Hi,
thanks for your extensive help!
If I type stty -F /dev/ttyACM0 1200
then udevadm outputs:
KERNEL[20012.111931] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0/tty/ttyACM0 (tty)
KERNEL[20012.112021] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0 (usb)
KERNEL[20012.112118] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.1 (usb)
UDEV [20012.112896] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.1 (usb)
UDEV [20012.113020] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0/tty/ttyACM0 (tty)
UDEV [20012.113649] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0 (usb)
KERNEL[20012.124307] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/input/input34/mouse2 (input)
UDEV [20012.125135] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/input/input34/mouse2 (input)
KERNEL[20012.128342] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/input/input34/event14 (input)
UDEV [20012.129118] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/input/input34/event14 (input)
KERNEL[20012.132240] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/input/input34 (input)
KERNEL[20012.132356] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/0003:2341:003E.0017/hidraw/hidraw2 (hidraw)
KERNEL[20012.132414] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/0003:2341:003E.0017 (hid)
KERNEL[20012.132446] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2 (usb)
KERNEL[20012.132943] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4 (usb)
UDEV [20012.133242] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/input/input34 (input)
UDEV [20012.133295] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/0003:2341:003E.0017/hidraw/hidraw2 (hidraw)
UDEV [20012.133866] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2/0003:2341:003E.0017 (hid)
UDEV [20012.134354] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.2 (usb)
UDEV [20012.135009] remove /devices/pci0000:00/0000:00:14.0/usb3/3-4 (usb)
KERNEL[20012.485016] add /devices/pci0000:00/0000:00:14.0/usb3/3-4 (usb)
KERNEL[20012.485430] add /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0 (usb)
KERNEL[20012.485738] add /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0/tty/ttyACM0 (tty)
KERNEL[20012.485779] add /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.1 (usb)
UDEV [20012.488233] add /devices/pci0000:00/0000:00:14.0/usb3/3-4 (usb)
UDEV [20012.489582] add /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.1 (usb)
UDEV [20012.489651] add /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0 (usb)
UDEV [20012.493646] add /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0/tty/ttyACM0 (tty)
So this looks good, but If I try to open the port I get the following:
$ picocom -b 9600 -p n -d 8 /dev/ttyACM0
picocom v1.7
port is : /dev/ttyACM0
flowcontrol : none
baudrate is : 9600
parity is : none
databits are : 8
escape is : C-a
local echo is : no
noinit is : no
noreset is : no
nolock is : no
send_cmd is : sz -vv
receive_cmd is : rz -vv
imap is :
omap is :
emap is : crcrlf,delbs,
FATAL: cannot open /dev/ttyACM0: Device or resource busy
One time it worked, but mostly not. I do not know why he thinks the resource is busy?