[rtl] CFP: OMER-2 - Object-oriented Modeling of Embedded RT-Systems
CALL FOR POSITION PAPERS O M E R - 2 Object-oriented Modeling of Embedded RT-Systems (http://ist.unibw-muenchen.de/GROOM/OMER-2/) 10 - 12 May 2001 Herrsching am Ammersee 9th Workshop of Working Group "GROOM: Foundations of OO Modeling" of the "GI-Fachgruppe 2.1.9" "OOSE: OO-Software-Entwicklung" * * * SCOPE The importance of embedded real-time (RT) systems for our daily life is rapidly increasing. Important application areas are e.g. the aerospace, automotive, chemical process engineering, and telecommunications industry. In all these areas the complexity and functionality of functions realized in software increases rapidly. Often this software is still developed using software engineering technologies of the eighties. As a consequence, it does not fulfill our expectations concerning maintenance and reusability of developed subcomponents. Furthermore, it often suffers from a separation of functions and data. These are the reasons why object-oriented (OO) approaches are needed that facilitate the development of reusable software components, which hide data and functions behind well-defined interfaces. The workshop OMER-2 addresses all aspects of the development and application of object-oriented methods (languages, tools, processes) for the design and implementation of embedded RT systems. Its main purpose is to serve as a platform for academics and industry as well as for tool (method) developers and users to exchange their experiences in this field and to discuss new trends. A further intention is to clarify a research agenda for the OO development of embedded RT software, allowing academics to focus their efforts and practitioners to reflect their daily business. FORMAT OMER-2 is planned to be an "informal" workshop (similar to its predecessor) with a limited number of participants (authors of position paper submissions will be preferred), invited talks of distinguished experts, short presentations of accepted submissions, a modeling contest, and ample time for discussions and working subgroups on different topics. INVITED SPEAKER * Bruce Douglass (I-Logix, Andover) MODELING CONTEST (http://www.automotive-uml.com/mc/) The workshop is accompanied by a modeling contest. The best models will be honored with prize money and be presented at the workshop. SUBMISSIONS Position papers of four to six pages pertaining to all aspects of OO embedded RT system modeling are sought, not limited to the following: * Architectural styles, patterns, ... * Code generation from models * Development of reusable components * Experience reports of OO projects * Extensions of OO modeling languages * Testing and verification strategies Submissions should be sent as pdf- or ps-files to mailto:[EMAIL PROTECTED] The proceedings of OMER-2 will be published as a technical report. Authors of selected submissions will be invited to submit a journal paper version after the workshop. DEADLINES Deadline for position papers: March 1st, 2001 Notification of authors: April 1st, 2001 Registration for workshop:April 11th, 2001 LOCAL ORGANIZATION A. Schuerr ([EMAIL PROTECTED]) Institute for Software Technology University of the Federal Armed Forces, Munich D-85577 Neubiberg, Germany PROGRAM COMMITTEE P. Hofmann, DaimlerChrysler, Esslingen (co-chair) A. Schuerr, University Bw, Muenchen (co-chair) M. von der Beeck, TU Muenchen M. Cohen, I-Logix, Andover W. Damm, OFFIS, Oldenburg G. Engels, University of Paderborn M. Fuchs, BMW, Muenchen D. Hogrefe, University of Luebeck J. Hooman, University of Nijmegen J. Kaiser, Universitaet Ulm B. Moller-Pedersen, Ericsson AS, Billingstad U. Pansa, Telelogic Germany A. Radermacher, Siemens AG, Muenchen R. Resch, Berner Mattner GmbH, Muenchen St. Schmerler, FZI Karlsruhe B. Selic, ObjecTime Limited, Kanata A. Shaw, University of Washington, Seattle H.-Ch. von der Wense, Motorola GmbH, Muenchen J. Ziegler, Nokia, Helsinki -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] Object-oriented Real-Time Modeling Contest
CALL FOR PARTICIPATION "Object-oriented Real-Time Modeling Contest" http://www.automotive-uml.com/mc/ * * * Which benefits do object-oriented approaches provide to the design of embedded real-time systems? This question still holds great challenges for both researchers and practitioners. The modeling contest opens an arena in which anyone committed to this area gets the chance to produce evidence of her ideas. He shall demonstrate his approach on a concrete task geared for vehicles. Participation requires the submission of a documented model and an implementation of a typical automotive control function according to a given specification. For details please have a look at our website. The best models will be honored with prize money and be presented at the OMER-2 Workshop (see http://ist.unibw-muenchen.de/GROOM/OMER-2). Furthermore, the winners will visit the DaimlerChrysler Research and Technology Center as well as a production site of Mercedes Benz cars. We ask anybody who is interested in participating to register on our website until August 15, 2000. * * * For further information please see: http://www.automotive-uml.de/mc/ -- Dr. Peter Hofmann email: [EMAIL PROTECTED] Group for System Design fax: 0711 17 41047 DaimlerChrysler Research Technology -- Prof. Dr. Andy Schuerr Institute for Software Technology, Department of Computer Science University of the German Federal Armed Forces, Munich 85577 Neubiberg, Germany Tel.: +49 89/6004-2220 (-2263/-3352) FAX: +49 89/6004-2448 or +49 89/6004-3560 email: [EMAIL PROTECTED] WWW: http://ist.unibw-muenchen.de/schuerr/ -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] soft_irq_handlers
hi there! first: thanks for your help so far - my plc is ticking like an atomic clock, working really great now. worst jitter so far around +/- 40 microseconds, quite a bit better than our NT-Version of the same plc, only that my machine has only half the processor power :-) And another question, of course: I need to install a soft_irq handler. I read the man pages, the examples and did it like it is done there. But when my module is supposed to run into the handler, the whole system is locked solid. I'm on learning about kernel debugging at the moment, but if there is a common mistake newbies tend to make, I'm sure to have made it too. Any suggestions? At the moment, the handler is only supposed to call a bottom half which calls printk - can i use printk in a bottom half? thanks Daniel -- [EMAIL PROTECTED] Student of Communication Engineering/Computer Networking Furtwangen University of Applied Sciences -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] Comedi and Minirtl...
On Wed, 12 Jul 2000, Herman Bruyninckx wrote: We are trying to make MiniRtl floppies with Comedi drivers. But Comedi seems to need the libc, which is a couple of megabytes big. Is there another, much smaller ``embedded'' libc available? Is newlib from Cygnus such an alternative? Would it be possible to use it together with Comedi? 1) Try statically linking Comedi, it may be using only a small part of the library. 2) Newlib is a C library, but not a Linux C library, i.e., it has none of the system calls. If Comedi does not need those, perhaps you could make newlib work. -- Pete Buechler : SuSE Labs Work e-mail : [EMAIL PROTECTED] Work web page : http://www.suse.com/~peterb Personal e-mail : [EMAIL PROTECTED] -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] Win32 hosted Cross-Compiler for RTLinux
Hello Realtimers, It would be fine (for my project) if I could compile RTLinux modules on MS Windows. So my question: Is there a Win32 ( Windows95 or Windows NT) hosted GCC cross-compiler. And is it suitable for RTLinux module developing. Thanks James -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] Re: system frozen with comedi and higher freq
On Mon, Jul 10, 2000 at 09:48:57AM +0200, Olaf Petzold wrote: Hallo, some times ago I started this thread. Now some days later I had the time to verify some things (with new comedi-0.7.45, mbuff-6.6), e.g. the hint of using the right gcc: # cat /proc/version Linux version 2.2.14-rtl2.2 (root@rtreg) (gcc driver version 2.95.2 19991024 (release) executing gcc version 2.7.2.3) #10 Mit Jul 12 09:57:32 CEST 2000 So I recompiled the kernel, module, mbuff and comedi with the gcc 2.7.2.3 (without smp support). I insmoded the module from runlevel 1: About 4 kHz the systems slows down. About 4.5 kHz I will get into troubel, while rmmod the rtreg I got a lot of kernel oops (see attachement). Whats going on ? The first oops appears to be caused by some code in the kernel attempting to jump to a user-space address. This could either be due to memory corruption or dangling pointers. Could you send me your code, so I can crash my computer? dave... -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] Comedi and Minirtl...
On Wed, Jul 12, 2000 at 10:06:08AM -0700, Pete Buechler wrote: On Wed, 12 Jul 2000, Herman Bruyninckx wrote: We are trying to make MiniRtl floppies with Comedi drivers. But Comedi seems to need the libc, which is a couple of megabytes big. Is there another, much smaller ``embedded'' libc available? Is newlib from Cygnus such an alternative? Would it be possible to use it together with Comedi? 1) Try statically linking Comedi, it may be using only a small part of the library. libcomedi hits some rather sensitive areas of glibc, so statically linking anything causes binary sizes of about 300 kB. It shouldn't be too hard to knock this down in some cases, i.e., changing a sscanf() to strtol() dropped the average binary size of the demos to 240 kB. Think I'll keep that change. dave... -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] TSC , 8254, and such
Tue, 11 Jul 2000 daniel sheltraw wrote:
Paolo
Let me see if I got oneshot mode straight. Does it go something like this:
set up one-shot mode for 8254
loop
get time from TSC
compute time until next oneshot task scheduled
program 8254 with this time
{which generates interrupt from counter 0 after count down}
end loop
Q: What if the time computed until next task is greater than 2^16/frequency
(8254 hits turns over)? Who is that interval timed?
One way to do it: Set up a dummy thread hat gets sheduled after 2^16 8254
clocks, unless there are any real threads to schedule within that time. The
dummy thread should just go back to sleep when scheduled, as it's just meant as
an excuse to run the scheduler. It could be a special case in the scheduler,
rather than a real thread.
That should keep the scheduler alive and working, even if no one bothers to
run it explicitly until the "long into the future" thread is scheduled.
David Olofson
Programmer
Reologica Instruments AB
[EMAIL PROTECTED]
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Re: [rtl] multithreaded FIFO reading app
Tue, 11 Jul 2000 b m ledvina wrote: hello again, the problem i was having has been eliminated. kinda strange it was. i was seeing bizarre behavior from a thread trying to read from a fifo, but the cause wasn't a bug, lack of know how, or a problem with V (the gui development code) Actually, when I generated the child thread, I left the paranthesis in the function name, which the compiler didn't even give a hoot about. Oops... void * is fun, isn't it! :-) Anyway, this improper addition of those little curved things caused all my woes. Troublesome is it that the thread worked somewhat, but not enitrely The reason for that was that when the statement that was supposed to set the thread up was executed, it actually *called* your thread function in order to pass it's return as the function address argument to pthread_create(). David Olofson Programmer Reologica Instruments AB [EMAIL PROTECTED] ..- M u C o S . .- David Olofson --. | A Free/Open Multimedia | | Audio Hacker | | Plugin and Integration Standard | |Linux Advocate| ` http://www.linuxdj.com/mucos -' | Open Source Advocate | ..- A u d i a l i t y . |Singer| | Rock Solid Low Latency Signal Processing | | Songwriter | `--- http://www.angelfire.com/or/audiality -' `- [EMAIL PROTECTED] -' -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] RTfifo questions
Tue, 11 Jul 2000 Flavio Cappelli wrote: Hello all, I use rtlinux v2.2 I don't understand if, when I get data from a rt-fifo (rtlinux side) with 'rtf_get' and less bytes are available than requested, these bytes are removed from the fifo or if they are removed only when ther'are enough datas in the fifo. *looking at the code* Well, it looks like you may get less data than requested, and the data you get *is* removed from the buffer. I ask this question because in the example 'frack_module.c' seems that commands are processed when entire command structure is got, without consider a loos of data when few bytes are available. It works because 1) the FIFO is expected to never be too full to accept an entire structure, and 2) as long as a full structure fits, you're OK, since the write operation won't sleep, and is therefore atomic, protected by rtl_(/end_)critical. But man page of 'rtf_get' reports that less byte than requested may be returned. Is this related with returning -EINVAL value from fifo handler ? How do you mean? You get less bytes than requested if there are less bytes than requested in the buffer at the time of the rtf_get() call, since rtf_get() cannot sleep. (It wouldn't work with ISRs if it could.) Also can a single write on rt-fifo (user side) interrupted in the middle of data transfer by fifo handler, if ther'is enough space to put the datas ? If the RT-FIFO driver conforms to the normal rules (which it does, AFAIK), the writer should block until all data has been written, or an error occurs. (Never mind the ERESTARTSYS thing - that's a little UN*X design weirdness related to scheduling and signals, and it's handled by the library that interfaces to the kernel.) So, yes, the writer will get interrupted by the handler, so that the handler can read some data, allowing the writer to wake up and continue writing later. David Olofson Programmer Reologica Instruments AB [EMAIL PROTECTED] ..- M u C o S . .- David Olofson --. | A Free/Open Multimedia | | Audio Hacker | | Plugin and Integration Standard | |Linux Advocate| ` http://www.linuxdj.com/mucos -' | Open Source Advocate | ..- A u d i a l i t y . |Singer| | Rock Solid Low Latency Signal Processing | | Songwriter | `--- http://www.angelfire.com/or/audiality -' `- [EMAIL PROTECTED] -' -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] fifo question
Hello RT world Does a fifo have to be created (using rtf_create or equivalent) in kernel-space before it can simply be opened for reading in user-space? The reason I ask is that I have been unable to open the /dev/rtf0 fifo in user-space. I am actually running the user-space program as root and the file permissions on the fifo device file are crw-r--r--. I am missing something simple. Please help. Thanks. Daniel Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] Re: Context Switching Speed - DMA.
Tue, 11 Jul 2000 Norm Dresner wrote: At 05:14 PM 7/11/2000 +0200, David Olofson wrote: Sat, 08 Jul 2000 Andrew Tuckey wrote: [...] x86 doesn't have DMA on the chip (*), but uses either the 8 DMA channels on the mainboard chipset (4 x 8 bit + 4 x 16 bit; normally used with ISA boards) or PCI busmaster DMA, which is supported by the PCI chipset but performed by the PCI cards themselves. AGP is quite similar to PCI in this respect, AFAIK. (*) exception: some x86 clones for embedded systems, with some standard chipset functionality included. That's not quite correct: The Intel 80186/80188 had integrated DMA. Yeah, I forget the 8018x! :-) IIRC, it was never user in a PC, but in varios computer peripherals. What is (closer to being) correct is that no "PC's" were produced with an x86 CPU with integrated DMA -- I'm not so sure about that... There are these micro-AT integrated main boards with all sorts of weird chips on them. I cant't remember seeing one with an "MCU x86", but I wouldn't be surprized if they exist. indeed it could be argued that if a computer had integrated DMA, then it wasn't a PC-work-alike and hence not a "PC". Disregarding that the chipset would look different, a PC with such a CPU could still work like a PC, provided the DMA controller is compatible with that PC standard thing. (Not that I would want to see that on any new hardware...!) David Olofson Programmer Reologica Instruments AB [EMAIL PROTECTED] ..- M u C o S . .- David Olofson --. | A Free/Open Multimedia | | Audio Hacker | | Plugin and Integration Standard | |Linux Advocate| ` http://www.linuxdj.com/mucos -' | Open Source Advocate | ..- A u d i a l i t y . |Singer| | Rock Solid Low Latency Signal Processing | | Songwriter | `--- http://www.angelfire.com/or/audiality -' `- [EMAIL PROTECTED] -' -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] Comedi and Minirtl...
Wed, 12 Jul 2000 Herman Bruyninckx wrote: We are trying to make MiniRtl floppies with Comedi drivers. But Comedi seems to need the libc, which is a couple of megabytes big. Is there another, much smaller ``embedded'' libc available? Is newlib from Cygnus such an alternative? Would it be possible to use it together with Comedi? Almost every boot floppy (including MiniRTL, AFAIK) that runs "normal" commands and tools has some kind of libc replacement. Size and features vary. *digging out some links* http://www.linuxrouter.org/ http://www.toms.net/rb/ http://sunsite.auc.dk/mulinux/#related_projects You may need to adjust the application to use other functions (perhaps throw in your own little helper lib) if you can't get everything you need in one libc. David Olofson Programmer Reologica Instruments AB [EMAIL PROTECTED] ..- M u C o S . .- David Olofson --. | A Free/Open Multimedia | | Audio Hacker | | Plugin and Integration Standard | |Linux Advocate| ` http://www.linuxdj.com/mucos -' | Open Source Advocate | ..- A u d i a l i t y . |Singer| | Rock Solid Low Latency Signal Processing | | Songwriter | `--- http://www.angelfire.com/or/audiality -' `- [EMAIL PROTECTED] -' -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
