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How to implement a simple SPI-Slave function on nRF52 PCA10040 board.

robin@...
 

I am attempting to create a simple SPI-Slave implementation for the nRF52 PCA10040 board.  
My project’s source code is at https://github.com/foldedtoad/spi_slave.
 
While I am able to receive events whenever the SPI-Master (host) sends data, the receive buffers are empty. 
A logic analyzer trace shows good SPI protocol from the SPI-Master.

I have looked for examples which might shed some light on how to implement an starter version of a SPI-Slave on the nRF52 series. 

Any guidance or suggestions as to what prevents my code from receiving data would be appreciated.

Cheers,
Robin
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