问Adafruit nrf52840循环程序

EN

#This example acts as a BLE HID keyboard to peer devices.
#Attach five buttons with pullup resistors to Feather nRF52840
#each button will send a configurable keycode to mobile device or computer

  import time
  import board
  from digitalio import DigitalInOut, Direction

  import adafruit_ble
  from adafruit_ble.advertising import Advertisement
  from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
  from adafruit_ble.services.standard.hid import HIDService
  from adafruit_ble.services.standard.device_info import DeviceInfoService
  from adafruit_hid.keyboard import Keyboard
  from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
  from adafruit_hid.keycode import Keycode

  button_1 = DigitalInOut(board.D11)
  button_2 = DigitalInOut(board.D10)
  button_3 = DigitalInOut(board.D9)
  button_4 = DigitalInOut(board.D6)
  button_5 = DigitalInOut(board.D5)

  button_1.direction = Direction.INPUT
  button_2.direction = Direction.INPUT
  button_3.direction = Direction.INPUT
  button_4.direction = Direction.INPUT
  button_5.direction = Direction.INPUT

  hid = HIDService()

  device_info = DeviceInfoService(software_revision=adafruit_ble.__version__,
                                  manufacturer="Adafruit Industries")
  advertisement = ProvideServicesAdvertisement(hid)
  advertisement.appearance = 961
  scan_response = Advertisement()
  scan_response.complete_name = "CircuitPython HID"

  ble = adafruit_ble.BLERadio()
  if not ble.connected:
      print("advertising")
      ble.start_advertising(advertisement, scan_response)
  else:
      print("already connected")
      print(ble.connections)

  k = Keyboard(hid.devices)
  kl = KeyboardLayoutUS(k)
  while True:
      while not ble.connected:
          pass
      print("Start typing:")

      while ble.connected:
          if not button_1.value:  # pull up logic means button low when pressed
              k.send(Keycode.DOWN_ARROW)
              time.sleep(0.4)

          if not button_2.value:
              k.send(Keycode.LEFT_ARROW)
              time.sleep(0.4)

          if not button_3.value:
              k.send(Keycode.UP_ARROW)
              time.sleep(0.4)

          if not button_4.value:
              k.send(Keycode.RIGHT_ARROW)
              time.sleep(0.4)

          if not button_5.value:
              k.send(Keycode.ENTER)
              time.sleep(0.4)

      ble.start_advertising(advertisement)