[Sdcc-user] Fuse definitions for pic18f46j50.h

[Richard H. <hug...@gm...>]

Hi all,

I'm the main developer for ColorHug, an open source colorimeter
device. I'm looking to port away from the Microchip tools, and compile
natively using Linux.

I'm using a PIC18F46J50 in the hardware, and need to set certain
config fuses to do things like turning on the watch dog timer and
setting the clock PLL mode. I noticed that the file
device/non-free/include/pic16/pic18f46j50.h is missing all the fuse
#defines, unlike other files like
device/non-free/include/pic16/pic18f2455.h which do have the
constants, e.g.

pic18f2455.h:

/* Configuration register locations */
#define	__CONFIG1L	0x300000
#define	__CONFIG1H	0x300001
...
/* Full-Speed USB Clock Source Selection 1L options */
#define	_USBPLL_CLOCK_SRC_FROM_96MHZ_PLL_2_1L   	0xFF	/* Clock src
from 96MHz PLL/2 */
#define	_USBPLL_CLOCK_SRC_FROM_OSC1_OSC2_1L     	0xDF	/* Clock src
from OSC1/OSC2 */

pic18f46j50.h:

#define __CONFIG1L      0xFFF8
#define __CONFIG1H      0xFFF9
...

Now, i see both files were created by inc2h-pic16.pl which must use
the gputils/header/p18f2455.inc and gputils/lkr/18f46j50.lkr files as
inputs. Looking at these files, it looks like the former has the
_PLLDIV_1_1L type #defines created manually, and the other does not.
To correct the pic18f46j50.h shipped with sdcc, I'm guessing I have to
"fix" the 18f46j50.lkr file in gputils, and then re-run inc2h-pic16.pl
-- does that sound about correct?

Richard