I think no one has done it even though I raised this proposition
quite some time ago. I think it is a worthy effort even though
PICKit 2 is on the horizon. I will be very much interested in your
design.

1) ASM would be better. C18 is not cheap and the student version
has some limitations. However since you have done it in C18,
it may be not necessary to port it to ASM if there is too much
effort involved.
2) PID control: again ASM and you have done it already, right?
3) ICSP: again ASM. It is the common language for the PIClisters. :)
Actually I do not see many discussion for C (including C18) here.

I have some more suggestions.
1) Is it possible to implement Olin's protocol? The tricky part
is that Olin's host program will not work since this one is based
on USB.
2) Have you written the host program? It would be wonderful
if it is written in a cross platform language like c or python.
3) PICkit 1 is using a 6MHz ceramic oscillator and you need to
use 4Mhz oscillators (or 8Mhz, etc) for the 18F USB parts. Anyway
since you do not really own a PICKit 1, it does not matter.


Regards,
Xiaofan

----------------------------------------------
Xiaofan Chen
R&D Engineer, Photoelectric Sensor Development
Pepperl+Fuchs Singapore
http://www.pepperl-fuchs.com
Signals for the world of automation
--------------------------------------------

-----Original Message-----
From: WH Tan [mailto:whsiung@tm.net.my]
Sent: Saturday, July 02, 2005 8:17 AM
To: Microcontroller discussion list - Public.
Subject: [PIC] PICKit1 & PIC18F2550


Hello,

I recall vaguely that someone has written about replacing the PICKit1 
controller with a PIC18F USB controller. Anyway I can't remember any 
result mentioned here.

Has anyone done it?

I'm on my way doing this and I believe I'm just a step away from 
completing it. I would like to discuss with anyone who did/do the 
same.

Points of discussion are:

1) What the language used for implement USB interface? ASM or USB 
framework in C18 provided by Microchip, or any other language?

2) PID control for Vpp. Again what is the language used?

3) ICSP implemention: again what's the language used?

I'm using the C18 framework for the USB interface. For Vpp PID 
control, I have ported the ASM source for PIC16C745 to PIC18F2550. Now 
the tricky part is I yet to decide to port the ASM ICSP protocol to 
PIC18 instructions, or rewriting it in C18. Both method will have its 
pros and cons. I would like to hear from those who have done this.

Thanks & best regards,
WH Tan 

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