继续捣鼓蓝牙功能，今天我们就实现一个标准的电量服务，并实现Notify功能

继续在上一篇的工程修改，由于Notify功能需要定时发送，我们先来配置一下定时器2作为Notify定时发送的中断源

打开对应中断

添加一个服务，里面一个特征，这个服务参考标准电量服务进行配置

生成代码，打开app_conf.h添加一个新的任务ID

typedef enum
{
  CFG_TASK_BLE_STACK,
  CFG_TASK_VTIMER,
  CFG_TASK_NVM,
  /* USER CODE BEGIN CFG_Task_Id_t */
CFG_TASK_BATTERY_NOTIF,
  /* USER CODE END CFG_Task_Id_t */
  CFG_TASK_NBR,  /**< Shall be LAST in the list */
} CFG_Task_Id_t;

打开battery_app.c进行修改，注册CFG_TASK_BATTERY_NOTIF任务

void BATTERY_APP_Init(void)
{
  BATTERY_APP_Context.ConnectionHandle = 0xFFFF;
  BATTERY_Init();

  /* USER CODE BEGIN Service2_APP_Init */
    UTIL_SEQ_RegTask( 1U << CFG_TASK_BATTERY_NOTIF, UTIL_SEQ_RFU, BATTERY_Batterylevel_SendNotification);

    BATTERY_APP_Context.Batterylevel_Notification_Status = Batterylevel_NOTIFICATION_OFF;
  /* USER CODE END Service2_APP_Init */
  return;
}

填充回调函数

void BATTERY_Notification(BATTERY_NotificationEvt_t *p_Notification)
{
  /* USER CODE BEGIN Service2_Notification_1 */

  /* USER CODE END Service2_Notification_1 */
  switch(p_Notification->EvtOpcode)
  {
    /* USER CODE BEGIN Service2_Notification_Service2_EvtOpcode */

    /* USER CODE END Service2_Notification_Service2_EvtOpcode */

    case BATTERY_BATTERYLEVEL_READ_EVT:
      /* USER CODE BEGIN Service2Char1_READ_EVT */
      /* USER CODE END Service2Char1_READ_EVT */
      break;

    case BATTERY_BATTERYLEVEL_NOTIFY_ENABLED_EVT:
      /* USER CODE BEGIN Service2Char1_NOTIFY_ENABLED_EVT */
        BATTERY_APP_Context.Batterylevel_Notification_Status = Batterylevel_NOTIFICATION_ON;
      /* USER CODE END Service2Char1_NOTIFY_ENABLED_EVT */
      break;

    case BATTERY_BATTERYLEVEL_NOTIFY_DISABLED_EVT:
      /* USER CODE BEGIN Service2Char1_NOTIFY_DISABLED_EVT */
        BATTERY_APP_Context.Batterylevel_Notification_Status = Batterylevel_NOTIFICATION_OFF;
      /* USER CODE END Service2Char1_NOTIFY_DISABLED_EVT */
      break;

    default:
      /* USER CODE BEGIN Service2_Notification_default */

      /* USER CODE END Service2_Notification_default */
      break;
  }
  /* USER CODE BEGIN Service2_Notification_2 */

  /* USER CODE END Service2_Notification_2 */
  return;
}

实现Notify发送

__USED void BATTERY_Batterylevel_SendNotification(void) /* Property Notification */
{
  BATTERY_APP_SendInformation_t notification_on_off = Batterylevel_NOTIFICATION_OFF;
  BATTERY_Data_t battery_notification_data;

  battery_notification_data.p_Payload = (uint8_t*)a_BATTERY_UpdateCharData;
  battery_notification_data.Length = 0;

  /* USER CODE BEGIN Service2Char1_NS_1*/
    a_BATTERY_UpdateCharData[0] = 50;
    battery_notification_data.Length = 1;
    notification_on_off = BATTERY_APP_Context.Batterylevel_Notification_Status;
  /* USER CODE END Service2Char1_NS_1*/

  if (notification_on_off != Batterylevel_NOTIFICATION_OFF && BATTERY_APP_Context.ConnectionHandle != 0xFFFF)
  {
    BATTERY_NotifyValue(BATTERY_BATTERYLEVEL, &battery_notification_data, BATTERY_APP_Context.ConnectionHandle);
  }

  /* USER CODE BEGIN Service2Char1_NS_Last*/

  /* USER CODE END Service2Char1_NS_Last*/

  return;
}

修改中断回调函数，加入请求执行CFG_TASK_BATTERY_NOTIF任务

void TIM2_IRQHandler(void)
{
  /* USER CODE BEGIN TIM2_IRQn 0 */

  /* USER CODE END TIM2_IRQn 0 */
  HAL_TIM_IRQHandler(&htim2);
  /* USER CODE BEGIN TIM2_IRQn 1 */
  UTIL_SEQ_SetTask(1U << CFG_TASK_BATTERY_NOTIF, CFG_SEQ_PRIO_0);

  /* USER CODE END TIM2_IRQn 1 */
}

编译下载，连接蓝牙后即可看到标准的电量服务

点击接收通知，即可看到蓝牙设备发来的电量信息

具体通信数据