Instrukcja obsługi Microchip MRF49XA
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2010-2017 Microchip Technology Inc. DS00001204C-page 1
AN1204
INTRODUCTION
The demand is growing for most applications to move to
wireless communication. The benefits are reduced
costs and easy implementation. Wireless communica-
tion does not require cabling and other hardware, and
the associated installation costs. It can also be imple-
mented in locations where installing cable is difficult.
Since the IEEE released the Wireless Personal Area
Network (WPAN) specification (IEEE 802.15.4™) in
2003 and onwards, it has become the real industry
standard for low-rate WPANs (LR-WPAN). The
specification applies to low-data rate applications with
low-power and low-cost requirements.
The Microchip MiWi™ P2P Wireless Protocol is
supported in MiWi Development Environment (DE).
It is
a variation of IEEE 802.15.4, using Microchip’s IEEE
802.15.4 compliant and other proprietary RF
transceivers which are controlled by Microchip 8-, 16-, or
32-bit microcontroller with a Serial Peripheral Interface
(SPI). The Microchip MiWi P2P protocol stacks are now
expanded beyond the IEEE 802.15.4 specification to
support Microchip proprietary transceivers while using
IEEE 802.15.4 Media Access Control (MAC) layer
design as the reference. The MiWi P2P Wireless
Protocol Stack supports both P2P and Star topologies.
The MiWi P2P protocol provides reliable direct wireless
communication through a user friendly programming
interface. It has a rich feature set that can be compiled
in and out of the stack to meet a wide range of customer
needs while minimizing the stack footprint.
This application note describes all about MiWi P2P
Protocol and also its differences from IEEE 802.15.4.
The document details the supported features,
implementations and usage for wireless application
developers.
It is recommended for the readers to go through the
IEEE 802.15.4 specification and Microchip MiMAC/
MiApp interfaces before reading this application note or
working with the MiWi P2P and Star wireless protocols.
For more information on MiMAC and MiApp, refer to the
Application Notes “AN1283 Microchip Wireless MiWi™
Media Access Controller – MiMAC” (DS00001283) and
“AN1284 Microchip Wireless MiWi™ Application
Programming Interface – MiApp” (DS00001284).
Protocol Overview
The MiWi P2P protocol stack modifies the
IEEE 802.15.4 specification MAC layer by adding com-
mands that simplify the handshaking process. It simpli-
fies link disconnection and channel hopping by
providing supplementary MAC commands. However,
application-specific decisions, such as when to perform
an energy scan or when to jump channels, are not
defined in the protocol. These issues are left to the
application developer.
Protocol Features
The MiWi P2P Wireless Protocol has the following
features:
• Supports Microchip PIC16, PIC18, PIC24,
dsPIC33 and PIC32 platforms through Microchip
XC8, XC16 and XC32 compilers, respectively
• Supports MRF24J40 (IEEE 802.15.4 compliant
radio transceiver) and MRF89XA (proprietary
radio transceiver) through Microchip Application
Libraries
• Functions as a state machine
(not RTOS-dependent)
• Supports a sleeping device at the end as a
communication node
• Enables Energy Detect (ED) scanning to operate
on the least-noisy channel
• Provides active scan for detecting new and
existing connections
• Supports frequency agility (channel hopping)
Protocol Considerations
The MiWi P2P protocol is a variation of IEEE 802.15.4
and supports both peer-to-peer (P2P) and star
topologies. It has no routing mechanism, hence the
wireless communication coverage is defined by the
radio range. The Guaranteed Time Slot (GTS) and
Beacon networks by option are not supported, hence
both the sides of the communication cannot
simultaneously go to Sleep mode. If the application
requires wireless networking and routing instead of P2P
and Star type communication, MiWi Mesh is a suitable
communication platform for proprietary standards. For
details on MiWi Mesh, refer to the Application Note
“Microchip MiWi™ Mesh Wireless Networking Protocol”
from the Microchip website. However, for
interoperability type of requirements with wireless
devices or nodes of other vendors, ZigBee
®
protocol
based on IEEE802.15.4 is a good option.
Authors: Yifeng Yang
Pradeep Shamanna
Derrick Lattibeaudiere
Vivek Anchalia
Microchip Technology Inc.
Microchip MiWi™ P2P Wireless Protocol
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | Nie skategoryzowane |
| Model: | MRF49XA |
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