constant arithmetic (and, or) in inline assembler

pik33

While in Spin I can do

            wrpin     ##(P_ASYNC_TX | P_OE), #pi_tx_2 

This generates an error in FlexBasic. FlexBasic uses "or" instead of "|", so I tried this:

            wrpin     ##(P_ASYNC_TX or P_OE), #pi_tx_2 

which also gives the compilation error:

error: syntax error, unexpected asm instruction, expecting ')'

The workaround was to define the global constant

const asm_tx=P_ASYNC_TX or P_OE

and use this in the asm.

Is there any better way do do constants arithmetic in FlexBasic's inline assembler?

Ariba

I always use + instead of | As long as there are no overlapping bits in the constants, this is the same.

            wrpin     ##(P_ASYNC_TX + P_OE), #pi_tx_2

And FlexBasic is also happy with it.

Andy

ersmith

Yeah, this one is an unfortunate case where Spin's syntax for inline assembly and BASIC's conflict. I'm unsure of the best solution. Probably adding | and & as operators to BASIC might make sense, although there would still be a problem with xor (^), which already has a meaning in BASIC as exponentiation.

pik33

Maybe the solution is to recognize |, & and ^ as or, and, xor only in asm blocks. Exponentiation is much less needed (did someone used it already?) in asm blocks than xor