ce0038f2bc
Every DWC2-derived USB device driver enables USBSUSP in GINTMSK but not WKUP, and every one of them ANDs GINTSTS with GINTMSK before dispatch. The resume handler is therefore unreachable: CLASS_SUSPEND is delivered on suspend, CLASS_RESUME never is. For CDC/ACM that is fatal. cdcacm_suspend() calls uart_connected(false), after which serial.c refuses every open() and write() with -ENOTCONN, and the cdcacm_resume() that would clear it never runs. On a Linux host with the default USB autosuspend (power/control=auto, 2000 ms) simply closing the tty is enough to trip it, and the port stays dead for the rest of the boot while the device remains enumerated. Verified on STM32H7 (ARK FMU v6X): before, one host suspend leaves the CDC/ACM port permanently -ENOTCONN; after, ten forced suspend/resume cycles all recover with the MAVLink stream intact. The remaining drivers carry a line-for-line copy of the same initialisation. Assisted-by: Claude:claude-fable-5 Signed-off-by: Jacob Dahl <dahl.jakejacob@gmail.com> |
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| 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.