Sniffing I2C traffic - Githubissues

tomek-o / CH341A-tool

Windows tool for using CH341A EEPROM/FLASH programmer for other purposes

https://tomeko.net/software/CH341A_tool/

Other

75 stars 15 forks source link

Sniffing I2C traffic #2

Open RChadwick7 opened 5 months ago

RChadwick7 commented 5 months ago

While the software/hardware seems to work (I can detect all my i2c devices fine), I'm trying to see what a specific chip is receiving, or at least see whatever is being sent on the I2C bus. Can CH341A-Tool do that? I've been looking everywhere for a simple I2C sniffer, thought CH341A-Tool could do that, but maybe i misread the description?

tomek-o commented 5 months ago

I2C reading/writing (including scanning for connected devices) and I2C sniffing are two separate things. CH341 does not seem to be capable to capture raw data (e.g. reading GPIOs) fast enough to be useful as a sniffer.

You need a logic analyzer. Popular small Cypress FX2/FX2LP Saleae clone costs less than $10 offering incredible value/cost ratio with free Pulseview software.