You could provide this as an ICSP which could be self contained on a PIC
including the code for the upgrade (assuming it would fit wihtin the
code space). However for devices which support flash reprogramming there
is no doubt that it is MUCH cheaper to provide a bootloader and some
kind of PC interface than any autonomous device.

If you are interested in bootloader programming my company supplies a
solution within a C Compiler - drop us a line for more infor

Robin Abbott
 
Forest Electronic Developments
PIC C Compiler RAD and simulation
 
01590 681511
+44 1590 681511 (phone/fax)
 
See our web pages : www.fored.co.uk 
 


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of alan smith
Sent: 24 January 2005 19:55
To: Microcontroller discussion list - Public.
Subject: [PIC] Bootloader vs. reloader


I've seem some discussions on bootloaders and
something about a device that would simply allow a
field upgrade to an existing device...I think.

Seems to me, that you could stream out the hex file
with a device, that provided the Vpp to actually do a
field update.  Simply send it out to the customer,
they reload and send the unit back.

I'm sure they exist....I'd like to see one for an
16F877, but again, its the programming algorithim that
changes from chip to chip.


		
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