Difference between revisions of "STM32 FreeRTOS"
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=== Semaphores and Mutexes === | === Semaphores and Mutexes === | ||
Revision as of 06:17, 30 October 2024
FreeRTOS is a real-time operating system for embedded systems. On MCUs based on ARM Cortex-M cores a standardised API exists which is known as CMSIS RTOS. This API is built on top of FreeRTOS. Two different versions of CMSIS RTOS exists: v1 and v2. Except from the queue handling they are almost identical.
STM32CubeMX includes an option to use FreeRTOS. In an earlier life, I did quite a lot of development on ESP32, and that, due to it's dual-core design, is very much centred around FreeRTOS. Back the, I grew to hate FreeRTOS.
The examples on this page is using a STM32F411 based Black Pill development board.
Concepts
While FreeRTOS call itself a "real-time operating system" it is essentially merely a task manager and scheduler.
Multiple tasks can be created and each task will have it's own reserved stack and heap space.
Tasks
Tasks are essentially an endless loop and the task can operate in one of four different states:
- Running
- Blocked
- Suspended
- Ready
STM32CubeIDE
Queues can be added and modified through STM32CubeMX. Here is a list of queues:
Clicking "Add" or double clicking on any of the existing tasks will pop up an edit window:
Semaphores and Mutexes
To be added
Queues
To be added