7 years, 4 months ago.

No USB Serial Port

I have just added a new LPC11U24 mbed module. When plugged in it shows up as a mbed drive in device manager. Tried both Win XT and Win 7 with the same result. Also no 'unknown devices' shown.

Any ideas? John

3 Answers

John Harris
7 years, 4 months ago.

Thanks Igor. I was pointed at the old 'Serial.inf' Now I have a port, but also an error message ' pinmap not found.....' John

Accepted Answer

That means you got a pin assignmen error in your code. For example if you use an SPI object on pins that don't support SPI. Or for example mixing up TX and RX.

posted by Erik - 03 Mar 2013
7 years, 4 months ago.

You need to install the driver. Please follow the instructions on this page:


7 years, 2 months ago.

Hi, my PC do not accept the inf-file anymore. in my first try it worked and the device mangager shew me the serial usb port. but after rebooting it do not work anymore. whats wrong??