pointer problem (sdcc assembler)

[remi2]

Posted on September 26, 2014 at 16:37

Hello

With the code below, i get returned an incremented caracter it self , the pointer is not,

is it normal ? meaning my code is wrong . i mean i get U not O ...

Or should I file a bug at sdcc comunity?

ldw X,&sharpstring_0

ldw _charptr, X

main_loop:

LDW X, &sharp0d50

CALL delay_m

CALL ledon

LDW X, &sharp0d50

CALL delay_m

CALL ledoff

ldw Y,[_charptr]                 ; <---- not returning what is at that address

ldw _lcdchar, Y

call _lcdwritechar

ldw Y, _charptr

incw Y

ldw _charptr, Y

JP main_loop

.area CODE

string_0:

        .ascii ''toto''

        .db 0x00

#stm8-sdcc-linux-sdasm-sdasstm8

[zzdz2]

Posted on September 30, 2014 at 10:50

I think something like this would work:

.area  DATA

_lcdchar:

.ds 1

_charptr:

.ds 2

.area HOME

ldw x,#string_0 ; init pointer

ldw _charptr, x

main_loop:

        ldw x, _charptr ; load pointer

        ld a, (x) ; load char

tnz a ; test if zero

jreq 1$

ld _lcdchar, a

call _lcdwritechar

ldw x, _charptr ; increment pointer

incw x

ldw _charptr, x

jra main_loop

1$:

ret

string_0:

        .ascii ''toto\0''

[remi2]

Posted on September 30, 2014 at 11:11

thank you ! it works :)

regards