[riot-notifications] [RIOT-OS/RIOT] spi_transfer_reg behavior doesn't follow doc (#11763)

Thomas Stilwell notifications at github.com
Sat Jul 20 21:58:20 CEST 2019

Is there a standard among SPI slaves for what data can/must be sent in the receive-only case? If we have a guarantee that sending 0x00 is always ok then we can change the function behavior, but otherwise the behavior is correct and it's the documentation that needs to change.

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