From: Wolfram Sang <wsa@sang-engineering.com>
To: "Matwey V. Kornilov" <matwey.kornilov@gmail.com>
Cc: linux-i2c@vger.kernel.org
Subject: Re: i2c-slave-testunit over i2c-gpio bus
Date: Tue, 18 Feb 2025 11:02:37 +0100 [thread overview]
Message-ID: <Z7RavX4Ro26AZJir@ninjato> (raw)
In-Reply-To: <CAJs94EaBRDkx5grA2yC=e_Zgut4RK0ZGQnUS2Vc0fABTC9UJSw@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 479 bytes --]
> Thanks. But isn't it possible to attach an interrupt handler to SCL
> GPIO? Or do you mean that the latency for IRQ handling is too high?
Way too high for most systems. I made the in-kernel sloppy GPIO logic
analyzer. From that experience, even with constant polling using an
isolated CPU core, you would need at least a dedicatded 300MHz core to
monitor 100kHz. With interrupts, it will probably be a magnitutde more.
I scrapped that idea for the above analyzer, too slow.
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
next prev parent reply other threads:[~2025-02-18 10:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-18 8:49 i2c-slave-testunit over i2c-gpio bus Matwey V. Kornilov
2025-02-18 9:44 ` Wolfram Sang
2025-02-18 9:46 ` Matwey V. Kornilov
2025-02-18 10:02 ` Wolfram Sang [this message]
2025-02-18 10:21 ` Matwey V. Kornilov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Z7RavX4Ro26AZJir@ninjato \
--to=wsa@sang-engineering.com \
--cc=linux-i2c@vger.kernel.org \
--cc=matwey.kornilov@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.