Brian Dessent wrote: > > Nefastor wrote: > >> (...) I don't know which of Cygwin's /dev/tty device corresponds to which >> serial >> port on my PC (that is, I only know the COM port number). I can "sort of >> guess" /dev/tty0 is COM1, but that's a guess, and I'd prefer some >> certainty. > > Cygwin works the same as Linux, /dev/ttyS0 is the first serial device, > /dev/ttyS1 is the second, etc. Please consult the users guide: > <http://cygwin.com/cygwin-ug-net/using-specialnames.html>. > >
That I have, Brian. What itches me is that I'm facing some kind of special case : My machine has two serial port, one on the MoBo and a USB-serial adapter, yet Windows calls them COM1 and COM3. I've searched the whole Device Manager but couldn't find any device that would be COM2. And I can rename COM1 to COM2. Speaking of Windows' DM, it's rather quirky on the serial ports : I noticed that if I unplug my USB cable (COM3) and try to change the name of COM1, in the drop down box COM3 is listed as "in use" :confused: %-|. So, I have a machine with two serial ports but no COM2, AND I can change the COM port number to whatever I want, plus Windows seems to have a bad case of "phantom limb syndrome". Getting back to your answer : how can know for sure what Cygwin calls "the first port", or "the second port" ? Trial and error is obviously not what I'm after, rather I need a way for my program to know for sure what port it's dealing with. To help me write that program I'd need to know : - is there a fixed relationship between COM port number "X" and dev/ttyS number "Y", such as Y = X - 1 ? For instance, if I change my COM port number from 3 to 7, will the dev/ttyS number go from 2 to 6, or will it remain unchanged ? - if it remains unchanged, I'm assuming Cygwin does some sort of port enumeration : is that process deterministic ? Additionally, can you point me to documentation on how to retrieve device / driver info from my program ? That way, worst case scenario, I can have the program look for the correct port on its own. Thank you for your time, I know I'm asking for a lot of stuff but I've got the feeling the answers would be useful to many.:-) Nefastor -- View this message in context: http://www.nabble.com/Looking-for-basic-documentation-on-Cygwin-and-Serial-Ports-tp16827997p16853883.html Sent from the Cygwin list mailing list archive at Nabble.com. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
