return SR_OK;
}
+static void LIBUSB_CALL receive_transfer(struct libusb_transfer *xfer);
+
+static void la2016_usbxfer_release_cb(gpointer p)
+{
+ struct libusb_transfer *xfer;
+
+ xfer = p;
+ g_free(xfer->buffer);
+ libusb_free_transfer(xfer);
+}
+
+static int la2016_usbxfer_release(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+
+ devc = sdi ? sdi->priv : NULL;
+ if (!devc)
+ return SR_ERR_ARG;
+
+ /* Release all USB transfers. */
+ g_slist_free_full(devc->transfers, la2016_usbxfer_release_cb);
+ devc->transfers = NULL;
+
+ return SR_OK;
+}
+
+static int la2016_usbxfer_allocate(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ size_t bufsize, xfercount;
+ uint8_t *buffer;
+ struct libusb_transfer *xfer;
+
+ devc = sdi ? sdi->priv : NULL;
+ if (!devc)
+ return SR_ERR_ARG;
+
+ /* Transfers were already allocated before? */
+ if (devc->transfers)
+ return SR_OK;
+
+ /*
+ * Allocate all USB transfers and their buffers. Arrange for a
+ * buffer size which is within the device's capabilities, and
+ * is a multiple of the USB endpoint's size, to make use of the
+ * RAW_IO performance feature.
+ *
+ * Implementation detail: The LA2016_USB_BUFSZ value happens
+ * to match all those constraints. No additional arithmetics is
+ * required in this location.
+ */
+ bufsize = LA2016_USB_BUFSZ;
+ xfercount = LA2016_USB_XFER_COUNT;
+ while (xfercount--) {
+ buffer = g_try_malloc(bufsize);
+ if (!buffer) {
+ sr_err("Cannot allocate USB transfer buffer.");
+ return SR_ERR_MALLOC;
+ }
+ xfer = libusb_alloc_transfer(0);
+ if (!xfer) {
+ sr_err("Cannot allocate USB transfer.");
+ g_free(buffer);
+ return SR_ERR_MALLOC;
+ }
+ xfer->buffer = buffer;
+ devc->transfers = g_slist_append(devc->transfers, xfer);
+ }
+ devc->transfer_bufsize = bufsize;
+
+ return SR_OK;
+}
+
+static int la2016_usbxfer_cancel_all(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ GSList *l;
+ struct libusb_transfer *xfer;
+
+ devc = sdi ? sdi->priv : NULL;
+ if (!devc)
+ return SR_ERR_ARG;
+
+ /* Unconditionally cancel the transfer. Ignore errors. */
+ for (l = devc->transfers; l; l = l->next) {
+ xfer = l->data;
+ if (!xfer)
+ continue;
+ libusb_cancel_transfer(xfer);
+ }
+
+ return SR_OK;
+}
+
+static int la2016_usbxfer_resubmit(const struct sr_dev_inst *sdi,
+ struct libusb_transfer *xfer)
+{
+ struct dev_context *devc;
+ struct sr_usb_dev_inst *usb;
+ libusb_transfer_cb_fn cb;
+ int ret;
+
+ devc = sdi ? sdi->priv : NULL;
+ usb = sdi ? sdi->conn : NULL;
+ if (!devc || !usb)
+ return SR_ERR_ARG;
+
+ if (!xfer)
+ return SR_ERR_ARG;
+
+ cb = receive_transfer;
+ libusb_fill_bulk_transfer(xfer, usb->devhdl,
+ USB_EP_CAPTURE_DATA | LIBUSB_ENDPOINT_IN,
+ xfer->buffer, devc->transfer_bufsize,
+ cb, (void *)sdi, CAPTURE_TIMEOUT_MS);
+ ret = libusb_submit_transfer(xfer);
+ if (ret != 0) {
+ sr_err("Cannot submit USB transfer: %s.",
+ libusb_error_name(ret));
+ return SR_ERR_IO;
+ }
+
+ return SR_OK;
+}
+
+static int la2016_usbxfer_submit_all(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ GSList *l;
+ struct libusb_transfer *xfer;
+ int ret;
+
+ devc = sdi ? sdi->priv : NULL;
+ if (!devc)
+ return SR_ERR_ARG;
+
+ for (l = devc->transfers; l; l = l->next) {
+ xfer = l->data;
+ if (!xfer)
+ return SR_ERR_ARG;
+ ret = la2016_usbxfer_resubmit(sdi, xfer);
+ if (ret != SR_OK)
+ return ret;
+ }
+
+ return SR_OK;
+}
+
SR_PRIV int la2016_setup_acquisition(const struct sr_dev_inst *sdi,
double voltage)
{
{
int ret;
+ ret = la2016_usbxfer_allocate(sdi);
+ if (ret != SR_OK)
+ return ret;
+
ret = set_run_mode(sdi, RUNMODE_RUN);
if (ret != SR_OK)
return ret;
SR_PRIV int la2016_abort_acquisition(const struct sr_dev_inst *sdi)
{
int ret;
- struct dev_context *devc;
ret = la2016_stop_acquisition(sdi);
if (ret != SR_OK)
return ret;
- devc = sdi ? sdi->priv : NULL;
- if (devc && devc->transfer)
- libusb_cancel_transfer(devc->transfer);
+ (void)la2016_usbxfer_cancel_all(sdi);
return SR_OK;
}
-static int la2016_start_download(const struct sr_dev_inst *sdi,
- libusb_transfer_cb_fn cb)
+static int la2016_start_download(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
- struct sr_usb_dev_inst *usb;
int ret;
uint8_t wrbuf[REG_SAMPLING - REG_BULK]; /* Width of REG_BULK. */
uint8_t *wrptr;
- uint32_t to_read;
- uint8_t *buffer;
devc = sdi->priv;
- usb = sdi->conn;
ret = get_capture_info(sdi);
if (ret != SR_OK)
sr_err("Cannot send USB bulk config.");
return ret;
}
- ret = ctrl_out(sdi, CMD_BULK_START, 0x00, 0, NULL, 0);
+
+ ret = la2016_usbxfer_submit_all(sdi);
if (ret != SR_OK) {
- sr_err("Cannot unblock USB bulk transfers.");
+ sr_err("Cannot submit USB bulk transfers.");
return ret;
}
- /*
- * Pick a buffer size for all USB transfers. The buffer size
- * must be a multiple of the endpoint packet size. And cannot
- * exceed a maximum value.
- */
- to_read = devc->n_bytes_to_read;
- if (to_read >= LA2016_USB_BUFSZ) /* Multiple transfers. */
- to_read = LA2016_USB_BUFSZ;
- to_read += LA2016_EP6_PKTSZ - 1;
- to_read /= LA2016_EP6_PKTSZ;
- to_read *= LA2016_EP6_PKTSZ;
- buffer = g_try_malloc(to_read);
- if (!buffer) {
- sr_dbg("USB bulk transfer size %d bytes.", (int)to_read);
- sr_err("Cannot allocate buffer for USB bulk transfer.");
- return SR_ERR_MALLOC;
- }
-
- devc->transfer = libusb_alloc_transfer(0);
- libusb_fill_bulk_transfer(devc->transfer,
- usb->devhdl, USB_EP_CAPTURE_DATA | LIBUSB_ENDPOINT_IN,
- buffer, to_read, cb, (void *)sdi, DEFAULT_TIMEOUT_MS);
-
- ret = libusb_submit_transfer(devc->transfer);
- if (ret != 0) {
- sr_err("Cannot submit USB transfer: %s.", libusb_error_name(ret));
- libusb_free_transfer(devc->transfer);
- devc->transfer = NULL;
- g_free(buffer);
- return SR_ERR_IO;
+ ret = ctrl_out(sdi, CMD_BULK_START, 0x00, 0, NULL, 0);
+ if (ret != SR_OK) {
+ sr_err("Cannot start USB bulk transfers.");
+ return ret;
}
return SR_OK;
* contain a number of samples (8bit repeat count per 16bit sample data).
*/
static void send_chunk(struct sr_dev_inst *sdi,
- const uint8_t *packets, size_t num_xfers)
+ const uint8_t *data_buffer, size_t data_length)
{
struct dev_context *devc;
- size_t num_pkts;
+ size_t num_xfers, num_pkts;
const uint8_t *rp;
uint32_t sample_value;
size_t repetitions;
devc->trigger_marked = TRUE;
}
+ /*
+ * Adjust the number of remaining bytes to read from the device
+ * before the processing of the currently received chunk affects
+ * the variable which holds the number of received bytes.
+ */
+ if (data_length > devc->n_bytes_to_read)
+ devc->n_bytes_to_read = 0;
+ else
+ devc->n_bytes_to_read -= data_length;
+
+ /* Process the received chunk of capture data. */
sample_value = 0;
- rp = packets;
+ rp = data_buffer;
+ num_xfers = data_length / TRANSFER_PACKET_LENGTH;
while (num_xfers--) {
num_pkts = devc->packets_per_chunk;
while (num_pkts--) {
(void)read_u8_inc(&rp); /* Skip sequence number. */
}
+ /*
+ * Check for several conditions which shall terminate the
+ * capture data download: When the amount of capture data in
+ * the device is exhausted. When the user specified samples
+ * count limit is reached.
+ */
+ if (!devc->n_bytes_to_read) {
+ devc->download_finished = TRUE;
+ } else {
+ sr_dbg("%" PRIu32 " more bytes to download from the device.",
+ devc->n_bytes_to_read);
+ }
if (!devc->download_finished && sr_sw_limits_check(&devc->sw_limits)) {
sr_dbg("Acquisition limit reached.");
devc->download_finished = TRUE;
{
struct sr_dev_inst *sdi;
struct dev_context *devc;
- struct sr_usb_dev_inst *usb;
- size_t num_xfers;
+ gboolean was_cancelled;
int ret;
sdi = transfer->user_data;
devc = sdi->priv;
- usb = sdi->conn;
+ was_cancelled = transfer->status == LIBUSB_TRANSFER_CANCELLED;
sr_dbg("receive_transfer(): status %s received %d bytes.",
libusb_error_name(transfer->status), transfer->actual_length);
/*
* or exhausting the device's captured data will complete the
* sample data download.
*/
- num_xfers = transfer->actual_length / TRANSFER_PACKET_LENGTH;
- send_chunk(sdi, transfer->buffer, num_xfers);
-
- devc->n_bytes_to_read -= transfer->actual_length;
- if (devc->n_bytes_to_read) {
- uint32_t to_read = devc->n_bytes_to_read;
- /*
- * Determine read size for the next USB transfer. Make
- * the buffer size a multiple of the endpoint packet
- * size. Don't exceed a maximum value.
- */
- if (to_read >= LA2016_USB_BUFSZ)
- to_read = LA2016_USB_BUFSZ;
- to_read += LA2016_EP6_PKTSZ - 1;
- to_read /= LA2016_EP6_PKTSZ;
- to_read *= LA2016_EP6_PKTSZ;
- libusb_fill_bulk_transfer(transfer,
- usb->devhdl, USB_EP_CAPTURE_DATA | LIBUSB_ENDPOINT_IN,
- transfer->buffer, to_read,
- receive_transfer, (void *)sdi, DEFAULT_TIMEOUT_MS);
-
- ret = libusb_submit_transfer(transfer);
- if (ret == 0)
+ send_chunk(sdi, transfer->buffer, transfer->actual_length);
+
+ /*
+ * Re-submit completed transfers (regardless of timeout or
+ * data reception), unless the transfer was cancelled when
+ * the acquisition was terminated or has completed.
+ */
+ if (!was_cancelled && !devc->download_finished) {
+ ret = la2016_usbxfer_resubmit(sdi, transfer);
+ if (ret == SR_OK)
return;
- sr_err("Cannot submit another USB transfer: %s.",
- libusb_error_name(ret));
+ devc->download_finished = TRUE;
}
-
- g_free(transfer->buffer);
- libusb_free_transfer(transfer);
- devc->download_finished = TRUE;
}
SR_PRIV int la2016_receive_data(int fd, int revents, void *cb_data)
/* Initiate the download of acquired sample data. */
std_session_send_df_frame_begin(sdi);
devc->frame_begin_sent = TRUE;
- ret = la2016_start_download(sdi, receive_transfer);
+ ret = la2016_start_download(sdi);
if (ret != SR_OK) {
sr_err("Cannot start acquisition data download.");
return FALSE;
}
/* Handle USB reception. Drives sample data download. */
- tv.tv_sec = tv.tv_usec = 0;
+ memset(&tv, 0, sizeof(tv));
libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
/* Postprocess completion of sample data download. */
la2016_stop_acquisition(sdi);
usb_source_remove(sdi->session, drvc->sr_ctx);
- devc->transfer = NULL;
+
+ la2016_usbxfer_cancel_all(sdi);
+ memset(&tv, 0, sizeof(tv));
+ libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
feed_queue_logic_flush(devc->feed_queue);
feed_queue_logic_free(devc->feed_queue);
return SR_OK;
}
+SR_PRIV void la2016_release_resources(const struct sr_dev_inst *sdi)
+{
+ (void)la2016_usbxfer_release(sdi);
+}
+
SR_PRIV int la2016_write_pwm_config(const struct sr_dev_inst *sdi, size_t idx)
{
return set_pwm_config(sdi, idx);
projects / libsigrok.git / blobdiff