Recently, I wanted to access I2C EEPROM with Arduino. However, AVR-Ada (1.1.0) provides no support for I2C interface which many AVR processors and Arduinos have. So, I had to write a package ("Two_Wire") for it.
Example code is available at arduino-eeprom repository and below is the used circuit:
The package is far from perfect, but it should provide a place to start if someone needs to use I2C with AVR-Ada.