Subject:
Re: [gnupic] How do I set configuration bits for 18f252 in gpasm?
From:
"George M. Gallant, Jr." ####@####.####
Date:
9 Jun 2006 04:24:04 +0100
Message-Id: <1149823427.7057.94.camel@scuba.home.net>
David,
FAST is defined on my system
in /usr/local/share/gputils/header/p18f252.inc. As the file
is not stock gputils and the years have not been kind to my little gray
cells, I don't know
if this is supplied by the gputils team or not.
George
On Thu, 2006-06-08 at 16:48 -0400, David Froseth wrote:
> Thanks George for the reply. In the gputils documentation, I could not
> find anything about how to do a settup like you have. Am I missing an
> include file? Maybe this is common knowledge.
>
> Here is what I did to get __config working. At least to me, it looks
> like it is working. Here is some of the gpasm output:
>
> 00021 list p=18f252
> 00022
> 00300001 00023 _config1h equ 0x300001
> 00300002 00024 _config2l equ 0x300002
> 00300003 00025 _config2h equ 0x300003
> 00300005 00026 _config3h equ 0x300005
> 00300006 00027 _config4l equ 0x300006
> 00028
> 00029
> 300000 FAFF 00030 __config _config1h, b'11111010' ;HS
> oscillator
> 00031 __config _config2l, b'11111110'
> ;enable power-up timer
> 300002 FEFE 00032 __config _config2h, b'11111110'
> ;watchdog timer disabled
> 300004 FFFF 00033 __config _config3h, b'11111111' ;
> 300006 FFFB 00034 __config _config4l, b'11111011'
> ;Disable LVP
> 00035
>
> The program address and the program data is where it should be. Since I
> did not define a config1l at 0x300000, the assembler automatically
> writes all 1's with the lower byte of the 0x300000 address being 'FF'.
> 0x300001 is 'FA' as it should be. So, it also seems that my original
> numbers were wrong - unused bits should be written as '1', correct?
>
> I also fixed problems with the 'retfie FAST' instruction.
> I was getting an error:
>
> Error [113] : Symbol not previously defined (FAST).
> 001C 0010 00183 retfie FAST
>
> In the PIC18FXX2 documentation (pg. 217) the retfie instruction word is
> defined as - 0000 0000 0001 000s, where s=1, if you want certain
> registers restored from shadow registers when returning from an
> interrupt (pg. 214).
> So I defined FAST as '1':
>
> FAST equ 0x01
>
> Now I get this output from gpasm:
>
> 001C 0011 00183 retfie FAST
> 00184
>
>
> This seems right since the op-code word is now '0011'h, which equals
> '0000 0000 0001 0001'. Do I have this right?
>
> One last question - Does the '&' symbol in '_OSCS_OFF_1H & _HS_OSC_1H'
> cause gpasm to do an AND logic function on the two bits represented by
> the mnemonics?
>
> Thanks.
>
> George M. Gallant, Jr. wrote:
> > gpasm does a fine job with the 18f252. Here is my current setup.
> >
> > George
> >
> > ; __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H
> > __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HSPLL_OSC_1H
> >
> > __CONFIG _CONFIG2L, _PWRT_ON_2L & _BOR_OFF_2L &
> > _BORV_20_2L
> > __CONFIG _CONFIG2H, _WDT_OFF_2H
> >
> > __CONFIG _CONFIG4L, _DEBUG_OFF_4L & _LVP_OFF_4L &
> > _STVR_ON_4L
> >
> > __CONFIG _CONFIG5L, _CP0_OFF_5L & _CP1_OFF_5L
> > __CONFIG _CONFIG5H, _CPB_OFF_5H & _CPD_OFF_5H
> >
> > __CONFIG _CONFIG6L, _WRT0_OFF_6L & _WRT1_OFF_6L
> > __CONFIG _CONFIG6H, _WRTC_OFF_6H & _WRTB_OFF_6H &
> > _WRTD_OFF_6H
> >
> > __CONFIG _CONFIG7L, _EBTR0_OFF_7L & _EBTR1_OFF_7L
> > __CONFIG _CONFIG7H, _EBTRB_OFF_7H
> >
> >
> >
> >
> > On Thu, 2006-06-08 at 14:24 -0400, David Froseth wrote:
> >
> >
> >>I would like to use gpasm to make a hex file for a 18f252 pic. However,
> >>I am unsure of how to write the code, which sets up the configuration
> >>bits. The 18f parts have several config files located in 0x300001 -
> >>0x30000d of the program memory. How do I write my assembly program so
> >>that gpasm knows what to do?
> >>
> >>I would like to have these values in the various config files:
> >>
> >>config1h = b'00100010'
> >>config2l = b'00001110'
> >>config2h = b'00001110'
> >>config3h = b'00000001'
> >>config4l = b'10000001'
> >>
> >>Thanks for any advice.
> >>
> >>p.s. Does gpasm support all of the additional instructions of the
> >>enhanced 18f parts - i.e. bra, movlb, movff, etc?
> >>
> >>
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