Embedded Library Entry

Overview

Use this skill as the entry point for MCU library integration work. Classify the library type, target platform, runtime model, resource limits, and required porting layer before routing to a specific library skill.

When To Use

Use this skill when:

• The user wants to add, port, configure, or debug an embedded C library.
• The task involves MCU storage, logging, crash diagnosis, shell commands, filesystems, protocol stacks, UI, parsers, buttons, timers, queues, or state machines.
• The target may be bare metal, RTOS-based, or resource-constrained.

Do not use this skill when the problem is only board bring-up, flashing, serial logs, or architecture faults. Use the embedded debug skills first.

First Questions

Ask only what is needed to route:

• Library name and version or source repository.
• Target MCU/SoC, compiler, and build system.
• Runtime model: bare metal, FreeRTOS, RT-Thread, Zephyr, Linux, or unknown.
• Memory/storage resources: RAM, flash, block device, filesystem, heap, stack, and whether dynamic allocation is allowed.
• Existing porting layer: file I/O, flash driver, UART, timebase, mutex, malloc, display, network, or shell transport.
• Current task: first integration, compile error, link error, runtime failure, performance issue, or data corruption.

Routing Guide

Storage & Filesystem

Library or task	Prefer
littlefs filesystem or block device	littlefs-integration
FatFs disk I/O, FAT/exFAT	fatfs-integration
FlashDB KV/time-series database	flashdb-integration

Logging & Diagnosis

Library or task	Prefer
EasyLogger output, filters, async logs	easylogger-integration
CmBacktrace Cortex-M crash backtrace	cmbacktrace-integration
SEGGER RTT logs, control block, J-Link I/O	segger-rtt-integration

Shell & CLI

Library or task	Prefer
letter-shell command shell	letter-shell-integration
nr_micro_shell tiny CLI	nr-micro-shell-integration
zoom-shell embedded console	zoom-shell-integration

Networking & Protocols

Library or task	Prefer
lwIP netif, DHCP, TCP, UDP	lwip-integration
FreeRTOS+TCP network driver, sockets	freertos-plus-tcp-integration
MQTT client, keepalive, QoS, TLS	mqtt-embedded-integration
FreeModbus RTU, ASCII, TCP	freemodbus-integration
OpenThread radio, mesh, commissioning	openthread-integration
CAN bus library, MCP2515, bit timing	canbus-integration
CANopen OD, NMT, SDO, PDO, heartbeat	canopen-integration
BLE GATT services, characteristics, MTU	ble-gatt-integration

UI & Display

Library or task	Prefer
LVGL display, input, tick, draw buffers	lvgl-integration
U8g2 monochrome display, fonts	u8g2-integration
E-paper EPD, busy timing, refresh modes	epd-integration
TJpgDec embedded JPEG decoding	tjpgd-integration

Security & Crypto

Library or task	Prefer
mbedTLS entropy, certificates, TLS handshake	mbedtls-integration
micro-ecc ECDH, ECDSA, keys, signatures	micro-ecc-integration
TinyCrypt AES, SHA, HMAC, ECC	tinycrypt-integration

Data & Serialization

Library or task	Prefer
cJSON, jsmn, inih parsers	embedded-data-parsing-libs
nanopb Protocol Buffers	nanopb-integration
CRC, checksum, integrity checks	crc-checksum-integration

USB & Transfer

Library or task	Prefer
TinyUSB device, host, CDC, MSC, HID	tinyusb-integration
XMODEM/YMODEM serial transfer, bootloader	ymodem-xmodem-integration

Boot & OTA

Library or task	Prefer
MCUboot secure boot, slots, signing	mcuboot-integration
OTA package, transport, rollback	ota-update-integration

Compression

Library or task	Prefer
miniz DEFLATE, zlib, ZIP	miniz-integration
heatshrink streaming compression	heatshrink-integration

DSP & ML

Library or task	Prefer
CMSIS-DSP math, FFT, filters	cmsis-dsp-integration
TinyMaix MCU inference, model loading	tinymaix-integration

Input, Timers & State Machines

Library or task	Prefer
MultiButton, FlexibleButton	embedded-input-libs
MultiTimer, software timers	embedded-timing-libs
Ring buffer, FIFO, MCU queues	embedded-buffer-queue-libs
State machine libraries	embedded-state-machine-libs

Frameworks & Patterns

Library or task	Prefer
PLOOC object-oriented C	plooc-integration
Avem event-driven components	avem-integration
Power management framework	power-management-integration
Embedded app examples adaptation	embedded-app-example-libs

Testing

Library or task	Prefer
Unity, Ceedling, CMock embedded C tests	unity-ceedling-integration

Fallback (not a library issue)

Symptom	Prefer
MCU flash, erase, verify failure	mcu-flashing-debug
UART transport or missing logs	embedded-serial-log-debug
RTOS task, mutex, queue, stack issue	rtos-debug
Board power, reset, pin, or signal issue	hardware-interface-debug

Workflow

1. Route by library responsibility. Identify whether the library depends on storage, UART, RTOS primitives, heap, timers, display, network, or flash erase/program operations.

2. Confirm platform contracts. Ask for the porting hooks the library expects and the project already provides.

3. Preserve data and flash. Formatting filesystems, erasing database partitions, wiping logs, or changing flash layout requires explicit user approval.

4. Keep integration minimal. Bring up one smallest working path before enabling optional features such as async logging, wear leveling stress tests, shell authentication, or compression.

5. Verify with a target-relevant scenario. A library compiles successfully only proves syntax. Require a read/write, log, shell command, or crash capture that exercises the port layer.

Verification

Before moving to a specific library workflow:

• State the selected library skill and why.
• State target MCU/RTOS/compiler/build system if known.
• Identify required porting hooks and missing inputs.
• Confirm no data-destructive action has been recommended without approval.

Common Failures

• Treating a library as portable because it compiles on desktop.
• Enabling all optional features before the minimal port works.
• Ignoring flash erase size, write alignment, and power-fail behavior.
• Debugging library logic before validating the porting layer.
• Assuming malloc, mutexes, time functions, or file APIs exist on bare metal.

Example

User:

我想在 STM32 项目里加 littlefs 保存配置。

Agent:

1. Routes to littlefs-integration.
2. Asks for flash layout, erase/program sizes, bad block assumptions, RTOS locking, and whether formatting is allowed.
3. Verifies mount, format-if-approved, file write, sync, reboot, and readback.