I'm trying to simulate an ATmega168P working as an SPI slave in AVR Simulator 2, but regardless of what values I write into SPDR, the simulated processor always reads back zero.
Is what I'm trying to do possible at all?
Simulating SPI slave possible?
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In simulation you can not see the data transaction between Master and Slave.
I assume you are performing on-chip debugging and not just a simulation.
I also assume that you are performing line by line (step-in) debugging mode where it is not possible to view the data transfered through protocol.
You better Run the code and place breakpoints at appropriate/suitable place which won't interfer in the main process. Then you can see the received data in the simulator window.