Re: Does FreeRTOS works on Linux?

On Fri, May 07, 2021 at 10:14:34PM +0530, Raul Piper wrote:

On Fri, May 7, 2021 at 12:07 PM Greg KH [off-list ref] wrote:

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On Thu, May 06, 2021 at 08:12:48PM +0530, Raul Piper wrote:

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On Thu, May 6, 2021 at 1:01 AM loďc tourlonias
[off-list ref] wrote:

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On Wed, May 5, 2021 at 8:07 PM Raul Piper [off-list ref]

wrote:

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Hello,

Hi

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I am having an embedded linux system and wanted to use any  RTOS on
it. Can I use Free RTOS?
My project has 2 tasks , one is producer and another is consumer
working parallely.

I'm afraid I don't understand what you are requesting and I hope that
someone else understand more clearly. But I'll still explain my
understanding.
You want to run a RTOS upon Linux OS, doesn't make it too much OSes?
Then I have several questions:
Do you really need a Real Time Operating System, can't you run your
project in Linux userspace?

I can do that but Linux is not an ROS afaik. Even though i dont have
strict timing requirements , its like a sensor on i2c(producer) and
then another consumer tasks which not
only feeds on this data but also tell the i2c sensor by sending some
commands to it.

That should be fine, Linux can be a "Real Time Operating system" if you
use the RT patchset if your workloads require it.

OK I need to check on this RT Patchset if at all I need real time features.

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If you do NOT have strict timing requirements, then there is no need to
worry about any of this, so I do not understand your wish to slow your
system down by running a "ROS".  Why?

Typo this is RTOS (not R OS - Robot operating system ;) )

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Have you tried Linux RTOS extension (again I'm no expert and haven't
tried them but you can look at Xenomai)?

I will explore this.I was thinking if i can use Posix thread to have
two tasks one reading sensors and another sending commands to it.But
then again i am confused
if using a posix thread full fills the requirement of RTOS. The reason
I want to use RTOS is , I am porting a Microcontroller code using RTOS
(free RTOS) to Linux and
afaik FreeRTOS doesnt work on Linux.

What is your "requirement" exactly?

Read the data from the sensor and also change the type of data sent by the
sensor by analysing the received data by sending the command to the sensor
periodically based on trigger.There is some batch of data which a
"simultaneously" running algorithm
is evaluating and send the command based on calculated trigger,  to sensor
to change the data stream.This batch of data is of size 40-60 bytes length
and may vary each time a batch is  being read.
So in summary i wany two tasks to run together.
RTOS is one option
Posix thread is Another

"real time" has nothing to do with "posix threads" at all.

I suggest reading up on what these terms really mean and figure out your
specific requirements to determine what you have to do here.

good luck!

greg k-h

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