Wakeup from deep sleep over SPI?

[Brett]

I have an nRF52840 acting as a SPI slave to another processor. If I put the nRF52840 into a deep sleep mode, how can we wake it back up over SPI? I typically have only seen examples of using a GPIO to wake up from deep sleep.

[Jørgen Holmefjord]

Hi,

SPI is not supported as a wakeup source from deep sleep/system OFF mode. You will have to configure one of the SPI lines (preferably SS/CSN) as a GPIO wakeup source, and then initialize SPIS when the chip is done waking up.

Best regards,
Jørgen