# Firmware

## Expected Behavior

- Configure GPIO as input.
- Read button state.
- Print state to serial or toggle LED.
- Optional: compare external resistor with internal pull-up.

## Physical Test Procedure

1. Measure GPIO idle voltage.
2. Press button and measure GPIO voltage.
3. Run firmware and compare serial/LED state with measurements.

## Code

TODO: добавить firmware после выбора GPIO и workflow.

## Actual Result

TODO: записать фактическое поведение.