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AN241

2.4 GHZ ZIGBEE™ NETWORK APPLICATION INTERFACE PROGRAMMER'S GUIDE

Silicon Laboratories 

AN241

5.1. NLME-NETWORK-DISCOVERY

5.1.1. Description

This primitive instructs the device's network layer to search for networks within connection range. The search

operation will populate a list of available networks along with the characteristics of each.

Applicability:

All device types.

Prerequisite:

NLME-RESET

5.1.2. Request

Description:

This function is called to request that the NWK layer discover networks currently operating

within range.

Function Prototype:

Parameters:

void nlmeNetworkDiscoveryRequest(UINT32 scanChannels,

UINT8 scanDuration)

UINT32 scanChannels

32 bit long value. The five most significant bits (b27, ... ,b31) are reserved. The 27 least

significant bits (b0, b1, ... b26) indicate which channels are to be scanned (1 = scan, 0 =

do not scan) for each of the 27 valid channels.

UINT8 scanDuration

8 bit long unsigned character. Valid between 0 and 0x0E. A value used to calculate the

length of time to spend scanning each channel. The time spent scanning each channel is

(aBaseSuperframeDuration * (2n + 1)) symbols, where n is the value of the ScanDuration

parameter. Constant aBaseSuperframeDuration is defined in the IEEE 802.15.4 Standard.

5.1.3. Confirm

Description:

Results:

Confirmation written to nlmeConfirm global.

nlmeConfirm.confirmId = N_DISC_CFM;

nlmeConfirm.buffer structure:

typedef struct{

BYTE NetworkCount;

NETWORK_DESCRIPTOR nwkDescriptor[

MAX_USE_CHANNEL_COUNT];

MAC_ENUM Status;

}NLME_NETWORK_DISCOVERY_CONFIRM; (defined in HS_NET.h)

typedef struct {

WORD panID;

BYTE logicalChannel;

BYTE stackProfile;

BYTE zigBeeVersion;

BYTE beaconOrder;

BYTE superFrameOrder;

BOOL permitJoining;

BYTE securityLevel;

}NETWORK_DESCRIPTOR; (defined in HS_NET.h)

BYTE NetworkCount

Number of networks discovered during the search.

12

Rev. 0.1

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