如果使用HOLD_AUTO_START选项,那么本工程就会禁止自动启动ZDApp事件处理循环中的ZDO_NETWORK_INIT事件,也就是上电后不自动调用ZDOInitDevice(),需要通过外部事件,或者用户自己调用这个函数,下面我们看看定义了这个函数后,程序的流程是怎么样的。
在ZDApp.c文件中,可以看到下面的定义:
#if defined( HOLD_AUTO_START )
devStates_t devState = DEV_HOLD; // 初始化-不会自动启动
#else
devStates_t devState = DEV_INIT; //初始化-没有连接到任何东西
#endif
#if defined( ZDO_COORDINATOR ) && !defined( SOFT_START )
// Set the default to coodinator
devStartModes_t devStartMode = MODE_HARD;
#else
devStartModes_t devStartMode = MODE_JOIN; // Assume joining
//devStartModes_t devStartMode = MODE_RESUME; // if already "directly joined"
// to parent. Set to make the device do an Orphan scan.
#endif
#if !defined( ZDO_COORDINATOR ) || defined( SOFT_START )
static uint8 retryCnt;
#endif
在调用用户自己定义的任务初始化函数之前,调用下面的初始函数,看看这里怎么处理,devState状态的。
void ZDApp_Init( byte task_id )
{
uint8 capabilities;
// Save the task ID
ZDAppTaskID = task_id;
// Initialize the ZDO global device short address storage
ZDAppNwkAddr.addrMode = Addr16Bit;
ZDAppNwkAddr.addr.shortAddr = INVALID_NODE_ADDR;
(void)NLME_GetExtAddr(); // Load the saveExtAddr pointer. 加载IEEE地址
// Check for manual "Hold Auto Start"
//打开电源时,检测到有手工设置SW_1则会设置devState = DEV_HOLD,从而不进行网络初始化
ZDAppCheckForHoldKey();
// Initialize ZDO items and setup the device - type of device to create.
ZDO_Init(); //初始化ZDO条目,并设置设备的启动方式是协调器,还是别的
// Register the endpoint description with the AF
// This task doesn't have a Simple description, but we still need
// to register the endpoint.
afRegister( (endPointDesc_t *)&ZDApp_epDesc );
#if defined( ZDO_USERDESC_RESPONSE )
ZDApp_InitUserDesc();
#endif // ZDO_USERDESC_RESPONSE
// set broadcast address mask to support broadcast filtering
NLME_GetRequest(nwkCapabilityInfo, 0, &capabilities);
NLME_SetBroadcastFilter( capabilities );
// Start the device? 是否启动设备?如果devState不是DEV_HOLD时,则启动设备,在上面的代码分析中,也可以看到,如果定义了HOLD_AUTO_START宏,则devState等于DEV_HOLD,不会启动设备。如果按下了SW_1键devState也等于DEV_HOLD,也不会启动网络。也就是说有两种方式可以设置非自动启动模式,一种是通过按键,一种通过宏定义
if ( devState != DEV_HOLD )
{
ZDOInitDevice( 0 );
}
else
{
//如果定义了HOLD_AUTO_START,则等待延时或外部事件启动网络,并且LED4灯,也就是蓝色的灯闪烁
// Blink LED to indicate HOLD_START
HalLedBlink ( HAL_LED_4, 0, 50, 500 );
}
ZDApp_RegisterCBs();
} /* ZDO_Init() */
void ZDAppCheckForHoldKey( void )
{
#if (defined HAL_KEY) && (HAL_KEY == TRUE)
//通过判断按键来决定是否采用HOLD_AUTO_START方式。当按下SW_BYPASS_START按键,也就是SW1键,将避开自动启动设备,也就是设置 devState = DEV_HOLD
// Get Keypad directly to see if a HOLD_START is needed.
// Hold down the SW_BYPASS_START key (see OnBoard.h)
// while booting to avoid starting up the device.
if ( HalKeyRead () == SW_BYPASS_START)
{
// Change the device state to HOLD on start up
devState = DEV_HOLD;
}
#endif // HAL_KEY
}
说明:(1)这里HAL_KEY的初始化在hal_board_cfg.h文件中:
#ifndef HAL_KEY
#define HAL_KEY TRUE
#endif
而对SW_BYPASS_START的初始化在OnBoard.h文件中:
// These Key definitions are unique to this development system.
// They are used to bypass functions when starting up the device.
//这些键的定义仅适用于本应用例子,可以在设备启动时避开一些功能:
//避开网络层的NV存储和避开网络初始化
#define SW_BYPASS_NV HAL_KEY_SW_5 // Bypass Network layer NV restore
#define SW_BYPASS_START HAL_KEY_SW_1 // Bypass Network initialization
因此避开网络层NV存储也可以通过手工方式来完成.
//根据编译选项来设置;比如SimpleApp中的灯节点,预编译了ZDO_COORDINATOR和REFLECTOR和SOFT_START,因此会根据这些来选择开启一些函数功能.
void ZDO_Init( void )
{
// Initialize ZD items REFLECTOR如果定义了这个编译选项则使用“源绑定”,
#if defined ( REFLECTOR )
ZDO_EDBind = NULL;
#endif
// Setup the device - type of device to create.
ZDODeviceSetup();
}
static void ZDODeviceSetup( void )
{
#if defined( ZDO_COORDINATOR ) //如果定义了协调器,协调器初始化
NLME_CoordinatorInit();
#endif
#if defined ( REFLECTOR ) //如果定义了COORDINATOR_BINDING 绑定时使用
#if defined ( ZDO_COORDINATOR )//定义了REFLECTOR,且定义了协调器
APS_ReflectorInit( APS_REFLECTOR_PUBLIC );
#else //编译了REFLECTOR且编译了路由器或终端
APS_ReflectorInit( APS_REFLECTOR_PRIVATE );
#endif
#endif
#if !defined( ZDO_COORDINATOR ) || defined( SOFT_START )//如果没有定义协调器ZDO_COORDINATOR ),则还定义了SOFT_START则进行连接初始化
NLME_DeviceJoiningInit();
#endif
}
uint8 ZDOInitDevice( uint16 startDelay )
{
//初始化设备网络状态为ZDO_INITDEV_NEW_NETWORK_STATE:新的网络状态.可能意味着ZCD_NV_STARTUP_OPTION不能恢复,或没有任何网络状态恢复
uint8 networkStateNV = ZDO_INITDEV_NEW_NETWORK_STATE;
uint16 extendedDelay = 0;
devState = DEV_INIT; // Remove the Hold state
// Initialize leave control logic
//函数读取NV项目ZCD_NV_LEAVE_CTRL的值,ZDApp_LeaveCtrl指向这个值
ZDApp_LeaveCtrlInit();
// Check leave control reset settings
//设备的断开会造成DEV_HOLD状态,这里面设置的.
ZDApp_LeaveCtrlStartup( &devState, &startDelay );
// Leave may make the hold state come back
//以上两个函数设置了对设备离开时的控制,如果有延时则延时,没有则
//把设备状态设为DEV_HOLD
//ZDO_INITDEV_LEAVE_NOT_STARTED:该设备没有在网络中,下次调用才启用.
if ( devState == DEV_HOLD )
return ( ZDO_INITDEV_LEAVE_NOT_STARTED ); // Don't join - (one time).
#if defined ( NV_RESTORE )
// Get Keypad directly to see if a reset nv is needed.
// Hold down the SW_BYPASS_NV key (defined in OnBoard.h)
// while booting to skip past NV Restore.
if ( HalKeyRead() == SW_BYPASS_NV )
//SW_BYPASS_NV按键处于按下状态时,则避开网络层的NV存储
networkStateNV = ZDO_INITDEV_NEW_NETWORK_STATE; //设备网络状态为新的网络状态
else
{
// Determine if NV should be restored
//函数返回的设备网络状态要么是新的网络状态;要么是恢复的网络状态;以此
//来确定要不要读取NV里相应条目来恢复网络先前状态
networkStateNV = ZDApp_ReadNetworkRestoreState();
}
//如果设备的网络状态为恢复的网络状态
if ( networkStateNV == ZDO_INITDEV_RESTORED_NETWORK_STATE )
{
networkStateNV = ZDApp_RestoreNetworkState();
}
else
{
// Wipe out the network state in NV
//恢复设备先前的网络状态参数
//设置devStartMode = MODE_RESUME
NLME_InitNV();
NLME_SetDefaultNV();
}
#endif
//如果设备的网络状态为新的网络状态,
if ( networkStateNV == ZDO_INITDEV_NEW_NETWORK_STATE )
{
//根据预编译来设置设备新的网络状态参数
ZDAppDetermineDeviceType();
// Only delay if joining network - not restoring network state
extendedDelay = (uint16)((NWK_START_DELAY + startDelay)
+ (osal_rand() & EXTENDED_JOINING_RANDOM_MASK));
}
// Initialize device security
ZDApp_SecInit( networkStateNV );
// Trigger the network start
ZDApp_NetworkInit( extendedDelay );
return ( networkStateNV );
}
ZigBee设备的启动,最终是要调用ZDO_StartDevice()函数来实现的。下面看一下是怎么启动这个函数的。在ZDOInitDevice()函数的最后,调用了下面的ZDApp_NetworkInit()函数,在这个函数中,启动了ZDO_NETWORK_INIT事件,这个事件是在ZDApp_event_loop()事件处理函数中进行处理的。在这个事件中调用了启动设备的函数ZDO_StartDevice(),这函数在前面的文章中也已经分析过了。
void ZDApp_NetworkInit( uint16 delay )
{
if ( delay )
{
// Wait awhile before starting the device
osal_start_timerEx( ZDAppTaskID, ZDO_NETWORK_INIT, delay );
}
else
{
osal_set_event( ZDAppTaskID, ZDO_NETWORK_INIT );
}
}
UINT16 ZDApp_event_loop( byte task_id, UINT16 events )
{
................
if ( events & ZDO_NETWORK_INIT )
{
// Initialize apps and start the network
devState = DEV_INIT;
ZDO_StartDevice( (uint8)ZDO_Config_Node_Descriptor.LogicalType, devStartMode,
DEFAULT_BEACON_ORDER, DEFAULT_SUPERFRAME_ORDER );
// Return unprocessed events
return (events ^ ZDO_NETWORK_INIT);
}
.....................
}
下面以SimpleSwitchEB为例子看看当定义了HOLD_AUTO_START选项后,程序的流程是怎么样的。在void SAPI_Init( byte task_id )函数的最后,有下面一句话,
osal_set_event(task_id, ZB_ENTRY_EVENT);下图是编译选项的设置:
这将触发ZB_ENTRY_EVENT事件,这个事件的处理在,
UINT16 SAPI_ProcessEvent( byte task_id, UINT16 events )
{
.................................
if ( events & ZB_ENTRY_EVENT )
{
uint8 startOptions;
// Give indication to application of device startup
//这个函数不处理ZB_ENTRY_EVENT事件
zb_HandleOsalEvent( ZB_ENTRY_EVENT );
// LED off cancels HOLD_AUTO_START blink set in the stack
//关闭协议栈中LED4的闪烁,LED4灯闪烁表明没有正常启动设备或者没有加入网络 关闭栈中的HOLD指示
HalLedSet (HAL_LED_4, HAL_LED_MODE_OFF);
zb_ReadConfiguration( ZCD_NV_STARTUP_OPTION, sizeof(uint8), &startOptions );
if ( startOptions & ZCD_STARTOPT_AUTO_START )
{
zb_StartRequest();
}
else
{
//首次使用时,闪烁LED2,指示外部输入,等待启动设备
// blink leds and wait for external input to config and restart
HalLedBlink(HAL_LED_2, 0, 50, 500);
}
return (events ^ ZB_ENTRY_EVENT);
}
..............................
}
在按键处理函数中,可以看到
void zb_HandleKeys( uint8 shift, uint8 keys )
{
uint8 startOptions;
uint8 logicalType;
// Shift is used to make each button/switch dual purpose.
if ( shift )
{
if ( keys & HAL_KEY_SW_1 )
{
}
if ( keys & HAL_KEY_SW_2 )
{
}
if ( keys & HAL_KEY_SW_3 )
{
}
if ( keys & HAL_KEY_SW_4 )
{
}
}
else
{
if ( keys & HAL_KEY_SW_1 )
{
if ( myAppState == APP_INIT )
{
// In the init state, keys are used to indicate the logical mode.
// The Switch device is always an end-device
logicalType = ZG_DEVICETYPE_ENDDEVICE;
zb_WriteConfiguration(ZCD_NV_LOGICAL_TYPE, sizeof(uint8), &logicalType);
// Do more configuration if necessary and then restart device with auto-start bit set
zb_ReadConfiguration( ZCD_NV_STARTUP_OPTION, sizeof(uint8), &startOptions );
startOptions = ZCD_STARTOPT_AUTO_START;//下次启动时,自动启动
zb_WriteConfiguration( ZCD_NV_STARTUP_OPTION, sizeof(uint8), &startOptions );
zb_SystemReset();//这里导致设备重启,重启后,产生ZB_ENTRY_EVENT事件,启动网络设备
}
else
{
// Initiate a binding with null destination
zb_BindDevice(TRUE, TOGGLE_LIGHT_CMD_ID, NULL);
}
}
if ( keys & HAL_KEY_SW_2 )
{
if ( myAppState == APP_INIT )
{
// In the init state, keys are used to indicate the logical mode.
// The Switch device is always an end-device
logicalType = ZG_DEVICETYPE_ENDDEVICE;
zb_WriteConfiguration(ZCD_NV_LOGICAL_TYPE, sizeof(uint8), &logicalType);
zb_ReadConfiguration( ZCD_NV_STARTUP_OPTION, sizeof(uint8), &startOptions );
startOptions = ZCD_STARTOPT_AUTO_START;
zb_WriteConfiguration( ZCD_NV_STARTUP_OPTION, sizeof(uint8), &startOptions );
zb_SystemReset();
}
else
{
// Send the command to toggle light
zb_SendDataRequest( 0xFFFE, TOGGLE_LIGHT_CMD_ID, 0,
(uint8 *)NULL, myAppSeqNumber, 0, 0 );
}
}
if ( keys & HAL_KEY_SW_3 )
{
// Remove all existing bindings
zb_BindDevice(FALSE, TOGGLE_LIGHT_CMD_ID, NULL);
}
if ( keys & HAL_KEY_SW_4 )
{
}
}
}
这样SimpleSwitchEB()就作为了非自动启动设备进行了启动了,也就是说必须在定义了HOLD_AUTO_START宏以后,当按键按下后,就会重新启动网络设备。