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intel64_timer_start_absolute() computed "expected - current_us" unsigned. A watchdog started with a delay of zero asks for a deadline that is already current, the subtraction wraps to nearly 2^64, and the comparator is set so far ahead that the timer never fires. The CONFIG_INTEL64_HPET_MIN_DELAY clamp in intel64_oneshot_start() cannot help: the wrapped value is enormous, not small. Ask for the shortest delay the hardware can take instead of wrapping, and let that existing minimum-delay logic pick it. It presents as ostest hanging in wdog_test with no output and no fault. apps/testing/ostest/wdog.c:281 calls wdtest_once(&test_wdog, param, 0), and NSEC2TICK() takes the next few delays (1ns, 10ns, ...) to zero ticks as well; wdtest_once() then spins forever in its "wait until the callback is triggered exactly once" loop. Impact: runtime, ARCH_INTEL64_HPET_ALARM only. Assisted-by: Claude:claude-opus-5 Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com> |
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| dummy | ||
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| pass1 | ||
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| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
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| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.