> >>What I found curious in their demo was that
> >>they didnt wait for any flags to signal write completion(!)..

> That's because they didn't care on exit... They check it BEFORE they
> enter the routine.

> > That's probably just fine, *IF* they test the flag
> > *before* writing. Didn't they do that either ?

> Yes, they did.

Do they? I don't see any checking in this code here:

<skip init code>
main

 call ewrite
 nop
 incf EEDATA
 incf EEADR,F
 movf EEADR,W
 xorlw 0x30  ; compare for stop write
 btfsc   STATUS,Z
 goto finis
 movlw 0x00
 goto main
finis
 bcf  STATUS,RP0
 bsf  PORTB,0  ; LED attached to PORTB,0 will light
 goto finis  ; Endless loop - done


ewrite      ; WRITE ROUTINE

 bsf  STATUS,RP0  ; BANK 1
 bsf  EECON1, WREN ; Enable write
 movlw 0x55   ;
 movwf EECON2   ; Write 55 ( required )
 movlw 0xAA
 movwf EECON2   ; Write AA ( required )
 bsf  EECON1,WR  ; Set WR bit
 retlw 0

I don't see it.. Do you?

--
andrew

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