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Mon May 21 11:05:55 EDT 2018

I need a PRU emulator

Will need to write some "threaded" PRU code, but I want to make sure I
have a little framework where I can evaluate the code before actually
running it on the machine.  Debugging is minimal.

This coincides with some staapl idea to do the same for the PIC.

I need some general approach.  Implement it as a monad, but the monad
should be programmable.

I have two main tricks:

- "tagless final"
- free monads to separate code and data structure

EDIT: The meaning of a program is a function that produces an infinite
timing diagram.  So the meaning of an instruction is to modify the
value of a signal at a particular time.  The program counter is just
another signal.

Now, specify the assembly language as a class that is parameterized by
a monad that satisfies certain constraints.



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