Marlin supports 5-6 different AT90USB1286 based boards. They’ve always been a pain when it comes to IDE support. I’d really like to get them supported by PlatformIO.
Some of them have a DFU bootloader on them. They’re supposed to be unloadable by the Teensyduino loader that pops up when I use PlatformIO and the teensy platform. Based on my sample of one I’m beginning to have doubts.
Sample of one is definitely not ideal. I have a couple of different flavors on order so hopefully I can have more confidence in what I’m seeing.
I was able to upload my sample of one via the dfu-programmer in the Linux environment. When I try PlatformIO the teensy loader pops up, tells me to press the button and then exits about 5 seconds later no matter what I do or don’t do.
Besides a learning curve I think there may be some apples/oranges going on. The Teensy site says Half Kay and others tell me that it’s DFU. No way to tell for sure until I get my hands on a real Teensy++2.0.
Others have a CDC bootloader. That combo is not yet supported by PlatformIO. I’ll be looking into adding a board to the Arduino platform to support this. I have verified that the Arduino platform will compile for this chip & that the image at least boots to the command prompt.