AI Camera also (optionally) makes use of MICDAT on the Unicam cable to enable fast_xfer mode using RP1 (The I2C bus is locked and SDA is re-muxed to GPIO during fast_xfer). You should ensure that you disable fast_xfer in the overlay if you have other devices on your I2C bus that are unable to handle high frequency I2C void messages (which are illegal in the I2C spec).
Statistics: Posted by roliver — Mon Dec 08, 2025 10:18 am