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(itstool) path: authorgroup/author
<personname><firstname>Frank</firstname><surname>Durda</surname></personname><affiliation> <_:address-1/> </affiliation>
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Context English Portuguese (Brazil) State
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Edson Brandi, ebrandi@FreeBSD.org, 2018
Danilo G. Baio, dbaio@FreeBSD.org, 2018
Serial and UART Tutorial
Tutorial sobre Comunicações Seriais e UART
<email>uhclem@FreeBSD.org</email>
<email>uhclem@FreeBSD.org</email>
<personname><firstname>Frank</firstname><surname>Durda</surname></personname><affiliation> <_:address-1/> </affiliation>
<personname><firstname>Frank</firstname><surname>Durda</surname></personname><affiliation> <_:address-1/> </affiliation>
FreeBSD is a registered trademark of the FreeBSD Foundation.
FreeBSD is a registered trademark of the FreeBSD Foundation.
Microsoft, IntelliMouse, MS-DOS, Outlook, Windows, Windows Media and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
Microsoft, IntelliMouse, MS-DOS, Outlook, Windows, Windows Media and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this document, and the FreeBSD Project was aware of the trademark claim, the designations have been followed by the <quote>™</quote> or the <quote>®</quote> symbol.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this document, and the FreeBSD Project was aware of the trademark claim, the designations have been followed by the <quote>™</quote> or the <quote>®</quote> symbol.
$FreeBSD: head/en_US.ISO8859-1/articles/serial-uart/article.xml 44692 2014-04-29 02:46:48Z wblock $
$FreeBSD: head/pt_BR.ISO8859-1/articles/serial-uart/pt_BR.po 52273 2018-09-18 03:29:14Z ebrandi $
This article talks about using serial hardware with FreeBSD.
Este artigo fala sobre o uso de hardware serial com o FreeBSD.
The UART: What it is and how it works
A UART: O que é e como funciona
<emphasis>Copyright © 1996 Frank Durda IV <email>uhclem@FreeBSD.org</email>, All Rights Reserved. 13 January 1996.</emphasis>
<emphasis> Copyright © 1996 Frank Durda IV <email> uhclem@FreeBSD.org </email>, Todos os direitos reservados. 13 de Janeiro de 1996. </emphasis>
The Universal Asynchronous Receiver/Transmitter (UART) controller is the key component of the serial communications subsystem of a computer. The UART takes bytes of data and transmits the individual bits in a sequential fashion. At the destination, a second UART re-assembles the bits into complete bytes.
O controlador UART (Universal Asynchronous Receiver / Transmitter) é o componente chave do subsistema de comunicação serial de um computador. O UART pega bytes de dados e transmite os bits individuais de forma seqüencial. No destino, um segundo UART reúne os bits em bytes completos.
Serial transmission is commonly used with modems and for non-networked communication between computers, terminals and other devices.
A transmissão serial é comumente usada com modems e para comunicação entre computadores, terminais e outros dispositivos sem rede.
There are two primary forms of serial transmission: Synchronous and Asynchronous. Depending on the modes that are supported by the hardware, the name of the communication sub-system will usually include a <literal>A</literal> if it supports Asynchronous communications, and a <literal>S</literal> if it supports Synchronous communications. Both forms are described below.
Existem duas formas primárias de transmissão serial: Síncrona e Assíncrona. Dependendo dos modos suportados pelo hardware, o nome do subsistema de comunicação geralmente incluirá um <literal>A</literal> se ele suportar comunicações assíncronas, e um <literal>S</literal> se ele suportar Comunicações síncronas. Ambas as formas são descritas abaixo.
Some common acronyms are:
Algumas siglas comuns são:
UART Universal Asynchronous Receiver/Transmitter
UART Universal Asynchronous Receiver/Transmitter
USART Universal Synchronous-Asynchronous Receiver/Transmitter
USART Universal Synchronous-Asynchronous Receiver/Transmitter
Synchronous Serial Transmission
Transmissão Serial Síncrona
Synchronous serial transmission requires that the sender and receiver share a clock with one another, or that the sender provide a strobe or other timing signal so that the receiver knows when to <quote>read</quote> the next bit of the data. In most forms of serial Synchronous communication, if there is no data available at a given instant to transmit, a fill character must be sent instead so that data is always being transmitted. Synchronous communication is usually more efficient because only data bits are transmitted between sender and receiver, and synchronous communication can be more costly if extra wiring and circuits are required to share a clock signal between the sender and receiver.
A transmissão serial síncrona requer que o emissor e o receptor compartilhem um clock entre si, ou que o remetente forneça um sinal estroboscópico ou outro sinal de tempo para que o receptor saiba quando deve <quote>ler</quote> o próximo bit dos dados. Na maioria das formas de comunicação serial síncrona, se não houver dados disponíveis em um dado instante para transmitir, um caractere de preenchimento deve ser enviado para que os dados sejam sempre transmitidos. A comunicação síncrona é geralmente mais eficiente, pois somente os bits de dados são transmitidos entre o emissor e o receptor, e a comunicação síncrona pode ser mais cara se fios e circuitos extras forem necessários para compartilhar um sinal de relógio entre o emissor e o receptor.

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