import bitbangio
import board

spi = bitbangio.SPI(board.D10, board.D6, board.D9)

while not spi.try_lock():
    pass

a = bytearray(6)
spi.write_readinto(bytes([2, 54, 9, 88]), a, in_start=2, in_end=4, out_start=1, out_end=3)

#if mosi and miso are connected this should print 0, 0, 54, 9, 0, 0
for b in a:
    print(b)