+++ /dev/null
-/*
- * This file is part of the libsigrok project.
- *
- * Copyright (C) 2011-2014 Uwe Hermann <uwe@hermann-uwe.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "protocol.h"
-
-SR_PRIV const struct cv_profile cv_profiles[] = {
- { CHRONOVU_LA8, "LA8", "ChronoVu LA8", 8, SR_MHZ(100), "01",
- 0.8388608 },
- { CHRONOVU_LA16, "LA16", "ChronoVu LA16", 16, SR_MHZ(200), "01rf",
- 0.042 },
- { 0, NULL, NULL, 0, 0, NULL, 0.0 },
-};
-
-/* LA8: channels are numbered 0-7. LA16: channels are numbered 0-15. */
-SR_PRIV const char *cv_channel_names[] = {
- "0", "1", "2", "3", "4", "5", "6", "7",
- "8", "9", "10", "11", "12", "13", "14", "15",
-};
-
-static int close_usb_reset_sequencer(struct dev_context *devc);
-
-SR_PRIV void cv_fill_samplerates_if_needed(const struct sr_dev_inst *sdi)
-{
- int i;
- struct dev_context *devc;
-
- devc = sdi->priv;
-
- if (devc->samplerates[0] != 0)
- return;
-
- for (i = 0; i < 255; i++)
- devc->samplerates[254 - i] = devc->prof->max_samplerate / (i + 1);
-}
-
-/**
- * Check if the given samplerate is supported by the hardware.
- *
- * @param sdi Device instance.
- * @param samplerate The samplerate (in Hz) to check.
- *
- * @return 1 if the samplerate is supported/valid, 0 otherwise.
- */
-static int is_valid_samplerate(const struct sr_dev_inst *sdi,
- uint64_t samplerate)
-{
- int i;
- struct dev_context *devc;
-
- devc = sdi->priv;
-
- cv_fill_samplerates_if_needed(sdi);
-
- for (i = 0; i < 255; i++) {
- if (devc->samplerates[i] == samplerate)
- return 1;
- }
-
- sr_err("Invalid samplerate (%" PRIu64 "Hz).", samplerate);
-
- return 0;
-}
-
-/**
- * Convert a samplerate (in Hz) to the 'divcount' value the device wants.
- *
- * The divcount value can be 0x00 - 0xfe (0xff is not valid).
- *
- * LA8:
- * sample period = (divcount + 1) * 10ns.
- * divcount = 0x00: 10ns period, 100MHz samplerate.
- * divcount = 0xfe: 2550ns period, 392.15kHz samplerate.
- *
- * LA16:
- * sample period = (divcount + 1) * 5ns.
- * divcount = 0x00: 5ns period, 200MHz samplerate.
- * divcount = 0xfe: 1275ns period, ~784.31kHz samplerate.
- *
- * @param sdi Device instance.
- * @param samplerate The samplerate in Hz.
- *
- * @return The divcount value as needed by the hardware, or 0xff upon errors.
- */
-SR_PRIV uint8_t cv_samplerate_to_divcount(const struct sr_dev_inst *sdi,
- uint64_t samplerate)
-{
- struct dev_context *devc;
-
- devc = sdi->priv;
-
- if (samplerate == 0) {
- sr_err("Can't convert invalid samplerate of 0 Hz.");
- return 0xff;
- }
-
- if (!is_valid_samplerate(sdi, samplerate)) {
- sr_err("Can't get divcount, samplerate invalid.");
- return 0xff;
- }
-
- return (devc->prof->max_samplerate / samplerate) - 1;
-}
-
-/**
- * Write data of a certain length to the FTDI device.
- *
- * @param devc The struct containing private per-device-instance data. Must not
- * be NULL. devc->ftdic must not be NULL either.
- * @param buf The buffer containing the data to write. Must not be NULL.
- * @param size The number of bytes to write. Must be > 0.
- *
- * @return The number of bytes written, or a negative value upon errors.
- */
-SR_PRIV int cv_write(struct dev_context *devc, uint8_t *buf, int size)
-{
- int bytes_written;
-
- /* Note: Caller ensures devc/devc->ftdic/buf != NULL and size > 0. */
-
- bytes_written = ftdi_write_data(devc->ftdic, buf, size);
-
- if (bytes_written < 0) {
- sr_err("Failed to write data (%d): %s.",
- bytes_written, ftdi_get_error_string(devc->ftdic));
- (void) close_usb_reset_sequencer(devc); /* Ignore errors. */
- } else if (bytes_written != size) {
- sr_err("Failed to write data, only %d/%d bytes written.",
- size, bytes_written);
- (void) close_usb_reset_sequencer(devc); /* Ignore errors. */
- }
-
- return bytes_written;
-}
-
-/**
- * Read a certain amount of bytes from the FTDI device.
- *
- * @param devc The struct containing private per-device-instance data. Must not
- * be NULL. devc->ftdic must not be NULL either.
- * @param buf The buffer where the received data will be stored. Must not
- * be NULL.
- * @param size The number of bytes to read. Must be >= 1.
- *
- * @return The number of bytes read, or a negative value upon errors.
- */
-static int cv_read(struct dev_context *devc, uint8_t *buf, int size)
-{
- int bytes_read;
-
- /* Note: Caller ensures devc/devc->ftdic/buf != NULL and size > 0. */
-
- bytes_read = ftdi_read_data(devc->ftdic, buf, size);
-
- if (bytes_read < 0) {
- sr_err("Failed to read data (%d): %s.",
- bytes_read, ftdi_get_error_string(devc->ftdic));
- } else if (bytes_read != size) {
- // sr_err("Failed to read data, only %d/%d bytes read.",
- // bytes_read, size);
- }
-
- return bytes_read;
-}
-
-/**
- * Close the USB port and reset the sequencer logic.
- *
- * @param devc The struct containing private per-device-instance data.
- *
- * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
- */
-static int close_usb_reset_sequencer(struct dev_context *devc)
-{
- /* Magic sequence of bytes for resetting the sequencer logic. */
- uint8_t buf[8] = {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01};
- int ret;
-
- /* Note: Caller checked that devc and devc->ftdic != NULL. */
-
- if (devc->ftdic->usb_dev) {
- /* Reset the sequencer logic, then wait 100ms. */
- sr_dbg("Resetting sequencer logic.");
- (void) cv_write(devc, buf, 8); /* Ignore errors. */
- g_usleep(100 * 1000);
-
- /* Purge FTDI buffers, then reset and close the FTDI device. */
- sr_dbg("Purging buffers, resetting+closing FTDI device.");
-
- /* Log errors, but ignore them (i.e., don't abort). */
- if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0)
- sr_err("Failed to purge FTDI buffers (%d): %s.",
- ret, ftdi_get_error_string(devc->ftdic));
- if ((ret = ftdi_usb_reset(devc->ftdic)) < 0)
- sr_err("Failed to reset FTDI device (%d): %s.",
- ret, ftdi_get_error_string(devc->ftdic));
- if ((ret = ftdi_usb_close(devc->ftdic)) < 0)
- sr_err("Failed to close FTDI device (%d): %s.",
- ret, ftdi_get_error_string(devc->ftdic));
- }
-
- /* Close USB device, deinitialize and free the FTDI context. */
- ftdi_free(devc->ftdic);
- devc->ftdic = NULL;
-
- return SR_OK;
-}
-
-/**
- * Reset the ChronoVu device.
- *
- * A reset is required after a failed read/write operation or upon timeouts.
- *
- * @param devc The struct containing private per-device-instance data.
- *
- * @return SR_OK upon success, SR_ERR upon failure.
- */
-static int reset_device(struct dev_context *devc)
-{
- uint8_t buf[BS];
- gint64 done, now;
- int bytes_read;
-
- /* Note: Caller checked that devc and devc->ftdic != NULL. */
-
- sr_dbg("Resetting the device.");
-
- /*
- * Purge pending read data from the FTDI hardware FIFO until
- * no more data is left, or a timeout occurs (after 20s).
- */
- done = (20 * G_TIME_SPAN_SECOND) + g_get_monotonic_time();
- do {
- /* Try to read bytes until none are left (or errors occur). */
- bytes_read = cv_read(devc, (uint8_t *)&buf, BS);
- now = g_get_monotonic_time();
- } while ((done > now) && (bytes_read > 0));
-
- /* Reset the sequencer logic and close the USB port. */
- (void) close_usb_reset_sequencer(devc); /* Ignore errors. */
-
- sr_dbg("Device reset finished.");
-
- return SR_OK;
-}
-
-SR_PRIV int cv_configure_channels(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- const struct sr_channel *ch;
- const GSList *l;
- uint16_t channel_bit;
- char *tc;
-
- devc = sdi->priv;
- devc->trigger_pattern = 0x0000; /* Default to "low" trigger. */
- devc->trigger_mask = 0x0000; /* Default to "don't care". */
- devc->trigger_edgemask = 0x0000; /* Default to "state triggered". */
-
- for (l = sdi->channels; l; l = l->next) {
- ch = (struct sr_channel *)l->data;
-
- if (!ch) {
- sr_err("%s: channel was NULL.", __func__);
- return SR_ERR;
- }
-
- /* Skip disabled channels. */
- if (!ch->enabled)
- continue;
-
- /* Skip (enabled) channels with no configured trigger. */
- if (!ch->trigger)
- continue;
-
- /* Note: Must only be run if ch->trigger != NULL. */
- if (ch->index < 0 || ch->index > (int)devc->prof->num_channels - 1) {
- sr_err("Invalid channel index %d, must be "
- "between 0 and %d.", ch->index,
- devc->prof->num_channels - 1);
- return SR_ERR;
- }
-
- channel_bit = (1 << (ch->index));
-
- /* Configure the channel's trigger pattern/mask/edgemask. */
- for (tc = ch->trigger; tc && *tc; tc++) {
- devc->trigger_mask |= channel_bit;
-
- /* Sanity check, LA8 only supports low/high trigger. */
- if ((devc->prof->model == CHRONOVU_LA8) &&
- (*tc != '0' && *tc != '1')) {
- sr_err("Invalid trigger '%c', only "
- "'0'/'1' supported.", *tc);
- return SR_ERR;
- }
-
- /* state: 1 == high, edge: 1 == rising edge. */
- if (*tc == '1' || *tc == 'r')
- devc->trigger_pattern |= channel_bit;
-
- /* LA16 (but not LA8) supports edge triggering. */
- if ((devc->prof->model == CHRONOVU_LA16)) {
- if (*tc == 'r' || *tc == 'f')
- devc->trigger_edgemask |= channel_bit;
- }
-
- }
- }
-
- sr_dbg("Trigger pattern/mask/edgemask = 0x%04x / 0x%04x / 0x%04x.",
- devc->trigger_pattern, devc->trigger_mask,
- devc->trigger_edgemask);
-
- return SR_OK;
-}
-
-SR_PRIV int cv_set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate)
-{
- struct dev_context *devc;
-
- /* Note: Caller checked that sdi and sdi->priv != NULL. */
-
- devc = sdi->priv;
-
- sr_spew("Trying to set samplerate to %" PRIu64 "Hz.", samplerate);
-
- cv_fill_samplerates_if_needed(sdi);
-
- /* Check if this is a samplerate supported by the hardware. */
- if (!is_valid_samplerate(sdi, samplerate)) {
- sr_dbg("Failed to set invalid samplerate (%" PRIu64 "Hz).",
- samplerate);
- return SR_ERR;
- }
-
- devc->cur_samplerate = samplerate;
-
- sr_dbg("Samplerate set to %" PRIu64 "Hz.", devc->cur_samplerate);
-
- return SR_OK;
-}
-
-/**
- * Get a block of data from the device.
- *
- * @param devc The struct containing private per-device-instance data. Must not
- * be NULL. devc->ftdic must not be NULL either.
- *
- * @return SR_OK upon success, or SR_ERR upon errors.
- */
-SR_PRIV int cv_read_block(struct dev_context *devc)
-{
- int i, byte_offset, m, mi, p, q, index, bytes_read;
- gint64 now;
-
- /* Note: Caller checked that devc and devc->ftdic != NULL. */
-
- sr_spew("Reading block %d.", devc->block_counter);
-
- bytes_read = cv_read(devc, devc->mangled_buf, BS);
-
- /* If first block read got 0 bytes, retry until success or timeout. */
- if ((bytes_read == 0) && (devc->block_counter == 0)) {
- do {
- sr_spew("Reading block 0 (again).");
- /* Note: If bytes_read < 0 cv_read() will log errors. */
- bytes_read = cv_read(devc, devc->mangled_buf, BS);
- now = g_get_monotonic_time();
- } while ((devc->done > now) && (bytes_read == 0));
- }
-
- /* Check if block read was successful or a timeout occured. */
- if (bytes_read != BS) {
- sr_err("Trigger timed out. Bytes read: %d.", bytes_read);
- (void) reset_device(devc); /* Ignore errors. */
- return SR_ERR;
- }
-
- /* De-mangle the data. */
- sr_spew("Demangling block %d.", devc->block_counter);
- byte_offset = devc->block_counter * BS;
- m = byte_offset / (1024 * 1024);
- mi = m * (1024 * 1024);
- for (i = 0; i < BS; i++) {
- if (devc->prof->model == CHRONOVU_LA8) {
- p = i & (1 << 0);
- index = m * 2 + (((byte_offset + i) - mi) / 2) * 16;
- index += (devc->divcount == 0) ? p : (1 - p);
- } else {
- p = i & (1 << 0);
- q = i & (1 << 1);
- index = m * 4 + (((byte_offset + i) - mi) / 4) * 32;
- index += q + (1 - p);
- }
- devc->final_buf[index] = devc->mangled_buf[i];
- }
-
- return SR_OK;
-}
-
-SR_PRIV void cv_send_block_to_session_bus(struct dev_context *devc, int block)
-{
- int i;
- uint8_t sample, expected_sample;
- struct sr_datafeed_packet packet;
- struct sr_datafeed_logic logic;
- int trigger_point; /* Relative trigger point (in this block). */
-
- /* Note: Caller ensures devc/devc->ftdic != NULL and block > 0. */
-
- /* TODO: Implement/test proper trigger support for the LA16. */
-
- /* Check if we can find the trigger condition in this block. */
- trigger_point = -1;
- expected_sample = devc->trigger_pattern & devc->trigger_mask;
- for (i = 0; i < BS; i++) {
- /* Don't continue if the trigger was found previously. */
- if (devc->trigger_found)
- break;
-
- /*
- * Also, don't continue if triggers are "don't care", i.e. if
- * no trigger conditions were specified by the user. In that
- * case we don't want to send an SR_DF_TRIGGER packet at all.
- */
- if (devc->trigger_mask == 0x0000)
- break;
-
- sample = *(devc->final_buf + (block * BS) + i);
-
- if ((sample & devc->trigger_mask) == expected_sample) {
- trigger_point = i;
- devc->trigger_found = 1;
- break;
- }
- }
-
- /* If no trigger was found, send one SR_DF_LOGIC packet. */
- if (trigger_point == -1) {
- /* Send an SR_DF_LOGIC packet to the session bus. */
- sr_spew("Sending SR_DF_LOGIC packet (%d bytes) for "
- "block %d.", BS, block);
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = BS;
- logic.unitsize = devc->prof->num_channels / 8;
- logic.data = devc->final_buf + (block * BS);
- sr_session_send(devc->cb_data, &packet);
- return;
- }
-
- /*
- * We found the trigger, so some special handling is needed. We have
- * to send an SR_DF_LOGIC packet with the samples before the trigger
- * (if any), then the SD_DF_TRIGGER packet itself, then another
- * SR_DF_LOGIC packet with the samples after the trigger (if any).
- */
-
- /* TODO: Send SR_DF_TRIGGER packet before or after the actual sample? */
-
- /* If at least one sample is located before the trigger... */
- if (trigger_point > 0) {
- /* Send pre-trigger SR_DF_LOGIC packet to the session bus. */
- sr_spew("Sending pre-trigger SR_DF_LOGIC packet, "
- "start = %d, length = %d.", block * BS, trigger_point);
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = trigger_point;
- logic.unitsize = devc->prof->num_channels / 8;
- logic.data = devc->final_buf + (block * BS);
- sr_session_send(devc->cb_data, &packet);
- }
-
- /* Send the SR_DF_TRIGGER packet to the session bus. */
- sr_spew("Sending SR_DF_TRIGGER packet, sample = %d.",
- (block * BS) + trigger_point);
- packet.type = SR_DF_TRIGGER;
- packet.payload = NULL;
- sr_session_send(devc->cb_data, &packet);
-
- /* If at least one sample is located after the trigger... */
- if (trigger_point < (BS - 1)) {
- /* Send post-trigger SR_DF_LOGIC packet to the session bus. */
- sr_spew("Sending post-trigger SR_DF_LOGIC packet, "
- "start = %d, length = %d.",
- (block * BS) + trigger_point, BS - trigger_point);
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = BS - trigger_point;
- logic.unitsize = devc->prof->num_channels / 8;
- logic.data = devc->final_buf + (block * BS) + trigger_point;
- sr_session_send(devc->cb_data, &packet);
- }
-}
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