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 teh application on a real board, follow Zephyr

documentation for a given board.