Is it possible to drive a second SPI device with the RAK4600? I want to drive a e-ink display.
Welcome to RAK forum @lolsborn ,
The SPI on nrf52832 used in RAK4600 is already connected to the LoRa transceiver. In theory, SPI could share common serial bus but I haven’t seen one that uses same SPI lines with a LoRa transceiver.
Our RUI V2 examples do not support that as well.
Based on your question, it seems you are working on your own firmware. Maybe another option you can have is to bit-bang an SPI functionality to some IOs which can control the e-ink display.