From: Daniel Mack <daniel-rDUAYElUppE@public.gmane.org>
To: 伊泽 <wxc200-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Ayman KHAMOUMA <ayman.khamouma-qxv4g6HH51o@public.gmane.org>,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
pramod gurav
<pramodforum-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
Subject: Re: Need help on selecting one (and only one) i2c bus
Date: Wed, 11 Mar 2009 10:47:52 +0100 [thread overview]
Message-ID: <20090311094752.GE25824@buzzloop.caiaq.de> (raw)
In-Reply-To: <20090311101513.271f5464-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
On Wed, 11 Mar 2009 14:27:33 +0800, 伊泽 wrote:
> > As you said,i2c address 0x00 is not allowed for common i2c slave device,it
> > is reserved as broadcast address.Unfortunately,our project has a sensor
> > cy8c201a0 on i2c-bus,it use 0x00 address.
Not true. You need to provide a firmware for that device and this
firmware selects the I2C slave address. Read the datasheet again.
(page 5):
"The I2C address is programmable during configuration. It can be locked
to prevent accidental change by setting a flag in a config-uration
register."
> > We met much phone hang problem with i2c,errors such as "waiting for bus
> > free" or "exhausted retries" are all with this sensor.
Same reason. Without a firmware, the chips does not have its I2C core
set up and hence it's blocking SDA and/or SCL.
Daniel
next prev parent reply other threads:[~2009-03-11 9:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-09 14:52 Need help on selecting one (and only one) i2c bus Ayman KHAMOUMA
[not found] ` <000001c9a0c6$bf92af80$b23e81a4-J7BnVcvkGbbQT0dZR+AlfA@public.gmane.org>
2009-03-10 15:30 ` Jean Delvare
[not found] ` <20090310163044.571e4aff-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-03-10 15:58 ` Ayman KHAMOUMA
2009-03-10 16:03 ` Ayman KHAMOUMA
2009-03-11 10:55 ` Ayman KHAMOUMA
[not found] ` <000301c9a237$e6d3c8f0$b23e81a4-J7BnVcvkGbbQT0dZR+AlfA@public.gmane.org>
2009-03-11 11:22 ` Jean Delvare
[not found] ` <20090311122257.7c7805f0-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-03-11 11:44 ` Ayman KHAMOUMA
2009-03-11 16:51 ` Ayman KHAMOUMA
[not found] ` <001301c9a269$ab95d940$b23e81a4-J7BnVcvkGbbQT0dZR+AlfA@public.gmane.org>
2009-03-11 19:09 ` Jean Delvare
2009-03-24 10:27 ` I2c message at init time Ayman KHAMOUMA
[not found] ` <000201c9ac6b$34a95300$2d3f81a4-J7BnVcvkGbbQT0dZR+AlfA@public.gmane.org>
2009-03-24 15:52 ` Jean Delvare
[not found] ` <20090324165227.0d97454c-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-03-24 15:58 ` Ayman KHAMOUMA
[not found] ` <fd6b62c10903102327u426a4262meeabe2c581d7107b@mail.gmail.com>
[not found] ` <fd6b62c10903102327u426a4262meeabe2c581d7107b-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-03-11 9:15 ` Need help on selecting one (and only one) i2c bus Jean Delvare
[not found] ` <20090311101513.271f5464-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-03-11 9:47 ` Daniel Mack [this message]
[not found] ` <fd6b62c10903110319w1eebd2ebs4b83e7d1247f1678@mail.gmail.com>
[not found] ` <fd6b62c10903110319w1eebd2ebs4b83e7d1247f1678-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-03-11 10:40 ` Daniel Mack
-- strict thread matches above, loose matches on Subject: below --
2009-03-09 10:58 Ayman KHAMOUMA
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