nRF54L15 SPI support half-duplex?

[LinJunXuan]

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.

https://hlord2000.github.io/

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

[Hung Bui]

Hi,

What I meant is to assign MISO to a pin that you don't use on the board. 

[hmolesworth]

You might consider enabling MISO but connect to the same pin as MOSI. This has the side effect of allowing the check that the transmitted data was actually present at the pin by comparing Tx data with Rx data; in effect a loopback mode. Easy with nrfx, some versions of nRFCnnect may disapprove and not allow loopback.