setting values and percentages

[EarlyBird2]

no its not because of the word var its just the way */ works .

all of this only applies to pbpw only , pbpl is another story

Yes */ can only result in a word the same applies to DIV32 in PBP2.xx as LONGs are not supported.

PBP3 supports LONG variables and */ returns the top 32 bits of a 48 bits internal result, ignoring the lower 16 bits or dividing by 65536 which ever you prefer.

[HenrikOlsson]

Hi,

With PBPW a multiplication results in an internal 32bit result. The */ operator returns the middle 16 bits (inherent division by 256) while the ** operator returns the top 16bits (inherent division by 65536) of this 32bit intermediate result. You need a WORD variable to accommodate the "full" result.

With PBPL a multiplication results in an internal 48bit result. The */ operator returns the middle 32 bits (inherent division by 256) while the ** operator returns the top 32bits (inherent division by 65536) of this 48bit intermediate result. You need a LONG variable to accommodate the full result.

Yes */ can only result in a word the same applies to DIV32 in PBP2.xx as LONGs are not supported.

You don't need PBP3 to use LONGs. Support for that was introduced in PBP2.50, 7 years ago. But you DO need to use an 18F part.

And, finally, DIV32 isn't supported (not needed) with PBPL since it uses a 32bit division routine by default.

All this according to the manual.

EDIT: Both the */ and ** operators supports variables on both sides of the operator while DIV32 requires a constant on the right side. You can't do

Dummy = 1000*1000
Result = DIV32 myVAR   ' Won't work, DIV32 requires division by a constant.

EDIT again, about that DIV32 requiring a constant.....I'm not sure any more. Must try it on actual hardware so you may want to disregard that for the moment :-)

/Henrik.

[HenrikOlsson]

Aargh, not allowed to edit my post....
Regarding the DIV32 - I was wrong, it's more the other way around. Doing Dummy = 1000*1000 won't work because both are constants. At least one of the vaules must be a variable or the compiler will replace the multiplication with a constant resulting in the internal system variables not containing the value for DIV32 to operate on. See here and here for more details.

Sorry for the mixup in my previous reply.

/Henrik.