Merge remote-tracking branch 'ada/master' into jetson

diff --combined src/board.py
index fef78ee0a36c3c3193b1272d50bf5f04077a02b9,c89fd43ddcb0fa3a141fbadef00b7f2747f8a817..db6f8a4655bb5ec59b1e32b7db6d3a59895a879d
--- 1/src/board.py
--- 2/src/board.py
+++ b/src/board.py
@@@ -70,11 -70,21 +70,21 @@@ elif board_id == ap_board.JETSON_TX2
  elif board_id == ap_board.JETSON_XAVIER:
      from adafruit_blinka.board.jetson_xavier import *
  
 -elif board_id == ap_board.JETSON_TXX:
 -    from adafruit_blinka.board.jetson_txx import *
 +elif board_id == ap_board.JETSON_NANO:
 +    from adafruit_blinka.board.jetson_nano import *
  
  elif "sphinx" in sys.modules:
      pass
  
  else:
      raise NotImplementedError("Board not supported")
+ 
+ def I2C():
+     """The singleton I2C interface"""
+     import busio
+     return busio.I2C(SCL, SDA)
+ 
+ def SPI():
+     """The singleton SPI interface"""
+     import busio
+     return busio.SPI(SCLK, MOSI, MISO)