Merge branch 'master' of github.com:ladyada/Adafruit_Learning_System_Guides

Author: ladyada

CLUE_BLE_Morse_Code/clue_morse_code.py

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+import time
+import displayio
+import terminalio
+from adafruit_clue import clue
+from adafruit_display_text import label
+import adafruit_imageload
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
+
+#--| User Config |---------------------------------------------------
+MY_NAME = "ME"
+FRIENDS_NAME = "FRIEND"
+#--| User Config |---------------------------------------------------
+
+WAIT_FOR_DOUBLE = 0.05
+DEBOUNCE = 0.25
+
+# Define Morse Code dictionary
+morse_code = {
+    ".-"   : "A", "-..." : "B", "-.-." : "C", "-.."  : "D", "."    : "E",
+    "..-." : "F", "--."  : "G", "...." : "H", ".."   : "I", ".---" : "J",
+    "-.-"  : "K", ".-.." : "L", "--"   : "M", "-."   : "N", "---"  : "O",
+    ".--." : "P", "--.-" : "Q", ".-."  : "R", "..."  : "S", "-"    : "T",
+    "..-"  : "U", "...-" : "V", ".--"  : "W", "-..-" : "X", "-.--" : "Y",
+    "--.." : "Z",
+}
+
+# BLE Radio Stuff
+ble = BLERadio()
+uart_service = UARTService()
+advertisement = ProvideServicesAdvertisement(uart_service)
+ble._adapter.name = MY_NAME #pylint: disable=protected-access
+
+# Display Stuff
+display = clue.display
+disp_group = displayio.Group()
+display.show(disp_group)
+
+# Background BMP with the Morse Code cheat sheet
+bmp, pal = adafruit_imageload.load("morse_bg.bmp",
+                                   bitmap=displayio.Bitmap,
+                                   palette=displayio.Palette)
+disp_group.append(displayio.TileGrid(bmp, pixel_shader=pal))
+
+# Incoming messages show up here
+in_label = label.Label(terminalio.FONT, text='A'*18, scale=2,
+                       color=0x000000)
+in_label.anchor_point = (0.5, 0)
+in_label.anchored_position = (65, 12)
+disp_group.append(in_label)
+
+# Outging messages show up here
+out_label = label.Label(terminalio.FONT, text='B'*18, scale=2,
+                        color=0x000000)
+out_label.anchor_point = (0.5, 0)
+out_label.anchored_position = (65, 190)
+disp_group.append(out_label)
+
+# Morse Code entry happens here
+edit_label = label.Label(terminalio.FONT, text='....', scale=2,
+                         color=0x000000)
+edit_label.anchor_point = (0.5, 0)
+edit_label.anchored_position = (105, 222)
+disp_group.append(edit_label)
+
+def scan_and_connect():
+    '''
+    Advertise self while scanning for friend. If friend is found, can
+    connect by pressing A+B buttons. If friend connects first, then
+    just stop.
+
+    Return is a UART object that can be used for read/write.
+    '''
+
+    print("Advertising.")
+    central = False
+    ble.start_advertising(advertisement)
+
+    print("Waiting.")
+    friend = None
+    while not ble.connected:
+
+        if friend is None:
+            print("Scanning.")
+            in_label.text = out_label.text = "Scanning..."
+            for adv in ble.start_scan():
+                if ble.connected:
+                    # Friend connected with us, we're done
+                    ble.stop_scan()
+                    break
+                if adv.complete_name == FRIENDS_NAME:
+                    # Found friend, can stop scanning
+                    ble.stop_scan()
+                    friend = adv
+                    print("Found", friend.complete_name)
+                    in_label.text = "Found {}".format(friend.complete_name)
+                    out_label.text = "A+B to connect"
+                    break
+        else:
+            if clue.button_a and clue.button_b:
+                # Connect to friend
+                print("Connecting to", friend.complete_name)
+                ble.connect(friend)
+                central = True
+
+    # We're now connected, one way or the other
+    print("Stopping advertising.")
+    ble.stop_advertising()
+
+    # Return a UART object to use
+    if central:
+        print("Central - using my UART service.")
+        return uart_service
+    else:
+        print("Peripheral - connecting to their UART service.")
+        for connection in ble.connections:
+            if UARTService not in connection:
+                continue
+            return connection[UARTService]
+
+#--------------------------
+# The main application loop
+#--------------------------
+while True:
+
+    # Establish initial connection
+    uart = scan_and_connect()
+
+    print("Connected.")
+
+    code = ''
+    in_label.text = out_label.text = ' '*18
+    edit_label.text = ' '*4
+    done = False
+
+    # Run the chat while connected
+    while ble.connected:
+
+        # Check for incoming message
+        incoming_bytes = uart.in_waiting
+        if incoming_bytes:
+            bytes_in = uart.read(incoming_bytes)
+            print("Received: ", bytes_in)
+            in_label.text = in_label.text[incoming_bytes:] + bytes_in.decode()
+
+        # DOT (or done)
+        if clue.button_a:
+            start = time.monotonic()
+            while time.monotonic() - start < WAIT_FOR_DOUBLE:
+                if clue.button_b:
+                    done = True
+            if not done and len(code) < 4:
+                print('.', end='')
+                code += '.'
+                edit_label.text = "{:4s}".format(code)
+                time.sleep(DEBOUNCE)
+
+        # DASH (or done)
+        if clue.button_b:
+            start = time.monotonic()
+            while time.monotonic() - start < WAIT_FOR_DOUBLE:
+                if clue.button_a:
+                    done = True
+            if not done and len(code) < 4:
+                print('-', end='')
+                code += '-'
+                edit_label.text = "{:4s}".format(code)
+                time.sleep(DEBOUNCE)
+
+        # Turn Morse Code into letter and send
+        if done:
+            letter = morse_code.get(code, ' ')
+            print(' >', letter)
+            out_label.text = out_label.text[1:] + letter
+            uart.write(str.encode(letter))
+            code = ''
+            edit_label.text = ' '*4
+            done = False
+            time.sleep(DEBOUNCE)
+
+    print("Disconnected.")