GTA03 and E-Ink Interface

[Jaya Kumar]

On Sun, Feb 15, 2009 at 12:21 AM, Andy Green <andy at openmoko.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Somebody in the thread at some point said:
>
> | so what I am looking for is 22 pins that I can treat in that way, ie:
> | use as regular GPIO, and are in some way exposed on a connector or a
> | surface trace that can then be wired to an interface board that will
> | carry the display controller itself.
>
> I'm a fan of bitbang personally :-) but the GPIO controllability on
> Glamo would need carefully studying and I can't do it right now due to
> dying laptop battery and leaving flight.  I wouldn't rule it out we
> might be able to do something perfectly in tune with the electrophoretic
> bandwidth / response timescale.
>

Sounds pretty interesting to me! I'm very excited about it and look
forward to your advice.

btw, the bitbang mechanism used to transfer data to the controller
doesn't have a maximum period, meaning, data is clocked in using a
gpio. For example, for the burst write shown previously, I am just
cycling the WRITE signal on/off to clock the data into the controller.
Of course, it would be best if I can clock that data in very fast, so
a gpio that requires more than 50ns to set/clear would still work but
would make the display appear slower than it really was.

Thanks,
jaya