Re: [Gumstix-users] I2C Problem

[Adam S. <asa...@at...>]

Figured it out..... sure enough it was the wrong address.  I2C only
takes the most significant 7 bits.

Dave Hylands wrote:
> Hi Adam,
>
> On Dec 11, 2007 7:52 AM, Adam Salamon <asa...@at...> wrote:
>   
>> Yep.  I used a 10k on both lines (as per my device datasheet).  They are
>> on the external board that I'm connecting to.
>>     
>
> The other common problem is using the incorrect address.
>
> The i2c address is the upper 7-bits in the address byte. Many data
> sheets present the address byte and not the address itself. The actual
> address is normally the address byte divided by 2.
>
> So from linux's perspective the address is a number from 0-127 (0x00 to 0x7F)
>
> Which device are you connecting to?
>
>   

-- 
Adam Salamon
Member, Engineering Staff
Lockheed Martin Advanced Technology Lab
asa...@at... | (856) 792-9718