Re: [Fx2lib-devel] Issues with I2C

[Kevin J. <kjp...@ya...>]

Thanks.  I was looking for a confirmation there were  alot of improvements to the I2C before going through the process of figuring out how to access git.  I am sure it isn't hard I just had never done it before and was trying to avoid getting side tracked if it didn't make sense.

Kevin


--- On Wed, 1/5/11, Dennis Muhlestein <djm...@gm...> wrote:

From: Dennis Muhlestein <djm...@gm...>
Subject: Re: [Fx2lib-devel] Issues with I2C
To: fx2...@li...
Date: Wednesday, January 5, 2011, 5:51 PM

Try the latest sources from git.  Github has an 0.2 build if I recall. 
Or at least an 0.2 download.  I think there were a lot of i2c fixes 
between 0.1 and 0.2.

-Dennis

On 01/05/2011 10:10 AM, Kevin Johnson wrote:
> I am using a Cypress 68013 and a 16 kB 3.3 V EEPROM. The fx2lib I2C
> functions to read the EEPROM isn't working, but if I manually send the
> I2C read and write functions as shown in the read and write EEPROM code,
> but with a delay in between it works fine.
>
> Has anyone else seen this? I am only running at 100kHz.
>
> I am using fx2lib-src-0.1.tgz which looks like the only released
> version. I am using the newest version of SDCC so I had to go through
> and update everything. Didn't know about the github until already had
> done it.
>
> I am just interested if there were any other fixes to I2C that I might
> not have roled in or if I should just add a SYNCDELAY in my fx2lib and
> rebuild it.
>
> When I check with a scope, what I notice is that without the delay the
> first 1 to 3 reads are NACKed. It retries and eventually gets a ACK when
> the part is ready but the randomness of when it gets acked means that
> the data is random. If I add the delay the first read is ALWAYS acked
> and the data is always good.
>
> Thanks
>
> Kevin
>
>
>
>
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