LPTScope software

From: "Saved by Internet Explorer 11" Subject: LPTScope software Date: Mon, 4 Jul 2016 10:12:23 -0700 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01D1D5DC.8EF81740" X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01D1D5DC.8EF81740 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: file://C:\Users\R&D 1\Documents\Research\Software\LPTScope software.htm LPTScope software=20 =20 =20 =20 =20 =20 =20 =20 Download=20 LPTScope
Download=20 source

LPTscope is a MFC program written in VC++6.0.
The = program=20 reads directly from I/O adress 888 which is LPT1 data port on most PCs. = If you=20 use Win95/98/ME everything is ok about direct reading from the LPT1. = But with=20 WinNT/2k/XP (NT based) things are a little complicated. I/O ports are = protected=20 from direct access. You can read this=20 article for detailed info.
To work under NT based OS, LPTScope = uses PortTalk = driver for=20 direct access to LPT1 port under WinNT based OSes. Craig Peacock did a = nice job=20 with that.
But, the driver intermediator reduces the speed = performance of=20 the oscilloscope a lot. For best performance use Win95/98/ME. Somebody = could=20 make a change in the code of PortTalk driver to do a block reading, not = just=20 byte by byte reading. I don't have time enough for that. The init part = of the=20 program (CMainFrame::OnShowWindow) detects Win version and if this is = NT based=20 Windows then PortTalk is automatically installed and started. If you = want to=20 uninstall the PortTalk driver just delete the file=20 \WinNT\system32\drivers\porttalk.sys and registry key:=20 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PortTalk].
To=20 uninstall the LPTscope program, just delete the LPTscope.exe = file.
The init=20 part of the LPTscope also measures the PC speed. This is achieved by a = simple=20 times-of-loops counting in a given period. This information gives us = the max=20 sample rate possible on the given machine.
LPTscope reads the = samples at the=20 maximum speed all the time. By changing the time base we don't make any = difference on the reading speed of the samples. The efect of changing = the time=20 base is implemented at display-time only: not all the samples are shown = in the=20 case of lower time base than the max one.

The principle of the = how the=20 program works is quite simple: A separate thread (ReadThread()) reads a = block=20 of MAX_SAMPLES samples from LPT1 and after that it sends a notification = to the=20 view to display this freshly readen block of data. The user can change = time and=20 Y base on the view side, click and move to measure precisely the signal = with=20 the mouse, change trigger properties etc.

The program is tested = on=20 Win98,Me,2K and XP.
I hope you will find it useful.
Drop me a = note if=20 you find a bug or after making some meaningful change to the code. Read = the=20 agreement if you intend to have any other use than a personal=20 one.

TODO:
=B7 Detection of = the=20 available LPT ports.
=B7 Optimize the PortTalk driver for our = specific use.=20 This could be useful and faster when running on=20 WinNT.

How=20 to talk with a LPT (and any other) port from within NT based = Windows:
PortTalk = driver - my=20 favorite
http://egor.spb.ru/doc/BookCD/DrDobbs/articles/1996/9605/9605a/9= 605a.htm
http://64.113.35.210/tviclpt.ht= m - a=20 serious commercial solution =20

=20 =20

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