On 01/04/2014 10:22 AM, loonsailor wrote:
> When I sudo, I no longer get an error on the modprobe (duh!), but it still
> doesn't make a device at the /dev level, like /dev/ttyusb0 or similar.
> Should it? Or should I just have my software, which expects a serial
> device (it's talking to a weather station) directly access
> /dev/bus/usb/001/003. If I want a tty-type device, is it enough to 'ln -s
> /dev/bus/... /dev/ttyUSB', either manually or with udev, or does a
> usb-serial device need some sort of pseudo-driver for serial protocols?
>
> Thanks again!
Hi,
you might want to take a look at 'dmesg' to see if a device is created
when inserting the kernel module.
This is what I get when connecting a pl2303 based usb-rs232 adapter:
- (desktop x86 machine):
~$ uname -a
Linux antec 3.8.0-34-generic #49-Ubuntu SMP Tue Nov 12 18:00:10 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
~$ lsb_release -a
LSB Version:
core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID: Ubuntu
Description: Ubuntu 13.04
[83848.138366] usb 2-1.8.6: new full-speed USB device number 8 using
ehci-pci
[83848.231040] usb 2-1.8.6: New USB device found, idVendor=067b,
idProduct=2303
[83848.231045] usb 2-1.8.6: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[83848.231047] usb 2-1.8.6: Product: USB-Serial Controller
[83848.231050] usb 2-1.8.6: Manufacturer: Prolific Technology Inc.
[83848.231337] pl2303 2-1.8.6:1.0: pl2303 converter detected
[83848.232879] usb 2-1.8.6: pl2303 converter now attached to ttyUSB0
- (beaglebone black)
~$ uname -a
Linux bb2 3.8.13-bone28 #1 SMP Fri Sep 13 01:11:14 UTC 2013 armv7l
armv7l armv7l GNU/Linux
~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 13.10
[ 472.737991] usb usb1: usb wakeup-resume
[ 472.738086] usb usb1: usb auto-resume
[ 472.738138] hub 1-0:1.0: hub_resume
[ 472.738259] hub 1-0:1.0: port 1: status 0101 change 0001
[ 472.840661] hub 1-0:1.0: state 7 ports 1 chg 0002 evt 0000
[ 472.840787] hub 1-0:1.0: port 1, status 0101, change 0000, 12 Mb/s
[ 472.946041] usb 1-1: new full-speed USB device number 2 using musb-hdrc
[ 473.065944] usb 1-1: default language 0x0409
[ 473.066357] usb 1-1: udev 2, busnum 1, minor = 1
[ 473.066401] usb 1-1: New USB device found, idVendor=067b, idProduct=2303
[ 473.066439] usb 1-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 473.066473] usb 1-1: Product: USB-Serial Controller
[ 473.066505] usb 1-1: Manufacturer: Prolific Technology Inc.
[ 473.071233] usb 1-1: usb_probe_device
[ 473.071294] usb 1-1: configuration #1 chosen from 1 choice
[ 473.072221] usb 1-1: adding 1-1:1.0 (config #1, interface 0)
[ 473.080129] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 473.080247] hub 1-0:1.0: port 1 enable change, status 00000103
[ 473.175207] usbcore: registered new interface driver usbserial
[ 473.175427] usbcore: registered new interface driver usbserial_generic
[ 473.175638] usbserial: USB Serial support registered for generic
[ 473.193055] usbcore: registered new interface driver pl2303
[ 473.193317] usbserial: USB Serial support registered for pl2303
[ 473.193446] pl2303 1-1:1.0: usb_probe_interface
[ 473.193487] pl2303 1-1:1.0: usb_probe_interface - got id
[ 473.193564] pl2303 1-1:1.0: pl2303 converter detected
[ 473.206726] usb 1-1: pl2303 converter now attached to ttyUSB0
As you can see, there's a ttyUSB0 device being created. Can you show
what you get from 'dmesg' or /var/log/kern.log ?
Cheers,
Nuno
--
http://aeminium.org/nuno/
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