Merge pull request adafruit#1025 from caternuson/candy_hearts_ble

Add BLE candy hearts code

Author: ladyada

TFT_Gizmo_Candy_Hearts/candy_heart_ble.py

@@ -0,0 +1,104 @@
+# Display stuff
+import displayio
+import adafruit_imageload
+from adafruit_bitmap_font import bitmap_font
+from adafruit_display_text import label
+from adafruit_gizmo import tft_gizmo
+# BLE stuff
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
+from adafruit_bluefruit_connect.packet import Packet
+from adafruit_bluefruit_connect.color_packet import ColorPacket
+
+#---| User Config |--------------------------------------------------
+BLE_NAME = "Candy Heart"
+MESSAGE_DELIMITER = ","
+MESSAGE_COLOR = 0xFF0000
+#---| User Config |--------------------------------------------------
+
+# Setup BLE radio and service
+ble = BLERadio()
+uart = UARTService()
+advertisement = ProvideServicesAdvertisement(uart)
+ble._adapter.name = BLE_NAME #pylint: disable=protected-access
+
+# Create the TFT Gizmo display
+display = tft_gizmo.TFT_Gizmo()
+
+# Load the candy heart BMP
+bitmap, palette = adafruit_imageload.load("/heart_bw.bmp",
+                                          bitmap=displayio.Bitmap,
+                                          palette=displayio.Palette)
+
+heart = displayio.TileGrid(bitmap, pixel_shader=palette)
+
+# Set up message text
+LINE1_MAX = 9
+LINE2_MAX = 5
+font = bitmap_font.load_font("/Multicolore_36.bdf")
+line1 = label.Label(font, text="?"*LINE1_MAX)
+line2 = label.Label(font, text="?"*LINE2_MAX)
+line1.anchor_point = (0.5, 0)    # middle top
+line2.anchor_point = (0.5, 1.0)  # middle bottom
+line1.anchored_position = (120, 85)
+line2.anchored_position = (120, 175)
+line1.color = line2.color = MESSAGE_COLOR
+
+# Set up group and add to display
+group = displayio.Group()
+group.append(heart)
+group.append(line1)
+group.append(line2)
+display.show(group)
+
+def update_heart(message, heart_color):
+    # turn off auto refresh while we change some things
+    display.auto_refresh = False
+    # set message text
+    text1, _, text2 = message.partition(MESSAGE_DELIMITER)
+    line1.text = text1[:LINE1_MAX] if len(text1) > LINE1_MAX else text1
+    line2.text = text1[:LINE2_MAX] if len(text2) > LINE2_MAX else text2
+    # update location for new text bounds
+    line1.anchored_position = (120, 85)
+    line2.anchored_position = (120, 175)
+    # set heart color
+    palette[1] = heart_color
+    # OK, now turn auto refresh back on to display
+    display.auto_refresh = True
+
+# Initial update
+text = "TEXT,ME"
+color = 0x00FFFF
+update_heart(text, color)
+
+# Loop forever
+while True:
+    # advertise and wait for connection
+    print("WAITING...")
+    ble.start_advertising(advertisement)
+    while not ble.connected:
+        pass
+
+    # connected
+    print("CONNECTED")
+    ble.stop_advertising()
+
+    # receive and handle BLE traffic
+    while ble.connected:
+        if uart.in_waiting:
+            raw_bytes = uart.read(uart.in_waiting)
+            if raw_bytes[0] == ord('!'):
+            # BLE Connect Control Packet
+                packet = Packet.from_bytes(raw_bytes)
+                if isinstance(packet, ColorPacket):
+                    print("color = ", color)
+                    color = packet.color
+            else:
+            # Just plain text
+                text = raw_bytes.decode("utf-8").strip()
+                print("text = ", text)
+            update_heart(text, color)
+
+    # disconnected
+    print("DISCONNECTED")