From: Thomas Kastner <thomas.kastner@marekmicro.de>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] ack problem in common/soft_i2c.c?
Date: Fri, 22 Jul 2005 13:38:35 +0200 [thread overview]
Message-ID: <42E0DABB.3030406@marekmicro.de> (raw)
In-Reply-To: <c166aa9f05071116052149024b@mail.gmail.com>
Andrew Dyer wrote:
> I am working with the soft i2c code on my target and I believe
> there is a problem in the send_ack() function.
>
[snip]
> In my case changing the order to:
>
> I2C_SCL(0);
> I2C_DELAY;
> I2C_ACTIVE;
I ported U-Boot to the AT91M55800A (ARM7DTMI) which has multi-driver
capable GPIOs, but didn't want to spend the time to change the I2C code
and left the ACTIVE/TRISTATE mechanism - and also came across the same
problem.
A 24C08 worked fine, but e.g. a ADV7181 would only give me a few
consecutive reads.
So yes, I can confirm there is a problem and also that the above
mentioned fix is OK.
Thomas
--
Thomas Kastner
Dipl.-Ing. (FH)
Entwicklung Hard- und Software
MarekMicro GmbH
Fuggerstr. 9
D-92224 Amberg
Tel: +49 96 21 / 97 32 - 124
Fax: +49 96 21 / 97 32 - 199
eMail: thomas.kastner at marekmicro.de
http://www.marekmicro.de
PGP: http://pgpkeys.pca.dfn.de/pks/lookup?search=0xA197D41B
next prev parent reply other threads:[~2005-07-22 11:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-11 23:05 [U-Boot-Users] ack problem in common/soft_i2c.c? Andrew Dyer
2005-07-12 7:07 ` AW: " Reinhard Meyer
2005-07-22 11:38 ` Thomas Kastner [this message]
2005-07-26 18:42 ` [U-Boot-Users] PATCH was(ack problem in common/soft_i2c.c) Andrew Dyer
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