Think I've killed the STM32F. LCD isn't showing anything, there's a funny audible scratching sound when I press the laser firing button and even though the laser fires, I can't get anything useful out of the previously active pins. This is all after I tried soldering a jumper wire to all the exposed pads and there's a good chance some of them hit the 9V rail on my breadboard power supply.

Oh well. Perhaps time to try a different laser distance measurer. There's a Bosch PLR15 in the post...