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README
.. zephyr:code-sample:: tracing
   :name: Tracing

   Send tracing formatted packet to the host with supported backends.

This application can be used to demonstrate the tracing feature. The tracing formatted packet will be sent to the host with the currently supported tracing backend under tracing generic infrastructure.

Requirements

Depends of the boards which you are using, choose one of .conf files for use tracing subsys.

Usage for UART Tracing Backend

Build a UART-tracing image with:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: mps2/an521
        :conf: "prj_uart.conf"
        :goals: build
        :compact:

or:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: mps2/an521
        :conf: "prj_uart_ctf.conf"
        :goals: build
        :compact:

Note

You may need to set "zephyr,tracing-uart" property under the chosen node in your devicetree. See :zephyr_file:`samples/subsys/tracing/boards/mps2_an521_cpu0.overlay` for an example.

After the application has run for a while, check the trace output file.

Usage for USB Tracing Backend

Build a USB-tracing image with:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: sam_e70_xplained/same70q21
        :conf: "prj_usb.conf"
        :goals: build
        :compact:

or:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: sam_e70_xplained/same70q21
        :conf: "prj_usb_ctf.conf"
        :goals: build
        :compact:

After the serial console has stable output like this:

threadA: Hello World!
threadB: Hello World!
threadA: Hello World!
threadB: Hello World!

Connect the board's USB port to the host device and run the :zephyr_file:`scripts/tracing/trace_capture_usb.py` script on the host:

sudo python3 trace_capture_usb.py -v 0x2FE9 -p 0x100 -o channel0_0

The VID and PID of USB device can be configured, just adjusting it accordingly.

Usage for POSIX Tracing Backend

Build a POSIX-tracing image with:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: native_sim
        :goals: build
        :compact:

or:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: native_sim
        :conf: "prj_native_ctf.conf"
        :goals: build
        :compact:

After the application has run for a while, check the trace output file.

Usage for USER Tracing Backend

Build a USER-tracing image with:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: qemu_x86
        :conf: "prj_user.conf"
        :goals: build
        :compact:

After the application has run for a while, check the trace output file.

Usage for SEGGER SystemView RTT

Build a SystemView-tracing image with the :ref:`snippet-rtt-tracing`:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: frdm_k64f
        :snippets: rtt-tracing
        :goals: build
        :compact:

After the application has run for a while, check the trace output file.

Usage for GPIO Tracing Backend

Build a GPIO-tracing image with:

.. zephyr-app-commands::
        :zephyr-app: samples/subsys/tracing
        :board: native_sim
        :conf: "prj_gpio.conf"
        :goals: build
        :compact:

After the application has run for a while, check the trace output file.

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