I have been working the past couple of days on making the NRF52 play nice with FastLED and have made some progress some might like to see. Thus far I have only done testing on a strip of APA102 leds using the FirstLight and ColorPallette and while I do not have it working perfectly, it is definitely a start.
A couple of issues I have right now are that occasionally between refreshes, pixels that are supposed to be dark are firing the red portion of the pixel. Another glitch is that I am getting pixels lighting up past the defined end of my strip randomly.
I have replied to the open issue on Github with my fork of the repo with my changes. Any help from others is more than welcome.