I'm considering making a unit using an 18F452 and a FTDI USB chip
(either the 232 or the 245, I'm not sure which). One of the FTDI
chips has a serial interface, the other has a bidirectional FIFO with
a parallel interface.

Has anyone used these chips with a bootloader? Any comments on its
effectiveness?

I see a couple of serial bootloaders for this chip, including one in
an app note from Microchip, and also ones from:

Martin Dubuc (derivative of the Microchip one):
http://members.rogers.com/martin.dubuc/Bootloader/

Shane Tolmie's doesn't appear to have any source:
http://www.microchipc.com/PIC18bootload

Ideas? I'd also like to be able to use the same interface to talk to
the PIC during normal operation, so there must be some way to
dynamically vector to the bootloader (and, I suppose, the bootloader
must be in series with the received-character interrupt, or the
interrupt handler will have to notify the loader when in bootloader
mode).

Thanks,
--
Ned Konz
http://bike-nomad.com
GPG key ID: BEEA7EFE

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