Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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Jorge Guzman e33a1f9943 risc-v/gd32vw55x: add pwm example to gd32vw553k-start
Add a "pwm" configuration that exercises the PWM driver on TIMER1. It is the
nsh base plus the PWM driver, registered as /dev/pwm0 and driven by the pwm
example (100 Hz, 50 % duty by default).

TIMER1 channel 0 is routed to PA0 on the J1 header (AF1) so the waveform can
be probed there; the other channels stay unrouted.

Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>
2026-07-26 13:24:12 +02:00
.github Documentation: PBKDF2 login docs, board Kconfig, and CI password 2026-07-21 20:19:14 +08:00
arch risc-v/gd32vw55x: fix I2C master and add gd32vw553k-start sht3x example 2026-07-26 13:24:12 +02:00
audio drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
binfmt elf:use elf symbol to parse attribute 2026-07-15 12:24:44 -03:00
boards risc-v/gd32vw55x: add pwm example to gd32vw553k-start 2026-07-26 13:24:12 +02:00
cmake !tools/mkpasswd: PBKDF2 host tool and ROMFS passwd build integration 2026-07-21 20:19:14 +08:00
crypto crypto: add CRYPTO_AES_CTR_SSH variant (128-bit big-endian counter) 2026-07-16 15:42:10 +08:00
Documentation risc-v/gd32vw55x: add pwm example to gd32vw553k-start 2026-07-26 13:24:12 +02:00
drivers drivers/sensors: add LIS3DSH accelerometer uORB driver 2026-07-25 14:45:40 +02:00
dummy
fs fs/vfs: Add ioctldir for volume ioctls via the mountpoint directory. 2026-07-25 07:28:22 -03:00
graphics drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
include drivers/sensors: add LIS3DSH accelerometer uORB driver 2026-07-25 14:45:40 +02:00
libs libc/time: Fix POSIX timezone string parsing. 2026-07-25 19:54:18 +08:00
mm arch/mips: Add basic support for MIPS Creator CI20 board 2026-07-15 08:02:55 -03:00
net arch/sim: Add AF_LOCAL support to host usrsock 2026-07-23 15:34:02 +08:00
openamp openamp: fix CMake dcache option 2026-05-10 15:03:24 +02:00
pass1 Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
sched sched/backtrace: fix cross-CPU buffer access under addrenv 2026-07-20 21:01:28 -03:00
syscall syscall: fcntl param3 type to uintptr_t 2026-04-27 12:01:55 -03:00
tools build(deps): bump pillow from 12.2.0 to 12.3.0 in /tools/pynuttx 2026-07-22 11:35:43 +08:00
video video: fix EDID standard timing decode 2026-07-17 15:00:50 -03:00
wireless drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines arch/arm: Reserve r10 via ARCHCFLAGS and hoist the PIC module flags. 2026-07-24 23:09:08 +08:00
.codespellrc arch/arm/rp23xx: Add hardware TRNG driver for /dev/random. 2026-07-25 15:06:56 +08:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore git: Specify multiple build directories in .gitignore. 2026-05-20 03:06:58 +08:00
.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 Eren Terzioglu 2026-05-20 15:17:00 +08:00
CMakeLists.txt cmake: Do not link an executable to detect the compiler. 2026-07-25 22:52:39 +08:00
CONTRIBUTING.md contributing: Add requirement for 'Assisted-by' commit field 2026-07-12 09:42:28 +08:00
INVIOLABLES.md
Kconfig sched/misc/assert: Add CONFIG_SCHED_DUMP_TASKS and CONFIG_SCHED_DUMP_STACK 2026-06-09 08:04:54 -04:00
LICENSE libs/libdsp: Add Matrix operations 2026-07-11 14:55:59 -03:00
Makefile !boards: enforce secure ROMFS passwd and TEA key setup 2026-07-09 22:41:11 +08:00
NOTICE
README.md ci/testing: Add MemBrowse Integration 2026-06-18 12:07:41 -03:00
ReleaseNotes Documentation: move ReleaseNotes 2023-09-26 20:41:00 +08:00

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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.