In the next couple of weeks I'm going to have to write a bootloader
for our ATmega128-based autonomous car project. We have a SparkFun
BlueSMiRF Bluetooth serial link to the car, which shows up as a
serial port on a Bluetooth-enabled PC (in this case, a Mac). It's
just as if I had a serial cable connected directly to the '128.
I want to write a bootloader for the ATmega128 and a little command-
line tool that can open the serial port, talk to the bootloader, and
report back. I'm an experienced Mac programmer but not terribly
familiar with the POSIX API for talking to a serial port. I've also
written basic code for the '128, know how to use the serial port, but
I've never written a boot loader. I did read the section in the
datasheet on it, though.
I've looked at the app notes on Atmel's site, and all I can find has
to do with DES-encrypted firmware loading. I can probably glean a lot
of what I need from that, and just throw out the crypto parts (we
don't need crypto support).
However, I figure this has been done more than once, and maybe
someone's put that code (both firmware and POSIX tool) into the
public domain. At the very least, perhaps someone can point out
pitfalls and make suggestions.
Anything would be welcome. Thanks!
--
Rick
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