Microchip MRF24J40MA Handleiding

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 2009-2017 Microchip Technology Inc. DS00001284B-page 1

AN1284

INTRODUCTION

Developing wireless applications can be challenging.

Apart from Radio Frequency (RF) circuit designs, the

firmware development process may require the devel-

opers to understand the details of RF transceivers, as

well as the different wireless communication protocols.

Microchip has developed a way to handle the complex

RF hardware or communication protocol stack software

development, or both, which enables wireless applica-

tion developers to focus on their own application devel-

opment. This type of wireless communication is

achieved through a concise, yet powerful communica-

tion programming interface in the application layer

called MiApp which is defined in this application note.

The MiApp specification defines the programming

interfaces between the application layer and Microchip

proprietary wireless communication protocols. The

MiApp programming interface is implemented in two

ways: as configuration parameters defined in the con-

figuration file, and as a set of function calls to the Micro-

chip proprietary wireless communication protocols.

Complying with the MiApp specification defined in this

application note, applications can use any Microchip

proprietary wireless protocols. With little or no modifica-

tion in the application layer, software development can

be easily changed between a proprietary P2P/Star

topology connection protocol to a full Mesh proprietary

networking protocol for small or big networks, depend-

ing on the application needs.

FIGURE 1: BLOCK DIAGRAM OF MICROCHIP WIRELESS MiWi™ STACK

Authors: Yifeng Yang

Pradeep Shamanna

Derrick Lattibeaudiere

Vivek Anchalia

Microchip Technology Inc.

User Application

MiApp

Interchangeable Wireless Communication Protocols

MiWi™ P2P/Star

MiWi™ Mesh

Future Microchip Proprietary

Wireless Protocols ...

MiMAC

Interchangeable RF Transceivers

MRF24J40 Transceiver

MRF89XA Transceiver

Future Microchip RF

Transceivers ...

Application

Configuration

Protocol Configuration

RF Transceiver

Configuration

Microchip Wireless MiWi™ Application

Programming Interface – MiApp

AN1284

DS00001284B-page 2  2009-2017 Microchip Technology Inc.

The MiApp specification benefits wireless application

developers in multiple ways:

• Wireless application development focuses on its

application. Complex RF or protocol consider-

ations are transparently handled by the MiApp

programming interface.

• The MiApp specification allows maximum flexibil-

ity to choose a wireless protocol at any stage of

application software development with little effort,

thus greatly lowering the risk of software develop-

ment. Application requirement changes in net-

working capabilities have little or no impact in

application development.

• MiApp uses the same control interface for

Microchip wireless proprietary protocols. Once

you are familiar with MiApp, you can apply that

knowledge to the development of another applica-

tion even if it has a completely different network-

ing capability requirement.

• By communicating to the Microchip proprietary

protocols, MiApp indirectly talks to the Microchip

RF transceivers through the MiMAC interface. As

a result, MiApp indirectly enables the wireless

application developers to switch between

Microchip RF transceivers through MiMAC. This

flexibility, in turn, further reduces the development

risk of the wireless application project.

FEATURES

The MiApp programming interface has the following

features:

• Easy to learn and use

• Powerful interface to meet most requirements

from wireless applications

• Little or no extra effort to migrate the wireless

application between Microchip proprietary

wireless protocols

• Minimum footprint impact

CONSIDERATIONS

The MiApp specification is designed to support Micro-

chip proprietary wireless communication protocols.

Once a wireless application is implemented by the

MiApp programming interface, the Microchip RF trans-

ceivers are also supported through standardization in

MiMAC, the module defined in the Media Access Con-

troller (MAC) layer.

MiMAC standardizes the interface between Microchip

wireless protocols and Microchip RF transceivers.

MiMAC makes Microchip RF transceivers interchange-

able with little or no change in the software application

code. For more information on MiMAC, refer to the

Application Note “AN1283 Microchip Wireless MiWi™

Media Access Controller - MiMAC” (DS00001283).

MiMAC regulates the lower interface of the Microchip

proprietary wireless protocols, while MiApp regulates

the higher interface of the Microchip proprietary wire-

less protocols. Working together, both MiMAC and

MiApp provide wireless application developers the

maximum flexibility to choose the RF transceivers and

wireless communication protocols at any stage of soft-

ware development, thus further minimizing the risk of

software development.The block diagram in Figure 1

shows the Microchip Wireless MiWi™ stack offerings.

There are three layers of configurations for application,

protocol stacks and RF transceivers. Application con-

figuration may change between devices in the same

application according to their hardware design, role in

the application and network. Wireless application

developers tend to do the majority of the configuration

in the application layer. Protocol configurations fine-

tune the behavior of the protocol stack. The majority of

protocol stack configurations define the timing and

routing mechanism for the chosen wireless protocol.

Transceiver configurations define the frequency band,

data rate and other RF related features of the RF trans-

ceiver. The default settings for the protocol and RF

transceiver configurations may work with the applica-

tion without any modification. The application configu-

rations, however, usually need to be changed to fit the

needs of different wireless applications.

 2009-2017 Microchip Technology Inc. DS00001284B-page 3

AN1284

MiApp OVERVIEW

As discussed earlier, there are two parts defined in the

MiApp specification:

• Configuration parameters defined in the

configuration file

• Signatures of function calls to the Microchip

proprietary wireless protocols

The configuration file contains parameters that must be

set before compilation. Generally, there are two types

of parameters defined in the configuration file:

•Hardware Definitions – these includes MCU

hardware resources, peripherals definition and

the definition for the RF transceiver control pins.

The default hardware definitions are defined in

several Microchip standard demo boards that

support Microchip RF transceivers. In these

cases, the definition of demo boards automatically

introduces all hardware definitions.

•Software Definitions – these definitions control

the code sections to be compiled into the firmware

hex file. The software definitions include selec-

tions of Microchip proprietary wireless protocol,

choice of Microchip RF transceiver, and individual

functionalities. Proper definitions in this category

ensure the minimum firmware footprint with the

intended protocol capabilities.

Application Programming Interfaces (APIs) are the

function calls between the Microchip proprietary

wireless communication protocols with the wireless

application. As a rule, the application interface must be

clean, concise, easy to understand, and powerful.

There are five categories of interfaces for the APIs:

• The initialization interface allows wireless applica-

tion developers to properly initialize the selected

Microchip proprietary wireless protocol in the con-

figuration file.

• The handshaking interface allows the wireless

nodes to discover and get connected with their

peers, or to join the network.

• Interfaces to send messages which enable appli-

cation developers to transmit information from the

current node to an intended audience over-the-air.

• Interfaces to receive messages which enable

application developers to receive information

over- the-air from other devices.

• Special functionalities which ensure the optimal

operating condition for wireless nodes through

environment noise control and power saving.

MiApp CONFIGURATION FILE

The hardware definitions depends on the choices of the

Demo/Development boards, the MCUs and the RF

transceivers. The hardware definitions can be divided

into the following subcategories:

• I/Os on the demo board – these includes the push

buttons, LEDs, serial ports, and so on.

• MCU system resources – these includes the

timers, interrupts, and so on.

• Interconnections between MCU and RF

transceiver

Hardware definitions are mainly associated with hard-

ware selections of the wireless application system

design. They depend more on the hardware than the

software and vary across different designs. As a result,

MiApp does not have a set of standards for those

hardware definitions.

Selective compilation configurations select the features

among the list of available ones. Using the selective

compilation, application developers are able to config-

ure Microchip proprietary wireless protocols to perform

the desired functionality with the least possible system

resources. Table 1 describes the possible selective

compilation configurations and its scope, value, and

functionality.

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	MRF24J40MA

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