选择从节点，数据通信部分代码

1 选择从节点，建立连接

 1 if ( !simpleBLEScanning && simpleBLEScanRes > 0)
 2          {
 3             simpleBLEScanIdx++;
 4             if ( simpleBLEScanIdx >= simpleBLEScanRes )
 5             {
 6                 simpleBLEScanIdx = 0;
 7             }
 8         uint8 addrType;
 9       uint8 *peerAddr；
10
11         if ( simpleBLEScanRes > 0 )
12         {
13            peerAddr = simpleBLEDevList[simpleBLEScanIdx].addr;
14            addrType = simpleBLEDevList[simpleBLEScanIdx].addrType;
15
16            simpleBLEState = BLE_STATE_CONNECTING;
17
18            GAPCentralRole_EstablishLink( DEFAULT_LINK_HIGH_DUTY_CYCLE,
19                                          DEFAULT_LINK_WHITE_LIST,
20                                          addrType, peerAddr );//发起连接建立请求
21 }

连接好以后调用simpleBLECentralEventCB——>GAP_DEVICE_DISCOVERY_EVENT

1 LCD_WRITE_STRING_VALUE( "Devices Found", simpleBLEScanRes,
2                                 10, HAL_LCD_LINE_1 );
3         if ( simpleBLEScanRes > 0 )
4         {
5           LCD_WRITE_STRING( "<- To Select", HAL_LCD_LINE_2 );
6
7         }

2 主节点向从节点通信

主节点向特征值6中写入要传输数据：

1 attWriteReq_t req;
2
3         req.handle = 0x0035; //特征值6的handle
4         req.len = 15; //value的长度为15，这要和从节点匹配好
5         req.value[0] = 0x00;
6         req.sig = 0;
7         req.cmd = 0;
8
9            GATT_WriteCharValue( simpleBLEConnHandle, &req, simpleBLETaskId ); 

从节点在simpleProfileChangeCB——>SIMPLEPROFILE_CHAR6中接收：

1 case SIMPLEPROFILE_CHAR6:      //特征值6
2       char newchar[15];
3       SimpleProfile_GetParameter( SIMPLEPROFILE_CHAR6, &newchar );
4
5       HalUARTWrite(0,&newchar[0],15);
6
7
8       break;

注意handle值设对，长度匹配在simpleGATTprofile.h中设好:

1 // Length of Characteristic 5 in bytes
2 #define SIMPLEPROFILE_CHAR5_LEN           5
3 #define SIMPLEPROFILE_CHAR6_LEN           15
4 #define SIMPLEPROFILE_CHAR7_LEN           15

3 从节点向主节点通信

从节点主动传输：

 1 static attHandleValueNoti_t pReport ;//声明attHandleValueNoti_t这个结构体
 2    uint16 noti_cHandle; //存放handle
 3
 4    pReport.handle = 0x2E; //特征值4的handle
 5    //pReport.handle = simpleProfileAttrTbl[11].handle;//读取notification对应的handle，不知道为什么不好使？？
 6    GAPRole_GetParameter( 0x30E, &noti_cHandle);//获取Connection Handle
 7    pReport.len = 16;//数据长度
 8
 9    pReport.value[0] =0x01;//赋值
10    pReport.value[1] =0x02;
11    GATT_Notification(noti_cHandle,&pReport,FALSE);
12   

主节点在simpleBLECentralProcessGATTMsg中接收：

1  else if ( ( pMsg->method == ATT_HANDLE_VALUE_NOTI ) )   //通知
2   {
3     if( pMsg->msg.handleValueNoti.handle == 0x002E)   //CHAR4的通知  串口打印
4     {
5
6
7        HalUARTWrite(0,&pMsg->msg.handleValueNoti.value[0],16 );
8 }

网上说主节点需要先使能通知char4才能接收notification，但我现在的程序可以直接接收，不知道为什么？？