nRF5340: Empty firmware for application core

• Requirements
• Overview
• Building and running
  • Testing
• Dependencies

You can use this sample to run an application on the network core of the nRF5340 when there is no need for the working application core.

Requirements

The sample supports the following development kit:

.. table-from-sample-yaml::

Overview

The sample has a minimal Zephyr configuration: no multithreading, no clock, no MPU, no device drivers. It does the following:

• During system initialization:
  • It allows the network core to access GPIO pins for LEDs and buttons. If more pins are required, you can add them to the :c:func:`network_gpio_allow` function.
  • It starts the network core. This is not done directly in the source code of the sample, but internally by Zephyr.
• In the :c:func:`main` function of the sample:
  • The application RAM is powered off to reduce power consumption.
  • The application core is suspended indefinitely.

Building and running

Testing

To test the sample, complete the following steps:

1. Program the sample to the application core.
2. Program Zephyr's :ref:`zephyr:blinky-sample` sample to the network core.
3. Observe the LEDs on the kit.

Dependencies

This sample has the following `nrfx`_ dependencies:

• nrfx/nrf.h
• nrfx/nrfx.h

In addition, it uses the following Zephyr libraries:

• :ref:`zephyr:kernel_api`:
  • include/init.h