+
+ /*
+ * 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;
+ }
+ if (devc->download_finished) {
+ sr_dbg("Download finished, flushing session feed queue.");
+ feed_queue_logic_flush(devc->feed_queue);
+ }
+ sr_dbg("Total samples after chunk: %" PRIu64 ".", devc->total_samples);
+}
+
+/*
+ * Process a chunk of capture data in streaming mode. The memory layout
+ * is rather different from "normal mode" (see the send_chunk() routine
+ * above). In streaming mode data is not compressed, and memory cells
+ * neither contain raw sampled pin values at a given point in time. The
+ * memory content needs transformation.
+ * - The memory content can be seen as a sequence of memory cells.
+ * - Each cell contains samples that correspond to the same channel.
+ * The next cell contains samples for the next channel, etc.
+ * - Only enabled channels occupy memory cells. Disabled channels are
+ * not part of the capture data memory layout.
+ * - The LSB bit position in a cell is the sample which was taken first
+ * for this channel. Upper bit positions were taken later.
+ *
+ * Implementor's note: This routine is inspired by convert_sample_data()
+ * in the https://github.com/AlexUg/sigrok implementation. Which in turn
+ * appears to have been derived from the saleae-logic16 sigrok driver.
+ * The code is phrased conservatively to verify the layout as discussed
+ * above, performance was not a priority. Operation was verified with an
+ * LA2016 device. The memory layout of 32 channel models is yet to get
+ * determined.
+ */
+static void stream_data(struct sr_dev_inst *sdi,
+ const uint8_t *data_buffer, size_t data_length)
+{
+ struct dev_context *devc;
+ struct stream_state_t *stream;
+ size_t bit_count;
+ const uint8_t *rp;
+ uint32_t sample_value;
+ uint8_t sample_buff[sizeof(sample_value)];
+ size_t bit_idx;
+ uint32_t ch_mask;
+
+ devc = sdi->priv;
+ stream = &devc->stream;
+
+ /* Ignore incoming USB data after complete sample data download. */
+ if (devc->download_finished)
+ return;
+ sr_dbg("Stream mode, got another chunk: %p, length %zu.",
+ data_buffer, data_length);
+
+ /* TODO Add soft trigger support when in stream mode? */
+
+ /*
+ * TODO Are memory cells always as wide as the channel count?
+ * Are they always 16bits wide? Verify for 32 channel devices.
+ */
+ bit_count = devc->model->channel_count;
+ if (bit_count == 32) {
+ data_length /= sizeof(uint32_t);
+ } else if (bit_count == 16) {
+ data_length /= sizeof(uint16_t);
+ } else {
+ /*
+ * Unhandled case. Acquisition should not start.
+ * The statement silences the compiler.
+ */
+ return;
+ }
+ rp = data_buffer;
+ sample_value = 0;
+ while (data_length--) {
+ /* Get another entity. */
+ if (bit_count == 32)
+ sample_value = read_u32le_inc(&rp);
+ else if (bit_count == 16)
+ sample_value = read_u16le_inc(&rp);
+
+ /* Map the entity's bits to a channel's samples. */
+ ch_mask = stream->channel_masks[stream->channel_index];
+ for (bit_idx = 0; bit_idx < bit_count; bit_idx++) {
+ if (sample_value & (1UL << bit_idx))
+ stream->sample_data[bit_idx] |= ch_mask;
+ }
+
+ /*
+ * Advance to the next channel. Submit a block of
+ * samples when all channels' data was seen.
+ */
+ stream->channel_index++;
+ if (stream->channel_index != stream->enabled_count)
+ continue;
+ for (bit_idx = 0; bit_idx < bit_count; bit_idx++) {
+ sample_value = stream->sample_data[bit_idx];
+ write_u32le(sample_buff, sample_value);
+ feed_queue_logic_submit(devc->feed_queue, sample_buff, 1);