🚀 go-pugleaf

I've had fairly good success with using the OCx pins on the EVB (for
infrared remote faking), but on my current project I'd like to save
them for other functions and use the real time interrupt (RTI) to
periodically call a subroutine.

So far, no luck.  I set the vector up (finish the jmp instruction in
the pseudo vector table of the EVBU ROM), set the MSK and FLGS values,
and clear interrupts, but my routine doesn't seem to get called.

Help! 

BTW, the project I'm working on is a soil moisture sensor that uses
the reflectance of three wavelengths of light.  I'm pulsing the three
lasers and reading the value of the photodiode into three locations.
I'd like to do this (and someday the moisture calculation) in the
background, while the user interface is running in the foreground.

Thanks!

--kyler