Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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Bowen Wang 3237e25d70 drivers/virtio: use virtqueue_nused() to check pending buffers
Replace direct virtqueue internal field access with virtqueue_nused()
API to check for pending buffers in interrupt handlers. This improves
code maintainability and handles cached memory scenarios correctly.

Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>
2026-01-31 14:14:25 +08:00
.github sched: Remove legacy sched_resumescheduler.c 2026-01-27 18:21:12 +08:00
arch arch/esp32s3/spi: make sure spi don't send wrong bytes when dma is enabled 2026-01-31 02:50:52 +08:00
audio fs/file: unify prefix about file_xxx api, like file_open, file_ioctl 2025-06-12 18:12:42 +08:00
binfmt sched/task: move kernel stack allocation to task initialization 2026-01-18 23:05:11 +08:00
boards boards/xtensa/esp32: remove alignments for simpleboot 2026-01-30 11:18:02 -03:00
cmake cmake(bugfix):change default compile obj extension to .o 2026-01-27 20:54:26 +08:00
crypto crypto/cryptosoft: Fix HMAC-SHA when a long key is used 2026-01-28 13:14:05 -03:00
Documentation Documentation/rpmsg: add rpmsg dump documentation 2026-01-30 07:50:11 -03:00
drivers drivers/virtio: use virtqueue_nused() to check pending buffers 2026-01-31 14:14:25 +08:00
dummy
fs fs/9pfs: use virtio_read_config_bytes() to read the tag in config space 2026-01-30 08:11:57 -03:00
graphics graphics/nxterm: Use small lock to protect resource in graphics. 2026-01-27 17:59:07 +08:00
include forward: Add IFF_NOSRC_FORWARD and IFF_NODST_FORWARD flags. 2026-01-31 02:37:58 +08:00
libs libc/tls: update preprocessor condition comment to match implementation 2026-01-31 02:49:10 +08:00
mm mm/tlfs: Account initial size of struct mm_heap_s 2026-01-27 21:27:53 +08:00
net forward: Add IFF_NOSRC_FORWARD and IFF_NODST_FORWARD flags. 2026-01-31 02:37:58 +08:00
openamp lib/rpmsg: add priority support for rpmsg endpoint 2026-01-30 07:50:11 -03:00
pass1 Revert "build depend:Revert Make.dep intermediate ddc file" 2024-09-15 19:29:47 +08:00
sched sched_sysinfo.c: coverity HIS_metric_violation: RETURN 2026-01-31 02:53:58 +08:00
syscall syscall: add sched_note_event_ip syscall for instrumentation dump 2026-01-28 02:06:23 +08:00
tools abi_check.py:Check ABI compatibility between different ELF versions. 2026-01-28 18:32:39 +01:00
video Revert "build depend:Revert Make.dep intermediate ddc file" 2024-09-15 19:29:47 +08:00
wireless net/wireless: fix compile warning 2025-12-25 18:05:33 +08:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines net/icmpv6: replace net_lock with conn_lock and conn_lock_dev 2025-12-29 09:42:18 +08:00
.codespellrc codespellrc: add ist to ignorelist 2025-10-14 17:42:01 +08:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore gitignore: add more vim swap files 2025-06-18 15:44:51 -04:00
.gitmessage docs/contributing: Add a commit message template 2025-06-03 17:33:24 +08:00
.pre-commit-config.yaml pre-commit: enable codespell checks 2025-05-05 12:34:39 +08:00
.yamllint
AUTHORS AUTHORS: add Michal Lenc 2025-12-03 08:46:33 -03:00
CMakeLists.txt cmake(bugfix):change default compile obj extension to .o 2026-01-27 20:54:26 +08:00
CONTRIBUTING.md style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
INVIOLABLES.md
Kconfig Kconfig: Add ALLOW_CUSTOM_PERMISSIVE_COMPONENTS option 2026-01-20 02:15:19 +08:00
LICENSE style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
Makefile tools: migrate to SPDX identifier 2024-09-10 23:11:11 +08:00
NOTICE
README.md Gathering community recommendations 2023-10-28 13:55:56 +08:00
ReleaseNotes

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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.