• GPIO
  • Intermediate
  • 5 min
  • Serial CLI

Recipe · Intermediate · GPIO

How to listen to GPIO activity

Use listen to route GPIO activity to configured I2S audio output for a quick audible signal check.

I2S audio signal between microphone and speaker.
Listen can make GPIO activity audible when an I2S output is configured.
Step 1

Commands

These commands are documented as global or quick-start commands.

Result

What it means

If the command returns the expected output, the firmware and terminal session are ready for the next workflow.

Troubleshooting

  • Check I2S output configuration.
  • Try a signal known to toggle first.
  • Use wizard or logic if audio output is not available.

Next steps

  • Try the same workflow on a known safe pin or target.
  • Save the useful command as a note or alias.
  • Move to the protocol-specific recipe once the basics work.

GPIO listen FAQ

What is the point of listening to GPIO activity?

Audio makes activity easy to notice while probing or moving wires. It is a quick presence check for toggling signals, not a precise timing measurement.

Why do I hear nothing even though the signal is active?

The I2S audio output may not be configured, the signal may be too slow or too fast to be useful audibly, or the selected GPIO may not be the active line.

What should I use when audio is not enough?

Use wizard, DIO sniff, the on-device logic view or the SUMP logic analyzer depending on how much timing detail you need.

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