micropython/ports/zephyr
Paul Sokolovsky c4a6d9c631 zephyr: Switch back to enabling I2C in board-specific configs.
I2C can't be enabled in prj_base.conf because it's a board-specific
feature.  For example, if a board doesn't have I2C but CONFIG_I2C=y then
the build will fail (on Zephyr build system side).  The patch here gets the
qemu_cortex_m3 build working again.
2019-05-24 15:33:02 +10:00
..
src zephyr: Rename CONFIG_CONSOLE_PULL to CONFIG_CONSOLE_SUBSYS. 2018-06-27 15:33:59 +10:00
.gitignore ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
CMakeLists.txt zephyr/CMakeLists.txt: Set AR to point to the Zephyr toolchain exe. 2019-04-11 12:24:05 +10:00
Kbuild ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
Makefile zephyr/i2c: Add support for hardware i2c. 2019-03-26 16:16:26 +11:00
Makefile.zephyr ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
README.md zephyr/README: Reorder content related to recently added I2C. 2019-05-24 15:29:29 +10:00
help.c py/builtinhelp: Change signature of help text var from pointer to array. 2017-09-12 16:03:52 +10:00
machine_i2c.c zephyr/machine_i2c: Update to support new C-level I2C API. 2019-05-20 15:04:29 +10:00
machine_pin.c ports: Convert legacy uppercase macro names to lowercase. 2019-02-12 14:54:51 +11:00
main.c zephyr/main: After builtin testsuite, drop to REPL. 2018-05-21 10:35:16 +10:00
make-bin-testsuite zephyr: Add support for binary with builtin testsuite. 2017-12-15 12:10:39 +02:00
make-minimal ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
makeprj.py ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
modmachine.c zephyr/i2c: Add support for hardware i2c. 2019-03-26 16:16:26 +11:00
modmachine.h ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
modusocket.c py/warning: Support categories for warnings. 2019-01-31 16:48:30 +11:00
modutime.c ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
modzephyr.c zephyr/modzephyr: Revamp stacks_analyze() call. 2019-03-12 17:11:09 +11:00
modzsensor.c zephyr/modzsensor: Rename "TEMP" sensor channel to "DIE_TEMP". 2019-03-12 17:11:30 +11:00
mpconfigport.h zephyr/i2c: Add support for hardware i2c. 2019-03-26 16:16:26 +11:00
mpconfigport_bin_testsuite.h zephyr: Add support for binary with builtin testsuite. 2017-12-15 12:10:39 +02:00
mpconfigport_minimal.h ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
mphalport.h zephyr/i2c: Add support for hardware i2c. 2019-03-26 16:16:26 +11:00
prj_96b_carbon.conf ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
prj_base.conf zephyr: Switch back to enabling I2C in board-specific configs. 2019-05-24 15:33:02 +10:00
prj_disco_l475_iot1.conf zephyr: Add prj_disco_l475_iot1.conf with sensor drivers. 2018-05-21 10:35:16 +10:00
prj_frdm_k64f.conf zephyr: Switch back to enabling I2C in board-specific configs. 2019-05-24 15:33:02 +10:00
prj_frdm_kw41z.conf zephyr: Switch back to enabling I2C in board-specific configs. 2019-05-24 15:33:02 +10:00
prj_minimal.conf zephyr/prj_minimal.conf: Switch to CONFIG_STDOUT_CONSOLE. 2019-03-12 17:11:46 +11:00
prj_qemu_cortex_m3.conf zephyr: Rename CONFIG_CONSOLE_PULL to CONFIG_CONSOLE_SUBSYS. 2018-06-27 15:33:59 +10:00
prj_qemu_x86.conf zephyr: Rename CONFIG_CONSOLE_PULL to CONFIG_CONSOLE_SUBSYS. 2018-06-27 15:33:59 +10:00
uart_core.c zephyr: Rename CONFIG_CONSOLE_PULL to CONFIG_CONSOLE_SUBSYS. 2018-06-27 15:33:59 +10:00
z_config.mk ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00

README.md

MicroPython port to Zephyr RTOS

This is an work-in-progress port of MicroPython to Zephyr RTOS (http://zephyrproject.org).

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).

Features supported at this time:

  • REPL (interactive prompt) over Zephyr UART console.
  • utime module for time measurements and delays.
  • machine.Pin class for GPIO control.
  • machine.I2C class for I2C control.
  • usocket module for networking (IPv4/IPv6).
  • "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.

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 firmware in QEMU (for BOARDs like qemu_x86, qemu_cortex_m3):

make run

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.

For deploying/flashing a firmware on a real board, follow Zephyr 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).

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)

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.

Example of using I2C to scan for I2C slaves:

from machine import I2C

i2c = I2C("I2C_0")
i2c.scan()

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, 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 contrast to the "default" build, which may get more and more features enabled over time.

To make a minimal build:

./make-minimal BOARD=<board>

To run a minimal build in QEMU without requiring TAP networking setup run the following after you built image with the previous command:

./make-minimal BOARD=<qemu_x86_nommu|qemu_x86|qemu_cortex_m3> run