Subsystems

These samples demonstrate how to use various subsystems supported by Zephyr.

• Arm SiP Services on Intel Agilex SoC FPGAUse the SiP SVC subsystem to interact with the Secure Device Manager on Intel Agilex SoC FPGA.
• CMSIS-DAPImplement a custom CMSIS-DAP controller using SWDP interface driver.
• Demand pagingLeverage demand paging to deal with code bigger than available RAM.
• EDAC shellTest error detection and correction (EDAC) using shell commands.
• Non-Volatile Storage (NVS)Store and retrieve data from flash using the NVS API.
• Settings APILoad and save configuration values using the settings API.
• Task watchdogMonitor a thread using a task watchdog.
• TracingSend tracing formatted packet to the host with supported backends.
• UUIDManipulate UUID v4 and v5 compliant with IETF RFC 9562.

Binary Descriptor

• Binary descriptors "Hello World"Set and access binary descriptors for a basic Zephyr application.
• Binary descriptors readDefine some binary descriptors and read them.

Controller Area Network (CAN) Bus

• ISO-TP libraryUse ISO-TP library to exchange messages between two boards.

Console

• Console echoEcho an input character back to the output using the Console API.
• console_getchar()Use console_getchar() to read an input character from the console.
• console_getline()Use console_getline() to read an input line from the console.

Debug

• Debug MonitorConfigure the Debug Monitor feature on a Cortex-M processor.
• FuzzingIntegrate fuzz testing with Zephyr apps.

Display

• Character frame bufferDisplay character strings using the Character Frame Buffer (CFB).
• Character Framebuffer shell moduleUse the CFB shell module to interact with a monochrome display.
• Custom fontsGenerate and use a custom font.
• LVGL basic sampleDisplay a "Hello World" and react to user input using LVGL.

File Systems

• Fatfs filesystem fstabDefine fatfs filesystems in the devicetree.
• File system manipulationUse file system API with various filesystems and storage devices.
• Format filesystemFormat different storage devices for different file systems.
• LittleFS filesystemUse file system API over LittleFS.
• Zephyr Memory Storage (ZMS)Store and retrieve data from storage using the ZMS API.

Input

• Draw touch eventsVisualize touch events on a display.
• Input dumpPrint all input events.

Inter-Processor Communication (IPC)

• IPC service: icmsg backendSend messages between two cores using the IPC service and icmsg backend.
• IPC service: Multi-endpointUse the IPC Service with multiple endpoints.
• IPC service: static vrings backendSend messages between two cores using the IPC service and static vrings backend.
• OpenAMPSend messages between two cores using OpenAMP.
• OpenAMP using resource tableSend messages between two cores using OpenAMP and a resource table.
• RPMsg serviceSend messages between cores using RPMsg service.

Linkable Loadable Extensions (LLEXT)

• Linkable loadable extensions "module" sampleCall a function in a loadable extension module, either built-in or loaded at runtime.
• Linkable loadable extensions EDKEnable linkable loadable extension development outside the Zephyr tree using LLEXT EDK (Extension Development Kit).
• Linkable loadable extensions shell moduleManage loadable extensions using shell commands.

Logging

• Bluetooth logging backendSend log messages over Bluetooth using the Bluetooth logging backend.
• Dictionary-based loggingOutput binary log data using the dictionary-based logging API.
• LoggingOutput log messages to the console using the logging subsystem.

LoRaWAN

• LoRaWAN class A deviceJoin a LoRaWAN network and send a message periodically.
• LoRaWAN FUOTAPerform a LoRaWAN firmware-upgrade over the air (FUOTA) operation.

Management

• Eclipse hawkBit Direct Device Integration APIUpdate a device using Eclipse hawkBit DDI API.
• SMP serverImplement a Simple Management Protocol (SMP) server.
• UpdateHub embedded Firmware Over-The-Air (FOTA) updatePerform Firmware Over-The-Air (FOTA) updates using UpdateHub.

Modbus

• Modbus RTU clientCommunicate with a Modbus RTU server.
• Modbus RTU serverImplement a Modbus RTU server exposing Modbus commands to control LEDs.
• Modbus TCP serverImplement a Modbus TCP server exposing Modbus commands to control LEDs.
• Modbus TCP-to-serial gatewayImplement a gateway between an Ethernet TCP-IP network and a Modbus serial line.

Portability

• Dining Philosophers (CMSIS RTOS V1 APIs)Implement a solution to the Dining Philosophers problem using CMSIS RTOS V1.
• Dining Philosophers (CMSIS RTOS V2 APIs)Implement a solution to the Dining Philosophers problem using CMSIS RTOS V2.
• Synchronization using CMSIS RTOS V1 APIsUse timers and message queues from CMSIS RTOS v1 API to synchronize threads.
• Synchronization using CMSIS RTOS V2 APIsUse timers and message queues from CMSIS RTOS v2 API to synchronize threads.

Profiling

• Perf toolSend perf samples to the host with console support

Real Time I/O (RTIO)

• Sensor batch processingImplement a sensor device using RTIO for asynchronous data processing.

Sensing

• Sensing subsystemGet high-level sensor data in defined intervals.

Shell

• Custom Shell moduleRegister shell commands using the Shell API
• File system shellAccess a LittleFS file system partition in flash using the file system shell.

State Machine Framework

• Hierarchical State Machine Demo based on example from PSiCC2Implement an event-driven hierarchical state machine using State Machine Framework (SMF).
• SMF CalculatorCreate a simple desk calculator using the State Machine Framework.

Test suites

• Pytest shell application testingExecute pytest tests against the Zephyr shell.

USB device support

• Console over USB CDC ACMOutput "Hello World!" to the console over USB CDC ACM.
• Console over USB CDC ACMOutput "Hello World!" to the console over USB CDC ACM.
• USB Audio asynchronous explicit feedback sampleUSB Audio 2 explicit feedback sample playing audio on I2S.
• USB Audio asynchronous implicit feedback sampleUSB Audio 2 implicit feedback sample playing stereo and recording mono audio on I2S interface.
• USB Audio headsetImplement a USB Audio headset device with audio IN/OUT loopback.
• USB Audio microphone & headphonesImplement a USB Audio microphone + headphones device with audio IN/OUT loopback.
• USB CDC-ACMUse USB CDC-ACM driver to implement a serial port echo.
• USB DFUImplement a basic USB DFU device
• USB DFU (Device Firmware Upgrade)Implement device firmware upgrade using the USB DFU class driver.
• USB HID keyboardImplement a basic HID keyboard device.
• USB HID mouseImplement a basic HID mouse device.
• USB Mass StorageExpose board's RAM or FLASH as a USB disk using USB Mass Storage driver.
• USB MIDI2 deviceImplements a simple USB MIDI loopback and keyboard device.
• USB shellUse shell commands to interact with USB device stack.
• USB testing applicationTest USB device drivers using a loopback function.
• WebUSBReceive and echo data from a web page using WebUSB API.
• WebUSB-nextReceive and echo data from a web page using WebUSB API.

USB-C device support

• Basic USB-C SinkImplement a USB-C Power Delivery application in the form of a USB-C Sink.
• Basic USB-C SourceImplement a USB-C Power Delivery application in the form of a USB-C Source.

zbus

• BenchmarkingMeasure the time for sending 256KB from a producer to N consumers.
• Confirmed channelUse confirmed zbus channels to ensure all subscribers consume a message.
• Dynamic channelUse zbus channels with dynamically allocated messages.
• Message subscriberUse zbus message subscribers to listen to messages published to channels.
• Remote mock samplePublish to a zbus instance using UART as a bridge.
• Runtime observer registrationUse zbus' runtime observer registration to filter data generated by a producer.
• UART bridgeRedirect channel events to the host over UART.
• Work queueUse a work queue to process zbus messages in various ways.
• zbus Hello WorldMake three threads talk to each other using zbus.
• zbus Priority BoostIllustrates zbus priority boost feature with a priority inversion scenario.