GTA03 and E-Ink Interface

Joerg Reisenweber joerg at
Sat Feb 14 20:18:22 CET 2009

Am Sa  14. Februar 2009 schrieb Jaya Kumar:
> ni hao and hello OpenMoko friends,
> Ok, to explain my interest quickly: what I hope to do is to take an
> openmoko and add an E-Ink display, possibly replacing the LCD if
> necessary. It is too early for this to be useful to people so I do not
> want to consume any significant time or effort from OpenMoko's
> developers. I'm willing to do this on my own.
> I'm the author of the E-Ink display controller drivers in the mainline
> linux kernel, and have been working on making broadsheetfb, the driver
> for E-Ink's latest controller behave in a way such that generic Linux
> applications can run on it without any modification. I have had some
> good initial results which I have shown. eg: videos here ( mozilla
> fennec on e-ink, ) and
> various articles here (
> ).
> I feel I have a clear idea of how to achieve this idea of adding an
> E-Ink panel to a phone, the only constraint is that I need 22-pins of
> GPIO. I asked Harald and he had suggestions and pointed out that the
> 22-pin constraint may be a serious problem. I'm willing to sacrifice
> certain other peripherals to get that count. I was searching the
> openmoko wiki for GTA03 gpio pinout or some idea of a list of signals
> that are brought to surface pads or traces that I could then tap onto.
> Is this available?
> I had also looked at GTA02 pins:
> based on that, some notes for myself:
> - abandon bluetooth 1
> - abandon sd card 6
> - abandon LCD and repurpose those LCD's interface pins that can be
> repurposed as gpio, i think this gives me about 5 pins but not sure if
> all are brought to connector (lcdvf0,1,2, lcdhclk, lcdpwren),
> - so insufficient gpio. have to use gpio extender connected via i2c or
> uart. a big latency penalty though.
> - so look at gta03 and hope for inspiration :-)
> Any advice and suggestions would be greatly welcome.

You need those 22 gpio *in addition* to the LCM data lines from glamo to lcm?

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