* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <config.h>
+#include <glib.h>
+#include <glib/gstdio.h>
#include "protocol.h"
-/* Protocol commands */
-#define CMD_GET_FW_VERSION 0xb0
-#define CMD_START 0xb1
-#define CMD_GET_REVID_VERSION 0xb2
-
-#define CMD_START_FLAGS_WIDE_POS 5
-#define CMD_START_FLAGS_CLK_SRC_POS 6
-
-#define CMD_START_FLAGS_SAMPLE_8BIT (0 << CMD_START_FLAGS_WIDE_POS)
-#define CMD_START_FLAGS_SAMPLE_16BIT (1 << CMD_START_FLAGS_WIDE_POS)
-
-#define CMD_START_FLAGS_CLK_30MHZ (0 << CMD_START_FLAGS_CLK_SRC_POS)
-#define CMD_START_FLAGS_CLK_48MHZ (1 << CMD_START_FLAGS_CLK_SRC_POS)
-
#pragma pack(push, 1)
struct version_info {
#pragma pack(pop)
+#define USB_TIMEOUT 100
+
static int command_get_fw_version(libusb_device_handle *devhdl,
struct version_info *vi)
{
ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
- (unsigned char *)vi, sizeof(struct version_info), 100);
+ (unsigned char *)vi, sizeof(struct version_info), USB_TIMEOUT);
if (ret < 0) {
sr_err("Unable to get version info: %s.",
ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_ENDPOINT_IN, CMD_GET_REVID_VERSION, 0x0000, 0x0000,
- revid, 1, 100);
+ revid, 1, USB_TIMEOUT);
if (ret < 0) {
sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
return SR_OK;
}
-SR_PRIV int fx2lafw_command_start_acquisition(const struct sr_dev_inst *sdi)
+static int command_start_acquisition(const struct sr_dev_inst *sdi)
{
- struct dev_context *devc = sdi->priv;
- struct sr_usb_dev_inst *usb = sdi->conn;
- libusb_device_handle *devhdl = usb->devhdl;
- uint64_t samplerate = devc->cur_samplerate;
- gboolean samplewide = devc->sample_wide;
- struct cmd_start_acquisition cmd = { 0 };
- int delay = 0, ret;
+ struct dev_context *devc;
+ struct sr_usb_dev_inst *usb;
+ uint64_t samplerate;
+ struct cmd_start_acquisition cmd;
+ int delay, ret;
+
+ devc = sdi->priv;
+ usb = sdi->conn;
+ samplerate = devc->cur_samplerate;
/* Compute the sample rate. */
- if (samplewide && samplerate > MAX_16BIT_SAMPLE_RATE) {
+ if (devc->sample_wide && samplerate > MAX_16BIT_SAMPLE_RATE) {
sr_err("Unable to sample at %" PRIu64 "Hz "
"when collecting 16-bit samples.", samplerate);
return SR_ERR;
}
+ delay = 0;
+ cmd.flags = cmd.sample_delay_h = cmd.sample_delay_l = 0;
if ((SR_MHZ(48) % samplerate) == 0) {
cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
delay = SR_MHZ(48) / samplerate - 1;
delay = SR_MHZ(30) / samplerate - 1;
}
- sr_info("GPIF delay = %d, clocksource = %sMHz.", delay,
+ sr_dbg("GPIF delay = %d, clocksource = %sMHz.", delay,
(cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");
- if (delay <= 0 || delay > MAX_SAMPLE_DELAY) {
+ if (delay < 0 || delay > MAX_SAMPLE_DELAY) {
sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate);
return SR_ERR;
}
cmd.sample_delay_l = delay & 0xff;
/* Select the sampling width. */
- cmd.flags |= samplewide ? CMD_START_FLAGS_SAMPLE_16BIT :
+ cmd.flags |= devc->sample_wide ? CMD_START_FLAGS_SAMPLE_16BIT :
CMD_START_FLAGS_SAMPLE_8BIT;
+ /* Enable CTL2 clock. */
+ cmd.flags |= (g_slist_length(devc->enabled_analog_channels) > 0) ? CMD_START_FLAGS_CLK_CTL2 : 0;
/* Send the control message. */
- ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
+ ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
- (unsigned char *)&cmd, sizeof(cmd), 100);
+ (unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT);
if (ret < 0) {
sr_err("Unable to send start command: %s.",
libusb_error_name(ret));
return SR_OK;
}
-/**
- * Check the USB configuration to determine if this is an fx2lafw device.
- *
- * @return TRUE if the device's configuration profile match fx2lafw
- * configuration, FALSE otherwise.
- */
-SR_PRIV gboolean fx2lafw_check_conf_profile(libusb_device *dev)
-{
- struct libusb_device_descriptor des;
- struct libusb_device_handle *hdl;
- gboolean ret;
- unsigned char strdesc[64];
-
- hdl = NULL;
- ret = FALSE;
- while (!ret) {
- /* Assume the FW has not been loaded, unless proven wrong. */
- if (libusb_get_device_descriptor(dev, &des) != 0)
- break;
-
- if (libusb_open(dev, &hdl) != 0)
- break;
-
- if (libusb_get_string_descriptor_ascii(hdl,
- des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
- break;
- if (strncmp((const char *)strdesc, "sigrok", 6))
- break;
-
- if (libusb_get_string_descriptor_ascii(hdl,
- des.iProduct, strdesc, sizeof(strdesc)) < 0)
- break;
- if (strncmp((const char *)strdesc, "fx2lafw", 7))
- break;
-
- /* If we made it here, it must be an fx2lafw. */
- ret = TRUE;
- }
- if (hdl)
- libusb_close(hdl);
-
- return ret;
-}
-
SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
{
libusb_device **devlist;
struct dev_context *devc;
struct drv_context *drvc;
struct version_info vi;
- int ret, skip, i, device_count;
+ int ret = SR_ERR, i, device_count;
uint8_t revid;
+ char connection_id[64];
- drvc = di->priv;
+ drvc = di->context;
devc = sdi->priv;
usb = sdi->conn;
- if (sdi->status == SR_ST_ACTIVE)
- /* Device is already in use. */
- return SR_ERR;
-
- skip = 0;
device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
if (device_count < 0) {
sr_err("Failed to get device list: %s.",
}
for (i = 0; i < device_count; i++) {
- if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
- sr_err("Failed to get device descriptor: %s.",
- libusb_error_name(ret));
- continue;
- }
+ libusb_get_device_descriptor(devlist[i], &des);
if (des.idVendor != devc->profile->vid
|| des.idProduct != devc->profile->pid)
continue;
- if (sdi->status == SR_ST_INITIALIZING) {
- if (skip != sdi->index) {
- /* Skip devices of this type that aren't the one we want. */
- skip += 1;
- continue;
- }
- } else if (sdi->status == SR_ST_INACTIVE) {
+ if ((sdi->status == SR_ST_INITIALIZING) ||
+ (sdi->status == SR_ST_INACTIVE)) {
/*
- * This device is fully enumerated, so we need to find
- * this device by vendor, product, bus and address.
+ * Check device by its physical USB bus/port address.
*/
- if (libusb_get_bus_number(devlist[i]) != usb->bus
- || libusb_get_device_address(devlist[i]) != usb->address)
+ if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
+ continue;
+
+ if (strcmp(sdi->connection_id, connection_id))
/* This is not the one. */
continue;
}
} else {
sr_err("Failed to open device: %s.",
libusb_error_name(ret));
+ ret = SR_ERR;
break;
}
+ if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
+ if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
+ if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
+ sr_err("Failed to detach kernel driver: %s.",
+ libusb_error_name(ret));
+ ret = SR_ERR;
+ break;
+ }
+ }
+ }
+
ret = command_get_fw_version(usb->devhdl, &vi);
if (ret != SR_OK) {
sr_err("Failed to get firmware version.");
break;
}
- sdi->status = SR_ST_ACTIVE;
- sr_info("Opened device %d on %d.%d, "
+ sr_info("Opened device on %d.%d (logical) / %s (physical), "
"interface %d, firmware %d.%d.",
- sdi->index, usb->bus, usb->address,
+ usb->bus, usb->address, connection_id,
USB_INTERFACE, vi.major, vi.minor);
sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
+ ret = SR_OK;
+
break;
}
- libusb_free_device_list(devlist, 1);
- if (sdi->status != SR_ST_ACTIVE)
- return SR_ERR;
+ libusb_free_device_list(devlist, 1);
- return SR_OK;
+ return ret;
}
SR_PRIV struct dev_context *fx2lafw_dev_new(void)
{
struct dev_context *devc;
- if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
- sr_err("Device context malloc failed.");
- return NULL;
- }
-
+ devc = g_malloc0(sizeof(struct dev_context));
devc->profile = NULL;
+ devc->channel_names = NULL;
devc->fw_updated = 0;
devc->cur_samplerate = 0;
+ devc->limit_frames = 1;
devc->limit_samples = 0;
+ devc->capture_ratio = 0;
devc->sample_wide = FALSE;
+ devc->num_frames = 0;
devc->stl = NULL;
return devc;
static void finish_acquisition(struct sr_dev_inst *sdi)
{
- struct sr_datafeed_packet packet;
struct dev_context *devc;
devc = sdi->priv;
- /* Terminate session. */
- packet.type = SR_DF_END;
- sr_session_send(sdi, &packet);
+ std_session_send_df_end(sdi);
- /* Remove fds from polling. */
usb_source_remove(sdi->session, devc->ctx);
devc->num_transfers = 0;
g_free(devc->transfers);
+ /* Free the deinterlace buffers if we had them. */
+ if (g_slist_length(devc->enabled_analog_channels) > 0) {
+ g_free(devc->logic_buffer);
+ g_free(devc->analog_buffer);
+ }
+
if (devc->stl) {
soft_trigger_logic_free(devc->stl);
devc->stl = NULL;
}
-SR_PRIV void fx2lafw_receive_transfer(struct libusb_transfer *transfer)
+static void mso_send_data_proc(struct sr_dev_inst *sdi,
+ uint8_t *data, size_t length, size_t sample_width)
+{
+ size_t i;
+ struct dev_context *devc;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+
+ (void)sample_width;
+
+ devc = sdi->priv;
+
+ length /= 2;
+
+ /* Send the logic */
+ for (i = 0; i < length; i++) {
+ devc->logic_buffer[i] = data[i * 2];
+ /* Rescale to -10V - +10V from 0-255. */
+ devc->analog_buffer[i] = (data[i * 2 + 1] - 128.0f) / 12.8f;
+ };
+
+ const struct sr_datafeed_logic logic = {
+ .length = length,
+ .unitsize = 1,
+ .data = devc->logic_buffer
+ };
+
+ const struct sr_datafeed_packet logic_packet = {
+ .type = SR_DF_LOGIC,
+ .payload = &logic
+ };
+
+ sr_session_send(sdi, &logic_packet);
+
+ sr_analog_init(&analog, &encoding, &meaning, &spec, 2);
+ analog.meaning->channels = devc->enabled_analog_channels;
+ analog.meaning->mq = SR_MQ_VOLTAGE;
+ analog.meaning->unit = SR_UNIT_VOLT;
+ analog.meaning->mqflags = 0 /* SR_MQFLAG_DC */;
+ analog.num_samples = length;
+ analog.data = devc->analog_buffer;
+
+ const struct sr_datafeed_packet analog_packet = {
+ .type = SR_DF_ANALOG,
+ .payload = &analog
+ };
+
+ sr_session_send(sdi, &analog_packet);
+}
+
+static void la_send_data_proc(struct sr_dev_inst *sdi,
+ uint8_t *data, size_t length, size_t sample_width)
+{
+ const struct sr_datafeed_logic logic = {
+ .length = length,
+ .unitsize = sample_width,
+ .data = data
+ };
+
+ const struct sr_datafeed_packet packet = {
+ .type = SR_DF_LOGIC,
+ .payload = &logic
+ };
+
+ sr_session_send(sdi, &packet);
+}
+
+static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
{
struct sr_dev_inst *sdi;
struct dev_context *devc;
gboolean packet_has_error = FALSE;
- struct sr_datafeed_packet packet;
- struct sr_datafeed_logic logic;
unsigned int num_samples;
- int trigger_offset, cur_sample_count, unitsize;
+ int trigger_offset, cur_sample_count, unitsize, processed_samples;
+ int pre_trigger_samples;
sdi = transfer->user_data;
devc = sdi->priv;
return;
}
- sr_info("receive_transfer(): status %d received %d bytes.",
- transfer->status, transfer->actual_length);
+ sr_dbg("receive_transfer(): status %s received %d bytes.",
+ libusb_error_name(transfer->status), transfer->actual_length);
/* Save incoming transfer before reusing the transfer struct. */
unitsize = devc->sample_wide ? 2 : 1;
cur_sample_count = transfer->actual_length / unitsize;
+ processed_samples = 0;
switch (transfer->status) {
case LIBUSB_TRANSFER_NO_DEVICE:
devc->empty_transfer_count = 0;
}
+check_trigger:
if (devc->trigger_fired) {
- if (devc->sent_samples < devc->limit_samples) {
+ if (!devc->limit_samples || devc->sent_samples < devc->limit_samples) {
/* Send the incoming transfer to the session bus. */
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- if (devc->sent_samples + cur_sample_count > devc->limit_samples)
+ num_samples = cur_sample_count - processed_samples;
+ if (devc->limit_samples && devc->sent_samples + num_samples > devc->limit_samples)
num_samples = devc->limit_samples - devc->sent_samples;
- else
- num_samples = cur_sample_count;
- logic.length = num_samples * unitsize;
- logic.unitsize = unitsize;
- logic.data = transfer->buffer;
- sr_session_send(devc->cb_data, &packet);
+
+ devc->send_data_proc(sdi, (uint8_t *)transfer->buffer + processed_samples * unitsize,
+ num_samples * unitsize, unitsize);
devc->sent_samples += num_samples;
+ processed_samples += num_samples;
}
} else {
trigger_offset = soft_trigger_logic_check(devc->stl,
- transfer->buffer, transfer->actual_length);
+ transfer->buffer + processed_samples * unitsize,
+ transfer->actual_length - processed_samples * unitsize,
+ &pre_trigger_samples);
if (trigger_offset > -1) {
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- num_samples = cur_sample_count - trigger_offset;
+ std_session_send_df_frame_begin(sdi);
+ devc->sent_samples += pre_trigger_samples;
+ num_samples = cur_sample_count - processed_samples - trigger_offset;
if (devc->limit_samples &&
- num_samples > devc->limit_samples - devc->sent_samples)
+ devc->sent_samples + num_samples > devc->limit_samples)
num_samples = devc->limit_samples - devc->sent_samples;
- logic.length = num_samples * unitsize;
- logic.unitsize = unitsize;
- logic.data = transfer->buffer + trigger_offset * unitsize;
- sr_session_send(devc->cb_data, &packet);
+
+ devc->send_data_proc(sdi, (uint8_t *)transfer->buffer
+ + processed_samples * unitsize
+ + trigger_offset * unitsize,
+ num_samples * unitsize, unitsize);
devc->sent_samples += num_samples;
+ processed_samples += trigger_offset + num_samples;
devc->trigger_fired = TRUE;
}
}
- if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) {
+ const int frame_ended = devc->limit_samples && (devc->sent_samples >= devc->limit_samples);
+ const int final_frame = devc->limit_frames && (devc->num_frames >= (devc->limit_frames - 1));
+
+ if (frame_ended) {
+ devc->num_frames++;
+ devc->sent_samples = 0;
+ devc->trigger_fired = FALSE;
+ std_session_send_df_frame_end(sdi);
+
+ /* There may be another trigger in the remaining data, go back and check for it */
+ if (processed_samples < cur_sample_count) {
+ /* Reset the trigger stage */
+ if (devc->stl)
+ devc->stl->cur_stage = 0;
+ else {
+ std_session_send_df_frame_begin(sdi);
+ devc->trigger_fired = TRUE;
+ }
+ if (!final_frame)
+ goto check_trigger;
+ }
+ }
+ if (frame_ended && final_frame) {
fx2lafw_abort_acquisition(devc);
free_transfer(transfer);
} else
resubmit_transfer(transfer);
}
+static int configure_channels(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ const GSList *l;
+ int p;
+ struct sr_channel *ch;
+ uint32_t channel_mask = 0, num_analog = 0;
+
+ devc = sdi->priv;
+
+ g_slist_free(devc->enabled_analog_channels);
+ devc->enabled_analog_channels = NULL;
+
+ for (l = sdi->channels, p = 0; l; l = l->next, p++) {
+ ch = l->data;
+ if ((p <= NUM_CHANNELS) && (ch->type == SR_CHANNEL_ANALOG)
+ && (ch->enabled)) {
+ num_analog++;
+ devc->enabled_analog_channels =
+ g_slist_append(devc->enabled_analog_channels, ch);
+ } else {
+ channel_mask |= ch->enabled << p;
+ }
+ }
+
+ /*
+ * Use wide sampling if either any of the LA channels 8..15 is enabled,
+ * and/or at least one analog channel is enabled.
+ */
+ devc->sample_wide = channel_mask > 0xff || num_analog > 0;
+
+ return SR_OK;
+}
+
static unsigned int to_bytes_per_ms(unsigned int samplerate)
{
return samplerate / 1000;
}
-SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc)
+static size_t get_buffer_size(struct dev_context *devc)
{
size_t s;
return (s + 511) & ~511;
}
-SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc)
+static unsigned int get_number_of_transfers(struct dev_context *devc)
{
unsigned int n;
/* Total buffer size should be able to hold about 500ms of data. */
n = (500 * to_bytes_per_ms(devc->cur_samplerate) /
- fx2lafw_get_buffer_size(devc));
+ get_buffer_size(devc));
if (n > NUM_SIMUL_TRANSFERS)
return NUM_SIMUL_TRANSFERS;
return n;
}
-SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc)
+static unsigned int get_timeout(struct dev_context *devc)
{
size_t total_size;
unsigned int timeout;
- total_size = fx2lafw_get_buffer_size(devc) *
- fx2lafw_get_number_of_transfers(devc);
+ total_size = get_buffer_size(devc) *
+ get_number_of_transfers(devc);
timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
}
+
+static int receive_data(int fd, int revents, void *cb_data)
+{
+ struct timeval tv;
+ struct drv_context *drvc;
+
+ (void)fd;
+ (void)revents;
+
+ drvc = (struct drv_context *)cb_data;
+
+ tv.tv_sec = tv.tv_usec = 0;
+ libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
+
+ return TRUE;
+}
+
+static int start_transfers(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct sr_usb_dev_inst *usb;
+ struct sr_trigger *trigger;
+ struct libusb_transfer *transfer;
+ unsigned int i, num_transfers;
+ int timeout, ret;
+ unsigned char *buf;
+ size_t size;
+
+ devc = sdi->priv;
+ usb = sdi->conn;
+
+ devc->sent_samples = 0;
+ devc->acq_aborted = FALSE;
+ devc->empty_transfer_count = 0;
+
+ if ((trigger = sr_session_trigger_get(sdi->session))) {
+ int pre_trigger_samples = 0;
+ if (devc->limit_samples > 0)
+ pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
+ devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
+ if (!devc->stl)
+ return SR_ERR_MALLOC;
+ devc->trigger_fired = FALSE;
+ } else {
+ std_session_send_df_frame_begin(sdi);
+ devc->trigger_fired = TRUE;
+ }
+
+ num_transfers = get_number_of_transfers(devc);
+
+ size = get_buffer_size(devc);
+ devc->submitted_transfers = 0;
+
+ devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
+ if (!devc->transfers) {
+ sr_err("USB transfers malloc failed.");
+ return SR_ERR_MALLOC;
+ }
+
+ timeout = get_timeout(devc);
+ devc->num_transfers = num_transfers;
+ for (i = 0; i < num_transfers; i++) {
+ if (!(buf = g_try_malloc(size))) {
+ sr_err("USB transfer buffer malloc failed.");
+ return SR_ERR_MALLOC;
+ }
+ transfer = libusb_alloc_transfer(0);
+ libusb_fill_bulk_transfer(transfer, usb->devhdl,
+ 2 | LIBUSB_ENDPOINT_IN, buf, size,
+ receive_transfer, (void *)sdi, timeout);
+ sr_info("submitting transfer: %d", i);
+ if ((ret = libusb_submit_transfer(transfer)) != 0) {
+ sr_err("Failed to submit transfer: %s.",
+ libusb_error_name(ret));
+ libusb_free_transfer(transfer);
+ g_free(buf);
+ fx2lafw_abort_acquisition(devc);
+ return SR_ERR;
+ }
+ devc->transfers[i] = transfer;
+ devc->submitted_transfers++;
+ }
+
+ /*
+ * If this device has analog channels and at least one of them is
+ * enabled, use mso_send_data_proc() to properly handle the analog
+ * data. Otherwise use la_send_data_proc().
+ */
+ if (g_slist_length(devc->enabled_analog_channels) > 0)
+ devc->send_data_proc = mso_send_data_proc;
+ else
+ devc->send_data_proc = la_send_data_proc;
+
+ std_session_send_df_header(sdi);
+
+ return SR_OK;
+}
+
+SR_PRIV int fx2lafw_start_acquisition(const struct sr_dev_inst *sdi)
+{
+ struct sr_dev_driver *di;
+ struct drv_context *drvc;
+ struct dev_context *devc;
+ int timeout, ret;
+ size_t size;
+
+ di = sdi->driver;
+ drvc = di->context;
+ devc = sdi->priv;
+
+ devc->ctx = drvc->sr_ctx;
+ devc->num_frames = 0;
+ devc->sent_samples = 0;
+ devc->empty_transfer_count = 0;
+ devc->acq_aborted = FALSE;
+
+ if (configure_channels(sdi) != SR_OK) {
+ sr_err("Failed to configure channels.");
+ return SR_ERR;
+ }
+
+ timeout = get_timeout(devc);
+ usb_source_add(sdi->session, devc->ctx, timeout, receive_data, drvc);
+
+ size = get_buffer_size(devc);
+ /* Prepare for analog sampling. */
+ if (g_slist_length(devc->enabled_analog_channels) > 0) {
+ /* We need a buffer half the size of a transfer. */
+ devc->logic_buffer = g_try_malloc(size / 2);
+ devc->analog_buffer = g_try_malloc(
+ sizeof(float) * size / 2);
+ }
+ start_transfers(sdi);
+ if ((ret = command_start_acquisition(sdi)) != SR_OK) {
+ fx2lafw_abort_acquisition(devc);
+ return ret;
+ }
+
+ return SR_OK;
+}