mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-23 16:29:34 +00:00
35 lines
624 B
ArmAsm
35 lines
624 B
ArmAsm
|
;;;
|
||
|
|
;;;
|
||
|
|
;;; clock.S
|
||
|
|
;;;
|
||
|
|
;;; retrieve tickcount from PC-6001's internal timer
|
||
|
|
;;;
|
||
|
|
;;; @author Takahide Matsutsuka <markn@markn.org>
|
||
|
|
;;;
|
||
|
|
;;; $Id: clock.S,v 1.1 2007/09/11 12:12:59 matsutsuka Exp $
|
||
|
|
;;;
|
||
|
|
.globl _clock_time
|
||
|
|
|
||
|
|
.area _GSINIT
|
||
|
|
;; ---------------------------------
|
||
|
|
;; unsigned long clock_time();
|
||
|
|
;; __BCDEHL____
|
||
|
|
;; return long value as (DE, BC)
|
||
|
|
;; ---------------------------------
|
||
|
|
;; this function uses PC-6001's internal timer
|
||
|
|
;; which counts up 2 per 1/512 sec.
|
||
|
|
.area _CODE
|
||
|
|
_clock_time:
|
||
|
|
ld hl, #0xfa28
|
||
|
|
ld c, (hl)
|
||
|
|
inc hl
|
||
|
|
ld b, (hl)
|
||
|
|
inc hl
|
||
|
|
ld e, (hl)
|
||
|
|
inc hl
|
||
|
|
ld d, (hl)
|
||
|
|
ld l, c
|
||
|
|
ld h, b
|
||
|
|
|
||
|
|
ret
|