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View Code? Open in Web Editor NEW100 Msps support for Ettus USRP N210
100 Msps support for Ettus USRP N210
100 Msps Receive Support for USRP N210 ====================================== To receive at 100 Msps, you'll need to load a modified FPGA image onto the N210 and use UHD 003.004.000-ish library that works with FPGA compatibility version 9.0. The changes are based on uhd/fpga/usrp2 pulled on 6-Apr-2012. No changes to uhd/host are required. There are pre-built images and ISE projects for N210 revisions 3 and 4. The rev 3 image will also work on rev 2 boards. The FPGA has no transmit logic, so it can only receive. We've tested it with a DBSRX2, but other daughterboards should work. In the modified FPGA, DSP 0 is unchanged and can be used for normal decimation to 25 Msps or below. DSP 1 only supports 100 Msps. To receive at 100 Msps, setup two channels: usrp->set_rx_subdev_spec(uhd::usrp::subdev_spec_t("A:0 A:0")); And specify channel 1 for set_rx_freq, get_rx_gain, etc. When creating the rx_streamer, specify channel 1: stream_args.channels.push_back(1); uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args); When receiving at 100 Msps, a maximum of 2^18 (262,144) contiguous samples (the size of the N210's SRAM) can be requested at a time. Only STREAM_MODE_NUM_SAMPS_AND_DONE is supported. To receive at normal decimated rates, just use channel 0 or don't specify a channel. The uhd_streamer.cpp command line app has details. We've built and used it on Ubuntu 10.04 and Windows 7 Pro. It also has a client/server facility to make a set of USRPs sharable with several apps. Load the FPGA ------------- cd path/to/N210CeVI # Substitute the IP address of your N210 /usr/local/share/uhd/utils/usrp_n2xx_net_burner.py --addr=192.168.10.2 --fpga=n210_r3.bin or /usr/local/share/uhd/utils/usrp_n2xx_net_burner.py --addr=192.168.10.2 --fpga=n210_r4.bin # If that went okay, power cycle the N210 or: /usr/local/share/uhd/utils/usrp_n2xx_net_burner.py --addr=192.168.10.2 --reset Use similar commands on Windows. Build uhd_streamer on Linux --------------------------- cd path/to/N210CeVI gcc uhd_streamer.cpp -o uhd_streamer -luhd ./uhd_streamer --help Build uhd_streamer on Windows ----------------------------- (I really need to create the cmake goo for this.) I manually created a Visual Studio 10 project for a console app. I deleted the generated .cpp file and added uhd_streamer.cpp. Then I added include directories for UHD and boost, library directories for UHD and boost, and the UHD lib as a link input.
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