In a blog post from a few years ago, [Peter Molnar] explains in detail how to wire up a physical adapter to add a USB-connected I2C interface to a system. At its core is the ATtiny85 AVR-based MCU ...
I2C Master/Slave Controller core implements a bidirectional serial interface compatible with the NXP’s I2C bus specification and supports all transfer modes from and to the I2C bus. I2C is a ...