Ubuntu – No ttyACM0 for Arduino Nano on Ubuntu. How to attach it

arduinoarmmodprobeserial portusb

On my Firefly-RK3399 (arm arch) I have installed their official ubuntu image for the board. I also installed Arduino IDE and when I connect my Arduino UNO then all fine, I can flash it and I see in my serialports (Arduino IDE):

/dev/ttyACM0

However, when I do this with the Arduino Nano…nothing. Arduino IDE does not see it and I can not flash it.

I already saw a lot of forum posts today. I tried all out but unfortunately nothing worked for me so far.

When I run:

dmesg -w

then I plug in Arduino UNO, then Arduino NANO…then I get the following at the end of the console:

[ 1915.205439] usb 1-1.4: new full-speed USB device number 8 using
ehci-platform [ 1915.294646] usb 1-1.4: New USB device found,
idVendor=2341, idProduct=0043 [ 1915.294663] usb 1-1.4: New USB device
strings: Mfr=1, Product=2, SerialNumber=220 [ 1915.294671] usb 1-1.4:
Manufacturer: Arduino (www.arduino.cc) [ 1915.294678] usb 1-1.4:
SerialNumber: 85435333131351104190 [ 1915.296502] cdc_acm 1-1.4:1.0:
ttyACM0: USB ACM device

[ 1934.279563] usb 3-1: new full-speed USB device number 2 using
xhci-hcd [ 1934.393985] usb 3-1: New USB device found, idVendor=1a86,
idProduct=7523 [ 1934.394001] usb 3-1: New USB device strings: Mfr=0,
Product=2, SerialNumber=0 [ 1934.394009] usb 3-1: Product:
USB2.0-Serial

So the Arduino Nano does not get attached to any ttyACM*

How can I do this?

Best Answer

I was able to find the Nano with the CH340 chip (or CH340G, the Amazon item wasn't clear) on Ubuntu 18.04 just by installing the Arduino IDE (1.8.x) and giving myself permissions to the port with:

sudo usermod -a -G dialout <my linux username>

Then I was able to see the /dev/ttyUSB0 port in the Arduino IDE (it isn't ttyACM0 like in the documentation). You can find out what port it is by unplugging your Nano, then running:

ls -l /dev/tty*

Then plug your Nano back in and run it again and compare the list. The new device should be at the bottom of the second list.
I was able to upload a sketch by changing the processor from ATmega328p to the Old Bootloader.

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Ubuntu – (re) mount usb device

Figure out its uuid:

(At least once, under whatever circumstances, if nothing helps, by mounting it on a friends machine). First, let's get the current id. (that can change again, on another time)

mount | grep ^/dev

You should somewhere should recognize its actual name here,

/dev/sda4...
/dev/sda5 on /boot ...
/dev/sdc1 on /media/frank/iPhoneWhatsoever...
/dev/sdc2 on /media/frank/my BackupDrive...

Now, say, it's sdb1. Let's figure out its truly unique uuid:

$> ll /dev/disk/by-uuid/ | grep sdc1

Should get you a fairly long string (often hex, sometimes with dashes)

lrwxrwxrwx [...]  366A2F886A2F003A -> ../../sdc1

manual mount

directory must pre-exist, not taken care of. so generate it (only once, ever):

sudo mkdir /media/myFx

And here we go

mount /dev/disk/by-uuid/366A2F886A2F003A /media/myFX

manual unmount

sudo umount /dev/disk/by-uuid/366A2F886A2F003A

Additionally if not done yet, add it to /etc/fstab. For that or for mount command (see man pages) you might want to use additional parameters, if there are problems with your preferred user rights, a ‘rare’ drive format etc... Just as a sketch:

sudo mount -t ntfs -o umask=007,gid=046,uid=0,nls=utf8 /dev/disk/by-uuid/366A2F886A2F003A /media/myFX

Ubuntu – USB ports keep resetting on Linux

A possible solution - Blacklisting USB related kernel modules in a trial and error procedure revealed that the ehci-pci kernel module was the cause of the problem.

For a temporary solution, simply remove the kernel module:

sudo rmmod ehci_pci

For a permanent solution, either blacklist the module via kernel boot arguments, e.g.

modprobe.blacklist=ehci_pci

nb. Blacklisting ehci_pci will also prevent kernel module ehci-hcd from getting loaded.

The ehci* kernel modules are the kernel’s USB 2 drivers.

Luckily, the USB 3 kernel modules xhci* support USB 2 devices as well and you will experience no performance loss with these

Best Answer

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