The TMPDIR podcast

Zephyr - First Experiences

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  • backstory
    • working on a project using freeRTOS on STM32H743
    • a lot of work integrating things like Ethernet/USB
    • code generation has tradeoffs
    • without one week, 1 engineer working part-time had Zephyr running with most drivers working
    • Build
      • Kconfig (very granular)
      • Device Tree -> C headers
      • extensive use of Macros
      • no C++
      • differences between other RTOS models
        • most MCU tooling takes RTOS, and MCU integrates and delivers
        • Zephyr does the opposite – they take MCU HAL, and then integrate and deliver directly to developers
        • Support/Community
          • Discord
          • Github discussions
          • Shell
            • is amazing
            • proper terminal with tab completion, proper backspace support, etc
            • keeps what you are typing at bottom of screen even if there are logging messages
              • scrolling
            • list threads, memory used, %CPU, etc
            • Projects like Beagle Connect Freedom – they are piping shell over radio connection
            • Logging
              • standard levels ERR, WRN, INF, DBG
              • easy to add a logging domain in any module
              • Macros automatically apply LOG_WRN() to current logging domain
              • can change log level of each domain at runtime in shell
              • Tooling
                • well-integrated flashing
                • debugging uses the command line GDB
                • Linux connections
                • Performance
                • challenges
                  • configuration
                  • tracing code through system calls
                  • documentation is fairly good, but can be hard to find things
                  • opinion
                    • The Zephyr project is a sustainable approach as MCUs become more complex

                      • Discuss this episode at our

                      community site.

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                      The TMPDIR podcastBy TMPDIR
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