Hi Huan, I'm curious how external interrupt handling works with Nuttx layered
on top of Linux? The last layered system I looked at along these lines used
poll system calls by the app with file descriptors to detect state changes
triggered by the hardware interrupt seen by the Linux kernel. The "realtime"
attribute was right out the window with this because the Linux scheduler was
involved so latency was effectively random up to multiples of milliseconds.
Even if a thread could be bound to a core it was impossible to see how to
achieve hard real time app layer response to a hardware interrupt with Linux.
So I'm curious how Greg has cracked this nut. :-)But I know many of us are
curious to know what you're scouting RTOS choices to implement?PetePS In case
it's unfamiliar to others, "hard realtime" is jargon that implies a strict
guarantee of timing tolerances and that no, meeting the spec 99% of the time is
not success. But we don't know if that's relevant here. I'm just biased about
systems bandying about "RTOS" when in some circumstances they are "WTOS" with
the "W" standing for "whenever, man, but usually we're cool". :-)
-------- Original message --------From: Huan Truong <[email protected]> Date:
2/18/19 1:54 AM (GMT-05:00) To: Mike Lisanke <[email protected]> Cc: Pete
Soper <[email protected]>, Triangle Embedded Interest Group <[email protected]>
Subject: Re: [TriEmbed] NuttX There is even a lovely Youtube channel that one
of the developers (Ithink?) talk about getting various things done on NuttX. I
like hiseasy-to-follow video style, and the menuconfig is my favorite
ofNuttX.https://www.youtube.com/channel/UC0QciIlcUnjJkL5yJJBmluw/videosI have
just ordered a Electron Photon board which they say theysupport to test out. I
recently worked with the ESP32 and was really,really impressed by how organized
and easy to get things done withFreeRTOS on ESP32. At the same time, having
being able to port realLinux programs to it is going to be a huge boon for
me.On Sun, Feb 17, 2019 at 7:41 PM Mike Lisanke via
TriEmbed<[email protected]> wrote:>> Small footprint AND not Owned by
Amazon :-p>> On Sun, Feb 17, 2019 at 2:59 PM Pete Soper via TriEmbed
<[email protected]> wrote:>>>> On 2/17/19 2:04 PM, Huan Truong via TriEmbed
wrote:>>>> Anyone worked with NuttX? This is the first time I've heard of
NuttX>> when I searched for FreeRTOS and NuttX came up.>>>>
https://www.embedded.com/electronics-blogs/say-what-/4458729/What-is-the-NuttX-RTOS-and-why-should-you-care->>>>
"NuttX is a POSIX RTOS. You don’t need to learn a new API to program>> it. You
can write an application in a POSIX Operating System like>> Linux or MacOS,
validate it, and then compile it to run on NuttX. If>> you don't want to create
an application from scratch, you can grab>> some small Linux libraries and
perform some minor modifications to get>> them working on NuttX.">>>> Hi
Huan!>>>> I'd never heard of it. The detail of the porting guide is
impressive. The fact that it was originally written by one person is (IMO) a
major plus and that person appears to be VERY active (retired in Cost a Rica?).
With a highest number of 128 there are only 12 open issues in the BitBucket
repo. And this todo list is really interesting. It>>>> -Pete>>>> That sounds a
really compelling reason to me to use it.>>>> PS: I hope everyone is doing well
in NC. I haven't found a group quite>> like ours in Bay Area yet.>>>> -
Huan.>>>> _______________________________________________>> Triangle, NC
Embedded Computing mailing list>>>> To post message: [email protected]>>
List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org>>
TriEmbed web site: http://TriEmbed.org>> To unsubscribe, click link and send a
blank message: mailto:[email protected]?subject=unsubscribe>>>>>
--> Best regards, Mike> _______________________________________________>
Triangle, NC Embedded Computing mailing list>> To post message:
[email protected]> List info:
http://mail.triembed.org/mailman/listinfo/triembed_triembed.org> TriEmbed web
site: http://TriEmbed.org> To unsubscribe, click link and send a blank message:
mailto:[email protected]?subject=unsubscribe>-- Huan Truongwww
tnhh.net / twitter @huant
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