Is it possible to have faster tick rates on FreeRTOS?

[eduardo_reis]

I was about to configure the FreeRTOS for my project when I noticed the following:

TICK_RATE_HZ
TICK_RATE_HZ must be between 1 and 1 000.
Parameter Description:
Sets the tick interrupt frequency. The value is specified in Hz.
Warning:
The max value is 1000, as higher values generate compilation errors (division by zero)

Does it mean 1000Hz is the fastest FreeRTOS can work with, and anything else should follow a bare-metal approach?

I found this related topic, but it is not clear to me if that applies to STM32. Hence, I would appreciate the opinion of the experts here.

[AScha.3]

I am not an expert for rtos...but what the AI says :

According to the search results, a moderate task switch rate is around 300 per second per processor. However, this rate can vary depending on the system’s usage and configuration.

>Does it mean 1000Hz is the fastest FreeRTOS can work with, and anything else should follow a bare-metal approach?

Right.

>but it is not clear to me if that applies to STM32.

This is not specific for a cpu - its the rtos system, you choose. Look at Azure, standard is 10ms tick.

But you can set it up to 1ms, same as FreeRTOS .

[Andrew Neil · Accepted solution]

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@eduardo_reis wrote:

Does it mean 1000Hz is the fastest FreeRTOS can work 

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It means what it says - that is the fastest tick rate that is allowed*.

Note that this doesn't mean the fastest CPU clock rate which can be used...

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@eduardo_reis wrote:

it is not clear to me if that applies to STM32. 

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It's not specific to any particular microcontroller - it's a FreeRTOS thing.

So you'd be better asking on the FreeRTOS forums.

EDIT:

*  Actually, from the post you cited, and others such as this:

https://forums.freertos.org/t/freertos-high-tick-rate-for-machine-control/6913

it seems that tick rates >1kHz are possible - but strongly advised against.

Both of those posts give some reasons why it could be a Bad Thing.

You'd probably be best explaining your actual goal on the FreeRTOS forums, and asking them for their advice on how best to achieve that within FreeRTOS.