zigbee学习:示例程序SampleApp中通讯流程
本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.
参考链接:
http://wjf88223.blog.163.com/blog/static/3516800120104711268760/
http://www.cnblogs.com/yqh2007/archive/2011/04/27/2030062.html
环境：
主机:WIN7
开发环境:IAR8.10.3
MCU:CC2530
示例程序:SampleApp
说明:
在此示例程序中,有两种通讯方式:
1.每个设备每隔5s,会发送广播信息
2.按下向上键,设备会向组1发送信息
如果按下向右键,可以加入或退出组1
代码分析:
1.在main()->osal_init_system()->osalInitTasks()中增加示例程序任务SampleApp_Init( taskID )
此函数代码:
void SampleApp_Init( uint8 task_id )
{
SampleApp_TaskID = task_id;
SampleApp_NwkState = DEV_INIT;
SampleApp_TransID = 0;
// Device hardware initialization can be added here or in main() (Zmain.c).
// If the hardware is application specific - add it here.
// If the hardware is other parts of the device add it in main().
#if defined ( BUILD_ALL_DEVICES )
// The "Demo" target is setup to have BUILD_ALL_DEVICES and HOLD_AUTO_START
// We are looking at a jumper (defined in SampleAppHw.c) to be jumpered
// together - if they are - we will start up a coordinator. Otherwise,
// the device will start as a router.
if ( readCoordinatorJumper() )
zgDeviceLogicalType = ZG_DEVICETYPE_COORDINATOR;
else
zgDeviceLogicalType = ZG_DEVICETYPE_ROUTER;
#endif // BUILD_ALL_DEVICES
#if defined ( HOLD_AUTO_START )
// HOLD_AUTO_START is a compile option that will surpress ZDApp
// from starting the device and wait for the application to
// start the device.
ZDOInitDevice(0);
#endif
// Setup for the periodic message's destination address
// Broadcast to everyone
SampleApp_Periodic_DstAddr.addrMode = (afAddrMode_t)AddrBroadcast;
SampleApp_Periodic_DstAddr.endPoint = SAMPLEAPP_ENDPOINT;
SampleApp_Periodic_DstAddr.addr.shortAddr = 0xFFFF;
// Setup for the flash command's destination address - Group 1
SampleApp_Flash_DstAddr.addrMode = (afAddrMode_t)afAddrGroup;
SampleApp_Flash_DstAddr.endPoint = SAMPLEAPP_ENDPOINT;
SampleApp_Flash_DstAddr.addr.shortAddr = SAMPLEAPP_FLASH_GROUP;
// Fill out the endpoint description.
SampleApp_epDesc.endPoint = SAMPLEAPP_ENDPOINT;
SampleApp_epDesc.task_id = &SampleApp_TaskID;
SampleApp_epDesc.simpleDesc
= (SimpleDescriptionFormat_t *)&SampleApp_SimpleDesc;
SampleApp_epDesc.latencyReq = noLatencyReqs;
// Register the endpoint description with the AF
afRegister( &SampleApp_epDesc );
// Register for all key events - This app will handle all key events
RegisterForKeys( SampleApp_TaskID );
// By default, all devices start out in Group 1
SampleApp_Group.ID = 0x0001;
osal_memcpy( SampleApp_Group.name, "Group 1", 7 );
aps_AddGroup( SAMPLEAPP_ENDPOINT, &SampleApp_Group );
#if defined ( LCD_SUPPORTED )
HalLcdWriteString( "SampleApp", HAL_LCD_LINE_1 );
#endif
}
2.任务数组tasksArr[]中增加示例程序任务:
// The order in this table must be identical to the task initialization calls below in osalInitTask.
const pTaskEventHandlerFn tasksArr[] = {
macEventLoop,
nwk_event_loop,
Hal_ProcessEvent,
#if defined( MT_TASK )
MT_ProcessEvent,
#endif
APS_event_loop,
#if defined ( ZIGBEE_FRAGMENTATION )
APSF_ProcessEvent,
#endif
ZDApp_event_loop,
#if defined ( ZIGBEE_FREQ_AGILITY ) || defined ( ZIGBEE_PANID_CONFLICT )
ZDNwkMgr_event_loop,
#endif
SampleApp_ProcessEvent
};
3.任务处理函数SampleApp_ProcessEvent()解析
源代码:
uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )
{
afIncomingMSGPacket_t *MSGpkt;
(void)task_id; // Intentionally unreferenced parameter
if ( events & SYS_EVENT_MSG )
{
MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
while ( MSGpkt )
{
switch ( MSGpkt->hdr.event )
{
// Received when a key is pressed
case KEY_CHANGE:
SampleApp_HandleKeys( ((keyChange_t *)MSGpkt)->state, ((keyChange_t *)MSGpkt)->keys );
break;
// Received when a messages is received (OTA) for this endpoint
case AF_INCOMING_MSG_CMD:
SampleApp_MessageMSGCB( MSGpkt );
break;
// Received whenever the device changes state in the network
case ZDO_STATE_CHANGE:
SampleApp_NwkState = (devStates_t)(MSGpkt->hdr.status);
if ( (SampleApp_NwkState == DEV_ZB_COORD)
|| (SampleApp_NwkState == DEV_ROUTER)
|| (SampleApp_NwkState == DEV_END_DEVICE) )
{
// Start sending the periodic message in a regular interval.
osal_start_timerEx( SampleApp_TaskID,
SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT );
}
else
{
// Device is no longer in the network
}
break;
default:
break;
}
// Release the memory
osal_msg_deallocate( (uint8 *)MSGpkt );
// Next - if one is available
MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
}
// return unprocessed events
return (events ^ SYS_EVENT_MSG);
}
// Send a message out - This event is generated by a timer
// (setup in SampleApp_Init()).
if ( events & SAMPLEAPP_SEND_PERIODIC_MSG_EVT )
{
// Send the periodic message
SampleApp_SendPeriodicMessage();
// Setup to send message again in normal period (+ a little jitter)
osal_start_timerEx( SampleApp_TaskID, SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
(SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT + (osal_rand() & 0x00FF)) );
// return unprocessed events
return (events ^ SAMPLEAPP_SEND_PERIODIC_MSG_EVT);
}
// Discard unknown events
return 0;
}
解析:
问:KEY_CHANGE事件如何在SampleApp_ProcessEvent()函数产生?
答:SampleApp_Init()函数注册了事件RegisterForKeys( SampleApp_TaskID );
问:AF_INCOMING_MSG_CMD事件如何在SampleApp_ProcessEvent()函数产生?
答:SampleApp_Init()函数注册了事件afRegister( &SampleApp_epDesc );
以下为系统处理来自AF层数据包的大致流程:
afIncomingData() ->afBuildMSGIncoming()->osal_msg_send() -> osal_set_event()
根据task_id调用事件处理函数SampleApp_ProcessEvent(),在此函数中判断具体事件类型再调用相应回调函数如SampleApp_MessageMSGCB()
问:ZDO_STATE_CHANGE事件如何在SampleApp_ProcessEvent()函数产生?
答:网络状态改变会引发函数ZDO_UpdateNwkStatus()的处理,此函数中产生应用任务数据
osal_msg_send( *(epDesc->epDesc->task_id), (byte *)msgPtr ); //发往应用任务
4.信息发送过程
步骤:
1).设备连接网络,网络状态改变,产生事件ZDO_STATE_CHANGE
在任务处理函数SampleApp_ProcessEvent()中产生一个定时器命令:
osal_start_timerEx( SampleApp_TaskID,
SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT );
2).事件到后,发送信息,并且再度启动定时器
if ( events & SAMPLEAPP_SEND_PERIODIC_MSG_EVT )
{
// Send the periodic message
SampleApp_SendPeriodicMessage();
// Setup to send message again in normal period (+ a little jitter)
osal_start_timerEx( SampleApp_TaskID, SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
(SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT + (osal_rand() & 0x00FF)) );
// return unprocessed events
return (events ^ SAMPLEAPP_SEND_PERIODIC_MSG_EVT);
}
3).SampleApp_SendPeriodicMessage()函数源代码:
void SampleApp_SendPeriodicMessage( void )
{
if ( AF_DataRequest( &SampleApp_Periodic_DstAddr, &SampleApp_epDesc,
SAMPLEAPP_PERIODIC_CLUSTERID,
1,
(uint8*)&SampleAppPeriodicCounter,
&SampleApp_TransID,
AF_DISCV_ROUTE,
AF_DEFAULT_RADIUS ) == afStatus_SUCCESS )
{
}
else
{
// Error occurred in request to send.
}
}
此函数调用 AF_DataRequest()函数向组1发送命令
5.退出和加入组1是通过RIGHT按键实现,按键处理源代码:
void SampleApp_HandleKeys( uint8 shift, uint8 keys )
{
(void)shift; // Intentionally unreferenced parameter
if ( keys & HAL_KEY_SW_1 )
{
/* This key sends the Flash Command is sent to Group 1.
* This device will not receive the Flash Command from this
* device (even if it belongs to group 1).
*/
SampleApp_SendFlashMessage( SAMPLEAPP_FLASH_DURATION );
}
if ( keys & HAL_KEY_SW_2 )
{
/* The Flashr Command is sent to Group 1.
* This key toggles this device in and out of group 1.
* If this device doesn't belong to group 1, this application
* will not receive the Flash command sent to group 1.
*/
aps_Group_t *grp;
grp = aps_FindGroup( SAMPLEAPP_ENDPOINT, SAMPLEAPP_FLASH_GROUP );
if ( grp )
{
// Remove from the group
aps_RemoveGroup( SAMPLEAPP_ENDPOINT, SAMPLEAPP_FLASH_GROUP );
}
else
{
// Add to the flash group
aps_AddGroup( SAMPLEAPP_ENDPOINT, &SampleApp_Group );
}
}
}