Hi, not really sure what is wrong with it,
but as it intermittent, my guess is probably context
saving during IRQ ? positive thats ok ? and that the
var offset is not touched inside irq also ?

Further a snippet that might help :)
( would perform the same function )

;
***********************************************************************
;
;  TX_ADD_HEX - Add two bytes of ASCII decimal (0-9, A-F) in out buffer
from nibbles =

;  in W-reg
;  NOTE uses TWO deep stack ( nested calls ) !! =

;
TX_ADD_HEX
        MOVWF   Temp    ; save byte temporarily
        SWAPF   Temp,W  =

        CALL    TX_ADD_NIBBLE   ; first one
        MOVF    Temp,W  ; get back temp
        ; and add second one
TX_ADD_NIBBLE
        ANDLW   0x0F    ; mask out top nibble, preserv low nibble
        ADDLW   0xF6    ; add 246, to check if 0-9 or a-f, w=3Dnibble+246
        BTFSC   STATUS,C ; if carry set then a-f
        ADDLW   0x07     ; carry set, then add 7, w=3Dnibble+246+7 ( note
nibble known to be a-f )
        ADDLW   0x3A     ; then finally add 58 to get 'proper' ascii =

                        ; 1) w =3D low(nibble+246+58) =3D 48+nibble ( if 0-9
)
                        ; 2) w =3D low(nibble+246+7+58) =3D 55+nibble ( if
a-f )

        CALL    TX_ADD_BUFFER   ; add it to tx buffer

        RETURN


/Tony





Tony K=FCbek, Flintab AB            =

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