How to do this in ASM?

[Darrel Taylor]

>> can i do rrf _my_data,1 and expect the whole word to be rotated?

No, it only works with 1 byte at a time. But, the rrf rotates through the CARRY flag, so a second rrf on the next byte will rotate the CARRY right into the next byte.

>> I dont get is how to get the base memory address of the array

At the ASM level, that's what variables are, pointers(address) to the actual memory location in RAM. So low _array gives you the lowbyte of the address of the variable array.
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[Darrel Taylor]

Kamikaze,

Ok, let's try this one more time. I think this is what you're after. And, since you're using it in an interrupt, it save/restores the FSR so it doesn't interfere with normal PBP operations.

fsave var byte
ASM
    movf    FSR, W       ; save current FSR value
    movwf   _fsave
    movlw   low _array   ; load FSR with address of the array
    movwf   FSR
    movf    _index,W     ; get index value
    addwf   FSR, F       ; add index to FSR
    movf    _my_data, W  ; get my_data.Byte0
    movwf   INDF         ; put it in the array
    movf    _fsave, W    ; restore the original FSR
    movwf   FSR
ENDASM

[Kamikaze47]

Thanks for that Darrel... Looks like it will do what I want