SPI.setBitOrder(order)
SPI.setBitOrder(slaveSelectPin, order)
Sets the order of the bits shifted out of and into the SPI bus, either
LSBFIRST (least-significant bit first) or MSBFIRST (most-significant bit
first). MSBFIRST is the default.
SPI.setBitOrder(order)
SPI.setBitOrder(slaveSelectPin, order)
order: either LSBFIRST or MSBFIRST