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Thread: USB GNSS device never gets attached

  1. #1
    Join Date
    Jan 2022
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    Exclamation USB GNSS device never gets attached

    I insert my GNSS device via USB in hopes of getting a device path to read serially from it:
    I do this using my raspberry Pi 4 that I intend to use as a rtk ntrip caster.

    lusb gives:
    ```
    Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 001 Device 004: ID 1546:01a9 U-Blox AG u-blox GNSS receiver
    Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    ```


    dmesg gives:
    ```
    [ 175.728623] usb 1-1.1: new full-speed USB device number 3 using xhci_hcd
    [ 175.833153] usb 1-1.1: New USB device found, idVendor=1546, idProduct=01a9, bcdDevice= 1.00
    [ 175.833183] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
    [ 175.833196] usb 1-1.1: Product: u-blox GNSS receiver
    [ 175.833206] usb 1-1.1: Manufacturer: u-blox AG - www.u-blox.com
    [ 414.271561] usb 1-1.1: USB disconnect, device number 3
    [ 417.902463] usb 1-1.3: new full-speed USB device number 4 using xhci_hcd
    [ 418.006723] usb 1-1.3: New USB device found, idVendor=1546, idProduct=01a9, bcdDevice= 1.00
    [ 418.006752] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
    [ 418.006764] usb 1-1.3: Product: u-blox GNSS receiver
    [ 418.006775] usb 1-1.3: Manufacturer: u-blox AG - www.u-blox.com
    ```
    After plugging it in twice in different ports. I never seem to get a attach point like /dev/ttyS0 such that I can use the port.
    What is going on here? It is supposed to be just a serial communication port to my knowledge, but perhaps not?.

    Edit:

    I think the reason for not having it work is the ubuntu OS I am running does not have a cdc-acm driver (.ko).
    I have found one for the raspberry pi under the raspberry pi / linux git. But I am not sure how to install it still. Help very much appriciated
    Last edited by kevsterkingen; January 12th, 2022 at 04:53 PM.

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