1  # SPDX-FileCopyrightText: 2020 Liz Clark for Adafruit Industries
  2  #
  3  # SPDX-License-Identifier: MIT
  4  
  5  '''BLE Synth
  6  File for the Feather nFR52840
  7  Keyboard Portion'''
  8  import time
  9  import board
 10  import digitalio
 11  import adafruit_led_animation.color as color
 12  from adafruit_ble import BLERadio
 13  from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
 14  from adafruit_ble.services.nordic import UARTService
 15  from adafruit_bluefruit_connect.color_packet import ColorPacket
 16  from adafruit_bluefruit_connect.button_packet import ButtonPacket
 17  
 18  #  setup for LED to indicate BLE connection
 19  blue_led = digitalio.DigitalInOut(board.BLUE_LED)
 20  blue_led.direction = digitalio.Direction.OUTPUT
 21  
 22  #  setting up the buttons
 23  switch_pins = [board.D5, board.D6, board.D9, board.D10,
 24                 board.D11, board.D12, board.D13, board.A0, board.A1, board.A2,
 25                 board.A3, board.A4]
 26  switch_array = []
 27  
 28  #  creating the button array
 29  for pin in switch_pins:
 30      switch_pin = digitalio.DigitalInOut(pin)
 31      switch_pin.direction = digitalio.Direction.INPUT
 32      switch_pin.pull = digitalio.Pull.UP
 33      switch_array.append(switch_pin)
 34  
 35  #  states for button debouncing
 36  switch1_pressed = False
 37  switch2_pressed = False
 38  switch3_pressed = False
 39  switch4_pressed = False
 40  switch5_pressed = False
 41  switch6_pressed = False
 42  switch7_pressed = False
 43  switch8_pressed = False
 44  switch9_pressed = False
 45  switch10_pressed = False
 46  switch11_pressed = False
 47  switch12_pressed = False
 48  switches_pressed = [switch1_pressed, switch2_pressed, switch3_pressed, switch4_pressed,
 49                      switch5_pressed, switch6_pressed, switch7_pressed, switch8_pressed,
 50                      switch9_pressed, switch10_pressed, switch11_pressed, switch12_pressed]
 51  
 52  #  colors from Animation library to send as color packets
 53  #  named for notes
 54  color_C = color.RED
 55  color_Csharp = color.ORANGE
 56  color_D = color.YELLOW
 57  color_Dsharp = color.GREEN
 58  color_E = color.TEAL
 59  color_F = color.CYAN
 60  color_Fsharp = color.BLUE
 61  color_G = color.PURPLE
 62  color_Gsharp = color.MAGENTA
 63  color_A = color.GOLD
 64  color_Asharp = color.PINK
 65  color_B = color.WHITE
 66  
 67  #  array for colors
 68  color = [color_C, color_Csharp, color_D, color_Dsharp, color_E,
 69           color_F, color_Fsharp, color_G, color_Gsharp, color_A,
 70           color_Asharp, color_B]
 71  
 72  #  BLE send_packet function
 73  def send_packet(uart_connection_name, packet):
 74      """Returns False if no longer connected."""
 75      try:
 76          uart_connection_name[UARTService].write(packet.to_bytes())
 77      except:  # pylint: disable=bare-except
 78          try:
 79              uart_connection_name.disconnect()
 80          except:  # pylint: disable=bare-except
 81              pass
 82          return False
 83      return True
 84  
 85  ble = BLERadio()
 86  
 87  uart_connection = None
 88  
 89  if ble.connected:
 90      for connection in ble.connections:
 91          if UARTService in connection:
 92              uart_connection = connection
 93          break
 94  
 95  while True:
 96      blue_led.value = False
 97      #  BLE connection
 98      if not uart_connection or not uart_connection.connected:  # If not connected...
 99          print("Scanning...")
100          for adv in ble.start_scan(ProvideServicesAdvertisement, timeout=5):  # Scan...
101              if UARTService in adv.services:  # If UARTService found...
102                  print("Found a UARTService advertisement.")
103                  blue_led.value = True #  LED turns on when connected
104                  uart_connection = ble.connect(adv)  # Create a UART connection...
105                  break
106          ble.stop_scan()  # And stop scanning.
107      #  while connected..
108      while uart_connection and uart_connection.connected:
109      #  iterate through buttons and colors
110          for switch_pin in switch_array:
111              i = switch_array.index(switch_pin)
112              switches_pressed_state = switches_pressed[i]
113              colors = color[i]
114              #  if the button is released
115              #  worked best if placed before the button press portion
116              if switch_pin.value and switches_pressed_state:
117                  print("button off")
118                  #  send button packet to stop tone & color (happens on CPB)
119                  if not send_packet(uart_connection,
120                                     ButtonPacket(ButtonPacket.RIGHT, pressed=True)):
121                      uart_connection = None
122                      continue
123                  switches_pressed[i] = False  # Set to False.
124                  #  time delay for BLE, otherwise issues can arrise
125                  time.sleep(0.05)
126              #  if button is pressed:
127              if not switch_pin.value and not switches_pressed_state:  # If button A pressed...
128                  #  send color packet
129                  if not send_packet(uart_connection, ColorPacket(colors)):
130                      uart_connection = None
131                      continue
132                  switches_pressed[i] = True  # Set to True.
133                  time.sleep(0.05)  # Debounce.