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;--------------------------------------------------------------------------
; fps16x162schar.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 ___fps16x162schar
;--------------------------------------------------------
; 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
PLUSW1 equ 0xfe3
PRODL equ 0xff3
PRODH equ 0xff4
S_fps16x162schar____fps16x162schar code
___fps16x162schar:
movlw 0x04
movff PLUSW1, PRODL
movlw 0x03
movf PLUSW1, w
btfss PRODL, 7
bra @1
negf WREG
@1:
return
end
|
