CH340 setup on RPI 4 with Ubuntu 64bit

 CH340 setup on RPI 4 with Ubuntu 64bit 

based on : 

Remove the Brile for the blind - it will mess up work with COM port and CH340.

sudo apt remove -y brltty

(source https://askubuntu.com/questions/1403705/dev-ttyusb0-not-present-in-ubuntu-22-04)

source: https://learn.sparkfun.com/tutorials/how-to-install-ch340-drivers/all

• Download the patched drivers repository and unzip the files
  
  
  GITHUB LINUX PATCHED CH340 DRIVERS
  direct link to the download https://github.com/juliagoda/CH341SER/archive/refs/heads/master.zip

• cd into the directory where the files are saved
• make clean
• make
• sudo make load
• sudo rmmod ch341 to uninstall the broken driver
• lsmod | grep ch34 to list what modules are currently installed
• Plug and unplug your CH340 device again on the USB port
• dmesg
  • Expected output (should show "ch34x" now):

[  xxx] ch34x ttyUSB0: ch34x converter now disconnected from ttyUSB0
[  xxx] ch34x 3-2:1.0: device disconnected

Depending on your root permissions, you may need to configure the serial port with the following two commands. Make sure to adjust the $username with respect to the user ID that is currently logged in.

sudo usermod -a -G dialout $username 
sudo chmod a+rw /dev/ttyUSB0

Heads up! Depending on how the CH340 enumerated on your computer, the /dev/ttyUSB0 may be different. Try using ls command as explained in the Driver Verification if you have issues configuring the serial port settings and adjusting the port as necessary.