[gta02-core] Calypso's last dance

Werner Almesberger werner at openmoko.org
Thu Jul 23 18:17:06 CEST 2009

Stefan Schmidt wrote:
> What is you plan for wake up from call and other signaling from modem to cpu?
> Some additional GPIO line?

I hope they have a mechanism like this, yes. Having to use USB
Interrupt transfers wouldn't be so nice :-)

But to know this kind of details, we'll need proper documentation.

> Such a setup, USB + GPIO lines for handshake and signaling, was used on the
> Motorola EZX phones. I remember pain in this area. USB is just not designed
> for an intelligent slave that have to teach the master. :)

Life would be so boring without a race condition from time to
time ;-)

- Werner

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