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I've looked around a ton so it's probably not available but does anyone know if there is a usable core for the ATMega16u2 (the chip the Uno and Due uses for USB to Serial). I have a project I was going to use the 32u4 for but they aren't really available for several months and the 16u2 has all the functionality that I would really need.

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  • "171 in stock" Jun 29, 2014 at 15:24
  • I need the actual IC, NOT a board that already has it.
    – Adam Haile
    Jun 29, 2014 at 15:25
  • :O I... I don't think I've ever seen so many 0s before... Newark has a few -MUs, but I think someone bought up the world's supply of -AUs. Jun 29, 2014 at 15:40
  • Yup :( Was very dissapointed that basically no one has them...
    – Adam Haile
    Jun 29, 2014 at 15:40
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    A thought just occurred to me. If a 16U2 will do, then why not use a 16U4 instead? All you'd need to change is the amount of flash available. And DigiKey has a few hundred of those in stock in -AU. Jun 30, 2014 at 4:08

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As @IgnacioVazquez-Abrams said, a 16u4 is virtually identical with a 32u4, so you can use a Leonardo or Micro core with a tiny modification to boards.txt. A 16u2 is a rather different animal, with fewer timers, many fewer pins, and no A/D converter, so you’d have to do a fair amount of editing to obtain a usable Arduino core.

That said, if you’re reasonably fluent in C++, building your own Arduino core is not very difficult, and I found it an instructive exercise. If you care about getting your project up as quickly as possible and not get sidetracked, however, go with the 16u4.

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