embedded-lab/labs/004_button_pullup_pulldown/firmware.md

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.