3 A Software Implementation of the I2C Bus
Although the vast majority of widely used I2C functionality comes as part of a peripheral IC or a CPU on an SBC, occasionally you may need to develop firmware for hardware that does not provide I2C support. In that case, you’ll have to implement the I2C protocol in software.
This chapter shows how to implement both controller and peripheral devices using nothing more than GPIO pins on a standard microcontroller (MCU). I will use the Teensy 3.2 as an example, though the same principles apply to almost any device with at least two programmable I/O pins. If you want to use this code for some other ...
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