dynamixel u2d2 not detected on /dev/ttyUSB0

Kevin Jordil

2/14/24, 9:23 PM

I currently have two CM4 on Ubuntu 20.04 and I'm trying to get the U2D2 card to work for dynamixels.

I had succeeded without too much problem on the first CM4 in September but impossible to detect the U2D2 on /dev/ttyUSB0 on the other CM4.

The dmesg of the CM4 which works:

[  186.324077] usb 1-1.4: new high-speed USB device number 3 using dwc2
[  186.429144] usb 1-1.4: New USB device found, idVendor=0403, idProduct=6014, bcdDevice= 9.00[  186.429153] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  186.429161] usb 1-1.4: Product: USB <-> Serial Converter
[  186.429165] usb 1-1.4: Manufacturer: FTDI
[  186.429170] usb 1-1.4: SerialNumber: FT5NY83B
[  186.485778] usbcore: registered new interface driver usbserial_generic
[  186.485810] usbserial: USB Serial support registered for generic
[  186.494547] usbcore: registered new interface driver ftdi_sio
[  186.494591] usbserial: USB Serial support registered for FTDI USB Serial Device
[  186.494684] ftdi_sio 1-1.4:1.0: FTDI USB Serial Device converter detected
[  186.494779] usb 1-1.4: Detected FT232H
[  186.495884] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB0

The dmesg of the CM4 that doesn't work has nothing regarding the USB. After some modprobe (usbserial, ftdi_sio, usbcore), I have this:

[ 2190.944606] usbcore: registered new interface driver usbserial_generic
[ 2190.944640] usbserial: USB Serial support registered for generic
[ 2243.632600] usbcore: registered new interface driver ftdi_sio
[ 2243.632639] usbserial: USB Serial support registered for FTDI USB Serial Device

119

0 + 0

usb

raspberrypi

20.04

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: dynamixel u2d2 not detected on /dev/ttyUSB0

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.