2016-10-10 19:21:45 +01:00
|
|
|
MicroPython port to Zephyr RTOS
|
|
|
|
===============================
|
|
|
|
|
2017-05-12 20:05:07 +01:00
|
|
|
This is an work-in-progress port of MicroPython to Zephyr RTOS
|
2016-10-10 19:21:45 +01:00
|
|
|
(http://zephyrproject.org).
|
|
|
|
|
2017-05-12 20:05:07 +01:00
|
|
|
This port requires Zephyr version 1.8 or higher. All boards supported
|
|
|
|
by Zephyr (with standard level of features support, like UART console)
|
|
|
|
should work with MicroPython (but not all were tested).
|
2016-10-10 19:21:45 +01:00
|
|
|
|
2016-10-28 19:51:18 +01:00
|
|
|
Features supported at this time:
|
|
|
|
|
|
|
|
* REPL (interactive prompt) over Zephyr UART console.
|
|
|
|
* `utime` module for time measurements and delays.
|
2019-03-18 13:54:08 +00:00
|
|
|
* `machine.I2C` class for I2C control.
|
2016-10-28 19:51:18 +01:00
|
|
|
* `machine.Pin` class for GPIO control.
|
2017-05-12 20:05:07 +01:00
|
|
|
* `usocket` module for networking (IPv4/IPv6).
|
2016-10-28 19:51:18 +01:00
|
|
|
* "Frozen modules" support to allow to bundle Python modules together
|
|
|
|
with firmware. Including complete applications, including with
|
|
|
|
run-on-boot capability.
|
|
|
|
|
|
|
|
Over time, bindings for various Zephyr subsystems may be added.
|
2016-10-10 19:21:45 +01:00
|
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
-------
|
|
|
|
|
2016-10-28 19:51:18 +01:00
|
|
|
To run the resulting firmware in QEMU (for BOARDs like qemu_x86,
|
2016-10-10 19:21:45 +01:00
|
|
|
qemu_cortex_m3):
|
|
|
|
|
2017-11-01 13:16:01 +00:00
|
|
|
make run
|
2016-10-10 19:21:45 +01:00
|
|
|
|
2017-02-01 18:23:29 +00:00
|
|
|
With the default configuration, networking is now enabled, so you need to
|
|
|
|
follow instructions in https://wiki.zephyrproject.org/view/Networking-with-Qemu
|
|
|
|
to setup host side of TAP/SLIP networking. If you get error like:
|
|
|
|
|
|
|
|
could not connect serial device to character backend 'unix:/tmp/slip.sock'
|
|
|
|
|
|
|
|
it's a sign that you didn't followed instructions above. If you would like
|
|
|
|
to just run it quickly without extra setup, see "minimal" build below.
|
|
|
|
|
2016-10-28 19:51:18 +01:00
|
|
|
For deploying/flashing a firmware on a real board, follow Zephyr
|
2017-02-17 19:06:52 +00:00
|
|
|
documentation for a given board, including known issues for that board
|
|
|
|
(if any). (Mind again that networking is enabled for the default build,
|
|
|
|
so you should know if there're any special requirements in that regard,
|
|
|
|
cf. for example QEMU networking requirements above; real hardware boards
|
|
|
|
generally should not have any special requirements, unless there're known
|
|
|
|
issues).
|
2016-10-28 19:51:18 +01:00
|
|
|
|
|
|
|
|
|
|
|
Quick example
|
|
|
|
-------------
|
|
|
|
|
|
|
|
To blink an LED:
|
|
|
|
|
|
|
|
import time
|
|
|
|
from machine import Pin
|
|
|
|
|
|
|
|
LED = Pin(("GPIO_1", 21), Pin.OUT)
|
|
|
|
while True:
|
|
|
|
LED.value(1)
|
|
|
|
time.sleep(0.5)
|
|
|
|
LED.value(0)
|
|
|
|
time.sleep(0.5)
|
|
|
|
|
2019-03-18 13:54:08 +00:00
|
|
|
To scan for I2C slaves:
|
|
|
|
|
|
|
|
from machine import I2C
|
|
|
|
|
|
|
|
i2c = I2C("I2C_0")
|
|
|
|
i2c.scan()
|
|
|
|
|
2016-10-28 19:51:18 +01:00
|
|
|
The above code uses an LED location for a FRDM-K64F board (port B, pin 21;
|
|
|
|
following Zephyr conventions port are identified by "GPIO_x", where *x*
|
|
|
|
starts from 0). You will need to adjust it for another board (using board's
|
|
|
|
reference materials). To execute the above sample, copy it to clipboard, in
|
|
|
|
MicroPython REPL enter "paste mode" using Ctrl+E, paste clipboard, press
|
|
|
|
Ctrl+D to finish paste mode and start execution.
|
2016-11-04 21:22:37 +00:00
|
|
|
|
|
|
|
|
|
|
|
Minimal build
|
|
|
|
-------------
|
|
|
|
|
|
|
|
MicroPython is committed to maintain minimal binary size for Zephyr port
|
|
|
|
below 128KB, as long as Zephyr project is committed to maintain stable
|
|
|
|
minimal size of their kernel (which they appear to be). Note that at such
|
|
|
|
size, there is no support for any Zephyr features beyond REPL over UART,
|
2017-05-12 20:05:07 +01:00
|
|
|
and only very minimal set of builtin Python modules is available. Thus,
|
|
|
|
this build is more suitable for code size control and quick demonstrations
|
|
|
|
on smaller systems. It's also suitable for careful enabling of features
|
|
|
|
one by one to achieve needed functionality and code size. This is in the
|
2017-03-12 20:41:19 +00:00
|
|
|
contrast to the "default" build, which may get more and more features
|
|
|
|
enabled over time.
|
2016-11-04 21:22:37 +00:00
|
|
|
|
|
|
|
To make a minimal build:
|
|
|
|
|
2017-03-12 20:41:19 +00:00
|
|
|
./make-minimal BOARD=<board>
|
2017-02-01 18:23:29 +00:00
|
|
|
|
|
|
|
To run a minimal build in QEMU without requiring TAP networking setup
|
|
|
|
run the following after you built image with the previous command:
|
|
|
|
|
2017-12-14 12:08:37 +00:00
|
|
|
./make-minimal BOARD=<qemu_x86_nommu|qemu_x86|qemu_cortex_m3> run
|