From: Scott Wood <scottwood@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] Odd value for I2C_TIMEOUT in fsl_i2c.c
Date: Fri, 04 Sep 2009 14:28:01 -0500 [thread overview]
Message-ID: <4AA16A41.30107@freescale.com> (raw)
In-Reply-To: <20090904192320.34250832E8DE@gemini.denx.de>
Wolfgang Denk wrote:
> Dear Scott Wood,
>
> In message <20090904183437.GA20066@b07421-ec1.am.freescale.net> you wrote:
>>> milliseconds, i. e. a time. "(CONFIG_SYS_HZ / 4)" is a frequency,
>>> i. e. not a time, but the inverse of it.
>>>
>>> It is plain wront to write "250 per second" when you mean "250 milliseconds"
>> It is not a frequency, it is a number of ticks. This is a very common
>> idiom.
>
> CONFIG_SYS_HZ _is_ a frequenzy. It is the number of ticks _per_
> _second_. That is the _inverse_ of a time unit, not a time unit.
Yes, CONFIG_SYS_HZ is a frequency. And when you multiply a _frequency_,
which is _ticks_ per _second_, by a number _seconds_ (in this case, 1/4
sec), you get a number of _ticks_.
-Scott
next prev parent reply other threads:[~2009-09-04 19:28 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-03 15:22 [U-Boot] Odd value for I2C_TIMEOUT in fsl_i2c.c Timur Tabi
2009-09-04 7:16 ` Heiko Schocher
2009-09-04 9:25 ` Wolfgang Denk
2009-09-04 14:09 ` Timur Tabi
2009-09-04 15:01 ` Wolfgang Denk
2009-09-04 15:12 ` Timur Tabi
2009-09-04 15:28 ` Peter Tyser
2009-09-04 15:30 ` Timur Tabi
2009-09-04 16:04 ` Peter Tyser
2009-09-04 18:30 ` Wolfgang Denk
2009-09-04 18:39 ` Timur Tabi
2009-09-04 19:28 ` Wolfgang Denk
2009-09-04 18:28 ` Wolfgang Denk
2009-09-04 15:29 ` Wolfgang Denk
2009-09-04 18:34 ` Scott Wood
2009-09-04 19:23 ` Wolfgang Denk
2009-09-04 19:28 ` Scott Wood [this message]
2009-09-04 8:31 ` Wolfgang Denk
2009-09-04 18:36 ` Scott Wood
2009-09-04 19:27 ` Wolfgang Denk
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