July 2016 - Oberon - mailman3.inf.ethz.ch

Data transfer in large amounts
by Paul Reed 05 Sep '16

05 Sep '16

Dear Wojtek, > ...possible applications of the FPGA Oberon... would be > easier to develop if the SD card could be read under the workstation OS > as a regular SD card. Are there any plans to develop the common file > system which would make it possible? > ...the prime reason to develop instruments > running the FPGA Oberon OS would be to collect data...if I collect a 2GB data file > then I would like to easily and efficiently transfer it to the analysis > environment. Trickling the file through the wireless or serial is not > quite adequate in this case. Clearly. But I don't think there is anything in the pipeline which would save you work in your specific use-case very much, it's quite outside the scope of what we are doing: a 2GB file won't fit on a 64MB filesystem, for a start. Sorry! But of course Oberon presents far fewer barriers to "doing it yourself", with absolute control, than other more mainstream systems. HTH Paul

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Global font change on OLR
by Srinivas Nayak 15 Aug '16

15 Aug '16

Dear All, I found OLR easier to use while I am on Linux. I think the font size of OLR Oberon is small. How can I change the font size to a bigger one? With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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Volatile variables in Oberon
by Srinivas Nayak 02 Aug '16

02 Aug '16

Dear All, In Oberon, do we have a way to specify, if a variable is volatile? If not, how do we work around for such a need? With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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Re: [Oberon] Volatile variables in Oberon
by Chris Burrows 01 Aug '16

01 Aug '16

> -----Original Message----- > From: Oberon [mailto:oberon-bounces@lists.inf.ethz.ch] On Behalf Of > Douglas G. Danforth > Sent: Monday, 1 August 2016 4:28 AM > To: ETH Oberon and related systems > Subject: Re: [Oberon] Volatile variables in Oberon > > On 7/29/2016 10:42 PM, Jörg Straube wrote: > > TYPE MemoryMapped = POINTER TO INTEGER; > Off topic comment: > That construct is not allowed in Component Pascal. > It is not allowed in Oberon-07 based systems either e.g. Project Oberon 2013. Oberon-07 is more strict than Component Pascal as it limits the use of pointer variables to record types. Pointers to arrays are not supported.

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Unsupported or wrongly supported features in Oberon7 compiler
by Srinivas Nayak 28 Jul '16

28 Jul '16

Dear All, Two days back Paul noted a compiler feature with implementation issue. I have also seen some comments in Oberon7 compiler, saying that some features are not implemented. Do we know or have a list of such features? If that is known, I think, some of our friends can suggest fixes for it. With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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Re: [Oberon] How2 calculate First and Follow and check if LL(1)
by John R. Strohm 26 Jul '16

26 Jul '16

As I recall, ANTLR generates parsers for LL(1) languages. yacc generates parsers for LALR(1) languages. COCO/R generates parsers for LL(k) languages. There is an old version for Oberon. Wirth strongly prefers handmade recursive descent parsers, in part because languages that can be parsed easily by a handmade recursive descent parser tend to be quite a bit simpler and cleaner than languages that "requires" a machine-built LR(1) (or higher: JOVIAL was LR(2), if I remember correctly) parser. PASCAL, Modula-2, and Oberon certainly meet that criteria when compared to C and C++ and their ilk. --- sinu.nayak2001(a)gmail.com wrote: From: Srinivas Nayak <sinu.nayak2001(a)gmail.com> To: ETH Oberon and related systems <oberon(a)lists.inf.ethz.ch> Subject: Re: [Oberon] How2 calculate First and Follow and check if LL(1) Date: Mon, 18 Jul 2016 22:38:36 +0530 Dear Jorg and John, You both are correct. At least I got to know that we have EBNF parsing program. But we don't have a program to calculate First and Follow. Otherwise, you already would have mentioned it... Nicely without mentioning the word LL(1), professor Wirth explained what should be the characteristics of a language, so that it can easily be parsed using recursive descent parsing. He gave 3-4 rules of thumb and manually calculated First and Follow. No doubt, with Oberon like small/elegant language, one doesn't need to use machine to calculate First and Follow and to check LL(1) mechanically. It can be done manually. Mechanically calculating First and Follow is mostly needed for table driven parsers. For us not. I could see, because of unwanted complexity, Wirth intentionally refrained from detailing those and using the mechanical means, which is never needed for language implementer, but rather needed for the language designer, when language is LL(1). But I was little curious if we already have any mechanized program; so that, in case I want to play creating dialects of Oberon, I will have easy means to check my dialect. Another angle to my query was, if these algorithms can easily be inter woven with our EBNF parser... Those books present the algorithm in purest form. But I wanted to know, if using attributed grammar and our EBNF parser, it is easy to get the job done... If yes, how should we start about it. And yes, from another angle, I wanted to know, if someone has ever tried to do so... With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/ On 07/18/2016 06:01 PM, John R. Strohm wrote: > Calculation of First and Follow is covered in the Green Dragon Book. I'd expect it to be covered in the later books as well. > > And, as always, Google is your FRIEND. "first follow sets" > > -----Original Message----- From: Srinivas Nayak > Sent: Sunday, July 17, 2016 8:52 PM > To: ETH Oberon and related systems > Subject: [Oberon] How2 calculate First and Follow and check if LL(1) > > Dear All, > > Lets say I want to modify Oberon language. > I would then like to check if my modified language is LL(1). > Towards that end, I would also like to calculate First and > Follow set of symbols for each of my non-terminals. > > I see a nice program EBNF.Mod > How can I modify this program to > 1. calculate First and Follow set of symbols for each of my non-terminals. > 2. check if my language is LL(1) > > > > With thanks and best regards, > > Yours sincerely, > Srinivas Nayak > > Home: http://www.mathmeth.com/sn/ > Blog: http://srinivas-nayak.blogspot.in/ > -- > Oberon(a)lists.inf.ethz.ch mailing list for ETH Oberon and related systems > https://lists.inf.ethz.ch/mailman/listinfo/oberon > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > -- > Oberon(a)lists.inf.ethz.ch mailing list for ETH Oberon and related systems > https://lists.inf.ethz.ch/mailman/listinfo/oberon > -- Oberon(a)lists.inf.ethz.ch mailing list for ETH Oberon and related systems https://lists.inf.ethz.ch/mailman/listinfo/oberon

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Embedded RISC5 Project Oberon now running @ 50Mhz
by Chris Burrows 24 Jul '16

24 Jul '16

We are currently running the latest version of embedded Project Oberon at 50MHz (i.e. twice the Project Oberon workstation clock speed) on Digilent's Artix-7 based Arty development board. This version was developed using Version 6.0 of the Astrobe for RISC 5 IDE and Xilinx's Vivado FPGA development suite both of which are available for no cost. Other new features included since the Dec 2015 Astrobe / Arty release are: * Supports the latest (March 2016) revision of the Oberon Language * Uses the latest Project Oberon source code * Updated Verilog code includes support for the Arty buttons and switches * Uses the Opus-2 MicroSD card adapter which was designed specifically for use with Project Oberon: http://www.astrobe.com/forum/viewtopic.php?f=13&t=503 Register your details if you want to be notified when this version of Astrobe for RISC5 is available at: http://www.astrobe.com/RISC5 Regards, Chris Burrows CFB Software http://www.astrobe.com

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How2 calculate First and Follow and check if LL(1)
by Srinivas Nayak 20 Jul '16

20 Jul '16

Dear All, Lets say I want to modify Oberon language. I would then like to check if my modified language is LL(1). Towards that end, I would also like to calculate First and Follow set of symbols for each of my non-terminals. I see a nice program EBNF.Mod How can I modify this program to 1. calculate First and Follow set of symbols for each of my non-terminals. 2. check if my language is LL(1) With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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Location of window for OLR.
by peter＠easthope.ca 19 Jul '16

19 Jul '16

Hello Peter M. and anyone interested, In http://oberon.wikidot.com OWIDTH and OHEIGHT are noted. I start OLR with this. export OWIDTH=1140 OHEIGHT=830 ; cd ~/olr ; ./oberon Then I drag the window to the preferred location. Does the syntax allow specification of a window location? Thanks, ... Lyall E. -- 123456789 123456789 123456789 123456789 123456789 123456789 123456789 Tel +1 360 639 0202 http://easthope.ca/Peter.html Bcc: peter at easthope. ca

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On a code generated for Math.Mod.txt
by Srinivas Nayak 15 Jul '16

15 Jul '16

In math.Mod.txt we see q0 = 9.9999999E-1; IF ODD(n) THEN f := (((((q6*yy + q5)*yy + q4)*yy + q3)*yy + q2)*yy + q1)*yy + q0 ELSE For the last addition of q0, I see the code generated is: 61003F7F MOV' R1 R0 16255 4116FFFE IOR R1 R1 -2 How it is different from 61003F80 MOV' R1 R0 16256 With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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