Working on a project right now and have been thinking of different methods I can go about. Looks like I can reduce the software by generating some signals based off of other signals, but would require a lot of extra hardware it seems (one line should have a pulse at clock / 8 * # of units)
I'm no electrician, so I was going to go about this with a counter and mux on each board, sending the a pulse to the next board when clock / 8 is reached, then have a loop back.
Seems for something so simple software is more ideal and lower cost, but just an example