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@memfault-bot memfault-bot released this 01 Aug 23:59
1.28.0
60e9ab9

This is a minor update release. Highlights:

  • added a new test command for simulating hangs in ISRs
  • improved NMI exception capture
  • fixed a build issue in the nRF-Connect SDK port

📈 Added

  • Zephyr:

    • Add a new test command, mflt test isr_hang, which will cause a busy loop
      hang inside a k_timer, which normally is executing from an ISR context.
      The system will only exit this condition if there is a watchdog or other
      higher-priority interrupt capable of preempting the k_timer ISR. The
      qemu sample app is updated to enable a watchdog
      which generates an NMI exception, caught by Memfault.

    • Added a debug print when uploading data using
      CONFIG_MEMFAULT_HTTP_PERIODIC_UPLOAD that shows the bytes sent:

      [00:09:45.821,000] <dbg> mflt: memfault_platform_log: Uploaded 118 bytes of Memfault data

      Only enabled when debug level prints are enabled for Memfault
      (CONFIG_MEMFAULT_LOG_LEVEL_DBG=y).

🛠️ Changed

  • Zephyr:

    • NMI exceptions are now properly handled. Prior to this change, a coredump
      was captured on NMI exceptions but the MSP context was not fully unwound and
      the NVIC state was not included in the trace data.

    • Add a new Kconfig option,
      CONFIG_MEMFAULT_COREDUMP_NVIC_INTERRUPTS_TO_COLLECT, which controls the
      existing memfault_platform_config.h setting
      MEMFAULT_NVIC_INTERRUPTS_TO_COLLECT for Cortex-M targets. The default now
      is to collect all NUM_IRQS as defined by Zephyr, which on many platforms
      will increase from the previous default of 32. This improves the
      out-of-the-box information at the cost of 44 bytes in coredump storage
      consumed per additional 32 interrupts. Some example deltas shown below,
      including the byte delta in the stored coredump:

      Platform Previous Default New Default Byte Delta
      nRF52840 32 64 (*48, rounded up to nearest multiple of 32) +44
      nRF91 32 96 (*65 rounded up) +88
      nRF53 32 96 (*69 rounded up) +88
      STM32F407 32 96 (*82 rounded up) +88
      STM32H7B0 32 160 (*155 rounded up) +176
      STM32H563 32 160 (*155 rounded up) +176

      To restore the previous default, set
      CONFIG_MEMFAULT_COREDUMP_NVIC_INTERRUPTS_TO_COLLECT=32.

  • nRF-Connect SDK:

    • Fix a build issue impacting some nRF54 series chips related to reboot reason
      decoding. Thanks to @grochu for providing the
      fix in #94 🎉!
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