P. vanderWal wrote:
----- Original Message ----- From: "Mark Morgan Lloyd"
<markmll.fpc-pas...@telemetry.co.uk>
To: <fpc-pascal@lists.freepascal.org>
Sent: Wednesday, July 27, 2011 10:36 PM
Subject: Re: [fpc-pascal] How to detect serial/usb-serial ports.
P.vanderWal wrote:
Debian and Ubuntu
grtjs Piet
----- Original Message ----- From: "Felipe Monteiro de Carvalho"
<felipemonteiro.carva...@gmail.com>
To: "FPC-Pascal users discussions" <fpc-pascal@lists.freepascal.org>
Sent: Wednesday, July 27, 2011 10:39 AM
Subject: Re: [fpc-pascal] How to detect serial/usb-serial ports.
For which operating system?
I'd expect (recent versions of) those to only create devices that were
known to exist. I detect what's available by looking for up to 12
/dev/ttyS*, 8 /dev/ttyUSB* and 4 /dev/ttyI*, then later checking that
they can actually be opened (bearing in mind that this might glitch a
control line).
It's worth noting that a few weeks ago I was updating the standard
serial.pp unit and noticed that Solaris designated serial ports as
/dev/ttya and /dev/ttyb.
Windows of course is \COM1, or strictly \\.\COM1 etc.; I note Fabio's
test but in the past have used the registry to find e.g. named ports
simulated by an AVR box.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or
colleagues]
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I'll use Mark's method of com-port detection in my program under linux and
GetComPorts under Windows. In a few days time I'll let you know the result.
Mark thank for the suggestions.
I was discussing this elsewhere a few days ago and a Windows developer
pointed out to me that the Windows COMn names are simply a convention,
and that a driver writer can choose whatever he wants. A bit of Googling
suggests that HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM is worth
looking at, but I don't know how portable (i.e. over different versions
and variants of Windows) that is.
Google also suggests that in some cases (Bluetooth?) the registry might
append a garbage character, and that possibly reading it multiple times
might improve things.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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