.. _gptp-sample: gPTP Sample Application ####################### Overview ******** The gPTP sample application for Zephyr will enable gPTP support, registers gPTP phase discontinuity callback, enable traffic class support (TX multi queues) and setup VLANs (if enabled). The net-shell is also enabled so that user can monitor gPTP functionality. The source code for this sample application can be found at: :zephyr_file:`samples/net/gptp`. Requirements ************ For generic host connectivity, that can be used for debugging purposes, see :ref:`networking_with_native_posix` for details. Building and Running ******************** A good way to run this sample is to run this gPTP application inside native_posix board as described in :ref:`networking_with_native_posix` or with embedded device like NXP FRDM-K64F or Atmel SAM-E70 Xplained. Note that gPTP is only supported for boards that have an Ethernet port and which has support for collecting timestamps for sent and received Ethernet frames. Follow these steps to build the gPTP sample application: .. zephyr-app-commands:: :zephyr-app: samples/net/gptp :board: :goals: build :compact: The net-shell command "**net gptp**" will print out general gPTP information. For port 1, the command "**net gptp 1**" will print detailed information about port 1 statistics etc. Note that executing the shell command could affect the timing of the sent or received gPTP packets and the grandmaster might mark the device as non AS capable and disable it. Setting up Linux Host ===================== If you need VLAN support in your network, then the :zephyr_file:`samples/net/vlan/vlan-setup-linux.sh` provides a script that can be executed on the Linux host. It creates two VLANs on the Linux host and creates routes to Zephyr. If you are using native_posix board, then the ``net-setup.sh`` will create VLAN setup automatically with this command: .. code-block:: console ./net-setup.sh -c zeth-vlan.conf The OpenAVNU repository at https://github.com/AVnu contains gPTP daemon that can be run in Linux host and which can act as a grandmaster for the IEEE 801.1AS network. Note that OpenAVNU will not work with native_posix board as that board only supports software timestamping and OpenAVNU only supports hardware timestamping. See instructions at the end of this chapter how to run linuxptp daemon with native_posix board. Get OpenAvnu/gPTP project sources .. code-block:: console git clone git@github.com:AVnu/gptp.git After downloading the source code, compile it like this in Linux: .. code-block:: console mkdir build cd build cmake .. make cp ../gptp_cfg.ini . Edit the :file:`gptp_cfg.ini` file and set the neighborPropDelayThresh to 10000 as the default value 800 is too low if you run the gPTP in FRDM-K64F. Then execute the daemon with correct network interface and the configuration file. .. code-block:: console sudo ./gptp enp0s25 -F gptp_cfg.ini Note that here the example network interface **enp0s25** is the name of the network interface that is connected to your Zephyr device. If everything is configured correctly, you should see following kind of messages from gptp: .. code-block:: console INFO : GPTP [13:01:14:837] gPTP starting INFO : GPTP [13:01:14:838] priority1 = 248 INFO : GPTP [13:01:14:838] announceReceiptTimeout: 3 INFO : GPTP [13:01:14:838] syncReceiptTimeout: 3 INFO : GPTP [13:01:14:838] LINKSPEED_100MB - PHY delay TX: 1044 | RX: 2133 INFO : GPTP [13:01:14:838] LINKSPEED_1G - PHY delay TX: 184 | RX: 382 INFO : GPTP [13:01:14:838] neighborPropDelayThresh: 10000 INFO : GPTP [13:01:14:838] syncReceiptThreshold: 8 ERROR : GPTP [13:01:14:838] Using clock device: /dev/ptp0 STATUS : GPTP [13:01:14:838] Starting PDelay STATUS : GPTP [13:01:14:838] Link Speed: 1000000 kb/sec STATUS : GPTP [13:01:14:871] AsCapable: Enabled STATUS : GPTP [13:01:16:497] New Grandmaster "3C:97:0E:FF:FE:23:F2:32" (previous "00:00:00:00:00:00:00:00") STATUS : GPTP [13:01:16:497] Switching to Master If Zephyr syncs properly with gptp daemon, then this is printed: .. code-block:: console STATUS : GPTP [13:01:25:965] AsCapable: Enabled By default gPTP in Zephyr will not print any gPTP debug messages to console. One can enable debug prints by setting :kconfig:`CONFIG_NET_GPTP_LOG_LEVEL_DBG` in the config file. For native_posix board, use ``linuxptp`` project as that supports software timestamping. Get linuxptp project sources .. code-block:: console git clone git://git.code.sf.net/p/linuxptp/code Compile the ``ptp4l`` daemon and start it like this: .. code-block:: console sudo ./ptp4l -2 -f gPTP-zephyr.cfg -i zeth -m -q -l 6 -S Use the ``default.cfg`` as a base, copy it to ``gPTP-zephyr.cfg``, and modify it according to your needs. Multiport Setup =============== If you set :kconfig:`CONFIG_NET_GPTP_NUM_PORTS` larger than 1, then gPTP sample will create multiple TSN ports. This configuration is currently only supported in native_posix board. You need to enable the ports in the net-tools. If the number of ports is set to 2, then give following commands to create the network interfaces in host side: .. code-block:: console sudo ./net-setup.sh -c zeth0-gptp.conf -i zeth0 start sudo ./net-setup.sh -c zeth1-gptp.conf -i zeth1 start After that you can start ptp4l daemon for both interfaces. Please use two terminals when starting ptp4l daemon. Note that you must use ptp4l as OpenAVNU does not work with software clock available in native_posix. .. code-block:: console cd sudo ./ptp4l -2 -f gPTP-zephyr.cfg -m -q -l 6 -S -i zeth0 sudo ./ptp4l -2 -f gPTP-zephyr.cfg -m -q -l 6 -S -i zeth1 Compile Zephyr application. .. zephyr-app-commands:: :zephyr-app: samples/net/gptp :board: native_posix :goals: build :compact: When the Zephyr image is build, you can start it like this: .. code-block:: console build/zephyr/zephyr.exe -attach_uart