MPSL timeslot

This sample demonstrates how to use Multiprotocol Service Layer and basic MPSL Timeslot functionality.


The sample supports any one of the following development kits:

Hardware platforms


Board name

Build target

nRF5340 DK




nRF52 DK




nRF52840 DK





For the nRF5340 DK, this sample is only supported on the network core (nrf5340dk_nrf5340_cpunet), and the nRF5340: Empty firmware for application core sample must be programmed to the application core.


The sample opens a timeslot session and starts requesting timeslots when a key is pressed in the terminal.

  • If a is pressed, the callback for the first timeslot requests a new timeslot.

  • If b is pressed, the callback for the first timeslot ends the timeslot.

The first timeslot is always of type “earliest”. Any following timeslots are of type “normal”. In each timeslot callback, the signal type of the callback is posted to a message queue. Upon reception of the timeslot start signal, timer0 is configured to be triggered before the timeslot ends. A separate thread reads the message queue and prints the timeslot signal type. The timeslot session is closed when any key is pressed in the terminal.

Building and running

This sample can be found under samples/mpsl/timeslot 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 Configuring and building an application for other building scenarios, Programming an application for programming steps, and Testing and optimization for general information about testing and debugging in the nRF Connect SDK.


After programming the sample to your development kit, complete the following steps to test it:

  1. Connect to the kit with a terminal emulator (for example, nRF Connect Serial Terminal). See Testing and optimization for the required settings and steps.

  2. Follow the instructions in the terminal to open a session and start requesting timeslots. The terminal then prints the signal type for each timeslot callback:

    • If you press a, the timeslot callback requests a new timeslot. Observe that Timeslot start and Timer0 signal are printed until the session is closed.

    • If you press b, the timeslot callback ends the timeslot. Observe that Timeslot start and Timer0 signal are printed, followed by Session idle.


This sample uses the following sdk-nrfxlib libraries:

In addition, it uses the following Zephyr libraries:

  • include/console.h

  • Kernel Services:

    • include/kernel.h

    • include/irq.h

  • include/sys/printk.h

  • include/zephyr/types.h