a (short) introduction to zigbee · a (short) introduction to zigbee christian tr¨odhandl embedded...

IntroductionProtocol Overview

Atmel ZigBee NodesExample Application

A (Short) Introduction to ZigBee

Christian Trodhandl

Embedded Computing Systems GroupVienna University of Technology

Europe

April 19, 2007

Trodhandl Introduction to ZigBee 1

Outline

1 Introduction

2 Protocol OverviewNode TypesNetwork TopologyProtocol Stack ArchitectureCommunication between Nodes

3 Atmel ZigBee NodesHardwareLibrary

4 Example Application

Outline

1 Introduction

The ZigBee standard for wireless sensor networks

Application domain: Personal Area Network (PAN).

Short range operation, low cost sensors, low powerconsumption.

Topology: Star or Peer-to-Peer.

Access control: Beacon or CSMA/CA.

Reliable data transfer.

Data rates: 250 kb/s (2450 MHz band), 40 kb/s (915 MHz),20 kb/s (868 MHz).

Node TypesNetwork TopologyProtocol Stack ArchitectureCommunication between Nodes

Outline

1 Introduction

Different Node Types in a ZigBee Network

Full Function Device (FFD): Can communicate with everytype of device. A FFD can operate in three different modes:

PAN Coordinator: Sends beacon frames, provides routinginformation, manages short, network-specific addressesCoordinator: Acts as router.Normal device.

Reduced Function Device (RFD): Can only talk to a singleFFD.

PAN Coordinator: Sends beacon frames, provides routinginformation, manages short, network-specific addresses

Coordinator: Acts as router.Normal device.

PAN Coordinator: Sends beacon frames, provides routinginformation, manages short, network-specific addressesCoordinator: Acts as router.

Normal device.

Star Network

In the star topology, the PAN coordinator chooses a unique (withinits radio sphere of influence) PAN id. All attached nodes can onlytalk to the central PAN coordinator.

Peer-to-Peer Network

Within a peer-to-peer topology, each FFD can communicate withany other device within its range. A RFD may only communicatewith a single FFD at a given time.

Multi-Cluster Network

Larger networks may be established by forming multi-clustertopologies. Each cluster has a single cluster head that isresponsible for coordination within the cluster.

The IEEE 802.15.4-2003/ZigBee Protocol Stack

The IEEE 802.15.4-2003 standard describes the physical andMAC layer.

ZigBee builds on the IEEE standard and defines the networkand application layer.

Physical (PHY) Layer

The physical layer is responsible for:

Activation/Deactivation of transceiver.

Channel selection, assessment.

Transmission and reception of packets.

Frequency bands: 2.4 GHz (worldwide), 868 MHz (EU), 916MHz (US)

Medium Access Control (MAC) Layer

The following services are provided by the MAC layer:

Beacon management

Channel access

Guaranteed Time Slot (GTS) management

Frame validation

Acknowledgment

Association, disassociation

Network (NWK) Layer

The lower level of the ZigBee protocol builds on the MAC layer ofIEEE 802.15.4.

Topology specific routing

Security

New device configuration

Network startup

Network (NWK) Layer (cont.)

Joining/leaving a network

Addressing

Neighbour discovery

Route discovery

Reception control

Application Layer

The application layer provides the following services:

Maintain tables for binding

Fragmentation, reassembly and reliable data transport

Provide communication endpoints for the application

Discovering devices and application services.

Initiating/responding to binding requests between endpoints

Addressing

Each ZigBee node has a unique 64 bit MAC address

Additionally the Coordinator maintains a table to map the 64bit addresses to network-specific 16 bit addresses

Within each node, the application can define up to 240Application endpoints.

Media Access (CSMA/CA)

The IEEE 802.15.4 standard describes the CSMA/CA mechanismto access the wireless channel:

A device that wishes to transmit data frames waits for arandom backoff.

If the channel is clear after the backoff, the data istransmitted.

If the channel is busy, the device waits for another randomperiod.

(Optional) Acknowledgment frames are sent immediately afterthe corresponding data frames without using the CSMA/CAmechanism.

Beacon Mode

The network may also utilize the so-called beacon mode:

A round (superframe) is divided into 16 equally sized slots.

Coordinator regularly sends beacon frames in the first slot.

The beacon frames are used to synchronize the attacheddevices, identifies the PAN, and describes the superframestructure.

Any device that wishes to send data uses the CSMA/CAmechanism, but aligns the sent frames to the slots.

The PAN coordinator may assign guaranteed time slots (GTS)to devices for low-latency or fixed data bandwidth.

Up to 7 GTS can be allocated in this way at the end of thesuperframe.

Frame Types

The IEEE standard defines four different frame types:

A beacon frame: Sent by the coordinator to announce thenetwork and contains the superframe structure.

A data frame: Used for data transfer

An acknowledgment frame: To confirm the successfulreception of a frame.

A MAC command frame: For handling MAC peer entitycontrol transfers.

Service Primitives

Defines the communication between different layers of theprotocol:

Request: Passed from user to the underlying layer to initiate aservice.

Indication: To indicate an internal event that is significant tothe user.

Response: To complete a procedure invoked by an Indicationprimitive.

Confirm: Passed to the user application to convey the resultsof a previous service request.

Service Primitives (cont.)

HardwareLibrary

Outline

1 Introduction

HardwareLibrary

ATAVRRZ200 Demonstration Kit

The Atmel ATAVRRZ200 demonstration kit contains the followingcomponents:

Five ZigBee nodes, each equipped with an ATmega1281 8 bitAVR microcontroller and an AT86FR230 ratio controller.

Three buttons and three LEDs on each board.

Additional LCD board.

Power supply over battery.

USB programming adapter.

HardwareLibrary

ATAVRRZ200 Demonstration Kit (cont.)

HardwareLibrary

Interface between Microcontroller and transceiver

Microcontroller communicates with transceiver over SPIinterface.

Additionally, an interrupt and a timer clock is supplied to themicrocontroller.

HardwareLibrary

Atmel MAC Library for AT86RF230 transmitters

Atmel supplies a programming library for its transceiver modules:

The library is called libl2 rdk230 rel.a and is available for theavr-gcc and iar C compiler.

Only IEEE 802.15.4-2003 support.

ZigBee layer has to be implemented within the application (noendpoint-to-endpoint support).

Library uses timer 1 with ICP.

Library calls (for request and response) are prefixed withwpan .

The application may define certain callback functions that areinvoked by the library (for confirm and indication events).This callback functions are prefixed with usr .

Outline

1 Introduction

Example device application

The following application code shows how to use the Atmel MAClibrary for implementing a device application.The application starts the MAC stack and associates with thecoordinator node. (Code snippets taken from the demos suppliedwith the Atmel MAC library, see disclaimer)

Including Header Files

/∗ I n c l u d e i n t e r r u p t . h f o r the s e i ( ) macro ∗/#inc lude < av r / i n t e r r u p t . h>

/∗ d e f i n e s f o r demo a p p l i c a t i o n s ∗/#inc lude ” wpan de f i n e s . h”

/∗ i e e e c o n s t . h ho l d s IEEE 8 0 2 . 1 5 . 4 c on s t a n t sand a t t r i b u t e d e f i n i t i o n s ∗/

#inc lude ” i e e e c o n s t . h”

/∗ wpan mac . h i n c l u d e s f u n c t i o n d e f i n i t i o n s f o ra l l l i b r a r y f u n c t i o n s ∗/

#inc lude ”wpan mac . h”

Define a variable to hold our status

/∗ d e f i n e s t a t u s v a r i a b l e ∗/typedef s t ruc t{

u i n t 1 6 t d e v i c e s h o r t a d d r e s s ;u i n t 8 t coo rd add re s s mode ;u i n t 6 4 t c o o r d add r e s s ;u i n t 1 6 t pan i d ;u i n t 8 t l o g i c a l c h a n n e l ;u i n t 8 t msdu handle ;d e v i c e s t a t e t s t a t e ;

} d e v i c e s t a t u s t ;

s t a t i c d e v i c e s t a t u s t d s t a t u s ;

Function to initialize the application

/∗ d e f i n e s t a t u s v a r i a b l e ∗/s t a t i c void a p p l i c a t i o n i n i t ( void ){

/∗ r e s e t g l o b a l a p p l i c a t i o n s t a t u s v a r i a b l e ∗/memset(&d s t a t u s , 0 , s i z eo f ( d s t a t u s ) ) ;/∗ i n i t IO po r t s . . . . ∗//∗ i n i t mac l a y e r ∗/wpan i n i t ( ) ;

SET STATE( INIT DONE ) ;/∗ enab l e i n t e r r u p t s ∗/s e i ( ) ;return ;

Define main user task

s t a t i c void sw i t c h t a s k ( void ){

/∗ do someth ing . . . ∗/

i f ( s end da ta ){

/∗ send data ∗/wpan mcpsdata addr t a i ;a i . SrcAddrMode = WPAN ADDRMODE SHORT;a i . SrcPANId = d s t a t u s . p an i d ;a i . SrcAddr = d s t a t u s . d e v i c e s h o r t a d d r e s s ;a i . DstAddrMode =

d s t a t u s . coo rd add re s s mode ;

Define main user task (cont.)

a i . DstPANId = d s t a t u s . p an i d ;a i . DstAddr = d s t a t u s . c o o r d add r e s s ;wpan mcps da ta r eque s t (&a i ,

d s t a t u s . msdu handle++,WPAN TXOPT ACK,( void ∗) & d s t a t u s . l ed ,s i z eo f ( u i n t 8 t ) ) ;

}return ;

Define a callback function for received data

void u s r mcp s d a t a i n d (wpan mcpsdata addr t ∗ pAddr In fo ,u i n t 8 t mpduLinkQual i ty ,u i n t 8 t Secu r i t yUse ,u i n t 8 t ACLEntry , u i n t 8 t msduLength ,u i n t 8 t ∗msdu )

{i f ( ( d s t a t u s . s t a t e == RUN) &&

( pAddr In fo−>DstPANId == d s t a t u s . p an i d ) ){

/∗ do someth ing wi th r e c e i v e d data ∗/}

Main function

i n t main ( void ){

a p p l i c a t i o n i n i t ( ) ;/∗ send r e s e t , scan r eque s t , . . . ∗/mac do r e s e t ( ) ;whi le (1 ){

whi le ( wpan task ( ) ){

/∗ s h o r t runn ing t a s k s ∗/}sw i t c h t a s k ( ) ; /∗ main u s e r t a s k ∗/

Some References

IEEE.IEEE std 802.15.4-2003: Wireless medium access control (MAC) and physicallayer (PHY) specifications for low-rate wireless personal area networks(LR-WPANs).Specification, IEEE, October 2003.Available at http://www.ieee802.org.

ZigBee Alliance.ZigBee specification.Specification, ZigBee Alliance, December 2006.Available at http://www.zigbee.org.

Atmel.IEEE 802.15.4 MAC User Guide.2325 Orchard Parkway, San Jose, California, September 2006.Available at http://www.atmel.com.

Atmel.ATAVRRZ200 Demonstartion Kit AT86RF230 (2450 MHz band) RadioTransceiver User Guide.2325 Orchard Parkway, San Jose, California, July 2006.Available at http://www.atmel.com.

Thank you for your attention!Questions?

Sourcecode Disclaimer

Copyright (C) 2006, Atmel Corporation. All rights reserved.Redistribution and use in source and binary forms, with or without modification, are permitted provided that thefollowing conditions are met:1. Redistributions of source code must retain the above copyright notice, this list of conditions and the followingdisclaimer.2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and thefollowing disclaimer in the documentation and/or other materials provided with the distribution.3. The name of ATMEL may not be used to endorse or promote products derived from this software withoutspecific prior written permission.

THIS SOFTWARE IS PROVIDED BY ATMEL ”AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES,

INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL

ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

a (short) introduction to zigbee · a (short) introduction to zigbee christian tr¨odhandl embedded...

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