Access Bytes of Long Array

JCee

I am trying declare bytes of long arrays and I cant get it to work

Var
·Long Point[noparse][[/noparse]10]

·Point[noparse][[/noparse]0].byte[noparse][[/noparse]0]:= 10
·Point[noparse][[/noparse]0].byte[noparse][[/noparse]1]:= 20
·Point[noparse][[/noparse]0].byte[noparse][[/noparse]2]:= 30

·Point[noparse][[/noparse]1].byte[noparse][[/noparse]0]:= 10
·Point[noparse][[/noparse]1].byte[noparse][[/noparse]1]:= 20
·Point[noparse][[/noparse]1].byte[noparse][[/noparse]2]:= 30

I would like to be able to loop thru an array of points and set values of specific bytes.

Do·I have a syntax problem or is there a better way to do it. ·

Phil Pilgrim (PhiPi)

What you're doing should work. What behavior do you observe that's unexpected?

-Phil

Mike Green

The problem is that you can't use subscripts on both parts of the variable descriptor. You can't say "Point[noparse][[/noparse]x].byte[noparse][[/noparse]y]". What you can do is "Point.byte[noparse][[/noparse]x*4+y]".

Phil Pilgrim (PhiPi)

My bad! Mike is right. I was so lulled by the innate naturalness of Point[noparse][[/noparse]*1].byte[noparse][[/noparse]*2] := 30 (odd that it's not allowed) that I didn't question it. You can also do:

[b]byte[/b][noparse][[/noparse]*@Point[noparse][[/noparse]*1]][noparse][[/noparse]*2] := 30

if you don't want to do the address calculation explicitly.

-Phil

JCee

Thanks
the loops run as expected

Clock Loop

If you use DAT, you can just do this...

DAT


 
 Point0      BYTE     10, 20, 30

 Point1      BYTE     10, 20, 30

Propeller manual page 99.