Mbed serial port is not recognized correctly

Hello, I am contacting you to ask for your help.

mbed serial port is not recognized correctly. If you have any idea what could be the cause, please advise.

Here are the steps:

  1. Connect mbed to PC
    *mbed: LPC1768
    *PC: Windows10 enterprise (LattePanda Boad)
  2. Install “mbedWinSerial_16466.exe”
  3. Check serial port in device manager

If it is normal, mbed will be recognized as “mbed Serial Port (COMxx)”.
However, the following anomaly occurred.
4. “mbed Serial Port (COMxx)” was recognized, but the COM# overlapped with another #, and “!” error (Code: 10) was displayed in Device Manager.
5. Even after changing COM#, the “!” error (Code: 10) was still displayed, so I deleted the driver.
6. After reinstalling, it was newly recognized as “USB Serial Device (COMxx)”.

Is there no problem even if the recognition is not “mbed Serial Port (COMxx)”?
Also, what can be the reason why it is not recognized as mbed?

Has this LPC1768 board had its firmware updated? Some of these boards are still floating around with decade-old interface firmware that’s really buggy. See here for update instructions (+ general info).

Other than that, I haven’t seen anything like this before, no. Are you able to flash a hello world program on the board and have it work?


Thank you for your kind support!

I updated to lasted firmware ver.141212, but unfortunately the problem did not improve.
Then, the LPC1768 board could print hello world, and other communication(get and calculation)

So, it sounds like it’s working, right? If just the name of the serial port is incorrect, I don’t think there’s a real issue. Probably just Windows doing something weird. (the same in Japanese follows)


Only the name of the COM port is strange, and everything else is fine. I got it! Certainly, the operation seems to be fine.
I wonder what is affecting windows…