CC2541/CC2640 如何实现一主多从

首先由于芯片自身问题导致CC2541 可以最多一主三从 ，CC2640可以一主八从。

 我们这里以CC2541为例子

1.扫描从机保存从机mac地址

//首先主机需要去扫描设备
GAPCentralRole_StartDiscovery( DEFAULT_DISCOVERY_MODE, DEFAULT_DISCOVERY_ACTIVE_SCAN, DEFAULT_DISCOVERY_WHITE_LIST )
//当扫描完成会进入
GAP_DEVICE_DISCOVERY_EVENT
//请查看
uint16 SimpleBLECentral_ProcessEvent( uint8 task_id, uint16 events ) 
｛
   case GAP_DEVICE_DISCOVERY_EVENT:
      {
        // discovery complete
        simpleBLEScanning = FALSE;

        // if not filtering device discovery results based on service UUID
        if ( DEFAULT_DEV_DISC_BY_SVC_UUID == FALSE )
        {
          // Copy results
          simpleBLEScanRes = pEvent->discCmpl.numDevs;
          osal_memcpy( simpleBLEDevList, pEvent->discCmpl.pDevList,
                       (sizeof( gapDevRec_t ) * pEvent->discCmpl.numDevs) );
        }
}

2.建立链接，通过上面的程序我们可以把从机的信息保存下来并保存链接句柄

uint8 addrType;  
uint8 *peerAddr;  


simpleBLEScanIdx = devMacResult[0];  


// connect to current device in scan result   
peerAddr = simpleBLEDevList[simpleBLEScanIdx].addr;  
addrType = simpleBLEDevList[simpleBLEScanIdx].addrType;  


simpleBLEState = BLE_STATE_CONNECTING;  


GAPCentralRole_EstablishLink( DEFAULT_LINK_HIGH_DUTY_CYCLE,  
			DEFAULT_LINK_WHITE_LIST,  
			addrType, peerAddr );  

//在GAP_LINK_ESTABLISHED_EVENT事件中保存连接的handle：
MultiConnHandle[num]=ppEvent->linkCmpl.connectionHandle;

3.保存后的句柄可以用于数据的发送以及特征值的读写，连接的断开

attWriteReq_t req;  

req.handle = BLE_NotifyChar_Handle+1;  
req.len = 1;  
req.value[0] = 0x01;  
req.sig = 0;  
req.cmd = 0;  
status = GATT_WriteCharValue( MultiConnHandle[0], &req, simpleBLETaskId ); 
GAPCentralRole_TerminateLink( MultiConnHandle[0]);  

4.附上TI提供的多路连接的例程链接：


http://processors.wiki.ti.com/index.php/Cc2640_MultiRole_Demo
processors.wiki.ti.com/.../File:SimpleBLEMulti_patch.zip