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The Interval field of an endpoint context is an exponent: the controller services the endpoint every 2^Interval microframes. An endpoint descriptor states its period differently depending on device speed, so the number cannot be copied across, which is what this did. A low speed keyboard asking to be polled every 10ms was programmed as 2^10 microframes, which the controller would not accept: Configure Endpoint went unanswered and allocation failed with -EIO. Low and full speed interrupt endpoints state a period in frames, so the exponent is the highest bit of that period in microframes, clamped to the range the specification allows. Other periodic endpoints already state an exponent, one greater than the one wanted here. Control and bulk endpoints are not periodic and the field means nothing to them. Assisted-by: Claude:claude-opus-5 Signed-off-by: Justin Hammond <justin@dynam.ac> |
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| 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.