i want to use raspberry PI to control SK9822 led strip for decoration on our tree , if anybody have try it , are there any library code for this chip ?
You may be better off with an Arduino than a Pi. The Pi’s non-real time OS may screw you over, and controlling things like led strips typically takes precise timing, which the Pi doesn’t have (barring a few highly specific DMA hacks).
Teensy LCs are a low cost (duh) way to control LED strips. FastLED supports SK9822s.