USB peripherals are plugged in across time: how are /dev/ttyUSBx assignations done?
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From: Merciadri Luca on 4 Jul 2010 20:40 Hi, Let's say that you progressively plug in USB peripherals in(to) USB ports of one computer running Debian. How are the /dev/ttyUSB0, /dev/ttyUSB1, etc., assignations achieved? Is /dev/ttyUSB0 the first plugged device, or is it one in a specific port? Thanks. -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ I use PGP. If there is an incompatibility problem with your mail client, please contact me.
From: Merciadri Luca on 5 Jul 2010 07:20 Because if I can know it by theory, it avoids me `practice.' :) Lisi wrote: > On Sunday 04 July 2010 13:06:51 Merciadri Luca wrote: > >> Let's say that you progressively plug in USB peripherals in(to) USB >> ports of one computer running Debian. How are the /dev/ttyUSB0, >> /dev/ttyUSB1, etc., assignations achieved? Is /dev/ttyUSB0 the first >> plugged device, or is it one in a specific port? Thanks. >> > > Why not just suck it and see? > -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ I use PGP. If there is an incompatibility problem with your mail client, please contact me. The exception proves the rule.
From: Merciadri Luca on 5 Jul 2010 07:20 Celejar wrote: > Not sure what kind of peripherals you have in mind, but they generally > won't get ttyUSBn addresses, unless they're USB-serial converters, > which contain chips meant to provide a serial / TTY interface to the > system. > And which addresses would they get, if they were not using /dev/ttyUSBx? > In any event, I'm pretty sure that the system will assign an available > address, generally independent of the port, unless you have a udev rule > telling it otherwise. > Okay. -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ I use PGP. If there is an incompatibility problem with your mail client, please contact me. If it's too good to be true, then it probably is.
From: Merciadri Luca on 5 Jul 2010 12:30 Camaleón wrote: > On Mon, 05 Jul 2010 13:17:11 +0200, Merciadri Luca wrote: > > >> Celejar wrote: >> >>> Not sure what kind of peripherals you have in mind, but they generally >>> won't get ttyUSBn addresses, unless they're USB-serial converters, >>> which contain chips meant to provide a serial / TTY interface to the >>> system. >>> >>> >> And which addresses would they get, if they were not using /dev/ttyUSBx? >> > > Block devices (external DVD players or hard disks, USB flash, digital > still cameras, voice recorders and many, many devices...) do not create "/ > dev/ttyUSBx" but get mounted under "/media" (that is, standard "/dev/sdx" > naming). > > Modems (gsm/umts/dial-up) devices and printers do it that way (in fact, > anything that emulates the "serial" port). > Thanks, but I should have mentioned that I'm here speaking about non-block devices (such as data probes, etc.). Are they automatically recognized and set up as /dev/ttyUSBx? -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ I use PGP. If there is an incompatibility problem with your mail client, please contact me.
From: Merciadri Luca on 5 Jul 2010 12:40
Lisi wrote: > On Sunday 04 July 2010 13:06:51 Merciadri Luca wrote: > >> Hi, >> >> Let's say that you progressively plug in USB peripherals in(to) USB >> ports of one computer running Debian. How are the /dev/ttyUSB0, >> /dev/ttyUSB1, etc., assignations achieved? Is /dev/ttyUSB0 the first >> plugged device, or is it one in a specific port? Thanks. >> > > Managed to send my reply to Merciadri alone, again. Sorry, Merciadri. I have > to change the habit of years and press "l" (ell) instead of clicking > reply. :-( > > My reply was: > > Why not just suck it and see? No problem. I could do it, but I thought such behaviors were already pre-defined by the kernel's implementation, weren't they? -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ I use PGP. If there is an incompatibility problem with your mail client, please contact me. |