1  # SPDX-FileCopyrightText: 2020 Carter Nelson for Adafruit Industries
  2  #
  3  # SPDX-License-Identifier: MIT
  4  
  5  # Display stuff
  6  import board
  7  import displayio
  8  import adafruit_imageload
  9  from adafruit_bitmap_font import bitmap_font
 10  from adafruit_display_text import label
 11  # BLE stuff
 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.packet import Packet
 16  from adafruit_bluefruit_connect.color_packet import ColorPacket
 17  
 18  #---| User Config |--------------------------------------------------
 19  BLE_NAME = "Candy Heart"
 20  MESSAGE_DELIMITER = ","
 21  MESSAGE_COLOR = 0xFF0000
 22  #---| User Config |--------------------------------------------------
 23  
 24  # Setup BLE radio and service
 25  ble = BLERadio()
 26  uart = UARTService()
 27  advertisement = ProvideServicesAdvertisement(uart)
 28  ble._adapter.name = BLE_NAME #pylint: disable=protected-access
 29  
 30  # Create the display
 31  display = board.DISPLAY
 32  
 33  # Load the candy heart BMP
 34  bitmap, palette = adafruit_imageload.load("/images/heart_bw.bmp",
 35                                            bitmap=displayio.Bitmap,
 36                                            palette=displayio.Palette)
 37  
 38  heart = displayio.TileGrid(bitmap, pixel_shader=palette)
 39  
 40  # Set up message text
 41  LINE1_MAX = 9
 42  LINE2_MAX = 5
 43  font = bitmap_font.load_font("/fonts/Multicolore_36.bdf")
 44  line1 = label.Label(font, text="?"*LINE1_MAX)
 45  line2 = label.Label(font, text="?"*LINE2_MAX)
 46  line1.anchor_point = (0.5, 0)    # middle top
 47  line2.anchor_point = (0.5, 1.0)  # middle bottom
 48  line1.anchored_position = (120, 85)
 49  line2.anchored_position = (120, 175)
 50  line1.color = line2.color = MESSAGE_COLOR
 51  
 52  # Set up group and add to display
 53  group = displayio.Group()
 54  group.append(heart)
 55  group.append(line1)
 56  group.append(line2)
 57  display.show(group)
 58  
 59  def update_heart(message, heart_color):
 60      # turn off auto refresh while we change some things
 61      display.auto_refresh = False
 62      # set message text
 63      text1, _, text2 = message.partition(MESSAGE_DELIMITER)
 64      line1.text = text1[:LINE1_MAX] if len(text1) > LINE1_MAX else text1
 65      line2.text = text1[:LINE2_MAX] if len(text2) > LINE2_MAX else text2
 66      # update location for new text bounds
 67      line1.anchored_position = (120, 85)
 68      line2.anchored_position = (120, 175)
 69      # set heart color
 70      palette[1] = heart_color
 71      # OK, now turn auto refresh back on to display
 72      display.auto_refresh = True
 73  
 74  # Initial update
 75  text = "TEXT,ME"
 76  color = 0x00FFFF
 77  update_heart(text, color)
 78  
 79  # Loop forever
 80  while True:
 81      # advertise and wait for connection
 82      print("WAITING...")
 83      ble.start_advertising(advertisement)
 84      while not ble.connected:
 85          pass
 86  
 87      # connected
 88      print("CONNECTED")
 89      ble.stop_advertising()
 90  
 91      # receive and handle BLE traffic
 92      while ble.connected:
 93          if uart.in_waiting:
 94              raw_bytes = uart.read(uart.in_waiting)
 95              if raw_bytes[0] == ord('!'):
 96              # BLE Connect Control Packet
 97                  packet = Packet.from_bytes(raw_bytes)
 98                  if isinstance(packet, ColorPacket):
 99                      print("color = ", color)
100                      color = packet.color
101              else:
102              # Just plain text
103                  text = raw_bytes.decode("utf-8").strip()
104                  print("text = ", text)
105              update_heart(text, color)
106  
107      # disconnected
108      print("DISCONNECTED")