+++ /dev/null
-/*
- * This file is part of the libsigrok project.
- *
- * Copyright (C) 2013 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"
-
-/*
- * Logic level thresholds.
- *
- * For each of the two channel groups (1-4 and 5-9), the logic level
- * threshold can be set independently.
- *
- * The threshold can be set to values that are usable for systems with
- * different voltage levels, e.g. for 1.8V or 3.3V systems.
- *
- * The actual threshold value is always the middle of the values below.
- * E.g. for a system voltage level of 1.8V, the threshold is at 0.9V. That
- * means that values <= 0.9V are considered to be a logic 0/low, and
- * values > 0.9V are considered to be a logic 1/high.
- *
- * - 1.2V system: threshold = 0.6V
- * - 1.5V system: threshold = 0.75V
- * - 1.8V system: threshold = 0.9V
- * - 2.8V system: threshold = 1.4V
- * - 3.3V system: threshold = 1.65V
- */
-#define THRESHOLD_1_2V_SYSTEM 0x2e
-#define THRESHOLD_1_5V_SYSTEM 0x39
-#define THRESHOLD_1_8V_SYSTEM 0x45
-#define THRESHOLD_2_8V_SYSTEM 0x6c
-#define THRESHOLD_3_3V_SYSTEM 0x7f
-
-static int scanaplus_write(struct dev_context *devc, uint8_t *buf, int size)
-{
- int i, bytes_written;
- GString *s;
-
- /* Note: Caller checks devc, devc->ftdic, buf, size. */
-
- s = g_string_sized_new(100);
- g_string_printf(s, "Writing %d bytes: ", size);
- for (i = 0; i < size; i++)
- g_string_append_printf(s, "0x%02x ", buf[i]);
- sr_spew("%s", s->str);
- g_string_free(s, TRUE);
-
- bytes_written = ftdi_write_data(devc->ftdic, buf, size);
- if (bytes_written < 0) {
- sr_err("Failed to write FTDI data (%d): %s.",
- bytes_written, ftdi_get_error_string(devc->ftdic));
- } else if (bytes_written != size) {
- sr_err("FTDI write error, only %d/%d bytes written: %s.",
- bytes_written, size, ftdi_get_error_string(devc->ftdic));
- }
-
- return bytes_written;
-}
-
-SR_PRIV int scanaplus_close(struct dev_context *devc)
-{
- int ret;
-
- /* Note: Caller checks devc and 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));
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-static void scanaplus_uncompress_block(struct dev_context *devc,
- uint64_t num_bytes)
-{
- uint64_t i, j;
- uint8_t num_samples, low, high;
-
- for (i = 0; i < num_bytes; i += 2) {
- num_samples = devc->compressed_buf[i + 0] >> 1;
-
- low = devc->compressed_buf[i + 0] & (1 << 0);
- high = devc->compressed_buf[i + 1];
-
- for (j = 0; j < num_samples; j++) {
- devc->sample_buf[devc->bytes_received++] = high;
- devc->sample_buf[devc->bytes_received++] = low;
- }
- }
-}
-
-static void send_samples(struct dev_context *devc, uint64_t samples_to_send)
-{
- struct sr_datafeed_packet packet;
- struct sr_datafeed_logic logic;
-
- sr_spew("Sending %" PRIu64 " samples.", samples_to_send);
-
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = samples_to_send * 2;
- logic.unitsize = 2; /* We need 2 bytes for 9 channels. */
- logic.data = devc->sample_buf;
- sr_session_send(devc->cb_data, &packet);
-
- devc->samples_sent += samples_to_send;
- devc->bytes_received -= samples_to_send * 2;
-}
-
-SR_PRIV int scanaplus_get_device_id(struct dev_context *devc)
-{
- int ret;
- uint16_t val1, val2;
-
- /* FTDI EEPROM indices 16+17 contain the 3 device ID bytes. */
- if ((ret = ftdi_read_eeprom_location(devc->ftdic, 16, &val1)) < 0) {
- sr_err("Failed to read EEPROM index 16 (%d): %s.",
- ret, ftdi_get_error_string(devc->ftdic));
- return SR_ERR;
- }
- if ((ret = ftdi_read_eeprom_location(devc->ftdic, 17, &val2)) < 0) {
- sr_err("Failed to read EEPROM index 17 (%d): %s.",
- ret, ftdi_get_error_string(devc->ftdic));
- return SR_ERR;
- }
-
- /*
- * Note: Bit 7 of the three bytes must not be used, apparently.
- *
- * Even though the three bits can be either 0 or 1 (we've seen both
- * in actual ScanaPLUS devices), the device ID as sent to the FPGA
- * has bit 7 of each byte zero'd out.
- *
- * It is unknown whether bit 7 of these bytes has any meaning,
- * whether it's used somewhere, or whether it can be simply ignored.
- */
- devc->devid[0] = ((val1 >> 0) & 0xff) & ~(1 << 7);
- devc->devid[1] = ((val1 >> 8) & 0xff) & ~(1 << 7);
- devc->devid[2] = ((val2 >> 0) & 0xff) & ~(1 << 7);
-
- return SR_OK;
-}
-
-static int scanaplus_clear_device_id(struct dev_context *devc)
-{
- uint8_t buf[2];
-
- buf[0] = 0x8c;
- buf[1] = 0x00;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x8e;
- buf[1] = 0x00;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x8f;
- buf[1] = 0x00;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- return SR_OK;
-}
-
-static int scanaplus_send_device_id(struct dev_context *devc)
-{
- uint8_t buf[2];
-
- buf[0] = 0x8c;
- buf[1] = devc->devid[0];
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x8e;
- buf[1] = devc->devid[1];
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x8f;
- buf[1] = devc->devid[2];
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- return SR_OK;
-}
-
-SR_PRIV int scanaplus_init(struct dev_context *devc)
-{
- int i;
- uint8_t buf[8];
-
- buf[0] = 0x88;
- buf[1] = 0x41;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x89;
- buf[1] = 0x64;
- buf[2] = 0x8a;
- buf[3] = 0x64;
- if (scanaplus_write(devc, (uint8_t *)&buf, 4) < 0)
- return SR_ERR;
-
- buf[0] = 0x88;
- buf[1] = 0x41;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x88;
- buf[1] = 0x40;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x8d;
- buf[1] = 0x01;
- buf[2] = 0x8d;
- buf[3] = 0x05;
- buf[4] = 0x8d;
- buf[5] = 0x01;
- buf[6] = 0x8d;
- buf[7] = 0x02;
- if (scanaplus_write(devc, (uint8_t *)&buf, 8) < 0)
- return SR_ERR;
-
- for (i = 0; i < 57; i++) {
- buf[0] = 0x8d;
- buf[1] = 0x06;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- buf[0] = 0x8d;
- buf[1] = 0x02;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
- }
-
- if (scanaplus_send_device_id(devc) < 0)
- return SR_ERR;
-
- buf[0] = 0x88;
- buf[1] = 0x40;
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- return SR_OK;
-}
-
-SR_PRIV int scanaplus_start_acquisition(struct dev_context *devc)
-{
- uint8_t buf[4];
-
- /* Threshold and differential channel settings not yet implemented. */
-
- buf[0] = 0x89;
- buf[1] = 0x7f; /* Logic level threshold for channels 1-4. */
- buf[2] = 0x8a;
- buf[3] = 0x7f; /* Logic level threshold for channels 5-9. */
- if (scanaplus_write(devc, (uint8_t *)&buf, 4) < 0)
- return SR_ERR;
-
- buf[0] = 0x88;
- buf[1] = 0x40; /* Special config of channels 5/6 and 7/8. */
- /* 0x40: normal, 0x50: ch56 diff, 0x48: ch78 diff, 0x58: ch5678 diff */
- if (scanaplus_write(devc, (uint8_t *)&buf, 2) < 0)
- return SR_ERR;
-
- if (scanaplus_clear_device_id(devc) < 0)
- return SR_ERR;
-
- if (scanaplus_send_device_id(devc) < 0)
- return SR_ERR;
-
- return SR_OK;
-}
-
-SR_PRIV int scanaplus_receive_data(int fd, int revents, void *cb_data)
-{
- int bytes_read;
- struct sr_dev_inst *sdi;
- struct dev_context *devc;
- uint64_t max, n;
-
- (void)fd;
- (void)revents;
-
- if (!(sdi = cb_data))
- return TRUE;
-
- if (!(devc = sdi->priv))
- return TRUE;
-
- if (!devc->ftdic)
- return TRUE;
-
- /* Get a block of data. */
- bytes_read = ftdi_read_data(devc->ftdic, devc->compressed_buf,
- COMPRESSED_BUF_SIZE);
- if (bytes_read < 0) {
- sr_err("Failed to read FTDI data (%d): %s.",
- bytes_read, ftdi_get_error_string(devc->ftdic));
- sdi->driver->dev_acquisition_stop(sdi, sdi);
- return FALSE;
- }
- if (bytes_read == 0) {
- sr_spew("Received 0 bytes, nothing to do.");
- return TRUE;
- }
-
- /*
- * After a ScanaPLUS acquisition starts, a bunch of samples will be
- * returned as all-zero, no matter which signals are actually present
- * on the channels. This is probably due to the FPGA reconfiguring some
- * of its internal state/config during this time.
- *
- * As far as we know there is apparently no way for the PC-side to
- * know when this "reconfiguration" starts or ends. The FTDI chip
- * will return all-zero "dummy" samples during this time, which is
- * indistinguishable from actual all-zero samples.
- *
- * We currently simply ignore the first 64kB of data after an
- * acquisition starts. Empirical tests have shown that the
- * "reconfigure" time is a lot less than that usually.
- */
- if (devc->compressed_bytes_ignored < COMPRESSED_BUF_SIZE) {
- /* Ignore the first 64kB of data of every acquisition. */
- sr_spew("Ignoring first 64kB chunk of data.");
- devc->compressed_bytes_ignored += COMPRESSED_BUF_SIZE;
- return TRUE;
- }
-
- /* TODO: Handle bytes_read which is not a multiple of 2? */
- scanaplus_uncompress_block(devc, bytes_read);
-
- n = devc->samples_sent + (devc->bytes_received / 2);
- max = (SR_MHZ(100) / 1000) * devc->limit_msec;
-
- if (devc->limit_samples && (n >= devc->limit_samples)) {
- send_samples(devc, devc->limit_samples - devc->samples_sent);
- sr_info("Requested number of samples reached.");
- sdi->driver->dev_acquisition_stop(sdi, cb_data);
- return TRUE;
- } else if (devc->limit_msec && (n >= max)) {
- send_samples(devc, max - devc->samples_sent);
- sr_info("Requested time limit reached.");
- sdi->driver->dev_acquisition_stop(sdi, cb_data);
- return TRUE;
- } else {
- send_samples(devc, devc->bytes_received / 2);
- }
-
- return TRUE;
-}
projects / libsigrok.git / blobdiff