Nordic之蓝牙拍照/播放音乐_蓝牙hid 控制相机拍照-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_65036647/article/details/143135215

用蓝牙实现拍照或者播放/暂停音乐主要是通过蓝牙模块连接手机，蓝牙上通过GPIO检测按键输入，发送HID报告到手机上，HID报告格式都是按照HID固定的协议来解析的。

我使用的是nrf52832蓝牙板，打开官方例程下的nRF5_SDK_17.1.0_ddde560\examples\ble_peripheral\ble_app_hids_mouse\pca10040\s132例程，这个例程实际上是实现的鼠标移动的事件，将鼠标事件改成拍照/音乐播放事件就可以了，一下是我在上面例程中修改的代码

    static uint8_t rep_map_data[] =
    {
        0x05, 0x01, // Usage Page (Generic Desktop)
        0x09, 0x02, // Usage (Mouse)

        0xA1, 0x01, // Collection (Application)

        // Report ID 1: Mouse buttons + scroll/pan
        0x85, 0x01,       // Report Id 1
        0x09, 0x01,       // Usage (Pointer)
        0xA1, 0x00,       // Collection (Physical)
        0x95, 0x05,       // Report Count (3)
        0x75, 0x01,       // Report Size (1)
        0x05, 0x09,       // Usage Page (Buttons)
        0x19, 0x01,       // Usage Minimum (01)
        0x29, 0x05,       // Usage Maximum (05)
        0x15, 0x00,       // Logical Minimum (0)
        0x25, 0x01,       // Logical Maximum (1)
        0x81, 0x02,       // Input (Data, Variable, Absolute)
        0x95, 0x01,       // Report Count (1)
        0x75, 0x03,       // Report Size (3)
        0x81, 0x01,       // Input (Constant) for padding
        0x75, 0x08,       // Report Size (8)
        0x95, 0x01,       // Report Count (1)
        0x05, 0x01,       // Usage Page (Generic Desktop)
        0x09, 0x38,       // Usage (Wheel)
        0x15, 0x81,       // Logical Minimum (-127)
        0x25, 0x7F,       // Logical Maximum (127)
        0x81, 0x06,       // Input (Data, Variable, Relative)
        0x05, 0x0C,       // Usage Page (Consumer)
        0x0A, 0x38, 0x02, // Usage (AC Pan)
        0x95, 0x01,       // Report Count (1)
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0xC0,             // End Collection (Physical)

        // Report ID 2: Mouse motion
        0x85, 0x02,       // Report Id 2
        0x09, 0x01,       // Usage (Pointer)
        0xA1, 0x00,       // Collection (Physical)
        0x75, 0x0C,       // Report Size (12)
        0x95, 0x02,       // Report Count (2)
        0x05, 0x01,       // Usage Page (Generic Desktop)
        0x09, 0x30,       // Usage (X)
        0x09, 0x31,       // Usage (Y)
        0x16, 0x01, 0xF8, // Logical maximum (2047)
        0x26, 0xFF, 0x07, // Logical minimum (-2047)
        0x81, 0x06,       // Input (Data, Variable, Relative)
        0xC0,             // End Collection (Physical)
        0xC0,             // End Collection (Application)

        // Report ID 3: Advanced buttons
        0x05, 0x0C,       // Usage Page (Consumer)
        0x09, 0x01,       // Usage (Consumer Control)
        0xA1, 0x01,       // Collection (Application)
        0x85, 0x03,       // Report Id (3)
        0x15, 0x00,       // Logical minimum (0)
        0x25, 0x01,       // Logical maximum (1)
        0x75, 0x01,       // Report Size (1)
        0x95, 0x01,       // Report Count (1)

        0x09, 0xCD,       // Usage (Play/Pause) 开始/暂停 0x01
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0x0A, 0x83, 0x01, // Usage (AL Consumer Control Configuration) 一键启动应用 0x02
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0x09, 0xB5,       // Usage (Scan Next Track) 下一首 0x04
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0x09, 0xB6,       // Usage (Scan Previous Track) 上一首 0x04
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)

        0x09, 0xEA,       // Usage (Volume Down) 音量- 0x10
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0x09, 0xE9,       // Usage (Volume Up) 音量+ 0x20
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0x0A, 0x25, 0x02, // Usage (AC Forward) 应用控制 0x40
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0x0A, 0x24, 0x02, // Usage (AC Back) 返回键 0x80
        0x81, 0x06,       // Input (Data,Value,Relative,Bit Field)
        0xC0              // End Collection
    };
//上面这个表是hids_init()函数里面的hid的映射表 这个表的格式是HID协议定义的，需要什么功能都可以根据HID report的格式加入

/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    qwr_init();
//    dis_init();
//    bas_init();
    hids_init();
}


//发送对应的HID报告到手机上
static void key_volume_send(uint8_t control)
{
	uint8_t buffer[INPUT_REP_MEDIA_PLAY_LEN];

	//按下键
	buffer[0] = control;
	send_press_or_relase_key(buffer);
  
	//释放键
	buffer[0] = 0;
	send_press_or_relase_key(buffer);
}

/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
static void bsp_event_handler(bsp_event_t event)
{
    ret_code_t err_code;

    switch (event)
    {
        case BSP_EVENT_SLEEP:
            sleep_mode_enter();
            break;

        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            if (m_conn_handle == BLE_CONN_HANDLE_INVALID)
            {
                err_code = ble_advertising_restart_without_whitelist(&m_advertising);
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
            }
            break;

        case BSP_EVENT_KEY_0:
            if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
            {
							key_volume_send(0x20);//音量+
            }
            break;

        case BSP_EVENT_KEY_1:
            if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
            {
							key_volume_send(0x10);//音量-
            }
            break;

        case BSP_EVENT_KEY_2:
            if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
            {
							key_volume_send(0x01);//开始/暂停
            }
            break;

        case BSP_EVENT_KEY_3:
            if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
            {
							key_volume_send(0x04);//下一首
            }
            break;

        default:
            break;
    }
}

大家感兴趣也可以更多的去了解一下HID类下的如手柄，蓝牙遥控器，这些都还是很有趣的，原理都差不多。

记录自己的学习收获，有不足请大佬指正，感谢！！！