打开串行端口时USB相机崩溃

Question

I'm writing a program in WPF that needs to connect to a serial port to get and send data to a piece of machinery, and connect to a camera mounted on the machinery to show the video stream.

So last week we bought a mini PC (a beelink bt3 pro) to give to our customers when they bought this machinery, so they could install our program on this dedicated pc. We immediately noticed that on the program startup, the camera would crash with that notorious sound that windows makes when you disconnect an usb device. So after searching for clues on the problem I found out that when I called serialport.Open(), the camera would crash. For the serial port I use the standard Microsoft library, while for the camera I first used Directshow, then EMGUCV (I switched last week because i tought that the problem was caused by the camera library).

This is the code I use in the test program:

VideoCapture c = new VideoCapture(0);
c.ImageGrabbed += c_ImageGrabbed;
c.Start();
SerialPort port = new SerialPort("COM5", 9600, Parity.None, 8, StopBits.None); 
port.Open();

Just after calling Open(), the camera crashes and stops recording, making the windows error sound like it was removed from the PC. No Exceptions are thrown out, and the program keeps running.

It is important to notice that this problem happens only on this PC, and I have the doubt that Windows 10 was not installed correctly, as I found a Windows.old folder in C:, and the system prompts me sometimes to delete the old windows folder.

Answer 1

If the camera is powered over USB, it is probably a power problem, ie the USB port on the computer does not deliver enough current for a stable operation of the camera.

You may try

• to connect the camara to a USB port with higher current specification
• to connect the camera over an externally powered USB Hub.