Merge pull request adafruit#999 from jedgarpark/cpb-keybutton-ble

first commit ble hid keybutton code

Author: dhalbert

CPB_Keybutton_BLE/cpb_keybutton_ble.py

@@ -0,0 +1,77 @@
+"""
+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
+            #print("back")  # for debug in REPL
+            k.send(Keycode.BACKSPACE)
+            time.sleep(0.1)
+
+        if not button_2.value:
+            kl.write("Bluefruit")  # use keyboard_layout for words
+            time.sleep(0.4)
+
+        if not button_3.value:
+            k.send(Keycode.SHIFT, Keycode.L)  # add shift modifier
+            time.sleep(0.4)
+
+        if not button_4.value:
+            kl.write("e")
+            time.sleep(0.4)
+
+        if not button_5.value:
+            k.send(Keycode.ENTER)
+            time.sleep(0.4)
+
+    ble.start_advertising(advertisement)