ShiftPWM support topic. Latest update: Schematics, high power LED's, LED strips

Using Arduino LEDs and Multiplexing
30

I think you can change > by XOR and maybe save some CPU cicles
like
if (rgbPWM[i+0] XOR pwm) d |= 0x80; // means rgbPWM[i+0] == pwm

But you need to use the start cicle to reset all pins.(count 0)
and save 'd' out between ISR_Calls