Byteparadigm's Logstorm is our recommendation if you are looking for SPI/I2C Analyser.This comes in 2 models: LOG Storm – 2MS and LOG Storm – 8MS. Also this is a multi function device with Logic Analyser and Data Logger features.
Specifications
Logic Analyzer, Digital Data Logger & SPI/I²C Analyzer
20 bits / 100 MHz sampling
125 MHz state analysis
Large 2 MSample memory
SPI & I²C protocol decoders
Waveform viewer
Extended triggering options
Harwdare data filtering / data qualification
Multi-trigger capture ability
‘Always-ON’ ability, enabling gigabyte of data capture
Win 32/64 GUI
Royalty-free C/C++ API
License for LOG Storm Studio
Free upgrades of LOG Storm Studio software
Delivered with USB cables and flying lead wires