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diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst new file mode 100644 index 000000000..8e9aa6d50 --- /dev/null +++ b/host/docs/usrp2.rst @@ -0,0 +1,463 @@ +======================================================================== +UHD - USRP2 and N2X0 Series Application Notes +======================================================================== + +.. contents:: Table of Contents + +------------------------------------------------------------------------ +Comparative features list +------------------------------------------------------------------------ + +* 1 transceiver card slot +* 2 RX DDC chains in FPGA +* 1 TX DUC chain in FPGA +* Timed commands in FPGA (N2x0 only) +* Timed sampling in FPGA +* External PPS reference +* External 10MHz reference +* MIMO cable shared reference +* Fixed 100 MHz clock rate +* Internal GPSDO option (N2x0 only) +* sc8 and sc16 sample modes + +------------------------------------------------------------------------ +Load the Images onto the SD card (USRP2 only) +------------------------------------------------------------------------ +**Warning!** +Use **usrp2_card_burner.py** with caution. If you specify the wrong device node, +you could overwrite your hard drive. Make sure that **--dev=** specifies the SD card. + +**Warning!** +It is possible to use 3rd party SD cards with the USRP2. +However, certain types of SD cards will not interface with the CPLD: + +* Cards can be SDHC, which is not a supported interface. +* Cards can have unexpected timing characteristics. + +For these reasons, we recommend that you use the SD card that was supplied with the USRP2. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Use the card burner tool (UNIX) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +:: + + sudo <install-path>/share/uhd/utils/usrp2_card_burner_gui.py + + -- OR -- + + cd <install-path>/share/uhd/utils + sudo ./usrp2_card_burner.py --dev=/dev/sd<XXX> --fpga=<path_to_fpga_image> + sudo ./usrp2_card_burner.py --dev=/dev/sd<XXX> --fw=<path_to_firmware_image> + +Use the **--list** option to get a list of possible raw devices. +The list result will filter out disk partitions and devices too large to be the sd card. +The list option has been implemented on Linux, Mac OS X, and Windows. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Use the card burner tool (Windows) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +:: + + <path_to_python.exe> <install-path>/share/uhd/utils/usrp2_card_burner_gui.py + +------------------------------------------------------------------------ +Load the Images onto the On-board Flash (USRP-N Series only) +------------------------------------------------------------------------ +The USRP-N Series can be reprogrammed over the network +to update or change the firmware and FPGA images. +When updating images, always burn both the FPGA and firmware images before power cycling. +This ensures that when the device reboots, it has a compatible set of images to boot into. + +**Note:** +Different hardware revisions require different FPGA images. +Determine the revision number from the sticker on the rear of the chassis. +Use this number to select the correct FPGA image for your device. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Use the net burner tool (UNIX) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +:: + + <install-path>/share/uhd/utils/usrp_n2xx_net_burner_gui.py + + -- OR -- + + cd <install-path>/share/uhd/utils + ./usrp_n2xx_net_burner.py --addr=<ip address> --fw=<path for firmware image> + ./usrp_n2xx_net_burner.py --addr=<ip address> --fpga=<path to FPGA image> + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Use the net burner tool (Windows) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +:: + + <path_to_python.exe> <install-path>/share/uhd/utils/usrp_n2xx_net_burner_gui.py + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Device recovery and bricking +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Its possible to put the device into an unusable state by loading bad images. +Fortunately, the USRP-N Series can be booted into a safe (read-only) image. +Once booted into the safe image, the user can once again load images onto the device. + +The safe-mode button is a pushbutton switch (S2) located inside the enclosure. +To boot into the safe image, hold-down the safe-mode button while power-cycling the device. +Continue to hold-down the button until the front-panel LEDs blink and remain solid. + +When in safe-mode, the USRP-N device will always have the IP address **192.168.10.2**. + +------------------------------------------------------------------------ +Setup Networking +------------------------------------------------------------------------ +The USRP2 only supports Gigabit Ethernet +and will not work with a 10/100 Mbps interface. +However, a 10/100 Mbps interface can be connected indirectly +to a USRP2 through a Gigabit Ethernet switch. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Setup the host interface +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +The USRP2 communicates at the IP/UDP layer over the gigabit ethernet. +The default IP address of the USRP2 is **192.168.10.2**. +You will need to configure the host's Ethernet interface with a static IP +address to enable communication. An address of **192.168.10.1** and a subnet +mask of **255.255.255.0** is recommended. + +On a Linux system, you can set a static IP address very easily by using the +'ifconfig' command: +:: + + sudo ifconfig <interface> 192.168.10.1 + +Note that **<interface>** is usually something like **eth0**. You can discover the +names of the network interfaces in your computer by running **ifconfig** without +any parameters: +:: + + ifconfig -a + +**Note:** +When using UHD, if an IP address for the USRP2 is not specified, +the software will use UDP broadcast packets to locate the USRP2. +On some systems, the firewall will block UDP broadcast packets. +It is recommended that you change or disable your firewall settings. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Multiple devices per host +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +For maximum throughput, one Ethernet interface per USRP2 is recommended, +although multiple devices may be connected via a Gigabit Ethernet switch. +In any case, each Ethernet interface should have its own subnet, +and the corresponding USRP2 device should be assigned an address in that subnet. +Example: + +**Configuration for USRP2 device 0:** + +* Ethernet interface IPv4 address: **192.168.10.1** +* Ethernet interface subnet mask: **255.255.255.0** +* USRP2 device IPv4 address: **192.168.10.2** + +**Configuration for USRP2 device 1:** + +* Ethernet interface IPv4 address: **192.168.20.1** +* Ethernet interface subnet mask: **255.255.255.0** +* USRP2 device IPv4 address: **192.168.20.2** + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Change the USRP2's IP address +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +You may need to change the USRP2's IP address for several reasons: + +* to satisfy your particular network configuration +* to use multiple USRP2s on the same host computer +* to set a known IP address into USRP2 (in case you forgot) + +**Method 1:** +To change the USRP2's IP address, +you must know the current address of the USRP2, +and the network must be setup properly as described above. +Run the following commands: +:: + + cd <install-path>/share/uhd/utils + ./usrp_burn_mb_eeprom --args=<optional device args> --key=ip-addr --val=192.168.10.3 + +**Method 2 (Linux Only):** +This method assumes that you do not know the IP address of your USRP2. +It uses raw Ethernet packets to bypass the IP/UDP layer to communicate with the USRP2. +Run the following commands: +:: + + cd <install-path>/share/uhd/utils + sudo ./usrp2_recovery.py --ifc=eth0 --new-ip=192.168.10.3 + +------------------------------------------------------------------------ +Communication Problems +------------------------------------------------------------------------ +When setting up a development machine for the first time, +you may have various difficulties communicating with the USRP device. +The following tips are designed to help narrow down and diagnose the problem. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +RuntimeError: no control response +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +This is a common error that occurs when you have set the subnet of your network +interface to a different subnet than the network interface of the USRP. For +example, if your network interface is set to **192.168.20.1**, and the USRP is +**192.168.10.2** (note the difference in the third numbers of the IP addresses), you +will likely see a 'no control response' error message. + +Fixing this is simple - just set the your host PC's IP address to the same +subnet as that of your USRP. Instructions for setting your IP address are in the +previous section of this documentation. + + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Firewall issues +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +When the IP address is not specified, +the device discovery broadcasts UDP packets from each ethernet interface. +Many firewalls will block the replies to these broadcast packets. +If disabling your system's firewall +or specifying the IP address yields a discovered device, +then your firewall may be blocking replies to UDP broadcast packets. +If this is the case, we recommend that you disable the firewall +or create a rule to allow all incoming packets with UDP source port **49152**. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Ping the device +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +The USRP will reply to ICMP echo requests. +A successful ping response means that the device has booted properly +and that it is using the expected IP address. + +:: + + ping 192.168.10.2 + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Monitor the serial output +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Read the serial port to get debug verbose output from the embedded microcontroller. +The microcontroller prints useful information about IP addresses, +MAC addresses, control packets, fast-path settings, and bootloading. +Use a standard USB to 3.3v-level serial converter at 230400 baud. +Connect **GND** to the converter ground, and connect **TXD** to the converter receive. +The **RXD** pin can be left unconnected as this is only a one-way communication. + +* **USRP2:** Serial port located on the rear edge +* **N210:** Serial port located on the left side + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Monitor the host network traffic +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Use Wireshark to monitor packets sent to and received from the device. + +------------------------------------------------------------------------ +Addressing the Device +------------------------------------------------------------------------ + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Single device configuration +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +In a single-device configuration, +the USRP device must have a unique IPv4 address on the host computer. +The USRP can be identified through its IPv4 address, resolvable hostname, or by other means. +See the application notes on `device identification <./identification.html>`_. +Use this addressing scheme with the **single_usrp** interface. + +Example device address string representation for a USRP2 with IPv4 address **192.168.10.2**: + +:: + + addr=192.168.10.2 + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Multiple device configuration +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +In a multi-device configuration, +each USRP device must have a unique IPv4 address on the host computer. +The device address parameter keys must be suffixed with the device index. +Each parameter key should be of the format <key><index>. +Use this addressing scheme with the **multi_usrp** interface. + +* The order in which devices are indexed corresponds to the indexing of the transmit and receive channels. +* The key indexing provides the same granularity of device identification as in the single device case. + +Example device address string representation for 2 USRP2s with IPv4 addresses **192.168.10.2** and **192.168.20.2**: +:: + + addr0=192.168.10.2, addr1=192.168.20.2 + +------------------------------------------------------------------------ +Using the MIMO Cable +------------------------------------------------------------------------ +The MIMO cable allows two USRP devices to share reference clocks, +time synchronization, and the Ethernet interface. +One of the devices will sync its clock and time references to the MIMO cable. +This device will be referred to as the slave, and the other device, the master. + +* The slave device acquires the clock and time references from the master device. +* The master and slave may be used individually or in a multi-device configuration. +* External clocking is optional and should only be supplied to the master device. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Shared ethernet mode +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +In shared Ethernet mode, +only one device in the configuration can be attached to the Tthernet. + +* Clock reference, time reference, and data are communicated over the MIMO cable. +* Master and slave must have different IPv4 addresses in the same subnet. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Dual ethernet mode +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +In dual Ethernet mode, +both devices in the configuration must be attached to the Ethernet. + +* Only clock reference and time reference are communicated over the MIMO cable. +* The master and slave must have different IPv4 addresses in different subnets. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Configuring the slave +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +In order for the slave to synchronize to the master over MIMO cable, +the following clock configuration must be set on the slave device: +:: + + uhd::clock_config_t clock_config; + clock_config.ref_source = uhd::clock_config_t::REF_MIMO; + clock_config.pps_source = uhd::clock_config_t::PPS_MIMO; + usrp->set_clock_config(clock_config, slave_index); + + +------------------------------------------------------------------------ +Alternative stream destination +------------------------------------------------------------------------ +It is possible to program the USRP to send RX packets to an alternative IP/UDP destination. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Set the subnet and gateway +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +To use an alternative streaming destination, +the device needs to be able to determine if the destination address +is within its subnet, and ARP appropriately. +Therefore, the user should ensure that subnet and gateway addresses +have been programmed into the device's EEPROM. + +Run the following commands: +:: + + cd <install-path>/share/uhd/utils + ./usrp_burn_mb_eeprom --args=<optional device args> --key=subnet --val=255.255.255.0 + ./usrp_burn_mb_eeprom --args=<optional device args> --key=gateway --val=192.168.10.1 + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Create a receive streamer +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Set the stream args "addr" and "port" values to the alternative destination. +Packets will be sent to this destination when the user issues a stream command. + +:: + + //create a receive streamer, host type does not matter + uhd::stream_args_t stream_args("fc32"); + + //resolvable address and port for a remote udp socket + stream_args.args["addr"] = "192.168.10.42"; + stream_args.args["port"] = "12345"; + + //create the streamer + uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args); + + //issue stream command + uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE); + stream_cmd.num_samps = total_num_samps; + stream_cmd.stream_now = true; + usrp->issue_stream_cmd(stream_cmd); + +**Note:** +Calling recv() on this streamer object should yield a timeout. + +------------------------------------------------------------------------ +Hardware Setup Notes +------------------------------------------------------------------------ + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Front panel LEDs +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +The LEDs on the front panel can be useful in debugging hardware and software issues. +The LEDs reveal the following about the state of the device: + +* **LED A:** transmitting +* **LED B:** mimo cable link +* **LED C:** receiving +* **LED D:** firmware loaded +* **LED E:** reference lock +* **LED F:** CPLD loaded + + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Ref Clock - 10MHz +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Using an external 10MHz reference clock, a square wave will offer the best phase +noise performance, but a sinusoid is acceptable. The reference clock requires the following power level: + +* **USRP2** 5 to 15dBm +* **N2XX** 0 to 15dBm + + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +PPS - Pulse Per Second +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Using a PPS signal for timestamp synchronization requires a square wave signal with the following amplitude: + +* **USRP2** 5Vpp +* **N2XX** 3.3 to 5Vpp + +Test the PPS input with the following app: + +* **<args>** are device address arguments (optional if only one USRP is on your machine) + +:: + + cd <install-path>/share/uhd/examples + ./test_pps_input --args=<args> + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Internal GPSDO +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Please see the `Internal GPSDO Application Notes <./gpsdo.html>`_ +for information on configuring and using the internal GPSDO. + +------------------------------------------------------------------------ +Miscellaneous +------------------------------------------------------------------------ + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Available Sensors +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +The following sensors are available for the USRP2/N-Series motherboards; +they can be queried through the API. + +* **mimo_locked** - clock reference locked over the MIMO cable +* **ref_locked** - clock reference locked (internal/external) +* other sensors are added when the GPSDO is enabled + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Multiple RX channels +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +There are two complete DDC chains in the FPGA. +In the single channel case, only one chain is ever used. +To receive from both channels, +the user must set the **RX** subdevice specification. +This hardware has only one daughterboard slot, +which has been aptly named slot **A**. + +In the following example, a TVRX2 is installed. +Channel 0 is sourced from subdevice **RX1**, +and channel 1 is sourced from subdevice **RX2**: +:: + + usrp->set_rx_subdev_spec("A:RX1 A:RX2"); |