Rosewill RPLC-201P Manual do Utilizador descarregar pdf

CIRCUIT CELLAR • MARCH 2014 #284

TESTS & CHALLENGES

Sponsored by WIZnet — circuitcellar.com/wiznet2014

he microelectronics revolution is entering

a new phase of mass market acceptance

and application. I’m talking about the

proliferation of popular low-cost single-board

computers (SBCs) that let anyone craft their

own embedded application. Like magic, these

platforms turn mere “users” into “makers.”

These magic microcontrollers all share

certain characteristics.

The hardware itself is

low cost with a range

of products and add-

ons; the tools (i.e.,

compiler and IDE) are

free and easy to use;

and, most importantly,

there’s a self-sustaining

“community” leveraging

shared knowledge for the

beneﬁt of all.

I’ve had the pleasure

of working with popular

platforms such as Arduino,

Texas Instruments’s

LaunchPad, ARM mbed,

Parallax, and others (see

Photo 1). All of them

make it quick and easy,

and dare I say fun, to

whip out surprisingly

sophisticated applications. And all have vibrant

user groups with plenty of useful resources

(tools, examples, advice) to share.

Now it’s time to connect all these gadgets

to the Internet of Things (IoT). Enter WIZnet

and its latest and greatest “smart” Ethernet

chip. The W5500 (see Figure 1) starts with

a standard 10/100 Ethernet interface (i.e.,

MAC and PHY) but then goes further with

large RAM buffers (16-KB transmit and 16-

KB receive) and hardware TCP/IP protocol

processing.

I discovered WIZnet’s first chip, the

W3100, way back in 2001 (see my article

“I-Way the Hard Way,” Circuit Cellar 135,

2001). Of course by now, as with all things

silicon, the new W5500 is better, faster, and

lower cost. But the concept is still exactly

the same: “Internet enable” applications by

handling the network chores in hardware so

the application microcontroller doesn’t have

to do it in software.

The large RAM buffers help decouple the

microcontroller from network activity. In a

recent project (see my article, “Weatherize

Your Embedded App,” Circuit Cellar 273,

2013), I used the RAM to receive an entire

10-KB+ webpage, completely eliminating the

need for the microcontroller to juggle data at

network speed. And any of the 32-KB on-chip

RAM that isn’t needed for network buffering

is free for general-purpose use, a big plus for

typically RAM-constrained microcontrollers.

The other major WIZnet hardware assist

is TCP/IP processing using IP addresses,

sockets, and familiar commands including

OPEN, CONNECT, SEND, RECEIVE, DISCONNECT.

The high-level interface to the network frees

up microcontroller cycles and code space that

would otherwise be needed for a software

TCP/IP stack.

DISAPPEARING ACT

The WIZ550io (see Photo 2) is an integrated

module that includes everything you need to

get online.

Connecting the WIZ550io to your favorite

microcontroller is easy. There’s just a SPI

Connect the Magic

An Introduction to the WIZnet W5500

Are you ready to join the Internet of Things (IoT) revolution? You can start

by building an innovative ’Net-enabled design to enter in the WIZnet Connect

the Magic Challenge. Before you begin, read through this comprehensive

introduction to WIZnet’s W5500 “smart” Ethernet chip and the WIZ550io

integrated module.

By Tom Cantrell (US)

WIZnet Connect the Magic

Challenge: March 3, 2014 –

August 3, 2014

Visit circuitcellar.com/wiznet2014

• Request Free WIZ550io Modules

• How to Register & Enter

• Rules & Regulations

• Prize Info

• And more

Subscription: http://circuitcellar.com/subscription/

1 2 3 4 5 6

Resumo do Conteúdo

Página 1 - Connect the Magic

CIRCUIT CELLAR • MARCH 2014 #28468TESTS & CHALLENGESSponsored by WIZnet — circuitcellar.com/wiznet2014The microelectronics revolution is entering

Página 2 - HIDDEN WIRES

circuitcellar.com69TESTS & CHALLENGESSponsored by WIZnet — circuitcellar.com/wiznet2014(MISO, MOSI, SCLK, nSCS), three status/control lines (nRESE

Página 3 - TESTS & CHALLENGES

CIRCUIT CELLAR • MARCH 2014 #28470TESTS & CHALLENGESSponsored by WIZnet — circuitcellar.com/wiznet2014there are powerline communication “starter k

Página 4 - SERVER UP MY SLEEVE

circuitcellar.com71TESTS & CHALLENGESSponsored by WIZnet — circuitcellar.com/wiznet2014100 m) and/or high-current loads. Use a “PoE Calculator,” s

Página 5 - PRESTO, CHANGE-O

CIRCUIT CELLAR • MARCH 2014 #28472TESTS & CHALLENGESSponsored by WIZnet — circuitcellar.com/wiznet2014into the microcontroller itself, so you’ll h

Página 6 - LEARN SOME TRICKS

circuitcellar.com73TESTS & CHALLENGESSponsored by WIZnet — circuitcellar.com/wiznet2014The Arduino code (see Photo 9) just sits in a loop checking

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Rosewill RPLC-201P Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Analisadores de rede Rosewill RPLC-201P. An Introduction to the WIZnet W5500 Manual do Utilizador

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