Custom calypso board

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Harald Welte laforge at
Wed Jul 11 07:41:04 UTC 2012

Hi Cristian Paul,

On Tue, Jul 10, 2012 at 08:57:43PM -0500, Cristian Paul Peñaranda Rojas wrote:
> > Schematics will be published in PDF form only, Gerber/PCB files will not
> > be released (so basically the same like the OsmoSDR situation).
> Is it due some restricted format from layout software or third party
> contract clause?

Actually, both is true and there's little flexibility on that side :/

> As you mentioned there will not be LCM/Keypad or similar, useful for
> a theoretically Open Hardware Phone, so by limiting access to
> layout/gerber stops a bit the chance one some day can free it and make a
> derivate work.

Well, I'd say there will be plenty of connectors.  The LCD (even on the
compal/motorola phones) is just attached to I2C (plus the backlight
pwm).  And the keypad is just the matrix.

We _may_ actually be able to put the circular "button" footprint for
something like the C123 keypad on the back side of the PCB, as so far
this is "only" a ground plane.  Depends a bit on the effort, and
where/how somebody could source those thin membrane keyboards.

- Harald Welte <laforge at> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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