+
+ bool
+ usrp2::impl::start_rx_streaming_at(unsigned int channel, unsigned int items_per_frame, unsigned int time)
+ {
+ if (channel > MAX_CHAN) {
+ std::cerr << "usrp2: invalid channel number (" << channel
+ << ")" << std::endl;
+ return false;
+ }
+
+ if (channel > 0) { // until firmware supports multiple streams
+ std::cerr << "usrp2: channel " << channel
+ << " not implemented" << std::endl;
+ return false;
+ }
+
+ {
+ gruel::scoped_lock guard(d_channel_rings_mutex);
+ if (d_channel_rings[channel]) {
+ std::cerr << "usrp2: channel " << channel
+ << " already streaming" << std::endl;
+ return false;
+ }
+
+ if (items_per_frame == 0)
+ items_per_frame = U2_MAX_SAMPLES; // minimize overhead
+
+ op_start_rx_streaming_cmd cmd;
+ op_generic_t reply;
+
+ memset(&cmd, 0, sizeof(cmd));
+ init_etf_hdrs(&cmd.h, d_addr, 0, CONTROL_CHAN, time);
+ cmd.op.opcode = OP_START_RX_STREAMING;
+ cmd.op.len = sizeof(cmd.op);
+ cmd.op.rid = d_next_rid++;
+ cmd.op.items_per_frame = htonl(items_per_frame);
+ cmd.eop.opcode = OP_EOP;
+ cmd.eop.len = sizeof(cmd.eop);
+
+ d_dont_enqueue = false;
+ bool success = false;
+ pending_reply p(cmd.op.rid, &reply, sizeof(reply));
+ success = transmit_cmd_and_wait(&cmd, sizeof(cmd), &p, DEF_CMD_TIMEOUT);
+ success = success && (ntohx(reply.ok) == 1);
+
+ if (success)
+ d_channel_rings[channel] = ring_sptr(new ring(d_eth_buf->max_frames()));
+ else
+ d_dont_enqueue = true;
+
+ return success;
+ }
+ }
+
+ bool
+ usrp2::impl::sync_and_start_rx_streaming_at(unsigned int channel, unsigned int items_per_frame, unsigned int time)
+ {
+
+ if (channel > MAX_CHAN) {
+ std::cerr << "usrp2: invalid channel number (" << channel
+ << ")" << std::endl;
+ return false;
+ }
+
+ if (channel > 0) { // until firmware supports multiple streams
+ std::cerr << "usrp2: channel " << channel
+ << " not implemented" << std::endl;
+ return false;
+ }
+
+ {
+ gruel::scoped_lock guard(d_channel_rings_mutex);
+ if (d_channel_rings[channel]) {
+ std::cerr << "usrp2: channel " << channel
+ << " already streaming" << std::endl;
+ return false;
+ }
+
+ if (items_per_frame == 0)
+ items_per_frame = U2_MAX_SAMPLES; // minimize overhead
+
+ op_sync_and_start_rx_streaming_cmd cmd;
+ op_generic_t reply;
+
+ memset(&cmd, 0, sizeof(cmd));
+ init_etf_hdrs(&cmd.h, d_addr, 0, CONTROL_CHAN, time);
+ cmd.sync_op.opcode = OP_SYNC_TO_PPS;
+ cmd.sync_op.len = sizeof(cmd.sync_op);
+ cmd.sync_op.rid = d_next_rid++;
+ cmd.rx_op.opcode = OP_START_RX_STREAMING;
+ cmd.rx_op.len = sizeof(cmd.rx_op);
+ cmd.rx_op.rid = d_next_rid++;
+ cmd.rx_op.items_per_frame = htonl(items_per_frame);
+ cmd.eop.opcode = OP_EOP;
+ cmd.eop.len = sizeof(cmd.eop);
+
+ d_dont_enqueue = false;
+ bool success = false;
+ pending_reply p(cmd.sync_op.rid, &reply, sizeof(reply));
+ success = transmit_cmd_and_wait(&cmd, sizeof(cmd), &p, DEF_CMD_TIMEOUT);
+ success = success && (ntohx(reply.ok) == 1);
+
+ if (success)
+ d_channel_rings[channel] = ring_sptr(new ring(d_eth_buf->max_frames()));
+ else
+ d_dont_enqueue = true;
+
+ return success;
+ }
+ }
+