I2C Bus Analyzer with USB link to PC

I2C-bus analyzer is a electronic project that has function to capture all transmissions via I2C/TWI bus, decode it and send to PC via virtual RS-232 port. Received data can be displayed by any terminal program on PC computer. The project use ATTiny2313 microcontroller with 20MHz crystal as main part. Link to PC are realized by FTDI FT245RL on UM245R module.

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Schematic
PCB bottom layer
PCB top layer (wire jumpers)
PCB top overlay
Firmware
link