capture info: n_rep_packets: 0x%08x/%d, before_trigger: 0x%08x/%d, write_pos: 0x%08x%d.",
800 devc->info.n_rep_packets, devc->info.n_rep_packets,
801 devc->info.n_rep_packets_before_trigger,
802 devc->info.n_rep_packets_before_trigger,
803 devc->info.write_pos, devc->info.write_pos);
805 if (devc->info.n_rep_packets % NUM_PACKETS_IN_CHUNK) {
806 sr_warn("Unexpected packets count %lu, not a multiple of %d.",
807 (unsigned long)devc->info.n_rep_packets,
808 NUM_PACKETS_IN_CHUNK);
814 SR_PRIV int la2016_upload_firmware(struct sr_context *sr_ctx,
815 libusb_device *dev, uint16_t product_id)
818 snprintf(fw_file, sizeof(fw_file) - 1, UC_FIRMWARE, product_id);
819 return ezusb_upload_firmware(sr_ctx, dev, USB_CONFIGURATION, fw_file);
822 SR_PRIV int la2016_setup_acquisition(const struct sr_dev_inst *sdi)
824 struct dev_context *devc;
830 ret = set_threshold_voltage(sdi, devc->threshold_voltage);
835 if ((ret = ctrl_out(sdi, CMD_FPGA_SPI, REG_CAPT_MODE, 0, &cmd, sizeof(cmd))) != SR_OK) {
836 sr_err("Cannot send command to stop sampling.");
840 ret = set_trigger_config(sdi);
844 ret = set_sample_config(sdi);
851 SR_PRIV int la2016_start_acquisition(const struct sr_dev_inst *sdi)
855 ret = set_run_mode(sdi, RUNMODE_RUN);
862 static int la2016_stop_acquisition(const struct sr_dev_inst *sdi)
866 ret = set_run_mode(sdi, RUNMODE_HALT);
873 SR_PRIV int la2016_abort_acquisition(const struct sr_dev_inst *sdi)
876 struct dev_context *devc;
878 ret = la2016_stop_acquisition(sdi);
882 devc = sdi ? sdi->priv : NULL;
883 if (devc && devc->transfer)
884 libusb_cancel_transfer(devc->transfer);
889 static int la2016_start_retrieval(const struct sr_dev_inst *sdi,
890 libusb_transfer_cb_fn cb)
892 struct dev_context *devc;
893 struct sr_usb_dev_inst *usb;
895 uint8_t wrbuf[2 * sizeof(uint32_t)];
903 if ((ret = get_capture_info(sdi)) != SR_OK)
906 devc->n_transfer_packets_to_read = devc->info.n_rep_packets / NUM_PACKETS_IN_CHUNK;
907 devc->n_bytes_to_read = devc->n_transfer_packets_to_read * TRANSFER_PACKET_LENGTH;
908 devc->read_pos = devc->info.write_pos - devc->n_bytes_to_read;
909 devc->n_reps_until_trigger = devc->info.n_rep_packets_before_trigger;
911 sr_dbg("Want to read %u xfer-packets starting from pos %" PRIu32 ".",
912 devc->n_transfer_packets_to_read, devc->read_pos);
914 if ((ret = ctrl_out(sdi, CMD_BULK_RESET, 0x00, 0, NULL, 0)) != SR_OK) {
915 sr_err("Cannot reset USB bulk state.");
918 sr_dbg("Will read from 0x%08lx, 0x%08x bytes.",
919 (unsigned long)devc->read_pos, devc->n_bytes_to_read);
921 write_u32le_inc(&wrptr, devc->read_pos);
922 write_u32le_inc(&wrptr, devc->n_bytes_to_read);
923 if ((ret = ctrl_out(sdi, CMD_FPGA_SPI, REG_BULK, 0, wrbuf, wrptr - wrbuf)) != SR_OK) {
924 sr_err("Cannot send USB bulk config.");
927 if ((ret = ctrl_out(sdi, CMD_BULK_START, 0x00, 0, NULL, 0)) != SR_OK) {
928 sr_err("Cannot unblock USB bulk transfers.");
933 * Pick a buffer size for all USB transfers. The buffer size
934 * must be a multiple of the endpoint packet size. And cannot
935 * exceed a maximum value.
937 to_read = devc->n_bytes_to_read;
938 if (to_read >= LA2016_USB_BUFSZ) /* Multiple transfers. */
939 to_read = LA2016_USB_BUFSZ;
940 else /* One transfer. */
941 to_read = (to_read + (LA2016_EP6_PKTSZ-1)) & ~(LA2016_EP6_PKTSZ-1);
942 buffer = g_try_malloc(to_read);
944 sr_dbg("USB bulk transfer size %d bytes.", (int)to_read);
945 sr_err("Cannot allocate buffer for USB bulk transfer.");
946 return SR_ERR_MALLOC;
949 devc->transfer = libusb_alloc_transfer(0);
950 libusb_fill_bulk_transfer(devc->transfer,
951 usb->devhdl, USB_EP_CAPTURE_DATA | LIBUSB_ENDPOINT_IN,
953 cb, (void *)sdi, DEFAULT_TIMEOUT_MS);
955 if ((ret = libusb_submit_transfer(devc->transfer)) != 0) {
956 sr_err("Cannot submit USB transfer: %s.", libusb_error_name(ret));
957 libusb_free_transfer(devc->transfer);
958 devc->transfer = NULL;
966 static void send_chunk(struct sr_dev_inst *sdi,
967 const uint8_t *packets, unsigned int num_tfers)
969 struct dev_context *devc;
970 struct sr_datafeed_logic logic;
971 struct sr_datafeed_packet sr_packet;
972 unsigned int max_samples, n_samples, total_samples, free_n_samples;
973 unsigned int i, j, k;
974 int do_signal_trigger;
979 uint8_t sample_buff[sizeof(state)];
983 logic.unitsize = sizeof(sample_buff);
984 logic.data = devc->convbuffer;
986 sr_packet.type = SR_DF_LOGIC;
987 sr_packet.payload = &logic;
989 max_samples = devc->convbuffer_size / sizeof(sample_buff);
991 wp = devc->convbuffer;
993 do_signal_trigger = 0;
995 if (devc->had_triggers_configured && devc->reading_behind_trigger == 0 && devc->info.n_rep_packets_before_trigger == 0) {
996 std_session_send_df_trigger(sdi);
997 devc->reading_behind_trigger = 1;
1001 for (i = 0; i < num_tfers; i++) {
1002 for (k = 0; k < NUM_PACKETS_IN_CHUNK; k++) {
1003 free_n_samples = max_samples - n_samples;
1004 if (free_n_samples < 256 || do_signal_trigger) {
1005 logic.length = n_samples * 2;
1006 sr_session_send(sdi, &sr_packet);
1008 wp = devc->convbuffer;
1009 if (do_signal_trigger) {
1010 std_session_send_df_trigger(sdi);
1011 do_signal_trigger = 0;
1015 state = read_u16le_inc(&rp);
1016 repetitions = read_u8_inc(&rp);
1017 write_u16le((void *)&sample_buff, state);
1018 for (j = 0; j < repetitions; j++) {
1019 memcpy(wp, sample_buff, logic.unitsize);
1020 wp += logic.unitsize;
1023 n_samples += repetitions;
1024 total_samples += repetitions;
1025 devc->total_samples += repetitions;
1026 if (!devc->reading_behind_trigger) {
1027 devc->n_reps_until_trigger--;
1028 if (devc->n_reps_until_trigger == 0) {
1029 devc->reading_behind_trigger = 1;
1030 do_signal_trigger = 1;
1031 sr_dbg("Trigger position after %" PRIu64 " samples, %.6fms.",
1032 devc->total_samples,
1033 (double)devc->total_samples / devc->cur_samplerate * 1e3);
1037 (void)read_u8_inc(&rp); /* Skip sequence number. */
1040 logic.length = n_samples * logic.unitsize;
1041 sr_session_send(sdi, &sr_packet);
1042 if (do_signal_trigger) {
1043 std_session_send_df_trigger(sdi);
1046 sr_dbg("Send_chunk done after %u samples.", total_samples);
1049 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
1051 struct sr_dev_inst *sdi;
1052 struct dev_context *devc;
1053 struct sr_usb_dev_inst *usb;
1056 sdi = transfer->user_data;
1060 sr_dbg("receive_transfer(): status %s received %d bytes.",
1061 libusb_error_name(transfer->status), transfer->actual_length);
1063 if (transfer->status == LIBUSB_TRANSFER_TIMED_OUT) {
1064 sr_err("USB bulk transfer timeout.");
1065 devc->transfer_finished = 1;
1067 send_chunk(sdi, transfer->buffer, transfer->actual_length / TRANSFER_PACKET_LENGTH);
1069 devc->n_bytes_to_read -= transfer->actual_length;
1070 if (devc->n_bytes_to_read) {
1071 uint32_t to_read = devc->n_bytes_to_read;
1073 * Determine read size for the next USB transfer. Make
1074 * the buffer size a multiple of the endpoint packet
1075 * size. Don't exceed a maximum value.
1077 if (to_read >= LA2016_USB_BUFSZ)
1078 to_read = LA2016_USB_BUFSZ;
1080 to_read = (to_read + (LA2016_EP6_PKTSZ-1)) & ~(LA2016_EP6_PKTSZ-1);
1081 libusb_fill_bulk_transfer(transfer,
1082 usb->devhdl, USB_EP_CAPTURE_DATA | LIBUSB_ENDPOINT_IN,
1083 transfer->buffer, to_read,
1084 receive_transfer, (void *)sdi, DEFAULT_TIMEOUT_MS);
1086 if ((ret = libusb_submit_transfer(transfer)) == 0)
1088 sr_err("Cannot submit another USB transfer: %s.",
1089 libusb_error_name(ret));
1092 g_free(transfer->buffer);
1093 libusb_free_transfer(transfer);
1094 devc->transfer_finished = 1;
1097 SR_PRIV int la2016_receive_data(int fd, int revents, void *cb_data)
1099 const struct sr_dev_inst *sdi;
1100 struct dev_context *devc;
1101 struct drv_context *drvc;
1109 drvc = sdi->driver->context;
1111 if (devc->have_trigger == 0) {
1112 if (la2016_has_triggered(sdi) == 0) {
1113 /* Not yet ready for sample data download. */
1116 devc->have_trigger = 1;
1117 devc->transfer_finished = 0;
1118 devc->reading_behind_trigger = 0;
1119 devc->total_samples = 0;
1120 /* We can start downloading sample data. */
1121 if (la2016_start_retrieval(sdi, receive_transfer) != SR_OK) {
1122 sr_err("Cannot start acquisition data download.");
1125 sr_dbg("Acquisition data download started.");
1126 std_session_send_df_frame_begin(sdi);
1131 tv.tv_sec = tv.tv_usec = 0;
1132 libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
1134 if (devc->transfer_finished) {
1135 sr_dbg("Download finished, post processing.");
1136 std_session_send_df_frame_end(sdi);
1138 usb_source_remove(sdi->session, drvc->sr_ctx);
1139 std_session_send_df_end(sdi);
1141 la2016_stop_acquisition(sdi);
1143 g_free(devc->convbuffer);
1144 devc->convbuffer = NULL;
1146 devc->transfer = NULL;
1148 sr_dbg("Download finished, done post processing.");
1154 SR_PRIV int la2016_init_device(const struct sr_dev_inst *sdi)
1156 struct dev_context *devc;
1159 const uint8_t *rdptr;
1160 uint8_t date_yy, date_mm;
1161 uint8_t dinv_yy, dinv_mm;
1163 const char *bitstream_fn;
1169 * Four EEPROM bytes at offset 0x20 are the manufacturing date,
1170 * year and month in BCD format, followed by inverted values for
1171 * consistency checks. For example bytes 20 04 df fb translate
1172 * to 2020-04. This information can help identify the vintage of
1173 * devices when unknown magic numbers are seen.
1175 ret = ctrl_in(sdi, CMD_EEPROM, 0x20, 0, buf, 4 * sizeof(uint8_t));
1177 sr_err("Cannot read manufacture date in EEPROM.");
1180 date_yy = read_u8_inc(&rdptr);
1181 date_mm = read_u8_inc(&rdptr);
1182 dinv_yy = read_u8_inc(&rdptr);
1183 dinv_mm = read_u8_inc(&rdptr);
1184 sr_info("Manufacture date: 20%02hx-%02hx.", date_yy, date_mm);
1185 if ((date_mm ^ dinv_mm) != 0xff || (date_yy ^ dinv_yy) != 0xff)
1186 sr_warn("Manufacture date fails checksum test.");
1190 * Several Kingst logic analyzer devices share the same USB VID
1191 * and PID. The product ID determines which MCU firmware to load.
1192 * The MCU firmware provides access to EEPROM content which then
1193 * allows to identify the device model. Which in turn determines
1194 * which FPGA bitstream to load. Eight bytes at offset 0x08 are
1197 * EEPROM content for model identification is kept redundantly
1198 * in memory. The values are stored in verbatim and in inverted
1199 * form, multiple copies are kept at different offsets. Example
1210 * Exclusively inspecting the magic byte appears to be sufficient,
1211 * other fields seem to be 'don't care'.
1213 * magic 2 == LA2016 using "kingst-la2016-fpga.bitstream"
1214 * magic 3 == LA1016 using "kingst-la1016-fpga.bitstream"
1215 * magic 8 == LA2016a using "kingst-la2016a1-fpga.bitstream"
1216 * (latest v1.3.0 PCB, perhaps others)
1217 * magic 9 == LA1016a using "kingst-la1016a1-fpga.bitstream"
1218 * (latest v1.3.0 PCB, perhaps others)
1220 * When EEPROM content does not match the hardware configuration
1221 * (the board layout), the software may load but yield incorrect
1222 * results (like swapped channels). The FPGA bitstream itself
1223 * will authenticate with IC U10 and fail when its capabilities
1224 * do not match the hardware model. An LA1016 won't become a
1225 * LA2016 by faking its EEPROM content.
1227 if ((ret = ctrl_in(sdi, CMD_EEPROM, 0x08, 0, &buf, sizeof(buf))) != SR_OK) {
1228 sr_err("Cannot read EEPROM device identifier bytes.");
1231 if ((buf[0] ^ buf[1]) == 0xff) {
1232 /* Primary copy of magic passes complement check. */
1233 sr_dbg("Using primary copy of device type magic number.");
1235 } else if ((buf[4] ^ buf[5]) == 0xff) {
1236 /* Backup copy of magic passes complement check. */
1237 sr_dbg("Using backup copy of device type magic number.");
1240 sr_err("Cannot find consistent device type identification.");
1243 sr_dbg("Device type: magic number is %hhu.", magic);
1245 /* Select the FPGA bitstream depending on the model. */
1248 bitstream_fn = FPGA_FW_LA2016;
1249 devc->max_samplerate = MAX_SAMPLE_RATE_LA2016;
1252 bitstream_fn = FPGA_FW_LA1016;
1253 devc->max_samplerate = MAX_SAMPLE_RATE_LA1016;
1256 bitstream_fn = FPGA_FW_LA2016A;
1257 devc->max_samplerate = MAX_SAMPLE_RATE_LA2016;
1260 bitstream_fn = FPGA_FW_LA1016A;
1261 devc->max_samplerate = MAX_SAMPLE_RATE_LA1016;
1264 bitstream_fn = NULL;
1267 if (!bitstream_fn || !*bitstream_fn) {
1268 sr_err("Cannot identify as one of the supported models.");
1272 if (check_fpga_bitstream(sdi) != SR_OK) {
1273 ret = upload_fpga_bitstream(sdi, bitstream_fn);
1275 sr_err("Cannot upload FPGA bitstream.");
1279 ret = enable_fpga_bitstream(sdi);
1281 sr_err("Cannot enable FPGA bitstream after upload.");
1285 state = run_state(sdi);
1286 if (state != 0x85e9) {
1287 sr_warn("Unexpected run state, want 0x85e9, got 0x%04x.", state);
1290 if ((ret = ctrl_out(sdi, CMD_BULK_RESET, 0x00, 0, NULL, 0)) != SR_OK) {
1291 sr_err("Cannot reset USB bulk transfer.");
1295 sr_dbg("Device should be initialized.");
1297 ret = set_defaults(sdi);
1304 SR_PRIV int la2016_deinit_device(const struct sr_dev_inst *sdi)
1308 if ((ret = ctrl_out(sdi, CMD_FPGA_ENABLE, 0x00, 0, NULL, 0)) != SR_OK) {
1309 sr_err("Cannot deinitialize device's FPGA.");