Otherwise, some call sites will certainly forget this...

Sometimes we might want host-side software to control it, or even to just turn it off.

This is necessary for reprogramming a Fadecandy board without access to the physical button.

The firmware is feature-complete now, and this will save folks the trouble of downloading a huge toolchain. Plus I like to keep tabs on the quality of the assembly output :)

This makes the mapping from 16-bit color to LUT entry straightforward, while still fully defining the entire range from 0x0000 through 0xFFFF. This fixes an edge case where colors greater than 0xFF00 would wrap past the end of the R/G LUTs onto the next color channel.

The first frame after a new keyframe arrives would be using the wrong interpolation coefficient.

This amazingly helps quite a lot! The idle time between frames is down from 0.8ms to 0.66ms now.

This reverts commit 07106959.

This reverts commit f5e7cc2e.

This actually makes us slightly slower, due to increased register pressure, but I think if I can alleviate that we'll see a speedup.

Woo!