Re: [Gumstix-users] verdex + breakout-vx i2c pullup

[thaGod <th...@gm...>]

Yeah.. that's i2c 101 =) 

I had both lines pulled up and still got bus waiting for free messages.. but
only when the tsc2003 driver was loaded at the same time as the i2c-pxa
module. It didn't matter which order they were loaded in.. either order gave
me the same errors when the 2nd module was added.

Erick


Dave Hylands wrote:
> 
> Hi Erick,
> 
>> I'd like to give your i2c test programs some more trials on my verdex
>> someday
>> Dave. I know I've got something else configured wrong because even with
>> all
>> my lines pulled up (and verified pulled up on the scope) I was unable to
>> get
>> anything to work right as far as I could tell.
>>
>> My main test case was the tsc2003 driver and whenever I loaded both the
>> tsc2003 and i2c-pxa modules I got a waiting for bus to free error
>> message.
>> Someday I'd like to get to the bottom of it.
> 
> Waiting for bus free means that the SCL signal (and/or SDA - I don't
> remember exactly) is being held low.
> 
> When the bus is idle, then both SDA and SCL should be sitting at 3.3v
> 
> -- 
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
> 
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