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The USB device controller drivers invoke CLASS_DISCONNECT() on every USB bus reset, and a bus reset is the first step of normal host enumeration. Every other class driver (cdcacm, usbmsc, rndis) re-asserts DEV_CONNECT() at the end of its disconnect() handler so that the device remains attached; cdcecm and cdcncm did not, so on controllers that soft-disconnect around bus reset (e.g. rp2040, which drops the pull-up in its bus-reset handler) a standalone CDC-ECM or CDC-NCM device is left soft-disconnected by the first bus reset and never enumerates on the host. Mirror the cdcacm behavior and perform the soft connect in the disconnect() methods, unless part of a composite device (composite.c already re-connects in its own disconnect handler). Fixes the standalone CDC-ECM case of issue #15880. Validated on raspberrypi-pico (RP2040): with this change a standalone CONFIG_NET_CDCECM device that previously never appeared on the host enumerates via cdc_ether and pings with 0% loss. cdcncm has the identical defect and receives the identical fix. Signed-off-by: Ricard Rosson <ricard@groundbits.com> Co-authored-by: Xiang Xiao <xiaoxiang781216@gmail.com> Assisted-by: Claude (Anthropic Claude Code) |
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| dummy | ||
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| net | ||
| openamp | ||
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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.