Assembly Language inside PBP

[Bill Legge]

Thanks Jerson - I will give it a go.

I presume that PBP allocates two BYTES of memory to the WORD sized variable 'RAIN' and the assembler routine only deals with one of them?

I guess I could create two BYTES to hold the RAIN data and increment the 'higher' BYTE if there is a carry from the 'lower' - Seems a bit cumbersome and I was looking for a neater/easier way.

Regards Bill Legge

[Acetronics2]

Seems a bit cumbersome and I was looking for a neater/easier way.

Hi, Bill

As the 18F1220 is a 8 bits processor ... the neater/easier way is to use a 16 bits device !!!

not obvious easier, eh ???

NOW, The "DT Instant interrupts" might do the trick " neater " ( sic ) ... it's not raining as the "Niagara falls" , after all ...

OR use one of the chip 16 Bits counters ... you have 3 aboard, after alll ...

Alain

[Darrel Taylor]

I guess I could create two BYTES to hold the RAIN data and increment the 'higher' BYTE if there is a carry from the 'lower' - Seems a bit cumbersome and I was looking for a neater/easier way.

Simple addition or incrementing variables doesn't use the system registers.
So it's ok to break out of ASM and do it with PBP.

Rain   VAR WORD

ASM
MyInt
    ;save context
    ;asm part here
    ENDASM
      Rain = Rain + 1
    ASM
    ;more asm here
    ;restore context
    retfie
ENDASM