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I2C Protocol Analyzer for Saleae Logic 2

This analyzer will decode I2C, with a handful of benefits over the bundled I2C analyzer.

Settings

Decode in confidence, with the ability to configure a built-in glitch filter, and granular control over what data appears in the results table.

settings screenshot

Edge-by-Edge Visibility

The analyzer operates in clear view, showing you the decision it made at each point of the signal - great for learning or identifying where something went wrong.

edge-by-edge screenshot

Tabular Data

Data is decoded into three categories - Control, Frame and Transaction... each can be independently enabled and disabled.

  • "Control" includes the start, restart, stop and error conditions
  • "Frame" is a per-frame decode, indicating the address or data value
  • "Transaction" is a per-transaction decode, including the full binary payload

table screenshot

Filter by Address

For the more busy busses, filtering based on the target address will provide instant visibility on when the device is active. The edge-by-edge details are still visible for everything, but bubbles and table data will only be produced according to the target address you specify.

filtered screenshot

Glitch Filtering

Robust built-in glitch filtering helps to provide valid decodes, even when your data isn't perfect. In this screenshot there are actually three 8ns glitches in the clock signal, but the decode is still correct.

gliches screenshot

Build and Install

See: i2c-analyzer

Go to: Edit -> Settings -> Custom Low Level Analyzers

Linux

cmake -S . -B build
make -C build

See: ./build/Analyzers/*.so

Windows

  • Install Visual Studio 2019 Community
  • Install CMake
  • Install git
cmake -S . -B build
cmake --build build --config Release

See: ./build/Analyzers/Debug/*.dll