ch573 cc2540 central 事件
转自:https://blog.csdn.net/xiaoleiacmer/article/details/42554605
BLE协议栈Central 工程中与广播连接建立的事件
最近在改写BLE协议栈,需要实现实时发现周边从设备,并建立连接,获取RSSI的功能,没什么难度,但着实将各个事件好好看了一遍。曾经看到一位大神说相同的任务使用事件触发方式,不同的任务使用消息传递方式。冥冥之中突然来了感觉~
BLE进行广播和建立连接的事件主要实现是在simpleBLECentralEventCB的回调函数中:
所有使用到的变量都在联合体gapCentralRoleEvent_t中:
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typedef union
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{
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gapEventHdr_t gap; //!< GAP_MSG_EVENT and status.
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gapDeviceInitDoneEvent_t initDone; //!< GAP initialization done. 本机信息
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gapDeviceInfoEvent_t deviceInfo;//!< Discovery device information event structure. 从机信息
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gapDevDiscEvent_t discCmpl;//!< Discovery complete event structure.从机信息(全部)
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gapEstLinkReqEvent_t linkCmpl; //!< Link complete event structure.
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gapLinkUpdateEvent_t linkUpdate; //!< Link update event structure.
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gapTerminateLinkEvent_t linkTerminate; //!< Link terminated event structure.
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} gapCentralRoleEvent_t; // central.h
1 板级初始化事件:GAP_DEVICE_INIT_DONE_EVENT
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case GAP_DEVICE_INIT_DONE_EVENT: // 初始化 // 是本机GAP层的初始化信息 在运行到GAPCentralRole_StartDevice函数被回调
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{
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LCD_WRITE_STRING( bdAddr2Str( pEvent->initDone.devAddr ), HAL_LCD_LINE_2 );
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}
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break;
详解:
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作用:进行GAP层的初始化
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详解:
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/**
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* GAP_DEVICE_INIT_DONE_EVENT message format. This message is sent to the
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* app when the Device Initialization is done [initiated by calling
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* GAP_DeviceInit()]. gap.h
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*/
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typedef struct
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{
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osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
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uint8 opcode; //!< GAP_DEVICE_INIT_DONE_EVENT
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uint8 devAddr[B_ADDR_LEN]; //!< Device's BD_ADDR 本机的MAC地址
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uint16 dataPktLen; //!< HC_LE_Data_Packet_Length 初始化长度为27
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uint8 numDataPkts; //!< HC_Total_Num_LE_Data_Packets 初始化为4
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} gapDeviceInitDoneEvent_t;
2 搜索从机事件(每搜到一个从机进入一次):GAP_DEVICE_INFO_EVENT
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case GAP_DEVICE_INFO_EVENT: //过程量 从机的广播数据 搜索到之后添加到从机列表中
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{
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char temprssiarg[4]={0};
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// if filtering device discovery results based on service UUID
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if ( DEFAULT_DEV_DISC_BY_SVC_UUID == TRUE )
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{
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if ( simpleBLEFindSvcUuid( SIMPLEPROFILE_SERV_UUID,
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pEvent->deviceInfo.pEvtData,
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pEvent->deviceInfo.dataLen ) )
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{
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simpleBLEAddDeviceInfo( pEvent->deviceInfo.addr, pEvent->deviceInfo.addrType );
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}
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}
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}
作用: 每搜索到一个从设备时,都会进入该事件,并使用simpleBLEAddDeviceInfo加入到扫描结果列表中,deviceInfo.addr中储存着当前正被扫描到从设备地址,扫描从机的数量(simpleBLEScanRes)在simpleBLEAddDeviceInfo中增加!
详解:
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**
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* GAP_DEVICE_INFO_EVENT message format. This message is sent to the
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* app during a Device Discovery Request, when a new advertisement or scan
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* response is received. //gap.h
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*/
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typedef struct
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{
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osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
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uint8 opcode; //!< GAP_DEVICE_INFO_EVENT
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uint8 eventType; //!< Advertisement Type: @ref GAP_ADVERTISEMENT_TYPE_DEFINES
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uint8 addrType; //!< address type: @ref GAP_ADDR_TYPE_DEFINES
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uint8 addr[B_ADDR_LEN]; //!< Address of the advertisement or SCAN_RSP 从机MAC地址
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int8 rssi; //!< Advertisement or SCAN_RSP RSSI 从机RSSI值
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uint8 dataLen; //!< Length (in bytes) of the data field (evtData)
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uint8 *pEvtData; //!< Data field of advertisement or SCAN_RSP
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} gapDeviceInfoEvent_t;
3 搜索从机事件(搜索完毕时进入一次):GAP_DEVICE_DISCOVERY_EVENT
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case GAP_DEVICE_DISCOVERY_EVENT: //结果量 // 搜索周边广播从机事件 显示搜索结果
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{
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// discovery complete
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simpleBLEScanning = FALSE;
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// if not filtering device discovery results based on service UUID
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if ( DEFAULT_DEV_DISC_BY_SVC_UUID == FALSE )
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{
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// Copy results
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simpleBLEScanRes = pEvent->discCmpl.numDevs;
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osal_memcpy( simpleBLEDevList, pEvent->discCmpl.pDevList,
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(sizeof( gapDevRec_t ) * pEvent->discCmpl.numDevs) );
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}
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char temp_simpleBLEScanRes[10]="Find : \n";
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FineDeviceNum=FindDeviceNum=simpleBLEScanRes;//***************************************************************** 扫描的数量
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temp_simpleBLEScanRes[8] = simpleBLEScanRes+'0';
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Uart0Send_String(temp_simpleBLEScanRes,10);//***********************************
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/******************************************************************************************************/
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// initialize scan index to last device
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simpleBLEScanIdx = simpleBLEScanRes;
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IsPeriodicStart=1;
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-
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}
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break;
作用:程序运行到这一步可以知道当前有多少个已经被扫描到的从设备,且它们的地址被保存到simpleBLEDevList里。
搜索结果列表 // Scan result list
static gapDevRec_t simpleBLEDevList[DEFAULT_MAX_SCAN_RES]; // 扫描结果列表
详解:
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/**
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* Type of device discovery (Scan) to perform.
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*/
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typedef struct
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{
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uint8 eventType;
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//!< Indicates advertising event type used by the advertiser: @ref GAP_ADVERTISEMENT_TYPE_DEFINES
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uint8 addrType; //!< Address Type: @ref GAP_ADDR_TYPE_DEFINES
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uint8 addr[B_ADDR_LEN]; //!< Device's Address // 储存着当前搜索到的设备地址 最大可见扫描数量8
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} gapDevRec_t; 搜索结果结构体
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/**
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* GAP_DEVICE_DISCOVERY_EVENT message format. This message is sent to the
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* Application after a scan is performed.
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*/
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typedef struct
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{
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osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
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uint8 opcode; //!< GAP_DEVICE_DISCOVERY_EVENT
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uint8 numDevs; //!< Number of devices found during scan
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gapDevRec_t *pDevList; //!< array of device records
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} gapDevDiscEvent_t; 搜索结果事件结构体
Note: 需要知道一个从设备的RSSI值,只需知道从设备的MAC地址信息在simpleBLEDevList中即可!
4 连接建立事件:GAP_LINK_ESTABLISHED_EVENT
本事件里开起一个定时器,事件连接超时断开!
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case GAP_LINK_ESTABLISHED_EVENT:
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{
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if ( pEvent->gap.hdr.status == SUCCESS )
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{
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simpleBLEState = BLE_STATE_CONNECTED;
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simpleBLEConnHandle = pEvent->linkCmpl.connectionHandle;
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simpleBLEProcedureInProgress = TRUE;
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// If service discovery not performed initiate service discovery
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if ( simpleBLECharHdl == 0 )
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{
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osal_start_timerEx( simpleBLETaskId, START_DISCOVERY_EVT, DEFAULT_SVC_DISCOVERY_DELAY );
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}
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// SerialPrintString("Connected: ");
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// Uart0Send_String( bdAddr2Str( pEvent->linkCmpl.devAddr ), sizeof(bdAddr2Str( pEvent->linkCmpl.devAddr )));
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// for(int i=0;i<10000;i++);
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for(int i=0;i<10000;i++);
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LCD_WRITE_STRING( bdAddr2Str( pEvent->linkCmpl.devAddr ), HAL_LCD_LINE_2 );
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for(int i=0;i<10000;i++);
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// Uart0Send_String("12222",5);
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//LCD_WRITE_STRING( "Connected", HAL_LCD_LINE_1 );
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/*********** 2015年1月8日 不间断的搜寻周围的从设备 ************** 建立连接后读取当前的RSSI 值***********************************************************************************************/
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if ( simpleBLEState == BLE_STATE_CONNECTED )
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{
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if ( !simpleBLERssi )
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{
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simpleBLERssi = TRUE;
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GAPCentralRole_StartRssi( simpleBLEConnHandle, DEFAULT_RSSI_PERIOD );
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}
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else
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{
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simpleBLERssi = FALSE;
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GAPCentralRole_CancelRssi( simpleBLEConnHandle );
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LCD_WRITE_STRING( "RSSI Cancelled", HAL_LCD_LINE_1 );
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// SerialPrintString("RSSI Cancelled\r\n");
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}
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}
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/****************************************************************************************************************/
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}
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else
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{
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simpleBLEState = BLE_STATE_IDLE;
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simpleBLEConnHandle = GAP_CONNHANDLE_INIT;
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simpleBLERssi = FALSE;
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simpleBLEDiscState = BLE_DISC_STATE_IDLE;
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LCD_WRITE_STRING( "Connect Failed", HAL_LCD_LINE_1 );
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// SerialPrintString("Connect Failed: ");
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LCD_WRITE_STRING_VALUE( "Reason:", pEvent->gap.hdr.status, 10, HAL_LCD_LINE_2 );
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GAPCentralRole_CancelRssi( simpleBLEConnHandle );
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/*********** 2015年1月8日 不间断的搜寻周围的从设备 ************** 连接错误 主机从新进行搜索***********************************************************************************************/
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simpleBLEScanning = TRUE;
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simpleBLEScanRes = 0;
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LCD_WRITE_STRING( "Discovering...", HAL_LCD_LINE_1 );
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LCD_WRITE_STRING( "", HAL_LCD_LINE_2 );
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GAPCentralRole_StartDiscovery( DEFAULT_DISCOVERY_MODE,
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DEFAULT_DISCOVERY_ACTIVE_SCAN,
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DEFAULT_DISCOVERY_WHITE_LIST );
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/*****************************************************************************************************/
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// SerialPrintValue("Reason:", pEvent->gap.hdr.status,10);
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}
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}
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break;
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详解:
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/**
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* GAP_LINK_ESTABLISHED_EVENT message format. This message is sent to the app
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* when the link request is complete.<BR>
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* <BR>
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* For an Observer, this message is sent to complete the Establish Link Request.<BR>
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* For a Peripheral, this message is sent to indicate that a link has been created.
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*/
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typedef struct
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{
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osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
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uint8 opcode; //!< GAP_LINK_ESTABLISHED_EVENT
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uint8 devAddrType; //!< Device address type: @ref GAP_ADDR_TYPE_DEFINES
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uint8 devAddr[B_ADDR_LEN]; //!< Device address of link
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uint16 connectionHandle; //!< Connection Handle from controller used to ref the device
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uint16 connInterval; //!< Connection Interval
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uint16 connLatency; //!< Conenction Latency
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uint16 connTimeout; //!< Connection Timeout
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uint8 clockAccuracy; //!< Clock Accuracy
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} gapEstLinkReqEvent_t;
5 连接超时事件 : GAP_LINK_TERMINATED_EVENT
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case GAP_LINK_TERMINATED_EVENT:
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{
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simpleBLEState = BLE_STATE_IDLE;
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simpleBLEConnHandle = GAP_CONNHANDLE_INIT;
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simpleBLERssi = FALSE;
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simpleBLEDiscState = BLE_DISC_STATE_IDLE;
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simpleBLECharHdl = 0;
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simpleBLEProcedureInProgress = FALSE;
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LCD_WRITE_STRING( "Disconnected", HAL_LCD_LINE_1 );
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// SerialPrintString("Disconnected: ");
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LCD_WRITE_STRING_VALUE( "Reason:", pEvent->linkTerminate.reason,
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10, HAL_LCD_LINE_2 );
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// SerialPrintValue("Reason:", pEvent->linkTerminate.reason,10);
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}

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