The popular I2C slave library has been updated with support for USI slave mode and Xmega TWI slave mode.
The I2C slave lib supports almost all AVR micro's now. Support for the USI in TWI slave mode has been added. This allows to use TINY AVR chips like ATTINY2313 to be used as I2C slave chips.
Support for XMega TWI slave mode has been added as well.
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