[Gta04-owner] GSM / AT&T Access

Laurent Alebarde l.alebarde at free.fr
Fri Sep 2 08:48:50 CEST 2011

Hi all,
I am new here and thanks all for your efforts.
I would like on my side to use the GTA04 for breadboarding with some
daughter electronics which will have its own batteries ;-) . Is the USB
the only interface ? Is there some open collector output available inside ?
Best regards,

Le 02/09/2011 02:30, David Lanzendörfer a écrit :
>> Would the GTA04 allow developers to have access to the GSM chip, or
>> the API to allow developers to play around with the GSM radio frequency?
> We got the permission to put all AT-Commandos into our docs.
> The interface is UART, so the only thing WE can provide is
> this documentation and the schematic how this UART is wired
> to our CPU.
> BUT if you manage to write an alternative firmware
> like it has been done for the GSM-Chip in the GTA02
> then you can certainly do other things then just hopping between
> the base stations and all the usual phone related stuff.
> I'm not sure I got your question right.
> Maybe you ment Monitoring and Injection?
> Or using is for totally different purposes then GSM?
> Then you will also have the problem of the dimensions of the circuits themself.
>> Also, would the USB OTG host chip be able to provide to full 500mA to power devices with?
> I don't know BUT I wouldn't do that neither.
> Imagine how fast you batteries would be drained this way.
> If you have electronics, which needs this amount of current
> just patch some Pb-Akkumulator into the circuits as well...
>> Thanks.
> You're welcome
>> I cannot wait for this. I'll be using this phone as part of my University project next year :-D.
> Well...
> Next year?
> What project?
> What university?
> best regards
> lev
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