From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Kastner Date: Fri, 22 Jul 2005 13:38:35 +0200 Subject: [U-Boot-Users] ack problem in common/soft_i2c.c? In-Reply-To: References: Message-ID: <42E0DABB.3030406@marekmicro.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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