From eacbf5bb4d57af21c731f41251015d3b991ad490 Mon Sep 17 00:00:00 2001 From: guest Date: Fri, 30 Nov 2007 13:41:25 +0000 Subject: final version, initial import git-svn-id: svn+ssh://mecka.net/home/svn/rtcorba-thesis@1 cba7306a-a4a0-4afd-bcb4-bd19f8a24309 --- diplomathesis/node2.html | 132 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 diplomathesis/node2.html (limited to 'diplomathesis/node2.html') diff --git a/diplomathesis/node2.html b/diplomathesis/node2.html new file mode 100644 index 0000000..07b2d04 --- /dev/null +++ b/diplomathesis/node2.html @@ -0,0 +1,132 @@ + + + + + +Abstract + + + + + + + + + + + + + + + + + + + + + +

+Abstract +

+ +

+PC based controls are getting more and more popular. +Operating Systems and a huge number of special libraries guarantee a fast development process. +Real-time communication between drives often is important in automation. +Most suitable is a Real-time communication based on standard pc hardware. +In this case there is no need to develop a special driver for each platform. + +

+Currently, there is no defined standard for a platform- and operatingsystem independet Real-time communication, in automation. +The only specification, which fulfills these needs, is OMGs Real-time CORBA. +ACE/TAO is an open source, platform-independent C++ implementation of this standard. +This thesis describes the process of research done, to check if ACE/TAO meets the requirements to be used in a industrial welding laser control, based on Real-time Linux. + +

+To measure the latency, for transmitting data between two embedded Linux systems, a test environment was build. +A square wave signal was put on a digital input of one system. +Each edge caused sending current digital port state + testdata via ethernet and Real-time CORBA to a second system. +On the second system the digital output ports where set to the state of the digital inputs on system one. +It was discovered, that 1kB data can be transmitted by ACE/TAO Real-time CORBA in 1 ms, under hard real-time conditions. +Measurements with more than 2 embedded systems and a Real-time ethernet switch were made to check, if priorisation works correctly. +As long as all components (ACE/TAO, Real-time switch, Real-time Linux) were configured in proper style, a Priority Inversion may not be evidenced. + +

+Memory Footprint in RAM was with less than 1 MB astonishing small, footprint in mass-storage with about 30 MB rather suboptimal. +The performance of the 600 MHz CPU on the embedded system satisfied all tests. + +

+A feasibility study discovers C#/.NET CORBA integration. +Most methods, available at the market, for establishing a CORBA connection out of C# were compared. +An example application to control a Real-time C++ process, out of a .NET/C#, GTK# graphical user interface, was created with mono, GTK#, IIOP.NET and ACE/TAO. +It demonstrates that it is possible to host a CORBA Object and to get access to a ACE/TAO hostet CORBA Object, out of C#. + + + +

+ +

+Manuel Traut +2007-02-25 +

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