> Is there anything I need to change

BTW, I just noticed that 'shadowd' is in the code, but 'bshad'
is in the comments. 'bshad' is obviously a left-over from a
version that used PortB. The data splitting is to send two 4-bit
nybbles out of LATD <0:3>, whilst preserving the state of <4:7>.
If you're using the upper half of the port, "invert" that

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