Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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Ansh Rai d0651aad54 lib/math32: Avoid __uint128_t casts for LDC ImportC
Building the hello_d example with LDC ImportC fails because ImportC
does not correctly handle direct __uint128_t C-style casts such as
(__uint128_t)a and (__uint128_t)1.

Replace the direct casts with equivalent typed temporaries, preserving
the existing behavior while allowing hello_d to build successfully with
LDC ImportC.

Verified on sim:nsh with CONFIG_EXAMPLES_HELLO_D=y:

  nsh> hello_d
  Hello World, [skylake]!
  DHelloWorld.HelloWorld: Hello, World!!

Signed-off-by: Ansh Rai <anshrai331@gmail.com>
2026-07-21 17:11:03 -03:00
.github Documentation: PBKDF2 login docs, board Kconfig, and CI password 2026-07-21 20:19:14 +08:00
arch arch/arm/src/stm32{h7,f7,l4}: add 4-bit wide bus support for MMC/eMMC cards 2026-07-21 08:51:38 -03:00
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 Documentation: PBKDF2 login docs, board Kconfig, and CI password 2026-07-21 20:19:14 +08:00
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 Documentation: PBKDF2 login docs, board Kconfig, and CI password 2026-07-21 20:19:14 +08:00
drivers drivers/spi/ice40: fix operator precedence in final clock cycle count 2026-07-20 17:05:01 +08:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs drivers/eeprom: I2C EEPROM Read/Write Kernel Operations Cause a Device Crash 2026-07-20 10:02:21 +02:00
graphics drivers/: Multiple Drivers Are Registered With World Writable - Part 2 2026-07-15 15:27:28 +08:00
include lib/math32: Avoid __uint128_t casts for LDC ImportC 2026-07-21 17:11:03 -03:00
libs spawn: allow zero stacksize/priority to use binary loader defaults 2026-07-15 12:24:44 -03:00
mm arch/mips: Add basic support for MIPS Creator CI20 board 2026-07-15 08:02:55 -03:00
net fix(net/igmp): restore General Query handling broken by pointer compare 2026-07-15 08:46:23 +02:00
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 !tools/mkpasswd: PBKDF2 host tool and ROMFS passwd build integration 2026-07-21 20:19:14 +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 !boards: Remove NSH_ARCHINIT and board_app_initialize 2026-05-02 18:36:46 +08:00
.codespellrc risc-v/gd32vw55x: add GigaDevice GD32VW553 port (Wi-Fi 6) 2026-07-16 10:03:16 -03:00
.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/nuttx_toolchain.cmake: track preprocessed include deps 2026-06-04 17:22:43 +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.