Re: [Gumstix-users] hardware issue: FFUART pin

[Rajagopalan P. <raj...@gm...>]

thanx a lot.

On 10/30/06, Alexandre Pereira Nunes <al...@om...> wrote:
>
> Rajagopalan Parthasarathy escreveu:
>
> > hi
> >
> > thanx a lot for the info. The GSM module(MC75) is class B(GPRS). So
> > does it mean that i have to implement the pin Ring0 using some other
> > pin(GPIO, as dave said) in software(in the driver)??
>
>
> As far as I know, only if you need to be able to get incoming call info
> while connected to gprs/csd.  I've developed quite a few solutions in
> gsm world, with class b modems, inclusive, without needing this
> functionality at all. But there are indeed some scenarios where you
> can't avoid that. It depends on what you're planning to do. For the
> basics all you'll ever need is tx, rx and ground.
>
> If I were to do it, I would just poll a regular GPIO in software and
> take actions from there. It's the easy way to go. You don't need
> performance or have latency issues (disconnecting the modem for
> answering the call takes quite a long time anyway) on this case, so you
> can just use /proc/gpio as described on the wiki.
>
> >
> > Also can you give pointers to sites that have general info on GSM
> > modules/modems?
>
>
> All I ever used was the documentation provided by the modems. At least
> the motorola series has public documents, but for the siemens I had to
> sign a  NDA (and I only got docs for some models), so I can't point you
> to these (you probably already have them anyway).
>
> The thing is that altough there are GSM standards, and lots of tutorials
> on doing things like sending/receiving SMS that are useful for almost
> all brands of GSM phones/modems, there are other things such as GPRS
> connection setting/stablishing that most companies prefer to do the hard
> way (by not following the standards and doing it using a proprietary
> syntax; But even when they go the other way, there are both newer and
> outdated [incompatible] standards, some go one way, some go the other,
> and the rest do it proprietarly. So much for standards).
>
> In other words, you generally gain by going straight to the source (the
> manufacturer's documents) rather than trying to adapt a tutorial based
> on something else to work with a specific brand. Also, it's not uncommon
> for modems series from the same manufacturer to be incompatible with
> each other.
>
> Good luck,
>
> Alexandre.
>
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