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/*-------------------------------------------------------------------------
gptrput1.c - put 1 byte value at 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.
-------------------------------------------------------------------------*/
/* write address is expected to be in WREG:PRODL:FSR0L while
* write value is in TBLPTRH:TBLPTRL:PRODH:[stack] */
extern int FSR0H;
extern int POSTINC0;
extern int PREINC1;
extern int PRODL;
extern int WREG;
extern int __eeprom_gptrput1;
void _gptrput1(void) __naked
{
__asm
/* decode generic pointer MSB (in WREG) bits 6 and 7:
* 00 -> code (unimplemented)
* 01 -> EEPROM
* 10 -> data
* 11 -> data
*
* address: (WREG, PRODL, FSR0L)
* value: (TBLPTRH, TBLPTRL, PRODH, STACK1[+1])
*/
btfss _WREG, 7
bra _lab_01_
/* data pointer */
/* FSR0L is already set up */
movff _PRODL, _FSR0H
movff _PREINC1, _POSTINC0
return
_lab_01_:
/* code or eeprom */
btfsc _WREG, 6
goto ___eeprom_gptrput1
/* code pointer, cannot write code pointers */
return
__endasm;
}
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