I have been forced to modify twi.c myself to accomplish what you want.
It might be hard to have a software flag enable pull-ups to another voltage though, you should either implement the resistors externally, or run the AVR at 3.3V at 8 MHz
I have been forced to modify twi.c myself to accomplish what you want.
It might be hard to have a software flag enable pull-ups to another voltage though, you should either implement the resistors externally, or run the AVR at 3.3V at 8 MHz