doc/guides/debugging/probes.rst - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 .. _debug-probes:

 Debug Probes
 ############

 A *debug probe* is special hardware which allows you to control execution of a
 Zephyr application running on a separate board. Debug probes usually allow
 reading and writing registers and memory, and support breakpoint debugging of
 the Zephyr application on your host workstation using tools like GDB. They may
 also support other debug software and more advanced features such as
 :ref:`tracing program execution <tracing>`. For details on the related host
 software supported by Zephyr, see :ref:`debug-host-tools`.

 Debug probes are usually connected to your host workstation via USB; they
 are sometimes also accessible via an IP network or other means. They usually
 connect to the device running Zephyr using the JTAG or SWD protocols. Debug
 probes are either separate hardware devices or circuitry integrated into the same
 board which runs Zephyr.

 Many supported boards in Zephyr include a second microcontroller that serves as
 an onboard debug probe, usb-to-serial adapter, and sometimes a drag-and-drop
 flash programmer. This eliminates the need to purchase an external debug probe
 and provides a variety of debug host tool options.

 Several hardware vendors have their own branded onboard debug probe
 implementations: NXP LPC boards have LPC-Link2, NXP Kinetis (former Freescale)
 boards have OpenSDA, and ST boards have ST-LINK. Each onboard debug probe
 microcontroller can support one or more types of firmware that communicate with
 their respective debug host tools. For example, an OpenSDA microcontroller can
 be programmed with DAPLink firmware to communicate with pyOCD or OpenOCD debug
 host tools, or with J-Link firmware to communicate with J-Link debug host
 tools.

 Some supported boards in Zephyr do not include an onboard debug probe and
 therefore require an external debug probe. In addition, boards that do include
 an onboard debug probe often also have an SWD or JTAG header to enable the use
 of an external debug probe instead. One reason this may be useful is that the
 onboard debug probe may have limitations, such as lack of support for advanced
 debuggers or high-speed tracing. You may need to adjust jumpers to prevent the
 onboard debug probe from interfering with the external debug probe.

 .. _lpclink2-jlink-onboard-debug-probe:

 LPC-Link2 J-Link Onboard Debug Probe
 ************************************

 The LPC-Link2 J-Link is an onboard debug probe and usb-to-serial adapter
 supported on many NXP LPC and i.MX RT development boards.

 This debug probe is compatible with the following debug host tools:

 - :ref:`jlink-debug-host-tools`

 This probe is realized by programming the LPC-Link2 microcontroller with J-Link
 LPC-Link2 firmware. Download and install `LPCScrypt`_ to get the firmware and
 programming scripts.

 .. note:: Verify the firmware supports your board by visiting `Firmware for LPCXpresso`_

 1. Put the LPC-Link2 microcontroller into DFU boot mode by attaching the DFU
    jumper, then powering up the board.

 #. Run the ``program_JLINK`` script.

 #. Remove the DFU jumper and power cycle the board.

 .. _opensda-daplink-onboard-debug-probe:

 OpenSDA DAPLink Onboard Debug Probe
 ***********************************

 The OpenSDA DAPLink is an onboard debug probe and usb-to-serial adapter
 supported on many NXP Kinetis and i.MX RT development boards. It also includes
 drag-and-drop flash programming support.

 This debug probe is compatible with the following debug host tools:

 - :ref:`pyocd-debug-host-tools`
 - :ref:`openocd-debug-host-tools`

 This probe is realized by programming the OpenSDA microcontroller with DAPLink
 OpenSDA firmware. NXP provides `OpenSDA DAPLink Board-Specific Firmwares`_.

 Install the debug host tools before you program the firmware.

 As with all OpenSDA debug probes, the steps for programming the firmware are:

 1. Put the OpenSDA microcontroller into bootloader mode by holding the reset
    button while you power on the board. Note that "bootloader mode" in this
    context applies to the OpenSDA microcontroller itself, not the target
    microcontroller of your Zephyr application.

 #. After you power on the board, release the reset button. A USB mass storage
    device called **BOOTLOADER** or **MAINTENANCE** will enumerate.

 #. Copy the OpenSDA firmware binary to the USB mass storage device.

 #. Power cycle the board, this time without holding the reset button. You
    should see three USB devices enumerate: a CDC device (serial port), a HID
    device (debug port), and a mass storage device (drag-and-drop flash
    programming).

 .. _opensda-jlink-onboard-debug-probe:

 OpenSDA J-Link Onboard Debug Probe
 **********************************

 The OpenSDA J-Link is an onboard debug probe and usb-to-serial adapter
 supported on many NXP Kinetis and i.MX RT development boards.

 This debug probe is compatible with the following debug host tools:

 - :ref:`jlink-debug-host-tools`

 This probe is realized by programming the OpenSDA microcontroller with J-Link
 OpenSDA firmware. Segger provides `OpenSDA J-Link Generic Firmwares`_ and
 `OpenSDA J-Link Board-Specific Firmwares`_, where the latter is generally
 recommended when available. Board-specific firmwares are required for i.MX RT
 boards to support their external flash memories, whereas generic firmwares are
 compatible with all Kinetis boards.

 Install the debug host tools before you program the firmware.

 As with all OpenSDA debug probes, the steps for programming the firmware are:

 1. Put the OpenSDA microcontroller into bootloader mode by holding the reset
    button while you power on the board. Note that "bootloader mode" in this
    context applies to the OpenSDA microcontroller itself, not the target
    microcontroller of your Zephyr application.

 #. After you power on the board, release the reset button. A USB mass storage
    device called **BOOTLOADER** or **MAINTENANCE** will enumerate.

 #. Copy the OpenSDA firmware binary to the USB mass storage device.

 #. Power cycle the board, this time without holding the reset button. You
    should see two USB devices enumerate: a CDC device (serial port) and a
    vendor-specific device (debug port).

 .. _stlink-v21-onboard-debug-probe:

 ST-LINK/V2-1 Onboard Debug Probe
 ********************************

 ST-LINK/V2-1 is a serial and debug adapter built into all Nucleo and Discovery
 boards. It provides a bridge between your computer (or other USB host) and the
 embedded target processor, which can be used for debugging, flash programming,
 and serial communication, all over a simple USB cable.

 It is compatible with the following host debug tools:

 - :ref:`openocd-debug-host-tools`
 - :ref:`jlink-debug-host-tools`

 For some STM32 based boards, it is also compatible with:

 - :ref:`pyocd-debug-host-tools`

 While it works out of the box with OpenOCD, it requires some flashing
 to work with J-Link. To do this, SEGGER offers a firmware upgrading the
 ST-LINK/V2-1 on board on the Nucleo and Discovery boards. This firmware makes
 the ST-LINK/V2-1 compatible with J-LinkOB, allowing users to take advantage of
 most J-Link features like the ultra fast flash download and debugging speed or
 the free-to-use GDBServer.

 More informations about upgrading ST-LINK/V2-1 to JLink or restore ST-Link/V2-1
 firmware please visit: `Segger over ST-Link`_

 Flash and debug with ST-Link
 ============================

 Using OpenOCD
 -------------

 OpenOCD is available by default on ST-Link and configured as the default flash
 and debug tool. Flash and debug can be done as follows:

   .. zephyr-app-commands::
      :zephyr-app: samples/hello_world
      :goals: flash

   .. zephyr-app-commands::
      :zephyr-app: samples/hello_world
      :goals: debug


 Using Segger J-Link
 -------------------

 Once STLink is flashed with SEGGER FW and J-Link GDB server is installed on your
 host computer, you can flash and debug as follows:

 Use CMake with ``-DZEPHYR_BOARD_FLASH_RUNNER=jlink`` to change the default OpenOCD
 runner to J-Link. Alternatively, you might add the following line to your
 application ``CMakeList.txt`` file.

   .. code-block:: cmake

      set(ZEPHYR_BOARD_FLASH_RUNNER jlink)

 If you use West (Zephyr's meta-tool) you can modify the default runner using
 the ``--runner`` (or ``-r``) option.

   .. code-block:: console

      west flash --runner jlink

 To attach a debugger to your board and open up a debug console with ``jlink``.

   .. code-block:: console

      west debug --runner jlink

 For more information about West and available options, see :ref:`west`.

 If you configured your Zephyr application to use `Segger RTT`_ console instead,
 open telnet:

   .. code-block:: console

      $ telnet localhost 19021
      Trying ::1...
      Trying 127.0.0.1...
      Connected to localhost.
      Escape character is '^]'.
      SEGGER J-Link V6.30f - Real time terminal output
      J-Link STLink V21 compiled Jun 26 2017 10:35:16 V1.0, SN=773895351
      Process: JLinkGDBServerCLExe
      Zephyr Shell, Zephyr version: 1.12.99
      Type 'help' for a list of available commands
      shell>

 If you get no RTT output you might need to disable other consoles which conflict
 with the RTT one if they are enabled by default in the particular sample or
 application you are running, such as disable UART_CONSOLE in menucon

 .. _jlink-external-debug-probe:

 J-Link External Debug Probe
 ***************************

 `Segger J-Link`_ is a family of external debug probes, including J-Link EDU,
 J-Link PLUS, J-Link ULTRA+, and J-Link PRO, that support a large number of
 devices from different hardware architectures and vendors.

 This debug probe is compatible with the following debug host tools:

 - :ref:`jlink-debug-host-tools`
 - :ref:`openocd-debug-host-tools`

 Install the debug host tools before you program the firmware.

 .. _LPCScrypt:
    https://www.nxp.com/lpcscrypt

 .. _Firmware for LPCXpresso:
    https://www.segger.com/products/debug-probes/j-link/models/other-j-links/lpcxpresso-on-board/

 .. _OpenSDA DAPLink Board-Specific Firmwares:
    https://www.nxp.com/opensda

 .. _OpenSDA J-Link Generic Firmwares:
    https://www.segger.com/downloads/jlink/#JLinkOpenSDAGenericFirmwares

 .. _OpenSDA J-Link Board-Specific Firmwares:
    https://www.segger.com/downloads/jlink/#JLinkOpenSDABoardSpecificFirmwares

 .. _Segger J-Link:
    https://www.segger.com/products/debug-probes/j-link/

 .. _Segger over ST-Link:
    https://www.segger.com/products/debug-probes/j-link/models/other-j-links/st-link-on-board/

 .. _Segger RTT:
     https://www.segger.com/jlink-rtt.html
	.. _debug-probes:

	Debug Probes
	############

	A debug probe is special hardware which allows you to control execution of a
	Zephyr application running on a separate board. Debug probes usually allow
	reading and writing registers and memory, and support breakpoint debugging of
	the Zephyr application on your host workstation using tools like GDB. They may
	also support other debug software and more advanced features such as
	:ref:`tracing program execution <tracing>`. For details on the related host
	software supported by Zephyr, see :ref:`debug-host-tools`.

	Debug probes are usually connected to your host workstation via USB; they
	are sometimes also accessible via an IP network or other means. They usually
	connect to the device running Zephyr using the JTAG or SWD protocols. Debug
	probes are either separate hardware devices or circuitry integrated into the same
	board which runs Zephyr.

	Many supported boards in Zephyr include a second microcontroller that serves as
	an onboard debug probe, usb-to-serial adapter, and sometimes a drag-and-drop
	flash programmer. This eliminates the need to purchase an external debug probe
	and provides a variety of debug host tool options.

	Several hardware vendors have their own branded onboard debug probe
	implementations: NXP LPC boards have LPC-Link2, NXP Kinetis (former Freescale)
	boards have OpenSDA, and ST boards have ST-LINK. Each onboard debug probe
	microcontroller can support one or more types of firmware that communicate with
	their respective debug host tools. For example, an OpenSDA microcontroller can
	be programmed with DAPLink firmware to communicate with pyOCD or OpenOCD debug
	host tools, or with J-Link firmware to communicate with J-Link debug host
	tools.

	Some supported boards in Zephyr do not include an onboard debug probe and
	therefore require an external debug probe. In addition, boards that do include
	an onboard debug probe often also have an SWD or JTAG header to enable the use
	of an external debug probe instead. One reason this may be useful is that the
	onboard debug probe may have limitations, such as lack of support for advanced
	debuggers or high-speed tracing. You may need to adjust jumpers to prevent the
	onboard debug probe from interfering with the external debug probe.

	.. _lpclink2-jlink-onboard-debug-probe:

	LPC-Link2 J-Link Onboard Debug Probe
	************************************

	The LPC-Link2 J-Link is an onboard debug probe and usb-to-serial adapter
	supported on many NXP LPC and i.MX RT development boards.

	This debug probe is compatible with the following debug host tools:

	- :ref:`jlink-debug-host-tools`

	This probe is realized by programming the LPC-Link2 microcontroller with J-Link
	LPC-Link2 firmware. Download and install `LPCScrypt`_ to get the firmware and
	programming scripts.

	.. note:: Verify the firmware supports your board by visiting `Firmware for LPCXpresso`_

	1. Put the LPC-Link2 microcontroller into DFU boot mode by attaching the DFU
	jumper, then powering up the board.

	#. Run the ``program_JLINK`` script.

	#. Remove the DFU jumper and power cycle the board.

	.. _opensda-daplink-onboard-debug-probe:

	OpenSDA DAPLink Onboard Debug Probe
	***********************************

	The OpenSDA DAPLink is an onboard debug probe and usb-to-serial adapter
	supported on many NXP Kinetis and i.MX RT development boards. It also includes
	drag-and-drop flash programming support.

	This debug probe is compatible with the following debug host tools:

	- :ref:`pyocd-debug-host-tools`
	- :ref:`openocd-debug-host-tools`

	This probe is realized by programming the OpenSDA microcontroller with DAPLink
	OpenSDA firmware. NXP provides `OpenSDA DAPLink Board-Specific Firmwares`_.

	Install the debug host tools before you program the firmware.

	As with all OpenSDA debug probes, the steps for programming the firmware are:

	1. Put the OpenSDA microcontroller into bootloader mode by holding the reset
	button while you power on the board. Note that "bootloader mode" in this
	context applies to the OpenSDA microcontroller itself, not the target
	microcontroller of your Zephyr application.

	#. After you power on the board, release the reset button. A USB mass storage
	device called BOOTLOADER or MAINTENANCE will enumerate.

	#. Copy the OpenSDA firmware binary to the USB mass storage device.

	#. Power cycle the board, this time without holding the reset button. You
	should see three USB devices enumerate: a CDC device (serial port), a HID
	device (debug port), and a mass storage device (drag-and-drop flash
	programming).

	.. _opensda-jlink-onboard-debug-probe:

	OpenSDA J-Link Onboard Debug Probe
	**********************************

	The OpenSDA J-Link is an onboard debug probe and usb-to-serial adapter
	supported on many NXP Kinetis and i.MX RT development boards.

	This debug probe is compatible with the following debug host tools:

	- :ref:`jlink-debug-host-tools`

	This probe is realized by programming the OpenSDA microcontroller with J-Link
	OpenSDA firmware. Segger provides `OpenSDA J-Link Generic Firmwares`_ and
	`OpenSDA J-Link Board-Specific Firmwares`_, where the latter is generally
	recommended when available. Board-specific firmwares are required for i.MX RT
	boards to support their external flash memories, whereas generic firmwares are
	compatible with all Kinetis boards.

	Install the debug host tools before you program the firmware.

	As with all OpenSDA debug probes, the steps for programming the firmware are:

	1. Put the OpenSDA microcontroller into bootloader mode by holding the reset
	button while you power on the board. Note that "bootloader mode" in this
	context applies to the OpenSDA microcontroller itself, not the target
	microcontroller of your Zephyr application.

	#. After you power on the board, release the reset button. A USB mass storage
	device called BOOTLOADER or MAINTENANCE will enumerate.

	#. Copy the OpenSDA firmware binary to the USB mass storage device.

	#. Power cycle the board, this time without holding the reset button. You
	should see two USB devices enumerate: a CDC device (serial port) and a
	vendor-specific device (debug port).

	.. _stlink-v21-onboard-debug-probe:

	ST-LINK/V2-1 Onboard Debug Probe
	********************************

	ST-LINK/V2-1 is a serial and debug adapter built into all Nucleo and Discovery
	boards. It provides a bridge between your computer (or other USB host) and the
	embedded target processor, which can be used for debugging, flash programming,
	and serial communication, all over a simple USB cable.

	It is compatible with the following host debug tools:

	- :ref:`openocd-debug-host-tools`
	- :ref:`jlink-debug-host-tools`

	For some STM32 based boards, it is also compatible with:

	- :ref:`pyocd-debug-host-tools`

	While it works out of the box with OpenOCD, it requires some flashing
	to work with J-Link. To do this, SEGGER offers a firmware upgrading the
	ST-LINK/V2-1 on board on the Nucleo and Discovery boards. This firmware makes
	the ST-LINK/V2-1 compatible with J-LinkOB, allowing users to take advantage of
	most J-Link features like the ultra fast flash download and debugging speed or
	the free-to-use GDBServer.

	More informations about upgrading ST-LINK/V2-1 to JLink or restore ST-Link/V2-1
	firmware please visit: `Segger over ST-Link`_

	Flash and debug with ST-Link
	============================

	Using OpenOCD
	-------------

	OpenOCD is available by default on ST-Link and configured as the default flash
	and debug tool. Flash and debug can be done as follows:

	.. zephyr-app-commands::
	:zephyr-app: samples/hello_world
	:goals: flash

	.. zephyr-app-commands::
	:zephyr-app: samples/hello_world
	:goals: debug


	Using Segger J-Link
	-------------------

	Once STLink is flashed with SEGGER FW and J-Link GDB server is installed on your
	host computer, you can flash and debug as follows:

	Use CMake with ``-DZEPHYR_BOARD_FLASH_RUNNER=jlink`` to change the default OpenOCD
	runner to J-Link. Alternatively, you might add the following line to your
	application ``CMakeList.txt`` file.

	.. code-block:: cmake

	set(ZEPHYR_BOARD_FLASH_RUNNER jlink)

	If you use West (Zephyr's meta-tool) you can modify the default runner using
	the ``--runner`` (or ``-r``) option.

	.. code-block:: console

	west flash --runner jlink

	To attach a debugger to your board and open up a debug console with ``jlink``.

	.. code-block:: console

	west debug --runner jlink

	For more information about West and available options, see :ref:`west`.

	If you configured your Zephyr application to use `Segger RTT`_ console instead,
	open telnet:

	.. code-block:: console

	$ telnet localhost 19021
	Trying ::1...
	Trying 127.0.0.1...
	Connected to localhost.
	Escape character is '^]'.
	SEGGER J-Link V6.30f - Real time terminal output
	J-Link STLink V21 compiled Jun 26 2017 10:35:16 V1.0, SN=773895351
	Process: JLinkGDBServerCLExe
	Zephyr Shell, Zephyr version: 1.12.99
	Type 'help' for a list of available commands
	shell>

	If you get no RTT output you might need to disable other consoles which conflict
	with the RTT one if they are enabled by default in the particular sample or
	application you are running, such as disable UART_CONSOLE in menucon

	.. _jlink-external-debug-probe:

	J-Link External Debug Probe
	***************************

	`Segger J-Link`_ is a family of external debug probes, including J-Link EDU,
	J-Link PLUS, J-Link ULTRA+, and J-Link PRO, that support a large number of
	devices from different hardware architectures and vendors.

	This debug probe is compatible with the following debug host tools:

	- :ref:`jlink-debug-host-tools`
	- :ref:`openocd-debug-host-tools`

	Install the debug host tools before you program the firmware.

	.. _LPCScrypt:
	https://www.nxp.com/lpcscrypt

	.. _Firmware for LPCXpresso:
	https://www.segger.com/products/debug-probes/j-link/models/other-j-links/lpcxpresso-on-board/

	.. _OpenSDA DAPLink Board-Specific Firmwares:
	https://www.nxp.com/opensda

	.. _OpenSDA J-Link Generic Firmwares:
	https://www.segger.com/downloads/jlink/#JLinkOpenSDAGenericFirmwares

	.. _OpenSDA J-Link Board-Specific Firmwares:
	https://www.segger.com/downloads/jlink/#JLinkOpenSDABoardSpecificFirmwares

	.. _Segger J-Link:
	https://www.segger.com/products/debug-probes/j-link/

	.. _Segger over ST-Link:
	https://www.segger.com/products/debug-probes/j-link/models/other-j-links/st-link-on-board/

	.. _Segger RTT:
	https://www.segger.com/jlink-rtt.html