https://en.wikipedia.org/wiki/Bit_banging
Bit banging - Wikipedia
bit bangingwikipedia
https://manpages.ubuntu.com/manpages/questing/man4/gpioiic.4freebsd.html
Ubuntu Manpage: gpioiic - GPIO I2C bit-banging device driver
GPIO I2C bit-banging device driver
bit bangingubuntumanpagegpiodevice
https://manpages.ubuntu.com/manpages/resolute/man4/gpioiic.4freebsd.html
Ubuntu Manpage: gpioiic - GPIO I2C bit-banging device driver
GPIO I2C bit-banging device driver
bit bangingubuntumanpagegpiodevice