/dev/ttyACM0 not created on ubuntu 20.04

[MatthiasBiel]

Hi, when I set an LPC1837 into programming mode, I can see it via lsusb:

matthias@i9:/lib/udev/rules.d$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 045e:07a5 Microsoft Corp. Wireless Receiver 1461C
Bus 001 Device 007: ID 1fc9:000c NXP Semiconductors LPC
Bus 001 Device 004: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

But the /dev/ttyACM0 device, which is required for LPCScrypt to program the µC, is not created. 
I'm sure that someone else already solved this problem, please post your solution!

Thank you in advance,
Matthias 

[MatthiasBiel]

So just another case of RTFM Thank you for putting me on the right track!

[converse · Accepted solution]

The tty device is not created until you have loaded the LPCScrypt software into the device. It is initially enumerated as a DFU device, which LPCScrypt uses to load its firmware.

So, what you are seeing is normal. Just run LPCScrypt.