micropython/ports/zephyr
Maureen Helm 2d7ec8e704 zephyr: Enable fatfs.
Enables the fatfs filesystem in the zephyr port.

Example usage with an SD card on the mimxrt1050_evk board:

import zephyr, os
bdev = zephyr.DiskAccess('SDHC')
os.VfsFat.mkfs(bdev)
os.mount(bdev, '/sd')
with open('/sd/hello.txt','w') as f:
    f.write('Hello world')
print(open('/sd/hello.txt').read())
2020-02-07 11:24:06 +11:00
..
src zephyr: Update include paths for Zephyr v2.0. 2020-02-04 17:09:19 +11:00
.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: Enable fatfs. 2020-02-07 11:24:06 +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: Update include paths for Zephyr v2.0. 2020-02-04 17:09:19 +11:00
machine_pin.c zephyr: Update include paths for Zephyr v2.0. 2020-02-04 17:09:19 +11:00
main.c zephyr: Enable virtual file system and uos module. 2020-02-07 11:24:06 +11:00
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: Update include paths for Zephyr v2.0. 2020-02-04 17:09:19 +11:00
modmachine.h ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
moduos.c zephyr: Enable fatfs. 2020-02-07 11:24:06 +11:00
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: Implement block device protocol via zephyr disk access api. 2020-02-07 11:24:06 +11:00
modzephyr.h zephyr: Implement block device protocol via zephyr disk access api. 2020-02-07 11:24:06 +11:00
modzsensor.c zephyr: Update include paths for Zephyr v2.0. 2020-02-04 17:09:19 +11:00
mpconfigport.h zephyr: Enable fatfs. 2020-02-07 11:24:06 +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: Replace deprecated time conversion macro. 2020-02-04 17:09:59 +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_mimxrt1050_evk.conf zephyr: Implement block device protocol via zephyr disk access api. 2020-02-07 11:24:06 +11:00
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: Update include paths for Zephyr v2.0. 2020-02-04 17:09:19 +11:00
z_config.mk ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
zephyr_storage.c zephyr: Implement block device protocol via zephyr disk access api. 2020-02-07 11:24:06 +11:00

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