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Acesso remoto via infra-estrutura de teste IEEE1149.1 a dispositivos lógicos programáveis
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Authors
Abstract(s)
Actualmente verifica-se que a complexidade dos sistemas informáticos tem vindo a
aumentar, fazendo parte das nossas ferramentas diárias de trabalho a utilização de
sistemas informáticos e a utilização de serviços online. Neste âmbito, a internet obtém
um papel de destaque junto das universidades, ao permitir que alunos e professores
possam interagir mais facilmente. A internet e a educação baseada na Web vêm
oferecer acesso remoto a qualquer informação independentemente da localização ou
da hora. Como consequência, qualquer pessoa com uma ligação à internet, ao poder
adquirir informações sobre um determinado tema junto dos maiores peritos, obtém
vantagens significativas.
Os laboratórios remotos são uma solução muito valorizada no que toca a interligar
tecnologia e recursos humanos em ambientes que podem estar afastados no tempo
ou no espaço. A criação deste tipo de laboratórios e a sua utilidade real só é possível
porque as tecnologias de comunicação emergentes têm contribuído de uma forma
muito relevante para melhorar a sua disponibilização à distância. A necessidade de
criação de laboratórios remotos torna-se imprescindível para pesquisas relacionadas
com engenharia que envolvam a utilização de recursos escassos ou de grandes
dimensões.
Apoiado neste conceito, desenvolveu-se um laboratório remoto para os alunos de
engenharia que precisam de testar circuitos digitais numa carta de desenvolvimento de
hardware configurável, permitindo a utilização deste recurso de uma forma mais
eficiente.
O trabalho consistiu na criação de um laboratório remoto de baixo custo, com base em
linguagens de programação open source, sendo utilizado como unidade de
processamento um router da ASUS com o firmware OpenWrt. Este firmware é uma
distribuição Linux para sistemas embutidos.
Este laboratório remoto permite o teste dos circuitos digitais numa carta de
desenvolvimento de hardware configurável em tempo real, utilizando a interface JTAG.
O laboratório desenvolvido tem a particularidade de ter como unidade de
processamento um router. A utilização do router como servidor é uma solução muito
pouco usual na implementação de laboratórios remotos. Este router, quando
comparado com um computador normal, apresenta uma capacidade de processamento e memória muito inferior, embora os testes efectuados provassem que
apresenta um desempenho muito adequado às expectativas.
Currently, the complexity of computer systems is growing fast. They are, in conjunction with the online services they enable to offer, an indispensable part of our lives. In this context, internet plays a fundamental role at universities, allowing an easier interaction between students and teachers. Web-based education offers remote ways of accessing information without spatial or temporal constraints. As a consequence, any one with an internet connection may exchange information about a certain subject directly with an expert. In that context, remote laboratories are an excellent solution to connect technology and human resources in environments that may be far away. Their viability is mainly due to the fast development of emergent communication technologies, and to its impact in diminishing distances. Remote laboratories are an essential part of Web-based engineering lecturing, enabling future engineers to work with lab tools that otherwise would not be accessible to them. Furthermore, they allow sharing expensive resources among multiple community researchers. During this work, a remote laboratory for the test of printed circuit boards and the programming/configuration of programmable logic devices and memories through a JTAG interface was developed. This laboratory allows students to gain access to a real development board through internet, from anywhere and at anytime. This allows an efficient, more flexible, use of the available resources, while increases the availability of laboratory resources beyond lab classes. The developed remote laboratory is based on open source software and on a cheap router with OpenWrt firmware, which acts as a processing unity, one of the innovations of this work. This firmware is a Linux distribution targeted at embedded systems. The router acts as a server, which is not a common solution in the remote laboratory implementation. When compared to a normal computer, the router has a lower processing and memory capacity. However, the tests proved that it has a very good performance, and is able to cope with the demands of the remote laboratory.
Currently, the complexity of computer systems is growing fast. They are, in conjunction with the online services they enable to offer, an indispensable part of our lives. In this context, internet plays a fundamental role at universities, allowing an easier interaction between students and teachers. Web-based education offers remote ways of accessing information without spatial or temporal constraints. As a consequence, any one with an internet connection may exchange information about a certain subject directly with an expert. In that context, remote laboratories are an excellent solution to connect technology and human resources in environments that may be far away. Their viability is mainly due to the fast development of emergent communication technologies, and to its impact in diminishing distances. Remote laboratories are an essential part of Web-based engineering lecturing, enabling future engineers to work with lab tools that otherwise would not be accessible to them. Furthermore, they allow sharing expensive resources among multiple community researchers. During this work, a remote laboratory for the test of printed circuit boards and the programming/configuration of programmable logic devices and memories through a JTAG interface was developed. This laboratory allows students to gain access to a real development board through internet, from anywhere and at anytime. This allows an efficient, more flexible, use of the available resources, while increases the availability of laboratory resources beyond lab classes. The developed remote laboratory is based on open source software and on a cheap router with OpenWrt firmware, which acts as a processing unity, one of the innovations of this work. This firmware is a Linux distribution targeted at embedded systems. The router acts as a server, which is not a common solution in the remote laboratory implementation. When compared to a normal computer, the router has a lower processing and memory capacity. However, the tests proved that it has a very good performance, and is able to cope with the demands of the remote laboratory.
Description
Keywords
OpenWrt JTAG Laboratórios remotos Pseudo-terminais Remote laboratories Pseudo-terminal
Citation
Publisher
Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto