SPI_start_transaction — start a new transaction
SPI_start_transaction starts a
new transaction. It can only be called after
SPI_rollback, as there is no transaction
active at that point. Normally, when an SPI-using procedure is
called, there is already a transaction active, so attempting to
start another one before closing out the current one will
result in an error.
This function can only be executed if the SPI connection has
been set as nonatomic in the call to
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