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/*-------------------------------------------------------------------------
gptrget2.c - get 2 byte value from generic pointer
Copyright (C) 1999, Sandeep Dutta . sandeep.dutta@usa.net
Adopted for pic16 port by Vangelis Rokas, 2004 <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.
-------------------------------------------------------------------------*/
/* the return value is expected to be in (FSR0H, PRODH, PRODL, WREG),
* therefore we choose return type void here. Generic pointer is expected
* to be in (WREG, PRODL, FSR0L), so function arguments are void, too */
extern int POSTINC0;
extern int INDF0;
extern int FSR0L;
extern int FSR0H;
extern int WREG;
extern int TBLPTRL;
extern int TBLPTRH;
extern int TBLPTRU;
extern int TABLAT;
extern int PRODL;
extern int __eeprom_gptrget2;
void _gptrget2(void) __naked
{
__asm
/* decode generic pointer MSB (in WREG) bits 6 and 7:
* 00 -> code
* 01 -> EEPROM
* 10 -> data
* 11 -> data
*
* address in (WREG, PRODL, FSR0L)
* result in (FSR0L, PRODH, PRODL, WREG)
*/
btfss _WREG, 7, 0
bra _lab_01_
/* data pointer */
/* FSR0L is already set up */
movff _PRODL, _FSR0H
movf _POSTINC0, 0, 0
movff _POSTINC0, _PRODL
return
_lab_01_:
/* code or eeprom */
btfsc _WREG, 6, 0
goto ___eeprom_gptrget2
; code pointer
movff _FSR0L, _TBLPTRL
movff _PRODL, _TBLPTRH
movwf _TBLPTRU, 0
/* fetch first byte */
TBLRD*+
movf _TABLAT, 0, 0
/* fetch second byte */
TBLRD*+
movff _TABLAT, _PRODL
return
__endasm;
}
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