Re: [Fx2lib-devel] Issues with I2C

[Dennis M. <djm...@gm...>]

I guess I never did upload a build to sourceforge.  I do recommend that 
everyone uses 0.2 though.

On 01/05/2011 01:18 PM, Kevin Johnson wrote:
> 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...@pu...>/* wrote:
>
>
>     From: Dennis Muhlestein
>     <djm...@pu...>
>     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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