| 1 |
Is there any logic to the order in which usb-serial devices are |
| 2 |
enumerated when a system starts? |
| 3 |
|
| 4 |
When using multiple usb-serial devices, the program(s) have to know to |
| 5 |
which port each particular external device is connected. When |
| 6 |
initially connecting, the first to be plugged in will be /dev/ttyUSB0 |
| 7 |
and so on. Having connected them all, looking at the output of |
| 8 |
udevinfo, I can see the bus address to which each port is connected |
| 9 |
and can create udev rules to create aliases to 'fixed' names which the |
| 10 |
programs can reference. However when the system was restarted, the |
| 11 |
mappings were wrong and the bus addresses for some of the ports were |
| 12 |
swapped. I expected the /dev/ttyUSBx names to change, that is why I |
| 13 |
tried mapping to the bus ID (eg 1-4.1:1.0). |
| 14 |
|
| 15 |
Is there any way to write udev rules which will map the usb-serial |
| 16 |
device connected to a particular socket on either the PC or a hub to a |
| 17 |
known name? So that if the usb connector is removed and replaced (in |
| 18 |
the same socket) or the system is rebooted that programs will be able |
| 19 |
to open the correct device connected to each usb serial adaptor? |
| 20 |
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| 21 |
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