What is "the software i2c controller" - Raspberry Pi Forums

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what difference between dtoverlay=i2c-rtc , dtoverlay=i2c-rtc-gpio?

"the software i2c controller"

the i2c-gpio overlays bind bitbashing i2c driver respective gpio pins. "software" element provided linux kernel , emulates i2c protocol reading pin state , driving output "low" when necessary. it's considerably slower i2c hardware peripheral guaranteed correct (and can perform e.g. repeated starts/clock stretching @ point in transfer).


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