My apologies. I have corrected #20.
All 3 devices are Slaves. The AVR is Master.
When you have a pin called MOSI it means Master-Out, Slave-In.
SCK means Serial ClocK
The confusing pin name is D/C. Data/Command. Sometimes called RS Register Select. Or A0 Address #0.
None of these should be too difficult for French speakers. I suspect that Chinese find these names harder.
David.