NanoPi NEO3 with DietPi Can I use a LCD2USB?

[niighthawk]

Hi, I have a NanoPi NEO3 running DietPi, and according to the Neo3 wiki, I should be able to use an LCD2USB with my NanoPi. I’d love to display my LAN IP and other useful information on it. The screen also comes with two buttons.

I followed the steps in chapter 5 of this LCD2USB GUIDE and installed LCD4linux. When plugged in, I can see “LCD2USB V1.09” displayed on my LCD screen.

However, at this step, the command doesn’t work, and here’s the error I get:

I also added the lines to my config file, but I don’t have a usbdev3.2 port. My knowledge is limited, so I’m stuck at the port section. On my Neo, I can see the LCD2USB connected to BUS 2 DEVICE 4, but I’m unsure what port this corresponds to or how to work around this.

Also I do not have any ttyUSB folder…

[niighthawk]

According to the usb id database ( http://www.linux-usb.org/usb.ids ) My device is listed.

[niighthawk]

Nobody ?

[Jappe]

What about /dev/bus/usb/ ?

[niighthawk]

@Jappe yes I do have something

I set the link but nothing seem to work

[Jappe]

Ok so my hint was wrong, the display gets possibly detected as a serial device. Can you check what else you have in /dev when the display is connected? Maybe something like /dev/ttyUSB or /dev/hidraw?!

If in doubt, disconnect the display, reconnect and run dmesg | grep -i usb

[niighthawk]

This is what I have in /dev ( no hidraw and no ttyUSB )

If i disconnect the display and reconnect it and run dmesg | grep -i usb this is what I have

root@SSEW:~# dmesg | grep -i usb
[    0.000000] Kernel command line: root=UUID=bff9809f-ede5-4e04-9ff6-9e83c56d488c rootfstype=ext4 rootwait  consoleblank=0 coherent_pool=2M usb-storage.quirks= net.ifnames=0 cgroup_enable=memory swapaccount=1
[    0.727172] usbcore: registered new interface driver usbfs
[    0.727278] usbcore: registered new interface driver hub
[    0.727387] usbcore: registered new device driver usb
[    1.031944] dwc2 ff580000.usb: supply vusb_d not found, using dummy regulator
[    1.032925] dwc2 ff580000.usb: supply vusb_a not found, using dummy regulator
[    1.166701] dwc2 ff580000.usb: EPs: 10, dedicated fifos, 972 entries in SPRAM
[    1.167905] dwc2 ff580000.usb: DWC OTG Controller
[    1.168462] dwc2 ff580000.usb: new USB bus registered, assigned bus number 1
[    1.169223] dwc2 ff580000.usb: irq 29, io mem 0xff580000
[    1.170333] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
[    1.171165] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.171849] usb usb1: Product: DWC OTG Controller
[    1.172302] usb usb1: Manufacturer: Linux 6.6.56-current-rockchip64 dwc2_hsotg
[    1.172976] usb usb1: SerialNumber: ff580000.usb
[    1.174882] hub 1-0:1.0: USB hub found
[    1.181418] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2
[    1.182500] ehci-platform ff5c0000.usb: EHCI Host Controller
[    1.182524] ohci-platform ff5d0000.usb: Generic Platform OHCI controller
[    1.182587] ohci-platform ff5d0000.usb: new USB bus registered, assigned bus number 3
[    1.183087] ehci-platform ff5c0000.usb: new USB bus registered, assigned bus number 4
[    1.183345] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 5
[    1.183385] xhci-hcd xhci-hcd.0.auto: Host supports USB 3.0 SuperSpeed
[    1.183884] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
[    1.183902] ohci-platform ff5d0000.usb: irq 31, io mem 0xff5d0000
[    1.184657] ehci-platform ff5c0000.usb: irq 30, io mem 0xff5c0000
[    1.185244] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.190979] usb usb2: Product: xHCI Host Controller
[    1.191448] usb usb2: Manufacturer: Linux 6.6.56-current-rockchip64 xhci-hcd
[    1.192094] usb usb2: SerialNumber: xhci-hcd.0.auto
[    1.194208] hub 2-0:1.0: USB hub found
[    1.196213] usb usb5: We don't know the algorithms for LPM for this host, disabling LPM.
[    1.197565] usb usb5: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 6.06
[    1.198476] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.198542] ehci-platform ff5c0000.usb: USB 2.0 started, EHCI 1.00
[    1.199135] usb usb5: Product: xHCI Host Controller
[    1.200179] usb usb5: Manufacturer: Linux 6.6.56-current-rockchip64 xhci-hcd
[    1.200836] usb usb5: SerialNumber: xhci-hcd.0.auto
[    1.202943] hub 5-0:1.0: USB hub found
[    1.204968] usbcore: registered new interface driver usb-storage
[    1.205263] usb usb4: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
[    1.206351] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.207137] usb usb4: Product: EHCI Host Controller
[    1.207611] usb usb4: Manufacturer: Linux 6.6.56-current-rockchip64 ehci_hcd
[    1.208266] usb usb4: SerialNumber: ff5c0000.usb
[    1.209961] hub 4-0:1.0: USB hub found
[    1.247096] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 6.06
[    1.247918] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.248614] usb usb3: Product: Generic Platform OHCI controller
[    1.249194] usb usb3: Manufacturer: Linux 6.6.56-current-rockchip64 ohci_hcd
[    1.249864] usb usb3: SerialNumber: ff5d0000.usb
[    1.251608] hub 3-0:1.0: USB hub found
[    1.293305] usbcore: registered new interface driver usbhid
[    1.293847] usbhid: USB HID core driver
[    1.458660] usb 2-1: new full-speed USB device number 2 using xhci-hcd
[    1.609160] usb 2-1: New USB device found, idVendor=0403, idProduct=c630, bcdDevice= 1.09
[    1.609973] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    1.610674] usb 2-1: Product: LCD2USB Interface
[    1.611104] usb 2-1: Manufacturer: Till Harbaum
[ 6894.324868] usb 2-1: USB disconnect, device number 2
[17652.438473] usb 2-1: new full-speed USB device number 3 using xhci-hcd
[17652.588137] usb 2-1: New USB device found, idVendor=0403, idProduct=c630, bcdDevice= 1.09
[17652.588185] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[17652.588210] usb 2-1: Product: LCD2USB Interface
[17652.588231] usb 2-1: Manufacturer: Till Harbaum
[17789.895188] usb 2-1: USB disconnect, device number 3
[17793.830500] usb 2-1: new full-speed USB device number 4 using xhci-hcd
[17793.981633] usb 2-1: New USB device found, idVendor=0403, idProduct=c630, bcdDevice= 1.09
[17793.981681] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[17793.981705] usb 2-1: Product: LCD2USB Interface
[17793.981725] usb 2-1: Manufacturer: Till Harbaum
root@SSEW:~#

[Jappe]

Looks like the system does not know what to do with this device. There is nothing created at /dev.
So idk, looks like the driver is not working? (but it shows the message in the displkay, so it is working?)
Also it’s pretty hard to get any documentation for lcd4linux (which should have build-in lcd2usb support), seems like the project is dead?
https://ssl.bulix.org/projects/lcd4linux/

Edit:
Also look at the date of the friendlyELEC page: July-5-2016. I guess the article is a bit outdated.
And then I look at the example from the unofficial wiki https://wiki.lcd4linux.tk/doku.php/lcd2usb

Display LCD2USB {
    Driver     'LCD2USB'
    Bus        '003'
    Device     '004'
    Contrast   250
    Brightness 200
    Icons      1
}

There is no port specification at all. ChatGPT () also says, there is no port created, its a HID interface and should work directly via the driver.
So everything is a bit unclear. MAybe don’t stick to the outdated friendlyELEC instructions.

[niighthawk]

the last bit of code you post, where I should put it ?

[Jappe]

Into your lcd4linux.conf, but you need to change the bus and device according to the output of lsusb

[niighthawk]

I don’t think it’s working either, so I think I’ll let it go. Thanks for your help, Jappe!