Hi everyone,
I'm working on a USB project, and for that project I find I'm not using the Arduino side of the Arduino Uno R3 that I've bought. I'm not programming any sketches, I'm just reprogramming the ATMega16u2 to emulate a USB device. I'm using the DFU interface to do the programming. Is there a more appropriate board I should use that would be cheaper, and smaller than an Uno?
I hope I've been clear, and I've used the correct terms, if not please let me know. Many thanks in advance!
http://arduino.cc/en/Main/ArduinoBoardMicro
The Micro is similar to the Arduino Leonardo in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behavior of the board; these are detailed on the getting started page.
When a 'u2 chip is used as a secondary part on a board (like the UNO), they tend to use the 16u2, because it's a little cheaper in quantity. When it is used as the main part on a board, it seems the 32u2 is used more often. The great thing is they are .hex file compatible, especially 16u2 code on a 32u2 (more memory). I've loaded the 16u2 Arduino Serial .hex file on a number of 32u2 boards with complete success. Just Google "atmega32u2 board", and you'll get a a little list. I've used the NooGroove, and the Minimus.
While I wouldn't want to sway someone from using a 32u4, it is different from a 32u2, so if you've been working with a 16u2, you'll have to make changes for compatibility.
Of course, if you're dealing with either the 32u2 or the 32u4, you should start where the original Arduino UNO USB/Serial code for the 8u2 was derived from - LUFA @ www.fourwalledcubicle.com/LUFA.php .
Thanks for the suggestions. There appears to be a few alternatives I'll look in to 