CC2541之按键服务

注：宏 应包括 HAL_KEY=TRUE

1.注册按键服务

/*********************************************************************
 * Keyboard Register function
 *
 * The keyboard handler is setup to send all keyboard changes to
 * one task (if a task is registered).
 *
 * If a task registers, it will get all the keys. You can change this
 * to register for individual keys.
 *********************************************************************/
uint8 RegisterForKeys( uint8 task_id )
{
  // Allow only the first task
  if ( registeredKeysTaskID == NO_TASK_ID )
  {
    registeredKeysTaskID = task_id;
    return ( true );
  }
  else
    return ( false );
}

2.在应用程序的事件处理函数中调用按键事件系统信息处理函数（按下按键时系统会产生对应的osal事件信息）

  // SYS_EVENT_MSG 这是系统事件比如按键事件蓝牙读写事件处理，都会置这个事件
  if ( events & SYS_EVENT_MSG )
  {
    uint8 *pMsg;

    if ( (pMsg = osal_msg_receive( SimpleBLETest_TaskID )) != NULL )
    {
      simpleBLECentral_ProcessOSALMsg( (osal_event_hdr_t *)pMsg ); //调用按键事件系统信息处理函数

      // Release the OSAL message
      VOID osal_msg_deallocate( pMsg );
    }

    // return unprocessed events
    return (events ^ SYS_EVENT_MSG);
  }

3.按键事件系统信息处理函数调用对按键信息具体实现函数

/*********************************************************************
 * @fn      simpleBLECentral_ProcessOSALMsg
 *
 * @brief   Process an incoming task message.
 *
 * @param   pMsg - message to process
 *
 * @return  none
 */
static void simpleBLECentral_ProcessOSALMsg( osal_event_hdr_t *pMsg )
{
  switch ( pMsg->event )
  {
    case KEY_CHANGE:
      simpleBLECentral_HandleKeys( ((keyChange_t *)pMsg)->state, ((keyChange_t *)pMsg)->keys );//调用具体实现函数
      break;

    default:
      break;
  }
}

4.按键事件具体实现函数

/*********************************************************************
 * @fn      simpleBLECentral_HandleKeys
 *
 * @brief   Handles all key events for this device.
 *
 * @param   shift - true if in shift/alt.
 * @param   keys - bit field for key events. Valid entries:
 *                 HAL_KEY_SW_2
 *                 HAL_KEY_SW_1
 *
 * @return  none
 */
static void simpleBLECentral_HandleKeys( uint8 shift, uint8 keys )
{
  (void)shift;  // Intentionally unreferenced parameter

  if ( keys & HAL_KEY_SW_6 )
  {
	printf("按键S1\n");
  }

  if ( keys & HAL_KEY_UP )
  {  
	printf("按键 上\n");
  }

  if ( keys & HAL_KEY_LEFT )
  {
	printf("按键 左\n");
  }

  if ( keys & HAL_KEY_RIGHT )
  {
	printf("按键 右\n");
  }
  
  if ( keys & HAL_KEY_CENTER )
  {
	printf("按键 中间\n");

  }
  
  if ( keys & HAL_KEY_DOWN )
  {
	printf("按键 下\n");
  }
}