Give the sample a concise name that corresponds to the folder name. If the sample targets a specific protocol or device, add it in the title before the sample name (for example, “NFC:” or “Cellular:”). Do not include the word “sample” in the title.
Put the documentation inside the sample folder and use the file name
Use the provided stock phrases and includes when possible.
Sections with * are optional and can be left out. All other sections are required for all samples. Do not add new sections (unless in the sections that allow for further subsections) without discussion with the tech writer team.
The Sample sample demonstrates how to blink LEDs in the rhythm of the music that is played.
Explain what this sample demonstrates in one, max two sentences (full sentences, not sentence fragments). This introduction should give users a clear idea of what the sample can be used for.
Think about use cases: “The XYZ sample shows how to use the XYZ library” is not a good introduction, because customers do not want to use the XYZ library, but they want to get a task done. Instead, write something like “The XYZ sample shows how to do this awesome task. It uses the XYZ library”.
Supported kits are listed in a table, which is composed of rows from the
doc/nrf/includes/sample_board_rows.txtfile. Select the required rows in the
:rows:configuration, or use the
.. table-from-sample-yaml::directive to include all build targets specified in the
If only one kit is supported, replace the introduction text with “The sample supports the following development kit:”.
If several kits are required to test the sample, state it after the table (for example, “You can use one or more of the development kits listed above and mix different development kits.”).
Mention additional requirements after the table.
If TFM is included in the sample, add
.. include:: /includes/tfm.txtto include the standard text that states this.
The sample supports the following development kits:
The sample also requires …
When built for an
_ns build target, the sample is configured to compile and run as a non-secure application with Cortex-M Security Extensions enabled.
Therefore, it automatically includes Trusted Firmware-M that prepares the required peripherals and secure services to be available for the application.
You can use this sample as a starting point to implement a disco light.
The sample uses the
:ref:RST link library to control the LEDs.
In addition, it uses the
:ref:RST link sound sensor and hooks up to some Internet service to download cool blinking sequences.
Continue the explanation on what this sample is about. What does it show, and why should users try it out? What is the practical use? How can users extend this sample? What libraries are used (link to them)?
Add subsections for technical details. Give them a suitable title (sentence style capitalization, thus only the first word capitalized). If there is nothing important to point out, do not include any subsections.
The sample repeatedly calls function ABC, which …
Do not just list the functions that are called, but clarify general concepts or explain parts of the implementation that might be unintuitive for some reason.
Connect PIN1 to PIN2, then cut the connection again.
Add button and LED assignments here, plus other information related to the user interface (for example, supported commands).
- Button 1:
- Button 2:
- LED 1:
On when connected.
- LED 2:
Always include this section if your sample can be configured by the user.
Start with the stock phrase that is included with
See Configuring your application for information about how to permanently or temporarily change the configuration.
Add information about the initial setup here, for example, that the user must install or enable some library before they can compile this sample, or set up and select a specific backend. Most samples do not need this section.
You do not need to list all configuration options of the sample, but only the ones that are important for the sample and make sense for the user to know about.
The syntax below allows sample configuration options to link to the option descriptions in the same way as the library configuration options link to the corresponding Kconfig descriptions (
:kconfig:option:`SAMPLE_CONFIG`, which results in
For each configuration option, list the symbol name and the string describing it.
For the nRF Connect for VS Code extension instructions, list the configuration options as they are stated on the Generate Configuration screen.
Check and configure the following Kconfig options:
The sample configuration defines …
This configuration option specifies …
Use SAMPLE_CONFIG to link to sample specific option.
Add this section to describe and link to any library configuration options that might be important to run this sample. You can link to options with
You do not need to list all possible configuration options, but only the ones that are relevant.
Check and configure the following library options that are used by the sample:
Add this section if the sample provides predefined configuration files.
The sample provides predefined configuration files for typical use cases.
You can find the configuration files in the
The following files are available:
filename.conf- Specific scenario. This configuration file …
Include the standard text for building - either
.. include:: /includes/build_and_run.txtor
.. include:: /includes/build_and_run_ns.txtfor the build targets that use Cortex-M Security Extensions.
The main supported IDE for nRF Connect SDK is Visual Studio Code, with the nRF Connect for VS Code extension installed. Therefore, build instructions for the nRF Connect for VS Code extension are required. Build instructions for the command line are optional.
See the link to the nRF Connect for Visual Studio Code documentation site for basic instructions on building with the extension.
If the sample uses a non-standard setup, point it out and link to more information, if possible.
This sample can be found under
samples/XXX in the nRF Connect SDK folder structure.
To build the sample with Visual Studio Code, follow the steps listed on the How to build an application page in the nRF Connect for VS Code extension documentation. See Building and programming an application for other building and programming scenarios and Testing and debugging an application for general information about testing and debugging in the nRF Connect SDK.
Note that this sample enables the XXX stack. See REF for more information.
If required, add subsections for additional build instructions. Use these subsections sparingly and only if the content does not fit into other sections (mainly Configuration). If the additional build instructions are valid for other samples as well, consider adding them to the Configuration and building section instead and linking to them.
After programming the sample to your development kit, complete the following steps to test it:
Connect the kit to the computer using a USB cable. The kit is assigned a COM port (Windows) or ttyACM device (Linux), which is visible in the Device Manager.
Connect to the kit with a terminal emulator (for example, PuTTY). See How to connect with PuTTY for the required settings.
Press a button on the development kit.
Look at the flashing lights.
And so on …
Use the shortcuts provided in
doc/nrf/shortcuts.txtto keep the wording consistent.
If there are different ways of testing, introduce them in this section (for example, “After programming the sample to your development kit, you can test it either by …”) and add subsections for the different scenarios.
Add the full output of the sample in this section, or include parts of the output in the testing steps in the previous section.
The following output is logged on RTT:
If the LEDs do not start blinking, check if the music is loud enough.
Music chapter in the Bluetooth® Spec (-> always link)
Disco ball datasheet
Do not duplicate links that have been mentioned in other sections before.
Do not include links to documents that are common to all or many of our samples. For example, the Bluetooth Spec or the DK user guides are always important, but should not be listed.
Include specific links, like a chapter in the Bluetooth Spec if the sample demonstrates the respective feature, or a link to the hardware pictures in the DK user guide if there is a lot of wiring required, or specific information about the feature that is presented in the sample.
List all relevant libraries. Standard libraries (for example,
printk.h) do not need to be listed.
Delete the parts that are not relevant.
Drivers can be listed under libraries, no need for a separate part.
If possible, link to the respective library. If there is no documentation for the library, include the path.
Add the appropriate secure firmware component that the sample supports.
This sample uses the following nRF Connect SDK libraries:
It uses the following sdk-nrfxlib libraries:
It uses the following Zephyr libraries:
In addition, it uses the following secure firmware components:
The sample also uses drivers from nrfx.
Include this section only for applications (not samples), and only if there are internal modules that must be documented.