FillMem or ClearMem

[Darrel Taylor]

For PBP 2.60 ...

MyArraySize   CON 32                    ; SizeOf
MyArray       VAR BYTE[MyArraySize]     ; The Array

ARRAYWRITE  MyArray,[REP 0\MyArraySize] ; Clear Array

[BigWumpus]

I've done some own work, but it is not tested:

    asm
ClearMem macro Array,Size                           ;Macro um Speicher zu löschen
    lfsr 0,Array
    movlw Size
    clrf POSTINC0
    decfsz WREG
    bra $-2
    endm
    endasm

Any hints ?

[BigWumpus]

For PBP 2.60 ...

ARRAYWRITE  MyArray,[REP 0\MyArraySize] ; Clear Array

Does this build a loop, or is there a "heavy load" of data in the code ?
I work with PBP 2.50C.

[mackrackit]

You need PBP 2.60 to use ARRAYWRITE.

[Darrel Taylor]

Does this build a loop, or is there a "heavy load" of data in the code ?

Yes, it will use a loop (with 2.60).

And in your macro above ...
Since it uses the LFSR instruction, it will only work on 18F's.
And 18F's are addressed by bytes instead of words, so I think the bra $-2 would need to be bra $-4.
Otherwise, it should work.

[BigWumpus]

And in your macro above ...
Since it uses the LFSR instruction, it will only work on 18F's.

Yes - that is know, the tiny 16Fs doesn't have so big tasks to do ... ;-)

And 18F's are addressed by bytes instead of words, so I think the bra $-2 would need to be bra $-4.
Otherwise, it should work.

No - the datasheet uses a bra $-2 too and Picbasic compiles:

000C12 0003               M loop    sleep
000C14 D7FE               M         bra     loop

the same way as

                      03868  ClearMem _bTier,_lTier                    ;Tier-Buffer löschen
000F46 EE01 F042          M     lfsr 0,_bTier
000F4A 0E20               M     movlw _lTier
000F4C 6AEE               M     clrf POSTINC0
000F4E 2EE8               M     decfsz WREG
000F50 D7FE               M     bra $-2

So, I think it will work for me...

[Darrel Taylor]

No - the datasheet uses a bra $-2 too and Picbasic compiles:

000C12 0003               M loop    sleep
000C14 D7FE               M         bra     loop

the same way as

                      03868  ClearMem _bTier,_lTier                    ;Tier-Buffer löschen
000F46 EE01 F042          M     lfsr 0,_bTier
000F4A 0E20               M     movlw _lTier
000F4C 6AEE               M     clrf POSTINC0
000F4E 2EE8               M     decfsz WREG
000F50 D7FE               M     bra $-2

So, I think it will work for me...

In the "sleep" example, the branch is going to the instruction immediately before the bra.

In your macro, the bra needs to jump 2 instructions up to the clrf POSTINC0.
So it will need to be -4.

[BigWumpus]

S*it

to late - to much wine