MATLAB无法连接COM6端口求助：FPGA加速度计数据实时绘图报错

架构老林

2026-5-28

Troubleshooting COM6 Connection Failure in MATLAB for FPGA Accelerometer Data

Hey there, let's work through this serial port issue together—since Tera Term can access the port fine, we know the hardware and basic setup are good, so let's focus on the conflicts or misconfigurations that might block MATLAB:

Close Tera Term first (this is the most likely fix!)
Serial ports can only be used by one application at a time. Since Tera Term is already connected to COM6 to print your accelerometer data, MATLAB can't grab the port until Tera Term is fully closed. Shut down Tera Term completely, then re-run your MATLAB script.
Double-check your MATLAB serial port settings
Even if you only changed variable names, confirm that your code is targeting the exact same port (COM6) and using identical serial parameters as Tera Term:
- Baud rate
- Data bits
- Stop bits
- Parity
  Mismatched settings can sometimes trigger connection failures, even if the port itself is available. You can copy these values directly from Tera Term's serial configuration menu.
Verify COM6 exists in Windows Device Manager
Open Device Manager, expand the "Ports (COM & LPT)" section, and make sure COM6 is listed. USB-serial devices sometimes change port numbers after a reboot or reconnection—if Tera Term is now using a different port, update your MATLAB code to match that port name.
Run MATLAB as Administrator
On some Windows systems, regular user accounts don't have permission to access serial ports. Right-click the MATLAB shortcut, select "Run as administrator", then try your script again.
Reinstall your serial driver
If all else fails, there might be a glitch in the USB-serial driver for your FPGA/accelerometer setup. Uninstall the driver from Device Manager, disconnect and reconnect your hardware, then let Windows reinstall the driver automatically.