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;--------------------------------------------------------------------------
; fps16x162slong.S - convert fixed16x16 to signed char
;
; Copyright (C) 2004, 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.
;--------------------------------------------------------------------------
radix dec
;--------------------------------------------------------
; public variables in this module
;--------------------------------------------------------
global ___fps16x162slong
;--------------------------------------------------------
; Equates to used internal registers
;--------------------------------------------------------
STATUS equ 0xfd8
WREG equ 0xfe8
FSR0L equ 0xfe9
FSR1L equ 0xfe1
FSR2L equ 0xfd9
POSTDEC1 equ 0xfe5
PREINC1 equ 0xfe4
PLUSW2 equ 0xfdb
PLUSW1 equ 0xfe3
PRODL equ 0xff3
PRODH equ 0xff4
; Internal registers
.registers udata_ovr 0x0000
r0x00 res 1
r0x01 res 1
r0x02 res 1
r0x03 res 1
S_fps16x162slong____fps16x162slong code
___fps16x162slong:
movlw 0x04
movff PLUSW1, PRODL
movlw 0x03
movf PLUSW1, w
clrf PRODH
clrf FSR0L
btfss PRODL, 7
bra @1
bcf PRODL, 7
comf WREG, f
comf PRODL, f
comf PRODH, f
comf FSR0L, f
incfsz WREG, f
bra @1
incfsz PRODL, f
bra @1
incfsz PRODH, f
bra @1
incf FSR0L, f
@1:
return
end
|
