Dotaz: /dev/ttyUSB 0 az 4

[makovec]

Zdravim, mam nekolik ruznych USB zarizeni /dev/ttyUSB[0-4] a chtel bych, aby se mi nektere z nich tvarilo jako /dev/ttyUSB0, atp. natvrdo. Nezavisle na tom kdy ktere pripojim. Nevite kde se to konfiguruje?

Odpovědi

[Sten]

Zadejte do Googlu „udev persistant rules“. Doporučuji ale nepoužívat /dev/ttyUSB[0-4], ale vytvořit si třeba /dev/mytty/USB[0-4].

Anebo můžete použít /dev/bud/usb, pokud jsou zapojená vždy do stejného portu.

[tuxmartin]

• Strc do USB to zarizeni
• zjisti si o nem podrobnosti
  

  martin@martin:~$ udevadm info -n /dev/ttyUSB0 -a
  
  Udevadm info starts with the device specified by the devpath and then
  walks up the chain of parent devices. It prints for every device
  found, all possible attributes in the udev rules key format.
  A rule to match, can be composed by the attributes of the device
  and the attributes from one single parent device.
  
    looking at device '/devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4.4/1-4.4:1.0/ttyUSB0/tty/ttyUSB0':
      KERNEL=="ttyUSB0"
      SUBSYSTEM=="tty"
      DRIVER==""
  
    looking at parent device '/devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4.4/1-4.4:1.0/ttyUSB0':
      KERNELS=="ttyUSB0"
      SUBSYSTEMS=="usb-serial"
      DRIVERS=="pl2303"
      ATTRS{port_number}=="0"
  
    looking at parent device '/devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4.4/1-4.4:1.0':
      KERNELS=="1-4.4:1.0"
      SUBSYSTEMS=="usb"
      DRIVERS=="pl2303"
      ATTRS{bInterfaceNumber}=="00"
      ATTRS{bAlternateSetting}==" 0"
      ATTRS{bNumEndpoints}=="03"
      ATTRS{bInterfaceClass}=="ff"
      ATTRS{bInterfaceSubClass}=="00"
      ATTRS{bInterfaceProtocol}=="00"
      ATTRS{modalias}=="usb:v067Bp2303d0300dc00dsc00dp00icFFisc00ip00"
      ATTRS{supports_autosuspend}=="1"
  
    looking at parent device '/devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4.4':
      KERNELS=="1-4.4"
      SUBSYSTEMS=="usb"
      DRIVERS=="usb"
      ATTRS{configuration}==""
      ATTRS{bNumInterfaces}==" 1"
      ATTRS{bConfigurationValue}=="1"
      ATTRS{bmAttributes}=="80"
      ATTRS{bMaxPower}=="100mA"
      ATTRS{urbnum}=="20"
      ATTRS{idVendor}=="067b"
      ATTRS{idProduct}=="2303"
      ATTRS{bcdDevice}=="0300"
      ATTRS{bDeviceClass}=="00"
      ATTRS{bDeviceSubClass}=="00"
      ATTRS{bDeviceProtocol}=="00"
      ATTRS{bNumConfigurations}=="1"
      ATTRS{bMaxPacketSize0}=="64"
      ATTRS{speed}=="12"
      ATTRS{busnum}=="1"
      ATTRS{devnum}=="7"
      ATTRS{devpath}=="4.4"
      ATTRS{version}==" 1.10"
      ATTRS{maxchild}=="0"
      ATTRS{quirks}=="0x0"
      ATTRS{avoid_reset_quirk}=="0"
      ATTRS{authorized}=="1"
      ATTRS{manufacturer}=="Prolific Technology Inc."
      ATTRS{product}=="USB 2.0 To COM Device"
  
    looking at parent device '/devices/pci0000:00/0000:00:1a.7/usb1/1-4':
      KERNELS=="1-4"
      SUBSYSTEMS=="usb"
      DRIVERS=="usb"
      ATTRS{configuration}==""
      ATTRS{bNumInterfaces}==" 1"
      ATTRS{bConfigurationValue}=="1"
      ATTRS{bmAttributes}=="e0"
      ATTRS{bMaxPower}=="100mA"
      ATTRS{urbnum}=="81"
      ATTRS{idVendor}=="05e3"
      ATTRS{idProduct}=="0608"
      ATTRS{bcdDevice}=="0702"
      ATTRS{bDeviceClass}=="09"
      ATTRS{bDeviceSubClass}=="00"
      ATTRS{bDeviceProtocol}=="01"
      ATTRS{bNumConfigurations}=="1"
      ATTRS{bMaxPacketSize0}=="64"
      ATTRS{speed}=="480"
      ATTRS{busnum}=="1"
      ATTRS{devnum}=="3"
      ATTRS{devpath}=="4"
      ATTRS{version}==" 2.00"
      ATTRS{maxchild}=="4"
      ATTRS{quirks}=="0x0"
      ATTRS{avoid_reset_quirk}=="0"
      ATTRS{authorized}=="1"
      ATTRS{product}=="USB2.0 Hub"
  
    looking at parent device '/devices/pci0000:00/0000:00:1a.7/usb1':
      KERNELS=="usb1"
      SUBSYSTEMS=="usb"
      DRIVERS=="usb"
      ATTRS{configuration}==""
      ATTRS{bNumInterfaces}==" 1"
      ATTRS{bConfigurationValue}=="1"
      ATTRS{bmAttributes}=="e0"
      ATTRS{bMaxPower}=="  0mA"
      ATTRS{urbnum}=="105"
      ATTRS{idVendor}=="1d6b"
      ATTRS{idProduct}=="0002"
      ATTRS{bcdDevice}=="0206"
      ATTRS{bDeviceClass}=="09"
      ATTRS{bDeviceSubClass}=="00"
      ATTRS{bDeviceProtocol}=="00"
      ATTRS{bNumConfigurations}=="1"
      ATTRS{bMaxPacketSize0}=="64"
      ATTRS{speed}=="480"
      ATTRS{busnum}=="1"
      ATTRS{devnum}=="1"
      ATTRS{devpath}=="0"
      ATTRS{version}==" 2.00"
      ATTRS{maxchild}=="6"
      ATTRS{quirks}=="0x0"
      ATTRS{avoid_reset_quirk}=="0"
      ATTRS{authorized}=="1"
      ATTRS{manufacturer}=="Linux 2.6.36-020636-generic ehci_hcd"
      ATTRS{product}=="EHCI Host Controller"
      ATTRS{serial}=="0000:00:1a.7"
      ATTRS{authorized_default}=="1"
  
    looking at parent device '/devices/pci0000:00/0000:00:1a.7':
      KERNELS=="0000:00:1a.7"
      SUBSYSTEMS=="pci"
      DRIVERS=="ehci_hcd"
      ATTRS{vendor}=="0x8086"
      ATTRS{device}=="0x3a3c"
      ATTRS{subsystem_vendor}=="0x1458"
      ATTRS{subsystem_device}=="0x5006"
      ATTRS{class}=="0x0c0320"
      ATTRS{irq}=="18"
      ATTRS{local_cpus}=="ff"
      ATTRS{local_cpulist}=="0-7"
      ATTRS{modalias}=="pci:v00008086d00003A3Csv00001458sd00005006bc0Csc03i20"
      ATTRS{dma_mask_bits}=="32"
      ATTRS{consistent_dma_mask_bits}=="32"
      ATTRS{broken_parity_status}=="0"
      ATTRS{msi_bus}==""
      ATTRS{companion}==""
  
    looking at parent device '/devices/pci0000:00':
      KERNELS=="pci0000:00"
      SUBSYSTEMS==""
      DRIVERS==""
  
  martin@martin:~$ 

• Pridej si do udev pravidlo (staci tam dat jen ty veci, podle kterych je mozne jednoznacne identifikovat dane zarizeni):

  martin@martin:~$ cat /etc/udev/rules.d/99-tty.rules 
  
  SUBSYSTEM=="tty", ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303", ATTRS{manufacturer}=="Prolific Technology Inc.", SYMLINK+="mujSeriovyPort"
  
  martin@martin:~$ 
  
  

  (ty informace dostanes z udevadm)
• restartuj udev /etc/init.d/udev restart
• strc do USB to zarizeni
• jestli jsi mel stesti, budes mit /dev/mujSeriovyPort => raduj se nad vysledkem