This app note ("Using the Inter-Integrated Circuit on Coldfire+ and Kinetis") is explicitly referenced in the Kinetis documentation for the part I'm using (KL16). I can find the app note itself just fine, but despite lots of searching I cannot find the accompanying source code. The app note contains code snippets, but not the whole thing.
I know that the code included with the FRDM board has its own i2c driver, but it is quite inferior, e.g. it does not support interrupts, only polling. Can someone point me to the original source archive for AN4342?