If you want a solution running on an ARM MCU (Due, Zero, Teensy 3.x), you want to use pins on port H or above on an ATmega256, or you want to use many different I2C buses, this library is not the right solution for you. Even on an ATtiny running with 1MHz, one can still operate theīus with 33 kHz, which implies that you can drive slave devices that use the SMBus protocol (which timeout if the the bus frequency is below 10 kHz). I adapted Peter Fleury's I2C software library that is written in AVR assembler, extremely light weight (just under 500 byte in flash) and very fast.
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