a25fbba5a5
Add a NuttX watchdog lower-half for the Ameba KM4 non-secure system watchdog (WDG2), registered as /dev/watchdog0. The fwlib WDG API is ROM-resident, so no board.mk change is needed. The hardware cannot be stopped once enabled, so stop() is emulated via the early interrupt (EI) auto-refreshing the counter, and capture() delivers a pre-timeout callback through the same EI. The EI has a three-part timing contract, all handled here: it must be armed with EIMOD=ENABLE at WDG_Init, its EIE gate only takes effect after WDG_Enable, and -- because the EI is level-based -- a pure capture path must mask EIE after the one-shot callback to avoid re-entrant storming while the reset is pending. The EI flag is cleared twice per the slow WDG clock. Per-chip base address and IRQ live in ameba_wdg_chip.h so the shared driver needs no change to port to another Ameba IC. Verified on pke8721daf: timeout reset (BOOT REASON WDG2), stop() suppressing the reset, and capture() firing ~EICNT ms before the reset. Assisted-by: Claude <noreply@anthropic.com> Signed-off-by: dechao_gong <dechao_gong@realsil.com.cn> |
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| .github | ||
| arch | ||
| audio | ||
| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
| .codespellrc | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| 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.