Thread Management

• Thread Control Block
• Creating Threads
• Threads Priorities
• Thread States
• Main and Idle Threads
• Delays
• Changing Thread Priority
• Suspending Threads
• Kernel Structures
  • Simple linked-list ready queue
  • Red/black tree ready queue
  • Traditional multi-queue ready queue
• Thread Custom Data
• Scheduling Traces
  • Runtime Statistics
  • User-Defined Tracing
  • Percepio Tracealyzer

Exercise: Create and manage threads

Exercise: Create periodic threads

Exercise: Create config overlay for visual trace diagnostics using Tracealyzer

Memory Management in Zephyr

• Memory Managers
• Dynamic memory managers
  • K_heap
  • System heap
  • Memory Slabs
  • Memory Blocks
• Heap Listeners
• Memory Domains and Partitions
• Stack Overflow detection
• User Mode
• Memory Domains

Exercise: Understand dynamic memory allocation in Zephyr

Exercise: Display threads information and detect stack overflow

Resource Management

• Mutual Exclusion
• Critical Sections
• Mutexes
• Gatekeeper threads
• Atomic
• Lock-Free Data Structures
• SpinLocks

Exercise: Implement mutual exclusion between threads

Synchronization Primitives

• Synchronization
• Semaphores
• The Readers/Writer Problem
• Condition variables
• Events and Event Groups
• Polling

Exercise: The producer-consumer problem, synchronize and avoid concurrent access problems

Exercise: Understanding event bit group by synchronizing several threads

Data Passing

• Message Queues
• Pipes
• Queues
  • FIFOs
  • LIFOs
• Mailboxes
• Stacks

Exercise: Create a print gatekeeper thread using message queue

Interrupt Management

• Threads and Interrupts
• Interrupts in zephyr
• Interrupts on ARM
• Handler thread
• Queue within an ISR
• Workqueue Threads
• Power Management

Exercise: Understand how to wait on multiple events and interrupt safe APIs

Exercise: Understand how to pass data using Queues from an interrupt to a thread

Exercise: Create and submit work items from interrupts to custom WorkQueue

Software Timers

• Timers
  • Defining a Timer
  • Using a Timer Expiry Function
• Timer types
  • One-shot timers
  • Auto-reload timers
• Timer Commands

Exercise: Understand the use of one-shot and auto-reload timers

Modules

• Why to use modules?
• Module structure
• Out-of-tree module
• YAML files
• Module CMakeLists.txt
• How to add and use custom Kconfigs

Exercise: Create a simple hello world module

Exercise: Create a module that uses custom Kconfig options

Zephyr device driver model

• Introduction to Device Drivers
• Overview of the Zephyr device driver model
• Standard Drivers
• The struct device
• Subsystems
• API Extensions
• Initialization Levels
• Dependencies between device drivers
• Define devices programmatically
• Adding In-Tree Code to Zephyr Source Code

Exercise: Create a driver that respects the Zephyr Device Driver Model and define devices

Exercise: Writing in-tree drivers

Device Trees in Zephyr

• Overview of Device Tree (DT) and its role in Zephyr
• Device Tree VS Kconfig
• Device Tree node structure
• Device Tree bindings
• Overlay and yaml files
• APIs to access device tree properties
• Write device drivers using device tree APIs
• Device Tree in Zephyr VS Linux

Exercise: Create a driver that uses custom device tree and Kconfig