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FreeRTOS FAQ Contents
[Contact and Support]

How to get the most from the FreeRTOS support forum

My application does not run, what could be wrong?

Amazon
Why have Amazon taken stewardship of FreeRTOS?
What is "Amazon FreeRTOS", and how does it differ from "FreeRTOS"?
Do I have to be an Amazon Web Services (AWS) customer to use FreeRTOS?
Can I use FreeRTOS to connect to any cloud service?
Are Amazon also investing in the FreeRTOS kernel as a standalone component?
Have Amazon forked FreeRTOS?
What about the FreeRTOS.org website?

What Is This All About?
What is a Real Time Operating System (RTOS)?
What is a Real Time Kernel?
What is a Real Time Scheduler?
How do I use FreeRTOS?
How do I get started?
Why use an RTOS?

Ports
Will FreeRTOS run under Windows?
Are the NNN development tools supported?
Is the NNN microcontroller supported?
How do I create a new port?
What is the difference between an official port, and an unsupported port?

Memory Usage, Boot Times, Context Switch Times
How much RAM does FreeRTOS use?
How much ROM does FreeRTOS use?
How long does FreeRTOS take to boot?
How long does a context switch take?
Why do queues use that much RAM?
How can I reduce the amount of RAM used?
How is RAM allocated to tasks?
How is RAM allocated to queues?
How big should a task stack be?

Licensing
Can I use FreeRTOS in a commercial project?
Do I have to give away my application source code if I use FreeRTOS?

Scheduling
How are tasks of equal priority scheduled?
How are tasks that share the idle priority scheduled?

ISR's
Can a context switch occur within an ISR?
How do I write an RTOS safe ISR?
Can interrupts be nested?





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Latest News

FreeRTOS kernel V10.0.1 is available for immediate download. Now MIT licensed.

Video: Watch James Gosling & Richard Barry at re:Invent, Las Vegas 2017.

New FAQ page about the FreeRTOS kernel and Amazon FreeRTOS.


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner