> [a shim is] A library that provides an API that uses some of the API of t=
he other library, but implements some features differently.

In this case, we=92re talking about the =93arduino core=94 libraries - func=
tions like digitalWrite() and pinMode()
Once you implement the =93core=94 (which is relatively easy on most archite=
ctures), then many of the more complex libraries that USE that core will ju=
st work.

Unfortunately, not all of the user libraries USE the core; many libraries e=
xist mainly for the purpose of accessing AVR-specific features (timers, I2C=
, SPI) that are NOT implemented by the core, and those can wind up being ve=
ry chip-specific.  Various Arduino derivatives have started off fine, only =
to annoy users when the more complex libraries aren=92t as compatible as th=
ey=92d like.

I was thinking the other day that the Arduino core is probably the closest =
thing that exists to a multi-architecture API standard for microcontroller-=
like features.  Individual vendors tend to implement things that are more v=
endor-specific than they should be :-(  This is sort of sad.

BillW


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