MicroPython port to Zephyr RTOS

This is an initial port of MicroPython to Zephyr RTOS (http://zephyrproject.org).

The port integrates well with Zephyr build system, using the latest features which will be available in 1.6.0, and thus requires Zephyr master to build against. All boards supported by Zephyr should be supported (but not all were tested).

At this time, only basic interactive prompt (REPL) over UART connection is supported. Over time, bindings for various Zephyr subsystems may be added.

Building

Follow to Zephyr web site for Getting Started instruction of installing Zephyr SDK, getting Zephyr source code, and setting up development environment. (Direct link: https://www.zephyrproject.org/doc/getting_started/getting_started.html). You may want to build Zephyr's own sample applications to make sure your setup is correct.

To build MicroPython port, in the port subdirectory (zephyr/), run:

make BOARD=<board>

If you don't specify BOARD, the default is qemu_x86 (x86 target running in QEMU emulator). Consult Zephyr documentation above for the list of supported boards.

Running

To run the resulting application in QEMU (for BOARDs like qemu_x86, qemu_cortex_m3):

make qemu

For deploying/flashing the application on a real board, follow Zephyr documentation for a given board.