RTOS

Unix and Linux config :: Containers :: Clusters :: <link>

2021-02-02 Tuesday

Real Time Operating System references . . .

^ ChibiOS

A brief history of ChibiOS development:

• http://forum.chibios.org/viewtopic.php?t=481

How to create static threads and dynamic threads, in ChibiOS:

• http://www.chibios.org/dokuwiki/doku.php?id=chibios:articles:howtos:createthread

How to choose thread's working area or memory size:

• http://forum.chibios.org/viewtopic.php?t=4177

^ ChibiOS ports

This section dedicated to references and notes on ChibiOS ports to processors outside of the immediate, STM32xxx families of parts.

• https://hackaday.io/project/3743-chibios-tinkering

Adding this Nordicsemi Devzone article link regarding ChibiOS port to nRF9160 System In Package:

• https://devzone.nordicsemi.com/f/nordic-q-a/42149/rtos-selection

^ Zephyr RTOS

Introduction to Zephyr and some guides . . .

• https://docs.zephyrproject.org/latest/introduction/index.html
• https://docs.zephyrproject.org/latest/guides/dts/index.html#dt-guide
• https://docs.zephyrproject.org/latest/guides/dts/intro.html

Example code . . .

• https://docs.zephyrproject.org/latest/samples/hello_world/README.html
• https://docs.zephyrproject.org/latest/samples/philosophers/README.html

A tutorial for setting up support and build environment for Zephyr, and for flashing and testing on yet undetermined targets:

• https://docs.zephyrproject.org/latest/getting_started/index.html

Zephyr demo supported boards

• https://docs.zephyrproject.org/latest/boards/index.html#boards

YAML data serialization language

• https://www.tutorialspoint.com/yaml/yaml_basics.htm

There appears to be an important high-level tool called west which Zephyr developers and community use. It's also mentioned as the build tool for one or more of Nordic Semiconductor's nRF9160 example projects. A link to the github west documentation is,

• https://docs.zephyrproject.org/latest/guides/west/basics.html

The west project top level Github URL:

• https://github.com/zephyrproject-rtos/west

^ To configure Zephyr SDK

2021-07-27 Tuesday While configuring Zephyr SDK for Linux command line builds having trouble with basic build after following Nordic Semi 'Getting Started' instructions. Meta-tool west complains "not able to find toolchain.":

ted@localhost:~/zephyrproject/zephyr$ west build -b nrf9160dk_nrf9160@1.0.0 ./samples/basic/blinky
-- west build: generating a build system
Including boilerplate (Zephyr base (cached)): /home/ted/zephyrproject/zephyr/cmake/app/boilerplate.cmake
-- Application: /home/ted/zephyrproject/zephyr/samples/basic/blinky
-- Zephyr version: 2.6.99 (/home/ted/zephyrproject/zephyr), build: zephyr-v2.6.0-1460-g17d2e9d084b2
-- Found west (found suitable version "0.11.0", minimum required is "0.7.1")
-- Board: nrf9160dk_nrf9160, Revision: 1.0.0 (Active: 0.14.0)
-- Cache files will be written to: /home/ted/.cache/zephyr
-- Using toolchain: zephyr 0.12.4 (/opt/zephyr-sdk-0.12.4)
-- Found dtc: /usr/bin/dtc (found suitable version "1.5.0", minimum required is "1.4.6")
-- Found toolchain: cross-compile (arm-unknown-linux-gnueabi-)
CMake Error at /home/ted/zephyrproject/zephyr/cmake/compiler/gcc/generic.cmake:8 (message):
  Zephyr was unable to find the toolchain.  Is the environment misconfigured?

  User-configuration:

  ZEPHYR_TOOLCHAIN_VARIANT: cross-compile

  Internal variables:

  CROSS_COMPILE: arm-unknown-linux-gnueabi-

  TOOLCHAIN_HOME:

Call Stack (most recent call first):
  /home/ted/zephyrproject/zephyr/cmake/generic_toolchain.cmake:42 (include)
  /home/ted/zephyrproject/zephyr/cmake/app/boilerplate.cmake:570 (include)
  /home/ted/zephyrproject/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:24 (include)
  /home/ted/zephyrproject/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:40 (include_boilerplate)
  CMakeLists.txt:4 (find_package)


-- Configuring incomplete, errors occurred!
FATAL ERROR: command exited with status 1: /usr/bin/cmake -DWEST_PYTHON=/usr/bin/python3 -B/home/ted/zephyrproject/zephyr/build -S/home/ted/zephyrproject/zephyr/samples/basic/blinky -GNinja

^ edit point

Questions:
(1) what is in this file: /home/ted/zephyrproject/zephyr/cmake/compiler/gcc/generic.cmake?
(2) where originates this string pattern: arm-unknown-linux-gnueabi ?

Answers: (2) the pattern 'arm-unknown-linux-gnueabi-' does not appear to original in ~/zephyrproject/zephyr:

ted@localhost:~/zephyrproject/zephyr$ grep -nr 'arm-unknown-linux-gnueabi-' ./*
./build/CMakeCache.txt:53:CROSS_COMPILE:PATH=arm-unknown-linux-gnueabi-

Unsure whether this is correct but we have these newly drafted environment variables set: ted@localhost:~/zephyrproject/zephyr$ set | grep ZEPHYR ZEPHYR_SDK_INSTALL_DIR=/opt ZEPHYR_TOOLCHAIN_VARIANT=zephyr

^ General RTOS Considerations

• https://resources.sw.siemens.com/en-US/white-paper-moving-from-an-rtos-to-linux?cmpid=13526

^ References

• https://wiki.makerdiary.com/nrf52840-m2-devkit/zephyr/setup/#Linux