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|
;--------------------------------------------------------------------------
; delay1mtcy.S
;
; Copyright (C) 2005, Vangelis Rokas <vrokas at otenet.gr>
;
; This library is free software; you can redistribute it and/or modify it
; under the terms of the GNU General Public License as published by the
; Free Software Foundation; either version 2, or (at your option) any
; later version.
;
; This library is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this library; see the file COPYING. If not, write to the
; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
; MA 02110-1301, USA.
;
; As a special exception, if you link this library with other files,
; some of which are compiled with SDCC, to produce an executable,
; this library does not by itself cause the resulting executable to
; be covered by the GNU General Public License. This exception does
; not however invalidate any other reasons why the executable file
; might be covered by the GNU General Public License.
;--------------------------------------------------------------------------
include <p18fxxx.inc>
extern _delay10tcy
extern _delay100tcy
extern _delay10ktcy
global _delay1mtcy
code
_delay1mtcy:
; polynomial for 1mtcy delay is f(x) = 100000 * (x-1) + 100000
decf WREG, f
movwf POSTDEC1
movlw 99
call _delay10ktcy
movlw 99
call _delay100tcy
movlw 9
call _delay10tcy
movf PREINC1, w
bz @delay1m_end
bra $+2
@delay1m_loop:
movwf POSTDEC1
movlw 99
call _delay10ktcy
movlw 99
call _delay100tcy
movlw 9
call _delay10tcy
bra $+2
bra $+2
nop
movf PREINC1, w
decfsz WREG, f
bra @delay1m_loop
@delay1m_end:
return
end
|
