gnupic: Re: [gnupic] PIC-based PIC programmer?
Subject:
Re: [gnupic] PIC-based PIC programmer?
From:
acemailone ####@####.####
Date:
7 Jul 2005 23:49:28 +0100
Message-Id: <42CDB162.6080206@rogers.com>
Hi
Some time ago I got a couple of PIC16F88 chips. I had only ICD1 that I
build myself but this is not working for 16F88.
So I built a programmer based on 16F877 to program one 16F88 with a
bootloader. Then I rebuilt this programmer to be based on 16F88.
I wrote the firmware for this programmer, and currently supports only 16F88.
To program other chips this firmware can be changed or a new firmware
can be created.
The bootloader of the 16F88 that is the programmer is a modified version
of Sparkfun bootloader. I did some changes regarding code bumping.
For now my programmer creates 5V and 13V using 7805 and LM317 but I
found a schematic to use the charge pump of MAX232 to generate the
programming voltage. This way it will require only 5V as power for the
programmer.
The PC application implements a serial protocol to talk to the
programmer. This is done in Delphi but can be ported to any language.
If there is any interest in this I will try to upload some
files/pictures in the file section.
Adrian
David McNab wrote:
>Hi,
>
>Does anyone know of a PIC programmer which itself is based on a PIC
>chip, and which only uses the bare minimum of parts?
>
>Conceivably, a PIC-based PIC programmer would only need:
> - a PIC
> - a crystal or resonator
> - a MAX232 or equivalent, plus charge pump capacitors
> - maybe a transistor or two, in case the programmer needs to
> bludge some +12V from the MAX232 and switch it into the target PIC
> - a couple of buttons and LEDs.
>
>If a PIC chip had the programming code plus a bootloader, it would only
>need to duplicate its own code into the target PIC, and then could
>function independently of the host computer when it's just being used to
>burn other PICs.
>
>Such a thing, published with PIC code, host code and PCB artwork, would
>be a human-facilitated benevolent 'PIC virus'.
>
>"Give your friends a pre-programmed PIC, together with the PCB artwork
>and host software". Would be a brilliant geek birthday/xmas present! :)
>
>So, does such a thing exist?
>
>
>
