I'm looking into learning about the current state of I2C / TWI driver implementations for the AVR32 family of MCUs, specifically UC3C. As far as I know, the most commonly recommended implementations that seem to be used by lots of people are the library from Peter Fleury and the AVR315 Application Note from Atmel. However they are specifically for 8-bit AVR microcontrollers, and won't work with an AVR32 UC3.
This comes from the somewhat disappointing state of the TWI Master driver that canbe found in the Atmel Software Framework, which is hardcoded to use only one TWIM interface (at least for the UC3C family as far as I'm concerned). There is already a 3 years old bug report still open, and most search results from Google tend to show up old threads which are several years old, with no new information on the matter, or with information not applicable to the AVR32 family.
I'm interested in well maintained, well-proven and robust implementations, preferably free but I would also look into paying for a good quality implementation. I'd rather not use some sample library which was posted 2 or 3 years ago in some lost website or forum and not updated since, which is mostly what I have found so far.
To be honest I've found a bit surprising the lack of recent conversation in the community about this topic, given that anyone trying to use the current ASF to program more than one TWIM interface today, won't be able to do it. If there is actually such conversation, please let me know because my Google-fu must have failed me then!