#7 active multiplexor driver for 0.2.5

[Mark Falco]

This patch allows you to use the active multiplexor
sold by www.mindsensors.com with legOS. This active
multiplexor allows you to connect three lego compatible
sensors to a single RCX sensor port.

Installation:

This patch applies against legOS 0.2.5
> cd legOS
> patch -Np1 < mux.patch
> gmake realclean
> gmake

then just download the new firmware

view legOS/multiplexor.txt for usage details

[Mark Falco]

[Mark Falco]

v1 of mux patch

[Mark Falco]

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Modified mux driver to fix the problem with mux hardware
periodically intrepreting read pulse as change pulse. Now
the read pulse is used as the first change pulse for the
next switch. This fixes a bug in the last ver, where when
you used a rotation sensor (on another RCX port) it would
cause the mux driver to get out of sync with the mux
hardware.