2640r2f simple_perial 怎样定时发送20个字节的蓝牙数据

蓝牙从机向主机发送信息可以通过notification或者indication，在simpleBLEPeripheral工程里面，可调用GATTServApp_ProcessCharCfg()来进行发送，具体请看代码：

/*-------------------------------------------------------------------
 * GATT Server Sub-Procedure APIs
 */

/**
 * @brief   Send a GATT Indication
 *
 * This sub-procedure is used when a server is configured to
 * indicate a characteristic value to a client and expects an
 * attribute protocol layer acknowledgement that the indication
 * was successfully received.
 *
 * @ref ATT_HandleValueInd is used in this sub-procedure.
 *
 * @par Corresponding Events
 * If the return status from this function is @ref SUCCESS and the GATT client
 * succesfully sends an acknowledgement,  the calling
 * application task will receive a @ref GATT_MSG_EVENT message with method:
 * @ref ATT_HANDLE_VALUE_CFM of type @ref attHandleValueInd_t , with
 * status @ref SUCCESS or @ref bleTimeout . At this point, the procedure
 * is complete.
 *
 * @warning The payload must be dynamically allocated using @ref GATT_bm_alloc
 *
 * @note The client must use @ref GATT_RegisterForInd in order to receive
 * Indications in the application task and use
 * @ref ATT_HandleValueCfm to return the acknowledgement to the server
 *
 * @param   connHandle - connection to use
 * @param   pInd - pointer to indication to be sent
 * @param   authenticated - whether an authenticated link is required
 *                          0x01: LE Legacy authenticated
 *                          0x02: Secure Connections authenticated
 * @param   taskId - task to be notified of response
 *
 * @return  @ref SUCCESS : Indication was queued successfully.
 * @return  @ref INVALIDPARAMETER
 * @return  @ref MSG_BUFFER_NOT_AVAIL
 * @return  @ref bleNotConnected
 * @return  @ref blePending : A confirmation is pending with this client.
 * @return  @ref bleMemAllocError
 * @return  @ref bleInvalidMtuSize : Packet length is larger than connection's MTU size.
 * @return  @ref bleTimeout : Previous transaction timed out.
 */
extern bStatus_t GATT_Indication( uint16 connHandle, attHandleValueInd_t *pInd,
                                  uint8 authenticated, uint8 taskId );

/**
 * @brief   Send a GATT Notification
 *
 * This sub-procedure is used when a server is configured to
 * notify a characteristic value to a client without expecting
 * any attribute protocol layer acknowledgement that the
 * notification was successfully received.
 *
 * @ref ATT_HandleValueNoti is used in this sub-procedure.
 *
 * @note
 * A notification may be sent at any time.
 * No confirmation will be sent to the calling task for
 * this sub-procedure.
 *
 * @warning The payload must be dynamically allocated using @ref GATT_bm_alloc
 *
 * @note The client must use @ref GATT_RegisterForInd in order to receive
 * Notifications in the application task
 *
 * @param   connHandle - connection to use
 * @param   pNoti - pointer to notification to be sent
 * @param   authenticated - whether an authenticated link is required
 *                          0x01: LE Legacy authenticated
 *                          0x02: Secure Connections authenticated
 *
 * @return  @ref SUCCESS : Notification was queued successfully.
 * @return  @ref INVALIDPARAMETER
 * @return  @ref MSG_BUFFER_NOT_AVAIL
 * @return  @ref bleNotConnected
 * @return  @ref bleMemAllocError
 * @return  @ref bleInvalidMtuSize : Packet length is larger than connection's MTU size.
 * @return  @ref bleTimeout : Previous transaction timed out.
 */
extern bStatus_t GATT_Notification( uint16 connHandle, attHandleValueNoti_t *pNoti,
                                    uint8 authenticated );

/*********************************************************************
 * @fn      GATTServApp_ProcessCharCfg
 *
 * @brief   Process Client Characteristic Configuration change.
 *
 * @param   charCfgTbl - characteristic configuration table.
 * @param   pValue - pointer to attribute value.
 * @param   authenticated - whether an authenticated link is required.
 * @param   attrTbl - attribute table.
 * @param   numAttrs - number of attributes in attribute table.
 * @param   taskId - task to be notified of confirmation.
 * @param   pfnReadAttrCB - read callback function pointer.
 *
 * @return  Success or Failure
 */
bStatus_t GATTServApp_ProcessCharCfg( gattCharCfg_t *charCfgTbl, uint8 *pValue,
                                      uint8 authenticated, gattAttribute_t *attrTbl,
                                      uint16 numAttrs, uint8 taskId,
                                      pfnGATTReadAttrCB_t pfnReadAttrCB )
{
  uint8 i;
  bStatus_t status = SUCCESS;

  // Verify input parameters
  if ( ( charCfgTbl == NULL ) || ( pValue == NULL ) ||
       ( attrTbl == NULL )    || ( pfnReadAttrCB == NULL ) )
  {
    return ( INVALIDPARAMETER );
  }

  for ( i = 0; i < linkDBNumConns; i++ )
  {
    gattCharCfg_t *pItem = &(charCfgTbl[i]);

    if ( ( pItem->connHandle != CONNHANDLE_INVALID ) &&
         ( pItem->value != GATT_CFG_NO_OPERATION ) )
    {
      gattAttribute_t *pAttr;

      // Find the characteristic value attribute
      pAttr = GATTServApp_FindAttr( attrTbl, numAttrs, pValue );
      if ( pAttr != NULL )
      {
        if ( pItem->value & GATT_CLIENT_CFG_NOTIFY )
        {
           status |= gattServApp_SendNotiInd( pItem->connHandle, GATT_CLIENT_CFG_NOTIFY,
                                              authenticated, pAttr, taskId, pfnReadAttrCB );
        }

        if ( pItem->value & GATT_CLIENT_CFG_INDICATE )
        {
           status |= gattServApp_SendNotiInd( pItem->connHandle, GATT_CLIENT_CFG_INDICATE,
                                              authenticated, pAttr, taskId, pfnReadAttrCB );
        }
      }
    }
  } // for

  return ( status );
}