1 /*-------------------------------------------------------------------------
3 gptrget4.c :- get 4 byte value from generic pointer
5 Adopted for pic16 port by Vangelis Rokas, 2004 (vrokas@otenet.gr)
7 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1999)
9 This library is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Library General Public License as published by the
11 Free Software Foundation; either version 2, or (at your option) any
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU Library General Public License for more details.
19 You should have received a copy of the GNU Library General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 In other words, you are welcome to use, share and improve this program.
24 You are forbidden to forbid anyone else to use, share and improve
25 what you give them. Help stamp out software-hoarding!
26 -------------------------------------------------------------------------*/
32 /* the return value is expected to be in WREG:PRODL, therefore we choose return
33 * type void here. Generic pointer is expected to be in WREG:PRODL:FSR0L,
34 * so function arguments are void, too */
48 void _gptrget4(void) _naked
51 /* decode generic pointer MSB (in WREG) bits 6 and 7:
61 /* data are already in FSR0 */
65 movff _POSTINC0, _PRODL
66 movff _POSTINC0, _PRODH
67 movff _POSTINC0, _FSR0L
78 movff _FSR0L, _TBLPTRL
79 movff _PRODL, _TBLPTRH
82 /* fetch first byte */
86 /* fetch second byte */
90 /* fetch third byte */
94 /* fetch fourth byte */
103 /* unimplemented yet */