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Community / AGENT SKILL
kernel-basics
0
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.
Understand the trade-offs.
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The full skill.
Original instructions from the publisher’s SKILL.md
# 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](references/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](references/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](references/shell.md)**
- **Key Tools**: `SHELL_CMD_REGISTER`, `SHELL_STATIC_SUBCMD_SET_CREATE`.
## Quick Start (Logging)
```c
#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)
```c
K_THREAD_DEFINE(worker_tid, 1024, worker_fn, NULL, NULL, NULL, 5, 0, 0);
```
## Automation Tools
- **[log_summary.py](scripts/log_summary.py)**: Parse Zephyr runtime logs and summarize counts by level/module.
## Examples & Templates
- **[shell_command_template.c](assets/shell_command_template.c)**: Starter command set for shell registration patterns.
## Validation Checklist
- [ ] Log output includes module tag and expected log level filtering.
- [ ] At least one worker thread starts and runs at the intended priority.
- [ ] Shell command registration appears in `help` output and executes without faults.
- [ ] No blocking or mutex misuse appears in ISR-context paths.
## Resources
- **[References](references/)**:
- `threads.md`: Configuration and creation of kernel threads.
- `logging.md`: Log levels, modules, and backends.
- `shell.md`: Interactive command registration and subcommands.
- **[Scripts](scripts/)**:
- `log_summary.py`: Runtime log summarizer for quick diagnostics.
- **[Assets](assets/)**:
- `shell_command_template.c`: Shell command registration template.