Examples

Selecting Examples

The examples directory contains several sample applications that can be linked with NuttX. The specific example is selected in the boards/<arch-name>/<chip-name>/<board-name>/configs/<config>/defconfig file via the CONFIG_EXAMPLES_xyz setting where xyz is the name of the example. For example:

CONFIG_EXAMPLES_HELLO=y

Selects the examples/hello “Hello, World!” example.

Built-In Functions

Some of the examples may be built as built-in functions that can be executed at run time (rather than as NuttX main programs). These built-in examples can be also be executed from the NuttShell (NSH) command line. In order to configure these built-in NSH functions, you have to set up the following:

• CONFIG_NSH_BUILTIN_APPS – Enable support for external registered, named applications that can be executed from the NSH command line (see apps/README.md for more information).

Supported examples

Contents

• abntcodi ABNT CODI example
• adc Read from ADC
• adjtime Ajdtime function example
• adxl372_test ADXL372 test program
• ajoystick Analog Joystick
• alarm RTC Alarm
• apa102 Rainbow on APA102 LED Strip
• apds9960 APDS-9960 test application
• audio_rttl Audio tone generator
• bastest Bas BASIC Interpreter
• battery Battery monitor example
• bme680 BME680 sensor example
• bmi160 BMI160 sensor example
• bmp180 BMP180 Barometer sensor example
• bmp280 BMP280 Barometer sensor example
• bridge Network Bridge
• buttons Read GPIO Buttons
• calib_udelay Calibration tool for udelay
• camera Camera Snapshot
• can CAN Device Test
• capture PWM Capture example
• cbortest TinyCBOR Test Example
• cctype Verify C++ cctype operations
• chat AT over TTY
• chrono Chronometer example to use with STM32LDiscover
• configdata Config Data example / unit test
• cordic CORDIC driver example
• cpuhog Keep CPU Busy
• cromfs CROMFS Example
• dac Write to DAC
• dhcpd DHCP Server
• discover UDP Discover Daemon
• djoystick Discrete Joystick
• dronecan DroneCAN example
• elf ELF loader
• embedlog embedlog example
• esp32_himem ESP32 HIMEM Example
• etl Embedded Template Library (ETL) C++ example
• fb Framebuffer
• fboverlay Framebuffer overlay test tool
• flash_test SMART Flash test
• flowc Serial Hardware Flow Control
• fmsynth FM Synthesizer examples
• foc FOC motor controller example
• ft80x FT80x GUI Chip
• ftpc FTP Client
• ftpd FTP daemon
• fxos8700cq_test
• gpio GPIO Read and Write
• gps GPS example
• hall Hall effect sensor example
• hdc1008_demo HDC1008 driver example
• hello Hello World
• hello_nim Hello World in Nim
• hello_wasm Hello World in WASM
• hello_zig Hello World in Zig
• helloxx Hello World in C++
• hidkbd USB Host HID keyboard
• hts221_reader HTS221 Humidity Sensor
• i2cchar Transfer Through I2C
• i2sloop I2S loopback test
• igmp Trivial IGMP
• ina219 Current/Power Monitor INA219
• ina226 Current/Power Monitor INA226
• ini_dumper ini dumper example
• ipcfg IP Configuration file example
• ipforward IP Forwarding Using TUN
• json cJSON
• keyboard
• leds Toggle LEDs
• leds_rust Toggle LEDs in Rust
• leds_zig Toggle LEDs in Zig
• libtest Static Library Test
• lis3dsh_reader LIS3DSH Accelerometer
• lp503x LP503X PWM LED example
• lsm303_reader LSM303 Accelerometer/Magnetometer
• lsm6dsl_reader LSM6DSL Accelerometer/Gyroscope
• ltr308 LTR308 ambient light sensor example
• lua_module Hello World Lua module
• lvgldemo LVGL Demo
• lvglterm LVGL Terminal for NuttShell (NSH)
• max31855 max31855 example
• mcuboot MCUboot examples
• media Media test
• mld MLD example
• mlx90614 MLX90614 Test Example
• mml_parser MML parser example
• modbus FreeModbus demo example
• modbusmaster Modbus Master example
• module Loadable Module
• mount Mount Filesystem
• mqttc MQTT-C Example
• mtdpart MTD Partition Test
• mtdrwb MTD Read-ahead and Write Buffering
• netlink_route Netlink NETLINK_ROUTE test
• netloop Network loopback device
• netpkt AF_PACKET Raw Sockets
• nettest Client/Server Over TCP
• nimble NimBLE example
• nng_test NNG pubsub program
• noteprintf “Note printf!” example
• nrf24l01_btle Emulates a nRF8001 temperature beacon with nRF24L01
• nrf24l01_term NRF24L01 Wireless Connection
• null NULL example
• nunchuck
• nx NX graphics example
• nxdemo NX Demo “Graphic test” example
• nxflat NXFLAT Binary
• nxhello NX graphics “Hello, World!” example
• nximage Display NuttX Logo
• nxlines NX Line Drawing
• nxscope NxScope library example
• nxterm Display NuttShell (NSH) as NX Console
• nxtext Display NX Text
• obd2 OBD-II application example
• oneshot Oneshot Timer
• opencyphal OpenCyphal Cyphal/CAN example
• pca9635 PCA9635PW LED
• pdcurses pdcurses demos
• pf_ieee802154 PF_IEEE802154 example
• pipe Pipe example
• poll Poll example
• popen popen() example
• posix_spawn posix_spawn Unit Test
• powerled Powerled driver example
• powermonitor LTC4151 powermonitor example
• pppd pppd client example
• pty_test Pseudo-Terminals
• pwfb NX Per-Window Framebuffer Text Example
• pwlines NX Per-Window Framebuffer Graphics Example
• pwm General PWM Example
• qencoder Quadrature Encoder
• random Random Numbers
• relays Relays
• rfid_readuid RFID example
• rgbled RGB LED Using PWM
• romfs File System
• rpmsgsocket Rpmsg socket example
• Rust Examples
• sendmail SMTP Client
• serialblaster Serial Blaster example
• serialrx Serial RX example
• serloop Serial Loopback
• shm_test SHM example
• sht3x SHT3x sensor example
• slcd Alphanumeric Segment LCD
• smps Switched-Mode Power Supply
• sotest Shared Library Module Test
• spislv SPI slave example
• stat Test of stat(), fstat(), and statfs()
• sx127x_demo SX127X Radio
• system System() example
• tcp_ipc_client Client for TCP IPC NuttX
• tcp_ipc_server Server for TCP IPC NuttX
• tcpblaster TCP Performance Test
• tcpecho TCP Echo Server
• telnetd Simple Telnet Shell
• termios Simple Termios interface test
• thttpd THTTPD server
• tiff TIFF file generation example
• timer Timer example
• timer_gpio Timer GPIO example
• touchscreen Touchscreen Events
• udgram Unix domain datagram example
• udp Client/Server Over UDP
• udpblaster UDP blaster example
• uid UID/GID example
• unionfs Union File System
• usbserial USB Serial Hello World
• userfs UserFS File System
• usrsocktest USRSOCK test example
• ustream Unix Stream Sockets
• veml6070 VEML6070 UltraViolet sensor example
• watchdog Watchdog Timer
• watcher Watcher & Watched
• webserver Simple Webserver
• wget Web Client
• wgetjson GET JSON Using wget
• wiegand Wiegand example
• ws2812 ws2812 Demo
• ws2812esp32rmt ws2812 Demo using ESP32_RMT
• xbc_test XBox Controller Example
• xedge_demo a lightweight Lua-based web framework for building secure, real-time IoT applications
• Further Reading
• xmlrpc XML-RPC Server
• zerocross Zero Crossing Device