YD_WeChatApplet/pages/bluetooth/bluetooth.js

Page({
  data: {
    devices: [],
    isSearching: false,
    status: '未连接',
    connected: false,
    skipCount: 0,
    connectedDeviceId: null,
    deviceServices: [],
    deviceCharacteristics: []
  },

  // 1. 初始化蓝牙模块
  startBluetooth() {
    wx.openBluetoothAdapter({
      success: () => {
        console.log('蓝牙初始化成功');
        wx.showToast({ title: '蓝牙已开启', icon: 'success' });
      },
      fail: (res) => {
        console.error('蓝牙初始化失败', res);
        wx.showModal({
          title: '提示',
          content: '请打开手机蓝牙并授权小程序使用',
          showCancel: false,
        });
      }
    });
  },

  // 2. 搜索设备
  searchDevices() {
    this.setData({ isSearching: true, devices: [] });

    // 启动搜索
    wx.startBluetoothDevicesDiscovery({
      allowDuplicatesKey: false,
      success: () => {
        console.log('开始搜索设备');
        // 监听发现设备事件
        wx.onBluetoothDeviceFound((res) => {
          console.log('发现新设备', res.devices);
          res.devices.forEach(device => {
            if (device.name || device.localName) {
              const exists = this.data.devices.find(d => d.deviceId === device.deviceId);
              if (!exists) {
                this.setData({
                  devices: [...this.data.devices, device]
                });
              }
            }
          });
        });
      },
      fail: (err) => {
        console.error('搜索设备失败', err);
        wx.showToast({ title: '搜索失败', icon: 'error' });
        this.setData({ isSearching: false });
      }
    });

    // 设置超时自动停止
    setTimeout(() => {
      wx.stopBluetoothDevicesDiscovery();
      this.setData({ isSearching: false });
      console.log('停止搜索');
    }, 10000); // 10秒后停止
  },

  // 3. 连接设备
  connectDevice(e) {
    const device = e.currentTarget.dataset.device;
    console.log('尝试连接设备', device);

    wx.createBLEConnection({
      deviceId: device.deviceId,
      success: () => {
        console.log('连接成功', device.deviceId);
        this.setData({
          status: '已连接',
          connected: true,
          connectedDeviceId: device.deviceId
        });

        // 获取设备的服务
        this.getDeviceServices(device.deviceId);
      },
      fail: (err) => {
        console.error('连接失败', err);
        wx.showToast({ title: '连接失败', icon: 'error' });
      }
    });
  },

  // 获取设备的服务
  getDeviceServices(deviceId) {
    wx.getBLEDeviceServices({
      deviceId: deviceId,
      success: (res) => {
        console.log('设备服务', res.services);
        this.setData({
          deviceServices: res.services
        });

        // 获取第一个服务的特征值
        if (res.services.length > 0) {
          this.getDeviceCharacteristics(deviceId, res.services[0].uuid);
        }
      },
      fail: (err) => {
        console.error('获取服务失败', err);
      }
    });
  },

  // 获取第一个服务的特征值
  getDeviceCharacteristics(deviceId, serviceId) {
    wx.getBLEDeviceCharacteristics({
      deviceId: deviceId,
      serviceId: serviceId,
      success: (res) => {
        console.log('服务特征值', res.characteristics);
        this.setData({
          deviceCharacteristics: res.characteristics
        });

        // 启动接收数据通知
        this.startNotify(deviceId, serviceId);

        // 发送启动自由跳绳的命令
        this.startFreeJumpRope(deviceId, serviceId);
      },
      fail: (err) => {
        console.error('获取特征值失败', err);
      }
    });
  },

  // 启动接收数据通知
  startNotify(deviceId, serviceId) {
    const characteristics = this.data.deviceCharacteristics;
    characteristics.forEach(characteristic => {
      if (characteristic.properties.notify) {
        wx.notifyBLECharacteristicValueChange({
          deviceId: deviceId,
          serviceId: serviceId,
          characteristicId: characteristic.uuid,
          state: true,
          success: () => {
            console.log('启动数据通知');
          },
          fail: (err) => {
            console.error('启动通知失败', err);
          }
        });
        // 接收数据
        wx.onBLECharacteristicValueChange((res) => {
          console.log('接收到数据', res.value);
          if (res.deviceId === deviceId && res.characteristicId === characteristic.uuid) {
            console.log('接收到数据', res.value);
            this.handleReceivedData(res.value);
          }
        });
      }
    });
  },

  // 发送启动自由跳绳命令
  startFreeJumpRope(deviceId, serviceId) {
    const command = 3;    // 启动自由跳绳的命令
    const code = 1;  
    const parameter = 0;   // 启动自由跳绳，参数为0
    // 获取蓝牙设备的特征值（特征值应是你已经连接的蓝牙设备的写入特征值）
    const characteristic = this.data.deviceCharacteristics.find(c => c.properties.write);
    if (!characteristic) {
      console.error('没有可写的特征值');
      return;
    }
    // 构建命令数据
    const commandData = new ArrayBuffer(4); 
    const dataView = new DataView(commandData);
    dataView.setUint8(0, 0x03); 
    dataView.setUint8(1, 0x01); 
    dataView.setUint8(2, 0x00); 
    dataView.setUint8(3, 0x00); 
    
    // 发送命令到设备
    wx.writeBLECharacteristicValue({
      deviceId: deviceId,
      serviceId: serviceId,
      characteristicId: characteristic.uuid,
      value: commandData,
      success: () => {
        console.log("自由跳绳已启动！");
      },
      fail: (error) => {
        console.error("启动自由跳绳失败", error);
      }
    });
  },
  // 处理接收到的数据
  handleReceivedData(arrayBuffer) {
    // 1. 创建 Int16Array 视图（从 ArrayBuffer 读取）
    const int16Array = new Int16Array(arrayBuffer);
    // 2. 检查长度是否足够（至少 3 个元素）
    if (int16Array.length < 3) {
        console.error("Int16Array length is too short!");
        return;
    }
    // 3. 读取索引 2 的值
    const value = int16Array[2];
    // 4. 更新数据
    this.setData({ skipCount: value });
},

  // 4. 断开连接
  disconnectDevice() {
    wx.closeBLEConnection({
      deviceId: this.data.connectedDeviceId,
      success: () => {
        console.log('断开连接');
        this.setData({
          status: '未连接',
          connected: false
        });
      }
    });
  }
});