SPI_connect, SPI_connect_ext — connect a C function to the SPI manager
SPI_connect opens a connection
from a C function invocation to the SPI manager. You must call
this function if you want to execute commands through SPI. Some
utility SPI functions can be called from unconnected C
SPI_connect_ext does the same
but has an argument that allows passing option flags.
Currently, the following option values are available:
Sets the SPI connection to be nonatomic, which means that transaction
allowed. Otherwise, calling these functions will result
in an immediate error.
SPI_connect() is equivalent to
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