fb4c42a357
The log function writes directly to the screen. Combined with the usage of PFS this means that the POSIX layer of the C library isn't referenced anymore thus reducing the memory requirements.
38 lines
878 B
ArmAsm
38 lines
878 B
ArmAsm
; 2002-11-16, Ullrich von Bassewitz
|
|
; 2016-04-28, Greg King
|
|
;
|
|
; void logscr(const void *msg, unsigned len);
|
|
|
|
.export _logscr
|
|
|
|
.import BSOUT
|
|
.import popax
|
|
.importzp ptr1, ptr2
|
|
|
|
;--------------------------------------------------------------------------
|
|
|
|
.proc _logscr
|
|
eor #$FF
|
|
sta ptr2
|
|
txa
|
|
eor #$FF
|
|
sta ptr2+1 ; remember -count-1
|
|
|
|
jsr popax ; get buf
|
|
sta ptr1
|
|
stx ptr1+1
|
|
|
|
L1: inc ptr2 ; count the char that will be printed
|
|
bne L2
|
|
inc ptr2+1
|
|
beq L9
|
|
L2: ldy #$00
|
|
lda (ptr1),y
|
|
jsr BSOUT
|
|
inc ptr1
|
|
bne L1
|
|
inc ptr1+1
|
|
bne L1 ; branch always
|
|
|
|
L9: rts
|
|
.endproc
|