I saw some posts online about using SPI to simulate the timing of WS2812. I thought using peripherals could save CPU time, but I noticed that SPI seems unable to configure single bus mode and can only use 4 pins.
I still used the pin allocation website because I need to draw a schematic and use the website to confirm if the pin allocation is correct.
In summary, I would like to know if SPI can only use 4 wires. If I want to use a single wire, can I sacrifice the other 3 IO ports and only connect to MOSI
