Specialized

Skill beriberikix/zephyr-agent-skills/skills/specialized

A complete catalog of Agent Skills (agentskills.io) for Zephyr RTOS development.

Install

npx -y skills add beriberikix/zephyr-agent-skills --skill specialized

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What its author says it does

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Specialized hardware interfaces and system reliability for Zephyr RTOS. Covers LVGL GUI development, Audio I2S/Codecs, Watchdog timers, and Fault Injection. Trigger when building human-machine interfaces (HMI), audio devices, or high-reliability mission-critical systems.

SKILL.md

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Zephyr Specialized Hardware & Reliability

Integrate complex peripherals and build resilient systems that recover gracefully from unexpected failures.

Core Workflows

1. LVGL GUI Development

Build sophisticated graphical user interfaces for LCD and TFT displays.

Reference: lvgl_gui.md
Key Tools: Widgets, Styles, Double Buffering, native_sim simulator.

2. Audio I2S & Codecs

Implement high-quality digital audio streaming and codec management.

Reference: audio_i2s.md
Key Tools: CONFIG_I2S, DMA streaming, Ping-pong buffering.

3. Watchdog & Reliability

Ensure your system never hangs in the field using hardware watchdog timers.

Reference: watchdog_reliability.md
Key Tools: wdt_feed(), Windowed watchdog, Health checks.

4. Fault Injection & Resilience

Test your system's ability to recover from unexpected software and hardware errors.

Reference: fault_injection.md
Key Tools: Chaos testing, k_oops(), Reset reason diagnostics.

Quick Start (Watchdog Feed)

# Enable watchdog support
CONFIG_WATCHDOG=y

// Feed the dog in your main loop
while (1) {
    // Perform application work
    wdt_feed(wdt_dev, wdt_channel);
    k_sleep(K_MSEC(1000));
}

Professional Patterns (Reliability & UX)

Safe Boot Animation: Use a simple, non-interactive LVGL screen to show system status while critical subsystems (e.g., cloud connectivity) are initializing.
Zero-Pop Audio: Always use volume ramping when starting or stopping I2S streams to protect hardware and improve user experience.
Bitmask Health Monitoring: Use a bitmask to track the health of all background threads; the watchdog monitor only feeds the timer if ALL bits are set periodically.

Automation Tools

watchdog_window_check.py: Verify feed interval timing against watchdog window constraints.

Examples & Templates

watchdog_health_map_template.h: Starter health-bit definitions for watchdog supervision.

Validation Checklist

GUI render loop maintains target frame behavior without starving control tasks.
I2S audio stream starts/stops without underruns or audible artifacts.
Watchdog feed policy resets the system when health criteria are not met.
Fault-injection scenarios produce expected reset reason and recovery behavior.

Resources

References:
- lvgl_gui.md: GUI widgets and performance tuning.
- audio_i2s.md: Audio streaming and DMA patterns.
- watchdog_reliability.md: Watchdog setup and health checks.
- fault_injection.md: System resilience and chaos testing.
Scripts:
- watchdog_window_check.py: Feed-window timing checker.
Assets:
- watchdog_health_map_template.h: Health-mask template header.