Teensy 3 Support

[bgould]

I've got preliminary support for Teensy 3.0/3.1 working... I based my work on the mbed stuff from the dev branch and was able to get ps2_usb working

I merged the dev branch into the master branch, and then added Teensy 3 support on top of that, so it should merge pretty cleanly with your master branch if/when you choose to do so

My implementation probably needs a little bit of cleaning up, especially since I'm fairly certain I broke the other builds :)

Nevertheless, here the branch with my changes if you'd like to take a look:

bgould/tmk_keyboard@tmk:master...2219257

Also, the following things aren't working yet:

• no NKRO yet
• scroll wheel left and right don't appear to be available in the Teensy 3 libraries
• only 8 media keys for consumer keys
• no system keys
• need to use teensy_gateway program instead of hid_listen for debug console
• EEPROM not implemented, thus BOOTMAGIC does not work
• command.c does not compile yet; thus COMMAND_ENABLE does not work

If you're interested in merging in any of these changes I can do whatever cleanup is necessary first and do a pull request

Thanks

[tmk]

Great job! I'll look into your code.

I have a plan to support Cortex MCUs with mbed library and its HAL layer code. If I can understand it correctly, to support new Cortex MCU what we need to do is just to write HAL code for it. And HAL code of many MCUs are already written in mbed community and its number will grow further.
I'll support Teensy3 this way some day in future but its process is slow like snail 🐌

[bgould]

I had never heard of HAL before, it looks interesting, and seems like a good plan.

The USB libraries are pretty limited on the Teensy 3, such as no left-right mouse wheel support, limited consumer key support and no system keys support... I may dig into into that at some point. However the core TMK system needed almost no modification outside of the refactoring that you already did for mbed... PJRC did a lot in the Teensy 3 libraries for AVR libc compatibility (such as providing an avr/pgmspace.h and other avr/* header files) so my time was mostly spent on the build system. I'm using this ofr my currnet project so I should know more in the future about any pitfalls.

BTW I'm always impressed with how well you have things architected and your attention to detail when I dig through your code, its very nice to work with :)

[tmk]

Cortex-M(mbed) support was integrated now.