code: def platform_detect():
      
      # Handle Raspberry Pi
      pi = pi_version()
      if pi is not None:
          return RASPBERRY_PI
  
      # Handle Beaglebone Black
      # TODO: Check the Beaglebone Black /proc/cpuinfo value instead of reading
      # the platform.
      plat = platform.platform()
      if plat.lower().find('armv7l-with-debian') > -1:
          return BEAGLEBONE_BLACK
      elif plat.lower().find('armv7l-with-ubuntu') > -1:
          return BEAGLEBONE_BLACK
      elif plat.lower().find('armv7l-with-glibc2.4') > -1:
          return BEAGLEBONE_BLACK
      elif plat.lower().find('armv7l-with-arch') > -1:
          return BEAGLEBONE_BLACK
  
      # Couldn't figure out the platform, just return unknown.
      return UNKNOWN
docs: Detect if running on the Raspberry Pi or Beaglebone Black and return the
      platform type.  Will return RASPBERRY_PI, BEAGLEBONE_BLACK, or UNKNOWN.