mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-16 22:28:59 +00:00
75 lines
1.1 KiB
ArmAsm
75 lines
1.1 KiB
ArmAsm
;;;
|
|
;;;
|
|
;;; getkey.S
|
|
;;;
|
|
;;; PC-6001 architecture-depend key fetch module
|
|
;;;
|
|
;;; @author Takahide Matsutsuka <markn@markn.org>
|
|
;;;
|
|
|
|
.globl _keyavail_arch
|
|
.globl _getkey_arch
|
|
.area _GSINIT
|
|
|
|
.area _DATA
|
|
;; unsigned char key;
|
|
_key:
|
|
.ds 1
|
|
|
|
.area _GSINIT
|
|
.area _CODE
|
|
|
|
;; ---------------------------------
|
|
;; unsigned char keyavail_arch();
|
|
;; AFBC__HL____
|
|
;; a=getkey, l=getkey
|
|
;; ---------------------------------
|
|
_keyavail_arch:
|
|
ld hl, #_key
|
|
ld a, (hl)
|
|
;; if (key != 0) return 1; else goto _getch;
|
|
or a
|
|
jr z, _getch
|
|
ld l, #0x01
|
|
ret
|
|
|
|
_getch:
|
|
push hl
|
|
;; A = (keybuf)
|
|
call #0x103a
|
|
pop hl
|
|
;; if (keybuf != null) goto _getch_key
|
|
jr nz, _getch_key
|
|
;; we do not have a keyin
|
|
xor a
|
|
jr _getch_got
|
|
_getch_key:
|
|
cp a, #0x14
|
|
jr z, _getch
|
|
|
|
_getch_got:
|
|
;; key = getch()
|
|
ld (hl), a
|
|
ld l, a
|
|
ret
|
|
|
|
|
|
;; ---------------------------------
|
|
;; unsigned char getkey_arch();
|
|
;; AFBC__HL____
|
|
;; ---------------------------------
|
|
_getkey_arch:
|
|
;; if (key == 0) keyavail_arch();
|
|
ld hl, #_key
|
|
ld a, (hl)
|
|
or a
|
|
call z, _keyavail_arch
|
|
;; if (key == 0) goto _havekey
|
|
or a
|
|
jr z, _havekey
|
|
;; key = 0
|
|
ld (hl), #0x00
|
|
_havekey:
|
|
ld l, a
|
|
ret
|