On 2017-03-15 01:08 PM, Christopher Browne via talk wrote:
Since you're working with USB keyboards on the Planck, you'll likely be using an ATMega32U. This is a variant of the µc used in the Arduino that adds direct USB support. DFU's the main programming tool for the USB Atmel chips. I *think* you can use avrdude with the 'U ATMegas too. For tiny cheap projects I rather like the ATTiny167, built into boards like the Digispark Pro <http://digistump.com/products/109>. It talks USB directly too. As Peter said, the Atmel processors need very little interfacing, and can be run directly from the breadboard, as in the ShrimpingIt <http://start.shrimping.it/> project. I started building a barebones board, but it got a bit luxe with an expensive LDO regulated power supply and other features: https://www.flickr.com/photos/scruss/30298881645 While the Atmel chips do have a great opcode set, I've mostly programmed them in C, and will admit that generally the Wiring/Arduino language does me well. Lower level embedded C always looks like a mess of ports and bit masking to me, and doesn't flow as a high level language. "Make: AVR Programming" by Elliot Williams is a decent book on non-Arduino AVR C development cheers, Stewart