RTOS Firmware Programming

RTOS Firmware Programming · TESA Firmware SDK for Edge AI course

Objectives

Split work by responsibility and timing with FreeRTOS: tasks, priority, queues, mutexes, semaphores and event groups, along with the rules of an ISR.

Lessons

#	Lesson	Content
1	Multi-task firmware with FreeRTOS	Creating a periodic task, choosing a priority, passing data with a queue, protecting a bus with a mutex, signalling with a semaphore/event group, and respecting the rules of an ISR
2	Lab: multi-task firmware with FreeRTOS	Creating two tasks with different periods, passing a button event through a queue, protecting a shared bus with a mutex, then writing notes about timing

Approximate time per the original: about 3.5–4 hours (lessons) + a 2.5–3.5 hour lab.

Accompanying sheets and templates (in the resources/ folder of lesson 1):

• rtos-patterns.md

The C code in this module uses the API of the TESAIoT Bitstream firmware, which is not yet open source. Read the note at the top of the lesson before you start.

Checkpoint

Before moving to the next module, check that you can do the following:

• Two tasks blink an LED at different periods with no busy-waiting
• A button event travels through a queue to a task that prints over UART
• A shared resource is protected with a mutex or a bus-locking API
• Lab E’s timing questions are all answered

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