NuttX code samples for www.railab.me

To initialize the repository use this:

git clone https://github.com/railab/nuttx external/nuttx
git clone https://github.com/railab/nuttx-apps external/nuttx-apps
ln -sr apps external/nuttx-apps/external

Apache NuttX and small systems series

All tests for this series were done for Apache NuttX with the following commits:

• nuttx: 6d629b3b36105e34f97f0439af5acaa8543c78a7
• nuttx-apps: 0c467dc02d1f03f3f9f3defb16f36cb4f53b4c9d

Additionally some changes were cherry-picked to fix encountered issues. Ready to use branches can be found here:

• https://github.com/railab/nuttx/tree/small_systems_tests
• https://github.com/railab/nuttx-apps/tree/small_systems_tests

Hello, World !

Examples for www.railab.me/posts/2024/11/nuttx-and-small-systems-hello-world/

The common command to build examples is:

cmake -B build -S external/nuttx -DBOARD_CONFIG=../../boards/arm/stm32/nucleo-f302r8-mini/config/{CONFIG_NAME} -GNinja
cmake --build build

Where CONFIG_NAME for a given example are given below:

• mini_hello - minimal "Hello, world!":
• mini_hello_opt - minimal, optimized "Hello, world!":

NuttX Core

Examples for www.railab.me/posts/2024/12/nuttx-and-small-systems-core-os/

The common command to build examples is:

cmake -B build -S external/nuttx -DBOARD_CONFIG=../../boards/arm/stm32/nucleo-f302r8-mini/config/{CONFIG_NAME} -GNinja
cmake --build build

Where CONFIG_NAME for a given example are given below:

• mini_core1 - minimal NuttX image with serial port enabled:
• mini_core2 - minimal NuttX image with serial port disabled:
• mini_core3 - minimal NuttX image with serial port disabled and no /dev/null:
• mini_blinky1 - blinky with files:
• mini_blinky2 - blinky with arch-specific code:

NuttX Components

Examples for www.railab.me/posts/2025/1/nuttx-and-small-systems-os-components/

The common command to build examples is:

cmake -B build -S external/nuttx -DBOARD_CONFIG=../../boards/arm/stm32/nucleo-f302r8-mini/config/{CONFIG_NAME} -GNinja
cmake --build build

Where CONFIG_NAME for a given example are given below:

• Application 1 - DEFAULT_SMALL influence:
  • mini_components1 - base configuration
  • mini_components1_env - environment variable support enabled
  • mini_components1_tim - POSIX timers support enabled
  • mini_components1_pth - Pthreads support enabled
  • mini_components1_mq - POSIX message queue support enabled
  • mini_components1_mqsys - System V message queue support enabled
  • mini_components1_osall - enable all OS interfaces
  • mini_components1_fstream - FILE stream support enabled
• Application 2 - poll() and epoll():
  • mini_components2 - base configuration
  • mini_components2_busy - busy wait for timer
  • mini_components2_poll - poll wait for timer
  • mini_components2_epoll - epoll wait for timer
• Application 3 - thread data protection:
  • mini_components3 - base configuration
  • mini_components3_pth - threads only
  • mini_components3_atomic - thread data as atomic
  • mini_components3_mut - thread data protected with mutex
  • mini_components3_cond - thread data with condition variable
  • mini_components3_rwlock - thread data protected with rwlock
• Application 4 - signaling:
  • mini_components4 - base configuration
  • mini_components4_pth - notify main with thread and semaphore
  • mini_components4_tim - notify main with POSIX timer signal
  • mini_components4_tim_sigev - notify main with POSIX timer signal and SIGEV_THREAD
• Application 5 - printf and libm:
  • mini_components5 - base configuration
  • mini_components5_float_nofpu - printf with floating point support and FPU disabled
  • mini_components5_float_fpu - printf with floating point support and FPU enabled
  • mini_components5_long - printf with long long support
  • mini_components5_libm_nx_nofpu - libm from NuttX with FPU disabled
  • mini_components5_libm_nx_fpu - libm from NuttX with FPU enabled
  • mini_components5_libm_newlib_nofpu - libm from Newlib with FPU disabled
  • mini_components5_libm_newlib_fpu - libm from Newlib with FPU enabled
  • mini_components5_libm_fixedmath - fixed math test
  • mini_components5_libm_floatmath_nofpu - float math test with FPU disabled and NuttX libm
  • mini_components5_libm_floatmath_fpu - float math test with FPU enabled and NuttX libm

Mini CAN node

Examples for www.railab.me/posts/2025/2/nuttx-and-small-systems-can-node-example/

The common command to build examples for nucleo-f302r8-mini is:

cmake -B build -S external/nuttx -DBOARD_CONFIG=../../boards/arm/stm32/nucleo-f302r8-mini/config/{CONFIG_NAME} -GNinja
cmake --build build

Where CONFIG_NAME for a given example are given below:

• mini_cannode_char - CAN node example with CAN character device
• mini_cannode_sock - CAN node example with CAN SocketCAN interface

Mini Modbus slave

Example for www.railab.me/posts/2025/3/nuttx-and-small-systems-modbus-slave-example/

cmake -B build -S external/nuttx -DBOARD_CONFIG=../../boards/arm/stm32/nucleo-f302r8-mini/config/mini_modbusslave -GNinja cmake --build build

Host-Based Development with Apache NuttX

CAN Network Simulation

Examples for www.railab.me/posts/2025/5/host-based-dev-with-nuttx-can-network/

CAN node with CAN character device on Simulator:

cmake -B build_sim1 -S external/nuttx -DBOARD_CONFIG=../../boards/sim/sim/sim/configs/cannode_char -GNinja
cmake --build build_sim1

CAN node with CAN SocketCAN interface on Simulator:

cmake -B build_sim2 -S external/nuttx -DBOARD_CONFIG=../../boards/sim/sim/sim/configs/cannode_sock -GNinja
cmake --build build_sim2

CAN node with CAN character device on qemu-armv7a:

cmake -B build_arm1 -S external/nuttx -DBOARD_CONFIG=../../boards/arm/qemu/qemu-armv7a/configs/cannode_char -GNinja
cmake --build build_arm1

CAN node with CAN SocketCAN interface on qemu-armv7a:

cmake -B build_arm2 -S external/nuttx -DBOARD_CONFIG=../../boards/arm/qemu/qemu-armv7a/configs/cannode_sock -GNinja
cmake --build build_arm2

CAN-tools utils on qemu-intel64:

cmake -B build_x86 -S external/nuttx -DBOARD_CONFIG=../../boards/x86_64/intel64/qemu-intel64/configs/canutils -GNinja
cmake --build build_x86