This simulates an I2C device via bit-banging.
It ACKs on all 7-bit addresses and returns the data b"012345678901234567890123456789" for every register.
The code is intentionally not fancy - it's not even using interrupts.
When using it with e.g. an SSD1306 display driver you need to disable the console output. (VERBOSE) - also always run in release mode.
SDA is on GPIO 1, SCL is on GPIO 2.
Additionally it can simulate clock-stetching by changing CLOCK_STRETCH_DELAY_US
If it doesn't work you might need to add external pull-up resistors.
This is really just for testing purposes - it might crash or act weird in many ways.