I’ve just got a new feather charlie wing and uploaded the swirl test to it, but there’s a cross of LEDs which aren’t lighting up. Given the code is supposed to talk to the led driver chip, which in turn sets which LEDs to turn on, I’m wondering if this is a faulty board?
Sounds plausible, unfortunately I don’t know enough about it to be sure. You’re best asking on the Adafruit forums here: https://forums.adafruit.com/viewforum.php?f=57