Thanks, that sort of works, but only sort of... here is the portmon
trace - it turns out that the open won't quite work, and nothing is
output until the port is being closed - looks like some setup of the
port is missing (eg setting output buffer size). Is there any more
info available on that? I understand that communications are always a
pitb to implement; lots of OS specific issues and device specific trap
doors to fall into, so if that's not sufficiently covered, I'll have
to think of something else...
Thanks for the ultrafast response!
btw, I was aware of the double slash/backslash issue, just omitted it
in the initial post for readablitie's sake. I remembered that in other
contexts, the backslashes are rejected by Racket, so it didn't occur
to me that it might work here...
7 17:12:28 Racket.exe IRP_MJ_CREATE VCP0 SUCCESS
Options: Create
8 17:12:28 Racket.exe IRP_MJ_QUERY_VOLUME_INFORMATION VCP0 INVALID
DEVICE REQUEST
9 17:13:28 Racket.exe IRP_MJ_WRITE VCP0 SUCCESS Length 16: 33 33 33 33
33 33 33 33 33 33 33 33 33 33 33 33
10 17:13:28 Racket.exe IRP_MJ_CLEANUP VCP0 SUCCESS
11 17:13:28 Racket.exe IRP_MJ_CLOSE VCP0 SUCCESS
Quoting PM responder:
Try using backslashes instead of forward slashes-- "\\\\.\\com1". And
you need doubled backslashes because \ is an escape character in the
string.
On Tue, Mar 13, 2012 at 12:00 PM, Rüdiger Asche
<r...@ruediger-asche.de> wrote:
Hello,
Section 12.1.5 of the docs suggests that it should be possible to
use file ports for accessing serial communications, such as
(define-values (inport outport) (open-input-output-file "com1"))
That works, but
inport
#<input-port:c:\personal\racket\v1.1\com1>
and likewise
outport
#<output-port:c:\personal\racket\v1.1\com1>
which means in theory and practice that Racket creates a file
called com1 in that directory to which the I/O is performed instead
of using the serial port. I tried uppercase and lowercase as well
as /./COM1, all with the same results (except that sometimes the
port was created in the root). So how does the file name have to be
specified to redirect the I/O to a serial port?
On a related note, is it possible to access/set the comm parameters
(baud rate, handshaking and so on) of a specified port using Racket?
Thanks again.
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