nRF Connect SDK Fundamentals

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Lesson 1 – nRF Connect SDK Introduction
3 Topics | 1 Quiz
nRF Connect SDK structure and content
Exercise 1 – Installing nRF Connect SDK and VS Code
Exercise 2 – Build and flash your first nRF Connect SDK application
Lesson 1 Quiz
Lesson 2 – Reading buttons and controlling LEDs
6 Topics | 1 Quiz
Devicetree
Device driver model
GPIO Generic API
Dissecting the blinky sample
Exercise 1 – Controlling an LED through a button (polling based)
Exercise 2 – Controlling an LED through a button (interrupt based)
Lesson 2 Quiz
Lesson 3 – Elements of an nRF Connect SDK application
4 Topics | 1 Quiz
Configuration files
Devicetree overlays, CMake, and build systems
Exercise 1 – Creating an application
Exercise 2 – Customizing the application
Lesson 3 Quiz
Lesson 4 – Printing messages to console and logging
5 Topics | 1 Quiz
printk() function
Logger module
Exercise 1 – Printing to the console
Exercise 2 – Using the logger module
Exercise 3 – Exploring the logger module features
Lesson 4 Quiz
Lesson 5 – Serial communication (UART)
3 Topics | 1 Quiz
UART Protocol
UART Driver
Exercise 1 – Controlling LEDs through UART
Lesson 5 Quiz
Lesson 6 – Serial communication (I2C)
4 Topics | 1 Quiz
I2C Protocol
I2C Driver
Exercise 1 – Connecting an BME280 temperature sensor
Exercise 2 – Connecting to the BH1749 Ambient Light Sensor on the Thingy:91 and Thingy:53
Lesson 6 Quiz
Lesson 7 – Multithreaded applications
5 Topics | 1 Quiz
Bare-metal vs RTOS programming
Zephyr RTOS basics
Exercise 1 – Thread creation and priorities
Exercise 2 – Time slicing
Exercise 3 – Workqueue creation and work item submission
Lesson 7 Quiz
Lesson 8 – Thread synchronization
5 Topics | 1 Quiz
Thread synchronization
Semaphores
Mutexes
Exercise 1 – Semaphores
Exercise 2 – Mutexes
Lesson 8 Quiz
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Thread synchronization

In a multithreaded application, there are multiple threads running concurrently. If more than one thread tries to access the same resource (variable, data structure, etc.) simultaneously, usually referred to as the critical section, this can lead to unexpected or erroneous behavior. This is where the need for thread synchronization arises; it’s a mechanism to ensure that only one thread executes the critical section at any given time.

Two mechanisms you can utilize to achieve thread synchronization are semaphores or mutexes. They have some differing properties, but in essence they are both variables that are changed before and after the critical section by a thread to make sure that no other threads can execute the segment before that thread has completed it. The main differences are that semaphores have a maximum value that is set at initialization, while mutexes have ownership property, i.e only the thread incrementing its value can decrement it, until zero when it is relinquished.

In the following sections, we will discuss in more detail about both semaphores and mutexes, including a list of properties and a visualization. There are also two exercises to be completed, practicing how to use semaphores and mutexes as thread synchronization mechanisms.

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      Change summary

      What's new in the latest version

      General updates

      General updates

      •Support for nRF54LS05 DK (Available through the early access sampling program)
      •Support for the nRF54LM20B with Axon NPU for Edge AI applications
      Bluetooth LE updates

      Bluetooth LE updates

      •Quality of Service module is now production-ready.
      •New experimental features for RF testing (Direct Test Mode) and low-latency packet handling (LE Flushable ACL).
      MCUboot & Partition Manager

      MCUboot & Partition Manager

      •Single-Slot DFU and RAM Load mode are both promoted to fully supported
      •Partition Manager is officially deprecated in favor of Zephyr's devicetree-based partitioning.
      General updates

      General updates

      •Added comprehensive support for the nRF54L Series.
      •Bug fixes and improvements.
      •Hardware model v1, which was deprecated in nRF Connect SDK 2.7.0, has now been removed.
      •Multi-image builds functionality (parent-child images), which was deprecated in nRF Connect SDK v2.7.0 has now been removed.
      Bluetooth LE updates

      Bluetooth LE updates

      •Added support for Bluetooth Core version 6.2.
      •Added support for Bluetooth LE Shorter Connection Intervals.
      •Added support for Bluetooth LE Channel Sounding.
      Bootloader updates

      Bootloader updates

      •Support for MCUboot image compression.
      •Single slot DFU support for the nRF54L Series.
      •Encrypted DFU support using ECIES on the nRF54L15, nRF54LM20, and nRF54LV10 SoCs.