For Feather M0 Express, ItsyBitsy M0 Express and
Metro M0 Express:
Connect VIN on the breakout to 3V/3.3 on the
board.
Connect GND on the breakout to G/GND on the
board.
Connect BCLK on the breakout to D1/TX on the
board.
Connect WSEL on the breakout to D0/RX on the
board.
Connect DIN on the breakout to D9 on the board.