Learn FREERTOS with Real Code Examples
Updated Nov 27, 2025
Practical Examples
Blink LED with periodic task
UART communication using queues
Sensor data acquisition with mutex protection
Motor control with priority tasks
Low-power IoT node using tickless idle
Troubleshooting
Check stack size for each task
Verify task priorities to avoid starvation
Monitor queue overflow or underflow
Debug using FreeRTOS+Trace or RTT
Ensure ISR compatibility with kernel APIs
Testing Guide
Unit test individual tasks
Simulate queues and semaphores
Verify ISR-task interaction
Check task scheduling with priority inversion
Perform long-duration stress testing
Deployment Options
Direct to microcontroller flash
Simulated environment on PC (POSIX port)
IoT edge devices with FreeRTOS+TCP
Industrial MCU boards
Battery-powered embedded sensors
Tools Ecosystem
Official FreeRTOS Kernel
FreeRTOS+TCP and +FAT modules
Tracealyzer for task monitoring
Segger SystemView for real-time debugging
Vendor-specific BSP and HAL libraries
Integrations
IoT connectivity stacks (MQTT, LwIP)
Peripheral driver libraries
Hardware abstraction layers
Debugging/profiling tools
Power management and low-power APIs
Productivity Tips
Use templates for tasks and queues
Keep tasks short and modular
Enable kernel-aware debugging
Profile using tracing tools
Regularly check stack and heap usage
Challenges
Avoiding priority inversion
Debugging concurrency issues
Optimizing memory footprint
Ensuring deterministic timing
Porting to new microcontrollers