Re: Unsigned in Component Pascal

From: [at]} <Wojtek>
Date: Tue, 18 Jun 2002 09:54:46 -0400 (EDT)

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Content-type: text/plain

Robert:

  thanks a lot for your examples. I am already talking
to the EZ-USB-FX chip over the kernel32, but I am sure
there will be more such nitty-gritty details down the road,
and I do appreciate your showing me how to do the nominally
low-level stuff in a CP way, not the C way.

In my other project, am also now talking to a CAMAC SCSI
controller, and the DLL I am using is sometimes crashing.
I need to guard against wrong bits being sent to that buggy
DLL. Again, your example will be helpful.

It would be nice if the BlackBox web site contained
practical notes and Application Notes section. You see,
it is terrific to have this safe and abstract system.
But then I want to use it for something practical like
talking to an embedded ucontroller. Or processs binary
data coming from some other software system. Or something
of that sort. The examples they give are nice and many,
but "low-level" stuff does not seem to be covered. I do not
blame the company for not showing us everything imaginable.
Other companies have found a practical solution: a section
on their web site with practical notes, enginnering notes,
and application notes, contributed by their own staff
and perhaps also by the users. Look at the Analog Devices
web site. I know that ADI is a large company while
OuS is small, but I also do not expect to see hundreds
of notes.

Our company has left this to outside voluteers, what has
its limits. A more formal approach could perhaps be helpful.
Would be nice if the "knowledge base" on their website
was expanding. (Look at the Xilinx website, they have
a "knowledge base" section.)

Thank you again,

Wojtek Skulski skulski{([at]})nowhere.xy

On Tue, 18 Jun 2002 robert.d.campbell{([at]})nowhere.xy

> Wojtek
>
> I've sent the message below to the mailing list
> twice, but have not received my copy. Let me know
> if you get this please.
>
> Cheers
>
>
>
> Wojtek Skulski wrote
>
> >"My more immediate concern is how to make assignments of bit patterns
> >such as 0ABH to a variable of a given bit width. These variables are
> >directly mapped onto C-style DLL variables like UCHAR or USHORT.
> >I have spent considerable time reading C-headers and trying to match
> >these to variable types CP is giving me. The interesting part is
> >C structures and pointers to C structures.

>
> >Unless I am missing some part of the BlackBox docu, it seems to me
> >they have basically left this whole topic away. There is a page
> >about DLLs, but practical details are scarce.

>
> >In the past, every compiler vendow would have documented the bit
> >layout of their variables. This would make interfacing between
> >say Fortran and C doable. The BB documentatin does not say much
> >how their variables are laid out in memory. This becomes a critical
> >issue once I want to talk to an embedded 8051 microcontroller."

>
>
> The BB documentation addresses variable layout in memory and on disk
> in the language reference and Stores Docus. The mapping of memory bit
> numbers to (eg) INTEGERs is not documented as it might be platform
> specific.
>
> However bit 5 in a set is bit 5 whatever platform is used. It is an
> open secret that on PC's bit 0 is the LSB. What I gues you want to do
> is to set (and process) your bits using the SET abstraction, then map them
> to BYTEs using SYSTEM.VAL in a potentially platform specific way. (Maybe
> some SHORTs are also needed.)
>
> The example below uses this kind of approach to compute a file checksum
> using a 32 bit irreducible polynominal over Galois Field 2 - sounds fancy
> but is simple bit bashing. Setting the bit patterns using the SET
> abstraction is easy; as is converting in and out of INTEGER when required.
>
>
>
> PROCEDURE CheckFile (loc : Files.Locator; fInfo : Files.FileInfo) : INTEGER;
> CONST
> fDatSiz = 102400 * 2;
> mask = {0, 1, 27, 28};
> lowByte = {0 .. 7};
> VAR
> i : INTEGER;
> fIn : Files.File;
> rd : Files.Reader;
> fData : ARRAY fDatSiz OF BYTE;
> cSum : SET;
> BEGIN
> IF ~zpr.cSum OR (fInfo.length > fDatSiz) THEN RETURN 0 END;
> fIn := dir.Old (loc, fInfo.name, TRUE);
> IF fIn = NIL THEN RETURN 0 END;
>
> ASSERT (fIn.Length () = fInfo.length, 65);
> rd := fIn.NewReader (rd);
> rd.ReadBytes (fData, 0, fInfo.length); INC (xCnt, fInfo.length);
>
> cSum := {0};
> FOR i := 0 TO fInfo.length - 1 DO
> cSum := cSum / (SYSTEM.VAL (SET, fData [i]) * lowByte);
> IF 31 IN cSum THEN
> cSum := SYSTEM.LSH (cSum, 1);
> cSum := cSum / mask
> ELSE
> cSum := SYSTEM.LSH (cSum, 1)
> END
> END;
> fIn.Close ();
> RETURN SYSTEM.VAL (INTEGER, cSum)
> END CheckFile;
>
>
> Regards
>
>
> Robert Campbell
>
>
> (Aplogies if this is a repeat.
> I sent this yesterday but did not receive my copy!)
>
>

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Received on Tue Jun 18 2002 - 15:54:46 UTC

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