SPI traits
Blocking SPI API
Serial Peripheral Interface
SPI mode
SPI error kind
Clock phase
Clock polarity
Helper for CPOL = 0, CPHA = 0
Helper for CPOL = 0, CPHA = 1
Helper for CPOL = 1, CPHA = 0
Helper for CPOL = 1, CPHA = 1
SPI error
SPI error type trait