micropython 蓝牙键盘

Micropython可以通过使用内置的`bluetooth`库来实现蓝牙功能。要将Micropython设备设置为蓝牙键盘，您需要使用`bluetooth`库中的`HIDDevice`类来模拟HID设备。以下是一个简单的示例代码，可以将Micropython设备设置为蓝牙键盘并发送按键事件：

import bluetooth
from micropython import const

# 定义HID键盘的一些常量
KEY_LEFT_CTRL = const(0x01)
KEY_LEFT_SHIFT = const(0x02)
KEY_A = const(0x04)
KEY_B = const(0x05)
KEY_C = const(0x06)

# 定义HID消息类型的常量
REPORT_MAP = bytes((
    0x05, 0x01,  # Usage Page (Generic Desktop Ctrls)
    0x09, 0x06,  # Usage (Keyboard)
    0xA1, 0x01,  # Collection (Application)
    0x85, 0x01,  # Report ID (1)
    0x05, 0x07,  # Usage Page (Key Codes)
    0x19, 0xE0,  # Usage Minimum (224)
    0x29, 0xE7,  # Usage Maximum (231)
    0x15, 0x00,  # Logical Minimum (0)
    0x25, 0x01,  # Logical Maximum (1)
    0x75, 0x01,  # Report Size (1)
    0x95, 0x08,  # Report Count (8)
    0x81, 0x02,  # Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0x95, 0x01,  # Report Count (1)
    0x75, 0x08,  # Report Size (8)
    0x81, 0x01,  # Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0x95, 0x05,  # Report Count (5)
    0x75, 0x01,  # Report Size (1)
    0x05, 0x08,  # Usage Page (LEDs)
    0x19, 0x01,  # Usage Minimum (1)
    0x29, 0x05,  # Usage Maximum (5)
    0x91, 0x02,  # Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
    0x95, 0x01,  # Report Count (1)
    0x75, 0x03,  # Report Size (3)
    0x91, 0x01,  # Output (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
    0x95, 0x06,  # Report Count (6)
    0x75, 0x08,  # Report Size (8)
    0x15, 0x00,  # Logical Minimum (0)
    0x25, 0x65,  # Logical Maximum (101)
    0x05, 0x07,  # Usage Page (Key Codes)
    0x19, 0x00,  # Usage Minimum (0)
    0x29, 0x65,  # Usage Maximum (101)
    0x81, 0x00,  # Input (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0xC0,  # End Collection
))

# 定义HID设备类
class HIDDevice:
    def __init__(self, psm=17, report_map=REPORT_MAP):
        self.report_map = report_map
        self.psm = psm
        self.sdp_record = None
        self.advertising = False
        self.socket = None

    # 创建并绑定蓝牙socket
    def bind(self):
        self.socket = bluetooth.BluetoothSocket(bluetooth.L2CAP)
        self.socket.bind(("", self.psm))

    # 开始广告
    def advertise(self, name="HID"):
        self.sdp_record = bluetooth.SDPRecord.create(
            0x10001,
            {
                0x0100: name,
                0x0001: self.report_map,
            },
        )
        bluetooth.advertise_service(
            self.socket,
            name=name,
            service_id=self.sdp_record.service_id,
            service_classes=[bluetooth.SERIAL_PORT_CLASS],
            profiles=[bluetooth.SERIAL_PORT_PROFILE],
            # protocol=bluetooth.L2CAP,
        )
        self.advertising = True

    # 停止广告
    def stop_advertising(self):
        bluetooth.stop_advertising(self.socket)
        self.advertising = False

    # 发送按键事件
    def send_key(self, key):
        data = bytearray(8)
        data[0] = KEY_LEFT_CTRL
        data[2] = key
        self.socket.send(bytes(data))

    # 模拟按键组合
    def send_key_combination(self, key1, key2):
        data = bytearray(8)
        data[0] = KEY_LEFT_CTRL | KEY_LEFT_SHIFT
        data[2] = key1
        data[3] = key2
        self.socket.send(bytes(data))

# 创建一个HID设备实例并开始广告
hid_device = HIDDevice()
hid_device.bind()
hid_device.advertise()

# 发送按键事件
hid_device.send_key(KEY_A)

请注意，此示例仅演示了如何将Micropython设备设置为蓝牙键盘，并发送按键事件。您需要根据自己的需求修改代码，并实现其他功能，例如模拟按键组合、发送多个按键事件等。