+static void abort_acquisition(struct dev_context *devc)
+{
+ int i;
+
+ devc->acq_aborted = TRUE;
+
+ for (i = devc->num_transfers - 1; i >= 0; i--) {
+ if (devc->transfers[i])
+ libusb_cancel_transfer(devc->transfers[i]);
+ }
+
+ devc->status = H4032L_STATUS_IDLE;
+}
+
+static void finish_acquisition(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc = sdi->priv;
+ struct drv_context *drvc = sdi->driver->context;
+
+ std_session_send_df_end(sdi);
+ usb_source_remove(sdi->session, drvc->sr_ctx);
+
+ devc->num_transfers = 0;
+ g_free(devc->transfers);
+}
+
+static void free_transfer(struct libusb_transfer *transfer)
+{
+ struct sr_dev_inst *sdi = transfer->user_data;
+ struct dev_context *devc = sdi->priv;
+ unsigned int i;
+
+ if ((transfer->buffer != (unsigned char *)&devc->cmd_pkt) &&
+ (transfer->buffer != devc->buf)) {
+ g_free(transfer->buffer);
+ }
+
+ transfer->buffer = NULL;
+ libusb_free_transfer(transfer);
+
+ for (i = 0; i < devc->num_transfers; i++) {
+ if (devc->transfers[i] == transfer) {
+ devc->transfers[i] = NULL;
+ break;
+ }
+ }
+
+ if (--devc->submitted_transfers == 0)
+ finish_acquisition(sdi);
+}
+
+static void resubmit_transfer(struct libusb_transfer *transfer)
+{
+ int ret;
+
+ if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
+ return;
+
+ sr_err("%s: %s", __func__, libusb_error_name(ret));
+ free_transfer(transfer);
+}
+
+static void send_data(struct sr_dev_inst *sdi,
+ uint32_t *data, size_t sample_count)
+{
+ struct dev_context *devc = sdi->priv;
+ struct sr_datafeed_logic logic = {
+ .length = sample_count * sizeof(uint32_t),
+ .unitsize = sizeof(uint32_t),
+ .data = data
+ };
+ const struct sr_datafeed_packet packet = {
+ .type = SR_DF_LOGIC,
+ .payload = &logic
+ };
+ const struct sr_datafeed_packet trig = {
+ .type = SR_DF_TRIGGER,
+ .payload = NULL
+ };
+ size_t trigger_offset;
+
+ if (devc->trigger_pos >= devc->sent_samples &&
+ devc->trigger_pos < (devc->sent_samples + sample_count)) {
+ /* Get trigger position. */
+ trigger_offset = devc->trigger_pos - devc->sent_samples;
+ logic.length = trigger_offset * sizeof(uint32_t);
+ if (logic.length)
+ sr_session_send(sdi, &packet);
+
+ /* Send trigger position. */
+ sr_session_send(sdi, &trig);
+
+ /* Send rest of data. */
+ logic.length = (sample_count - trigger_offset) * sizeof(uint32_t);
+ logic.data = data + trigger_offset;
+ if (logic.length)
+ sr_session_send(sdi, &packet);
+ } else {
+ sr_session_send(sdi, &packet);
+ }
+
+ devc->sent_samples += sample_count;
+}
+