Ok, I will try to explain but please English is not
my first language, so forgive my mistakes.

>Two questions.
>1) What is going to be your licensing?
FREE for ANY use.

>2) While I understand the support issue, can I personally get a copy to
take a look at >under whatever licensing terms you plan to use. I
promise I won't ask any questions.
You can ask any question.

I developed this bootloader because I needed it and I needed in a
hurry. I tried several but none worked with 16F819 so I did it.
I called it ProPic Loader because of my ProPic 2 Programmer.

It's very simple, uses only 178 words, it's not well commented
but works just fine. I'm using the internal oscilator and comunicating
at 2400bps.

Basically it sends a 'P' caracter at the boot time and waits for a
command.
If in 0.52s it doesn't receive any command, it boots the user code or if
there is no user code, it repeats the above.

The commands are:
'E' - erase the memory and re-write some of the bootloader code.
'B' - boot the user code.
'W' - write a 4 words code.

The two main problem I had with the 16F819 are the 32 words
erase block and 4 words writing block.

What I did to solve the second problem was send data in 4 words blocks
with the address. Every 4 words block is preceeded with it's address.
I know it's not that efficient but hey I was in a hurry :-)

The 32 words erase block problem was solved re-writing the bootloader
code everytime it's erased.

The asm code and Delphi downloader are available at:
http://propic2.com/ploader/

I hope it will be usefull for someone else.

Regards,

Octavio Nogueira
Tato Equipamentos Eletr=F4nicos Ltda
(11) 5506-5335
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
nogueira@tato.ind.br                  ICQ# 222558485
BASIC Step - O microcontrolador mais f=E1cil do mercado
BASCOM - O mais poderoso compilador BASIC para ATMEL
http://www.tato.ind.br
ProPic tools - low cost PIC programmer and emulator
http://www.propic2.com            =20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=20

-----Mensagem original-----
De: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]
Em nome de Byron A Jeff
Enviada em: quarta-feira, 23 de junho de 2004 17:52
Para: PICLIST@MITVMA.MIT.EDU
Assunto: Re: RES: [PIC]: Self-programming via rs232 of the 16F88 ?


On Wed, Jun 23, 2004 at 03:49:34PM -0300, Tato wrote:
> I have developed a bootloader for 16F819 that uses less
> then 256 words and works very well.
>
> The bootloader and Windows downloader are ready but the documentation=20
> aren't. This is why I didn't released it yet.



I hope it'll be open source. Then that'll be one less item on my list of
things to do that I won't have to worry about.

Thanks,

BAJ

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