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Debugging Mynewt
If you run into issues with Mynewt applications, you may need to use the debugger. This page will show
you how to set up and use the debugger in Mynewt.
.. contents::
:depth: 2
- You have installed the Newt tool and toolchains on your machine. Visit the :doc:`Native Installation <native_install/index>` page to get started.
- You have run through one of the tutorials, created a project, or have an existing one.
- Familiarity with GDB; for more information refer to the `GDB documentation <>`__.
Starting the Debugger
Mynewt uses GDB to debug applications. To open a debugger session for Mynewt, you can run
either of the following newt commands:
- ``newt debug <target_name>``
- ``newt run <target_name> <version_number>``
The ``newt debug`` command will start the debugger for the specified target. That target
should be running on the device you are debugging on. For more information on the command, take a look at
the :doc:`command structure in the Newt Tool Guide <../../../../../newt/command_list/newt_debug>`.
The ``newt run`` command also starts the debugger, but will also build the target, create
an image with the specified version number, and load it onto the board. More details on its usage and syntax are
on the :doc:`Newt Tool command guide <../../../../newt/command_list/newt_run>`.
Starting the debugger will bring up the GDB session in the console:
.. code:: console
~/test/1.5 $ newt debug pca40blinky
[/Users/dlee/test/1.5/repos/apache-mynewt-core/hw/bsp/nordic_pca10040/ /Users/dlee/test/1.5/repos/apache-mynewt-core/hw/bsp/nordic_pca10040 bin/targets/pca40blinky/app/apps/blinky/blinky]
Debugging bin/targets/pca40blinky/app/apps/blinky/blinky.elf
GNU gdb (GNU Tools for Arm Embedded Processors 7-2018-q2-update)
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Reading symbols from bin/targets/pca40blinky/app/apps/blinky/blinky.elf...done.
os_tick_idle (ticks=128)
at repos/apache-mynewt-core/hw/mcu/nordic/nrf52xxx/src/hal_os_tick.c:164
164 if (ticks > 0) {