UIFlow Guide
spi2 = machine.SPI(1, 500000, sck=machine.Pin(-1), miso=machine.Pin(-1), mosi=machine.Pin(-1), firstbit=machine.SPI.MSB, polarity=0, phase=0)
spi2.deinit()
spi2.write(_)
spi2.write_readinto(_, _)
str(spi2.read(0))
spi2.readinto(_)