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, Xmain_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

[remi2]

Posted on September 29, 2014 at 20:22

🙂

my function works this way; try write H CHKBZF mov PD_ODR, #0b01000011 STRBLCD CHKBZF mov PD_ODR, #0b10000011 STRBLCD;try write X mov _lcdchar, #'X' ;                             <----- loads an immediate '' capital x '' call _lcdwritechar  ;                             <----- works: i get X on the lcd mov _varOne, #'a' ld a,#_string_0 ld _charptr, aso my fonction works with immediate valuesthats why i try to pop up literals from a string.Regards

[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, xmain_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_loop1$: ret

string_0:

        .ascii ''toto\0''

[remi2]

Posted on September 30, 2014 at 11:11thank you ! it works 🙂regards