Mike M wrote:
> x=10
>
> 20:
>    BSF  x
>    return
>
> ?????
>
> but see a "10" how will it know what port, what pin in that port, etc.  i cant
 think of a simple way to do this.
> i am very very good at programming so u dont have to explain things to me like
 i know nothing, however this concept puzzles me and my team.  (no were not pro'
s : )

You're the programmer, so you make the decisions as to what the data
stored in EEPROM means. As far as I know there is no standard. It's what
makes most sense to you.

For example

'20' means make a port pin high.

Say there are 2 ports on the target chip.

Upper nibble of next byte = 0 = PortA, if = 1 = PortB.

Lower nibble of this byte = bit number to set. Eg 0 - 7.

So the basic instruction 'High PortA 0' would be tokenised as 20 07

You have already decoded the '20' which jumps to a BSF routine. Your
software knows that it needs one more byte from the next address in
EEPROM to complete the instruction so it fetches it and returns with 07.

A simple way to decode that token is...

Do_High movlw 5h        ; token entry = 20
        movwf fsr       ; preset for porta
        call EEPROM_Read ; get next token
        movwf Temp
        andlw 0xF0      ; if upper nibble = 0 = porta
        btfss status,z
        incf fsr        ; not 0, so = portb
        movf Temp,w     ; get token data again
        call BitMask    ; returns with bit mask for port pin
        iorwf indf      ; set bit
        goto Basic_Loop ; done

BitMask  andlw 7h
         addwf pcl
         retlw b'00000001'
         retlw b'00000010'
         retlw b'00000100'
         retlw b'00001000'
         retlw b'00010000'
         retlw b'00100000'
         retlw b'01000000'
         retlw b'10000000'

I have no doubt there are more compact ways to do this.

--
Best regards

Tony

http://www.picnpoke.com
Email sales@picnpoke.com