From: bugzilla-daemon@bugs.ecos.sourceware.org
To: ecos-patches@ecos.sourceware.org
Subject: [Bug 1001397] I2C driver for Kinetis microcontrollers
Date: Wed, 24 Apr 2013 09:08:00 -0000 [thread overview]
Message-ID: <bug-1001397-104-fxDjLgWP0C@http.bugs.ecos.sourceware.org/> (raw)
In-Reply-To: <bug-1001397-104@http.bugs.ecos.sourceware.org/>
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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001397
--- Comment #60 from Ilija Kocho <ilijak@siva.com.mk> ---
Created attachment 2206
--> http://bugs.ecos.sourceware.org/attachment.cgi?id=2206&action=edit
I2C driver print out actual frequency when trace enabled. Increment to
attachment 2188.
Mike
(In reply to comment #59)
> After setting CPU clock to 100Khz:
>
> Freq Mode Meas
> 100Khz Std 98Khz
> 100Khz Agr 111Khz
> 400Khz Std 363Khz
> 400Khz Agr 416Khz
Thank you for the measurements.
>
> From an application point of view, this is a little problematic, in that:
>
> - When you set the goal and value, you don't get feedback in the
> configuration that tells you what the result will be. You have to get a
> scope and measure it.
>
> - If you want to make it more accurate, you have to either guess the correct
> CPU clock, or reverse engineer the algorithm to calculate the required clock
> manually.
>
> One solution might be to have the configuration calculate the proper CPU
> clock so you can then manually change the clock to get a better result.
>
It would be good to have this convenience in CDL but it requires some Tcl
programming, which requires some time...
The second best is to enable some printout at run-time. The attached
incremental patch enables printout of actual I2C clock frequency and period
when trace is enabled.
Note: The printouts that I got are pretty close to what you have measured for
100kHz, but there is a large discrepancy for 400kHz. Can you please and repeat
measurements and check the printouts?
> I am ok with committing the solution as is because I can figure it out for
> 100 and 400 and will have the only answers I need. I think it is just a
> question of how much you want to help the application programmer.
If you are happy with proposed patch and there aren't objections, I would
proceed with commit.
Ilija
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next prev parent reply other threads:[~2013-04-24 9:08 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-1001397-104@http.bugs.ecos.sourceware.org/>
2011-12-01 15:48 ` [Bug 1001397] I2C driver for Kinetic microcontrollers bugzilla-daemon
2011-12-01 15:52 ` bugzilla-daemon
2011-12-01 15:58 ` bugzilla-daemon
2011-12-13 15:13 ` bugzilla-daemon
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2013-04-10 21:16 ` bugzilla-daemon
2013-04-10 21:17 ` [Bug 1001397] I2C driver for Kinetis microcontrollers bugzilla-daemon
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2014-01-28 1:46 ` bugzilla-daemon
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