I’m a self-certified newbie. I was working on the example at https://blog.arduino.cc/2020/06/24/machine-vision-with-low-cost-camera-modules/. Unfortunately, Camera Pattern was not displayed by Processing. I closed Arduino IDE (and Processing window was dismissed thereafter). I rechecked the pin connections and did not discover anything incorrect.
Now when I launch Arduino IDE, Processing is launched too without any manual operation. To make matters worse, Arduino can no longer upload code via /dev/ttyACM0 - the only active serial port on the desktop seems to be permanently enjoined to Processing. Dismissing Processing window, closes Arduino IDE.
How can I stop Processing from being launched (and locking up the serial port) whenever I want to work on Arduino IDE? Thanks for any suggestion.