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'[PIC]: Bootloader for 18F252?'
2004\05\21@164350 by Philip Pemberton

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Hi,
 Does anyone know of a PIC bootloader that's capable of running on a
PIC18F252? I've tried "Colt" and "Jolt", neither of them could get a link to
the PIC. Microchip's AN851 wouldn't even assemble.
 Are there any usable bootloaders for the 18F252 that connect to the host
over a serial link? Ideally I'd like something that would sit in the boot
block (progmem address 0x0000 to 0x0200).

Thanks,
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2004\05\21@165635 by William Bross

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Phil,

You can try:

http://www.ac.ugal.ro/staff/ckiku/software/picbootloader.htm

I use it all the time on the 877a.  He claims it works on the 18f252.

Bill

{Original Message removed}

2004\05\21@170223 by Paul James E.

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All,

I agree with Bill on this one.   I have tried several bootloaders, and
have had some success with each of them.   But in terms of space used,
and ease of use, this one is second to none.  If it works as well on the
18F252 as it does on the 16F877A, you will be happy.

                                             Regards,

                                               Jim


> Phil,
>
> You can try:
>
> http://www.ac.ugal.ro/staff/ckiku/software/picbootloader.htm
>
> I use it all the time on the 877a.  He claims it works on the 18f252.
>
> Bill
>
> {Original Message removed}

2004\05\21@170224 by Wouter van Ooijen

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>   Does anyone know of a PIC bootloader that's capable of running on a
> PIC18F252?

A bit special, but my ZPL certainly works on an F252. See DB015 for
suitable hardware.

Wouter van Ooijen

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2004\05\21@170850 by Jan-Erik Soderholm

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Wouter van Ooijen wrote :

> >   Does anyone know of a PIC bootloader that's capable of
> >   running on a PIC18F252?
>
> A bit special, but my ZPL certainly works on an F252. See DB015 for
> suitable hardware.

Wouter, I was actualy searching your site for the "ZPL-page"
when your post dropped in.

I don't know, but I can not find any such page directly on your site.
Did I miss it ?

I just found this link to the Circuit Celler contest :
"http://www.circuitcellar.com/flash2002/honorable.htm"....


Jan-Erik.

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2004\05\21@173414 by Harold Hallikainen

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See Microchip AN851. It includes ASM code and a Windoze ap to talk to it
over a serial port.

Harold


{Quote hidden}

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2004\05\21@225154 by Byron A Jeff

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On Fri, May 21, 2004 at 11:09:05PM +0200, Jan-Erik Soderholm wrote:
> Wouter van Ooijen wrote :
>
> > >   Does anyone know of a PIC bootloader that's capable of
> > >   running on a PIC18F252?
> >
> > A bit special, but my ZPL certainly works on an F252. See DB015 for
> > suitable hardware.
>
> Wouter, I was actualy searching your site for the "ZPL-page"
> when your post dropped in.
>
> I don't know, but I can not find any such page directly on your site.
> Did I miss it ?

Wouter doesn't have it on a separate page. It's a ZIP file that sits near
the end of his Dwarf Page here:

http://www.voti.nl/dwarf/index.html

The zip has all the firmware and an excellent 7 page PDF describing the
ZPL system.

BAJ

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2004\05\22@004519 by Wouter van Ooijen

face picon face
> Wouter, I was actualy searching your site for the "ZPL-page"
> when your post dropped in.
>
> I don't know, but I can not find any such page directly on your site.
> Did I miss it ?
>
> I just found this link to the Circuit Celler contest :
> "http://www.circuitcellar.com/flash2002/honorable.htm"....

There is none, but the CC entry is available as .zip file from the dwarf
page at http://www.voti.nl/dwarf

Wouter van Ooijen

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2004\05\22@045757 by Antonio Sergio Sena

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Phil,

it works fine on the 18F252. I use all the time !

Regards,
Antonio Sergio Sena






{Quote hidden}

> > {Original Message removed}

2004\05\22@053813 by Philip Pemberton

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In message <01a501c43fda$953cb2a0$0201a8c0@furao>
         Antonio Sergio Sena <asenaspamKILLspamPRIMETEC.PT> wrote:

> it works fine on the 18F252. I use all the time !
I've just installed the loader on one of my 18F252s - it works flawlessly.
Wow. I didn't even have to make any changes to the linker script :)
The only thing I would like is the source code for the loader - I've got a
circuit attached to the MAX233 that pulls MCLR down when DTR is inactive. I
usually modify the uploader tool to twiddle DTR before uploading the code.
Still, at least this loader works, unlike the other loaders I tried :)

Thanks.
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2004\05\22@222451 by William Bross

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Glad it worked first thing off the bat.  I liked this loader because it was
small but mostly because it was written in assembler and I could easily
change the crystal frequency.  BTW, I emailed Claudio when I first found the
bootloader and asked some questions about the loader source.  He said he's
working on his PhD and if he could find the time to clean it up he 'might'
release it.  Since then, we rolled our own version for commercial use.  The
PIC side is different in the fact that it needed to discriminate between a
code or data download so it's a little larger.

Bill

{Original Message removed}

2004\05\23@044947 by Philip Pemberton

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In message <EraseMEIMEOIFOGIOFDFPBMCJLGAEDOCDAA.wbrossspam_OUTspamTakeThisOuTcinci.rr.com>>          William Bross <wbrossspamspam_OUTCINCI.RR.COM> wrote:

> Glad it worked first thing off the bat.  I liked this loader because it was
> small but mostly because it was written in assembler and I could easily
> change the crystal frequency.
As far as I'm concerned, the only thing "wrong" with it is that it doesn't
use the top 0x200 bytes of flash (the "boot block"), so it's difficult to
protect both its reset vector and the loader itself without losing the
ability to upload new firmware. The relocation is a bit of a pain in C18,
though.
What I wanted was something that would sit at the bottom of the program
flash, wait a few seconds for a connection, then jump to my firmware if it
didn't get a link.

> BTW, I emailed Claudio when I first found the
> bootloader and asked some questions about the loader source.  He said he's
> working on his PhD and if he could find the time to clean it up he 'might'
> release it.
Scruffy code is better than no code at all :)

Later,
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2004\05\24@165938 by Manuel Bessler

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On Fri, 21 May 2004 14:34:55 -0700
Harold Hallikainen wrote:

> See Microchip AN851. It includes ASM code and a Windoze ap to talk to
> it over a serial port.

I have a modified version of the AN851 bootloader (it didn't work out of
the box for me). I use it on a 18F452, so it should work on the 252 as
well.

see here: http://cockpit.varxec.de/software/pic.html

I've also written an uploader program for linux. Its included in the
archive as "an851host.c"
its written in plain C, so it might work under windows as
well if you change the serial device (/dev/ttyS0 under linux to COM1 or
whatever under windoze.)

I think I have a newer version of an851host.c at home... if interested,
please email me.


Manuel

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