Hello,

Yes I've saw that application notes (851 IIRC), though it seems like it wasn't what I was looking for.

Someone at irc told me that a bootfile isn't needed at all when trying to do things such like blinking leds, and that I could flash that code directly within the pic and it will work.

Then I though on just getting an output pin high so I could start by turning on the led before even trying to make it blink. Started looking at gpasm's documentation, got the original configuration bits from microchip's MCHPFSUSB, which are these:

       ;; CONFIG1L Options
        _CPUDIV_OSC1_PLL2_1L
        _PLLDIV_5_1L
        _USBDIV_2_1L

        ;; CONFIG1H Options
        _FOSC_HSPLL_HS_1H
        _FCMEM_OFF_1H
        _IESO_OFF_1H

        ;; CONFIG2L
        _PWRT_OFF_2L
        _BOR_ON_2L
        _BORV_21_2L
        _VREGEN_ON_2L

        ;; CONFIG2H
        _WDT_OFF_2H             ; watchdog timer
        _WDTPS_32768_2H         ; watchdog post-scaler

        ;; CONFIG3H
        _MCLRE_ON_3H            ;  mclr enabled, re3 disabled
        _LPT1OSC_OFF_3H         ; low power timer1
        _PBADEN_ON_3H           ; portb<4:0> digital input on reset

        ;; CONFIG4L
        _STVREN_ON_4L           ;  stack overflow reset
        _LVP_OFF_4L             ;  low voltage programming

        _ICPRT_OFF_4L           ;  dedicated in-circuit port
        _DEBUG_OFF_4L           ;  debug

        ;; CONFIG5L
        _CP0_OFF_5L             ;  code protect 
        _CP1_OFF_5L             ;  code protect  

        ;; CONFIG5H
        _CPB_OFF_5H             ;  boot block code protection

        ;; CONFIG6L
        _WRT0_OFF_6L            ; write protection
        _WRT1_OFF_6L            ; write protection

        ;; CONFIG6H
        _WRTB_ON_6H            ; boot block write protection
        _WRTC_OFF_6H            ; configuration register write protection

        ;; CONFIG7L
        _EBTR0_OFF_7L           ; Table Read Protection
        _EBTR1_OFF_7L           ; Table Read Protection

        ;; CONFIG7H
        _EBTRB_OFF_7H           ; Boot Block Table Read Protection


But then, if I try this:

        Processor       18f4550
        #include <p18f4550.inc>
        __CONFIG (_CPUDIV_OSC1_PLL2_1L & _PLLDIV_5_1L & _USBDIV_2_1L & FOSC_HSPLL_HS_1H & _FCMEM_OFF_1H & _IESO_OFF_1H & _PWRT_OFF_2L & _BOR_ON_2L & _BORV_21_2L & _VREGEN_ON_2L & _WDT_OFF_2H & WDTPS_32768_2H & CLRE_ON_3H & _LPT1OSC_OFF_3H & _PBADEN_ON_3H _STVREN_ON_4L & _LVP_OFF_4L & _ICPRT_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L & _CP0_OFF_5L & _CP1_OFF_5L & _CPB_OFF_5H & _WRT0_OFF_6L & _WRT1_OFF_6L & _WRTB_OFF_6H & _WRTC_OFF_6H & _EBTR0_OFF_7L & _EBTR1_OFF_7L & _EBTRB_OFF_7H) 

END

I get error 103 (syntax error). If I get rid of all but those which define clock and spped settings I get this:

blink.asm:3:Warning [212] 18cxxx devices should specify __CONFIG address

where neither the documentation specifies __CONFIG as an instruction that expects an address, nor warning 212 appears on the documentation.

I haven't seen either on the internet examples for gpasm appart from those on gputils-extra and which would be really helpfull, as I could make use of them together with the documentation and understand how this goes.

Cand someone tell me something about?

Best Regards,


----- Original Message -----
From: John Chung <kravnus@yahoo.com>
Date: Thursday, November 2, 2006 2:59 am
Subject: Re: [PIC] looking for a bootfile's source code
To: "Microcontroller discussion list - Public." <piclist@mit.edu>

> do you mean bootloader? There is an application in
> microchip.com itself. check it out.
> 
> John
> 
> --- antoniarodri@canarias.org wrote:
> 
> > Hello,
> > 
> > I've been a few months around pics, though I
> > consider myself as a complete ignorant on the
> > subject.
> > 
> > I'd like to know if there's anywhere I cand find a
> > boot file's source code so I can study it, burn it,
> > try it and learn how all of this work together with
> > userspace applications (just flashing a led is mi
> > goal by now).
> > 
> > What I'm using is a pic18f4550, I've already seen
> > microchip's usb project zip for building it with
> > MPLAB, though I've left usb right appart by now as
> > it's way too much the knowledge I have at the
> > moment. Appart from it, I'm not using windows but
> > linux.
> > 
> > So I wonder if is there somewhere users could find
> > sdcc, or gpasm bootfiles' source code for this model
> > of PIC? any close model would also be helpful
> > 
> > Thanks so much for any pointers or advises.
> > 
> > Best Regards,
> > 
> > 
> > -- 
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> > 
> 
> 
> 
> 
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