HP15c CE POGO programming cable

[brouhaha]

I use Linux nearly exclusively, but I was not able to get SAM-BA working on it. I resorted to using SAM-BA on Windows in a VMware, and that worked.

I verified that the Atmel device in boot mode was showing up in lsusb, and I think the permissions were OK, but I'm not 100% certain. I'll look into it in the future.

I'm thinking about writing my own replacement for SAM-BA, in C++ using Qt6 for cross-platform capability, specifically to make it easier to deal with the 2015 and later calculators, such as the newer 12C and the 15C CE. I don't currently plan to support the older ARM-based devices from 2008 to 2015, though maybe those could be added.

Although the SAM-BA protocol is documented by Atmel (now Microchip), I plan to capture traces of the actual USB CDC (virtual serial port) traffic, to see the exact sequences that are used for the SAM4LC. Apparently Atmel made the source code for the SAM4LC bootloader available in the past, but AFAICT since Atmel was acquired by Microchip those have been lost in the shuffle. I haven't sent a support request for them as I shouldn't really need them.