import supervisor import usb_hid from micropython import const from storage import getmount from kmk.keys import FIRST_KMK_INTERNAL_KEY, ConsumerKey, ModifierKey, MouseKey from kmk.utils import clamp try: from adafruit_ble import BLERadio from adafruit_ble.advertising.standard import ProvideServicesAdvertisement from adafruit_ble.services.standard.hid import HIDService except ImportError: # BLE not supported on this platform pass class HIDModes: NOOP = 0 # currently unused; for testing? USB = 1 BLE = 2 ALL_MODES = (NOOP, USB, BLE) class HIDReportTypes: KEYBOARD = 1 MOUSE = 2 CONSUMER = 3 SYSCONTROL = 4 class HIDUsage: KEYBOARD = 0x06 MOUSE = 0x02 CONSUMER = 0x01 SYSCONTROL = 0x80 class HIDUsagePage: CONSUMER = 0x0C KEYBOARD = MOUSE = SYSCONTROL = 0x01 HID_REPORT_SIZES = { HIDReportTypes.KEYBOARD: 8, HIDReportTypes.MOUSE: 4, HIDReportTypes.CONSUMER: 2, HIDReportTypes.SYSCONTROL: 8, # TODO find the correct value for this } class AbstractHID: REPORT_BYTES = 8 def __init__(self, **kwargs): self._prev_evt = bytearray(self.REPORT_BYTES) self._evt = bytearray(self.REPORT_BYTES) self.report_device = memoryview(self._evt)[0:1] self.report_device[0] = HIDReportTypes.KEYBOARD # Landmine alert for HIDReportTypes.KEYBOARD: byte index 1 of this view # is "reserved" and evidently (mostly?) unused. However, other modes (or # at least consumer, so far) will use this byte, which is the main reason # this view exists. For KEYBOARD, use report_mods and report_non_mods self.report_keys = memoryview(self._evt)[1:] self.report_mods = memoryview(self._evt)[1:2] self.report_non_mods = memoryview(self._evt)[3:] self._cc_report = bytearray(HID_REPORT_SIZES[HIDReportTypes.CONSUMER] + 1) self._cc_report[0] = HIDReportTypes.CONSUMER self._cc_pending = False self._pd_report = bytearray(HID_REPORT_SIZES[HIDReportTypes.MOUSE] + 1) self._pd_report[0] = HIDReportTypes.MOUSE self._pd_pending = False self.post_init() def __repr__(self): return f'{self.__class__.__name__}(REPORT_BYTES={self.REPORT_BYTES})' def post_init(self): pass def create_report(self, keys_pressed, axes): self.clear_all() for key in keys_pressed: if key.code >= FIRST_KMK_INTERNAL_KEY: continue if isinstance(key, ModifierKey): self.add_modifier(key) elif isinstance(key, ConsumerKey): self.add_cc(key) elif isinstance(key, MouseKey): self.add_pd(key) else: self.add_key(key) if key.has_modifiers: for mod in key.has_modifiers: self.add_modifier(mod) for axis in axes: self.move_axis(axis) def hid_send(self, evt): # Don't raise a NotImplementedError so this can serve as our "dummy" HID # when MCU/board doesn't define one to use (which should almost always be # the CircuitPython-targeting one, except when unit testing or doing # something truly bizarre. This will likely change eventually when Bluetooth # is added) pass def send(self): if self._evt != self._prev_evt: self._prev_evt[:] = self._evt self.hid_send(self._evt) if self._cc_pending: self.hid_send(self._cc_report) self._cc_pending = False if self._pd_pending: self.hid_send(self._pd_report) self._pd_pending = False return self def clear_all(self): for idx, _ in enumerate(self.report_keys): self.report_keys[idx] = 0x00 self.remove_cc() self.remove_pd() self.clear_axis() return self def clear_non_modifiers(self): for idx, _ in enumerate(self.report_non_mods): self.report_non_mods[idx] = 0x00 return self def add_modifier(self, modifier): if isinstance(modifier, ModifierKey): if modifier.code == ModifierKey.FAKE_CODE: for mod in modifier.has_modifiers: self.report_mods[0] |= mod else: self.report_mods[0] |= modifier.code else: self.report_mods[0] |= modifier return self def remove_modifier(self, modifier): if isinstance(modifier, ModifierKey): if modifier.code == ModifierKey.FAKE_CODE: for mod in modifier.has_modifiers: self.report_mods[0] ^= mod else: self.report_mods[0] ^= modifier.code else: self.report_mods[0] ^= modifier return self def add_key(self, key): # Try to find the first empty slot in the key report, and fill it placed = False where_to_place = self.report_non_mods for idx, _ in enumerate(where_to_place): if where_to_place[idx] == 0x00: where_to_place[idx] = key.code placed = True break if not placed: # TODO what do we do here?...... pass return self def remove_key(self, key): where_to_place = self.report_non_mods for idx, _ in enumerate(where_to_place): if where_to_place[idx] == key.code: where_to_place[idx] = 0x00 return self def add_cc(self, cc): # Add (or write over) consumer control report. There can only be one CC # active at any time. memoryview(self._cc_report)[1:3] = cc.code.to_bytes(2, 'little') self._cc_pending = True def remove_cc(self): # Remove consumer control report. report = memoryview(self._cc_report)[1:3] if report != b'\x00\x00': report[:] = b'\x00\x00' self._cc_pending = True def add_pd(self, key): self._pd_report[1] |= key.code self._pd_pending = True def remove_pd(self): if self._pd_report[1]: self._pd_pending = True self._pd_report[1] = 0x00 def move_axis(self, axis): delta = clamp(axis.delta, -127, 127) axis.delta -= delta self._pd_report[axis.code + 2] = 0xFF & delta self._pd_pending = True def clear_axis(self): for idx in range(2, len(self._pd_report)): self._pd_report[idx] = 0x00 class USBHID(AbstractHID): REPORT_BYTES = 9 def post_init(self): self.devices = {} for device in usb_hid.devices: us = device.usage up = device.usage_page if up == HIDUsagePage.CONSUMER and us == HIDUsage.CONSUMER: self.devices[HIDReportTypes.CONSUMER] = device continue if up == HIDUsagePage.KEYBOARD and us == HIDUsage.KEYBOARD: self.devices[HIDReportTypes.KEYBOARD] = device continue if up == HIDUsagePage.MOUSE and us == HIDUsage.MOUSE: self.devices[HIDReportTypes.MOUSE] = device continue if up == HIDUsagePage.SYSCONTROL and us == HIDUsage.SYSCONTROL: self.devices[HIDReportTypes.SYSCONTROL] = device continue def hid_send(self, evt): if not supervisor.runtime.usb_connected: return # int, can be looked up in HIDReportTypes reporting_device_const = evt[0] return self.devices[reporting_device_const].send_report( evt[1 : HID_REPORT_SIZES[reporting_device_const] + 1] ) class BLEHID(AbstractHID): BLE_APPEARANCE_HID_KEYBOARD = const(961) # Hardcoded in CPy MAX_CONNECTIONS = const(2) def __init__(self, ble_name=str(getmount('/').label), **kwargs): self.ble_name = ble_name super().__init__() def post_init(self): self.ble = BLERadio() self.ble.name = self.ble_name self.hid = HIDService() self.hid.protocol_mode = 0 # Boot protocol # Security-wise this is not right. While you're away someone turns # on your keyboard and they can pair with it nice and clean and then # listen to keystrokes. # On the other hand we don't have LESC so it's like shouting your # keystrokes in the air if not self.ble.connected or not self.hid.devices: self.start_advertising() @property def devices(self): '''Search through the provided list of devices to find the ones with the send_report attribute.''' if not self.ble.connected: return {} result = {} for device in self.hid.devices: if not hasattr(device, 'send_report'): continue us = device.usage up = device.usage_page if up == HIDUsagePage.CONSUMER and us == HIDUsage.CONSUMER: result[HIDReportTypes.CONSUMER] = device continue if up == HIDUsagePage.KEYBOARD and us == HIDUsage.KEYBOARD: result[HIDReportTypes.KEYBOARD] = device continue if up == HIDUsagePage.MOUSE and us == HIDUsage.MOUSE: result[HIDReportTypes.MOUSE] = device continue if up == HIDUsagePage.SYSCONTROL and us == HIDUsage.SYSCONTROL: result[HIDReportTypes.SYSCONTROL] = device continue return result def hid_send(self, evt): if not self.ble.connected: return # int, can be looked up in HIDReportTypes reporting_device_const = evt[0] device = self.devices[reporting_device_const] report_size = len(device._characteristic.value) while len(evt) < report_size + 1: evt.append(0) return device.send_report(evt[1 : report_size + 1]) def clear_bonds(self): import _bleio _bleio.adapter.erase_bonding() def start_advertising(self): if not self.ble.advertising: advertisement = ProvideServicesAdvertisement(self.hid) advertisement.appearance = self.BLE_APPEARANCE_HID_KEYBOARD self.ble.start_advertising(advertisement) def stop_advertising(self): self.ble.stop_advertising()