vu2 VS FastLED

It’s is available to read at https://github.com/ben-xo/vu2 and depends on a modified version of FastLED at https://github.com/ben-xo/FastLED

I rewrote it using Fixed Point math and now it only takes about 8% CPU. https://github.com/ben-xo/vu2/blob/master/PeckettIIRFixedPoint.cpp

I found a very old post from Daniel Garcia which indicates that I might be able to prevent FastLED from using interrupts, which I thought would solve my issue but doesn't seem to have helped (again, HIGHLY likely that I've done something wrong, don't pull your punches!) I've also tried a fork of the library from ben-xo that doesn't SEEM to help either (https://github.com/ben-xo/FastLED)

It’s is available to read at https://github.com/ben-xo/vu2 and depends on a modified version of FastLED at https://github.com/ben-xo/FastLED

More cli() sei() points during writing out bits to the WS2812s. They would probably mess with other features I’m not using (such as the clock correction) - I forked and pushed my changes to https://github.com/ben-xo/FastLED none the less. If your interrupt handlers are very short, then this doesn’t disturb the light timing enough for the colours to go haywire. One of my interrupts just reads samples into a buffer, another counts frames, the third toggles LED pins for PWM. You have to offset the timers so they don’t fire at once - but it works!