[Tinyos-help] Using I2C Bus for MSP430

[Matteo Andretto]

With pullup resistor I get sendDone event, also if with Fail error but  
I think it is because I have not yet connected a slave device that  
answers with an acknowledge signal.
Thanks a lot to everybody for the help.

Matteo


Joe Polastre wrote:
> SDA has a pullup, SCL does not and requires a pullup for I2C mode.
>
> -Joe
>
> On 12/7/06, R. Steve McKown <rsmckown at yahoo.com> wrote:
>> On Thursday 07 December 2006 08:42 am, Matteo Andretto wrote:
>> > I thought that in TmoteSky pull-up resistor was already connect.
>> > I am too optimistic?
>>
>> I think so.  ;^)  The good folks at MoteIV have the schematic for the TMote
>> Sky in the data sheet, and on a cursory glance I don't see pull-ups.  This
>> actually makes sense, since the I2C and SPI busses share pins, and if not
>> running I2C there's no good reason for pullups on those lines.
>>
>> Steve