Well I have two MAX7219 boards wired up with leds but I can only sort of get communication with them going.
Also when the leds turn off I hear noise through my speakers and the regulator on the board gets very hot all the time.
When power is applied, all the LEDs are on at full power. The datasheet seems to say that they should be all off.
And when they are ‘off’ they are only dimmed. Still easily visible though.
With the standard code on the playground (and all the modifications to it that I’ve done) I can only get all on or all off.
With some code xSmurf used I could get a kind of ‘ripple’ effect but the effect had nothing to do with what the code was doing although the timing was right (delays stopped the ripple).
I’m kind of out of ideas. They are behaving rather weirdly.