name: kernel-basics description: Essential Zephyr RTOS kernel services. Covers thread lifecycle and priority, the logging subsystem for diagnostics, and the interactive shell for real-time hardware inspection and debugging. Trigger when writing application flows, adding logging to modules, or creating interactive CLI commands.

Zephyr Kernel Basics

Master the essential services that bring your Zephyr application to life.

Core Workflows

1. Threads & Scheduling

Create and manage multi-threaded application flows.

•Reference: threads.md
•Key Tools: K_THREAD_DEFINE, k_sleep, k_yield, Priorities.

2. Logging & Diagnostics

Implement layered logging for better observability and troubleshooting.

•Reference: logging.md
•Key Tools: LOG_MODULE_REGISTER, LOG_INF, LOG_ERR, Dynamic Filtering.

3. Interactive Shell (CLI)

Build powerful command-line interfaces for hardware and software inspection.

•Reference: shell.md
•Key Tools: SHELL_CMD_REGISTER, SHELL_STATIC_SUBCMD_SET_CREATE.

Quick Start (Logging)

#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(my_app, CONFIG_APP_LOG_LEVEL);

void my_fn(void) {
    LOG_INF("Hello from Zephyr!");
}

Quick Start (Threads)

K_THREAD_DEFINE(worker_tid, 1024, worker_fn, NULL, NULL, NULL, 5, 0, 0);

Resources

•
References:
- •threads.md: Configuration and creation of kernel threads.
- •logging.md: Log levels, modules, and backends.
- •shell.md: Interactive command registration and subcommands.