Debugging with a Logic Analyzer

Introduction

While an oscilloscope is great for looking at analog voltages, a Logic Analyzer is better for looking at digital data. It can decode entire "conversations" between chips.

When to Use

• Debugging "No communication" errors.
• Verifying SPI clock speeds.
• Reverse engineering unknown digital signals.

Software

Most affordable analyzers use PulseView (sigrok) or Saleae Logic.

1. Connect the analyzer probes to SDA/SCL.
2. Set the sample rate (usually 24MHz).
3. Click Capture and use the "I2C Decoder" to see the hex values.