We need to note that the CH5xx MCUs are 3V3 systems.  NEOpixel strips typically require a 5V pulse stream on the Data Line.  So we need some type of level shifter on the SPI MOSI line. I prefer just using a regular old TTL Inverter like a 74LS04.  A 74HC14 works even better as it will clean up the signal.  In either case connect the MOSI output to pin 1 of the inverter. Connect pins 2 and 3 together. Connect a resistor (100-500 ohms) from pin 4 to the data line of the NEOpixel strip.