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PROBLEM WITH USB LPC23XX

Hi,

I chargue in my board with LPC2387 microcontroller an hex file that corresponds to the USBCDC project for MSB300 of KEIL.

I tried to follow this procedure:

www.keil.com/.../dev_cdc_tutorial.html

But my computer doesn´t detect my board when I connect the USB interface of the board with an USB cable to one of my PC´s ports.

What can I do? It´s like nothing happens when I connect the USB interface to my computer.

Thank you for your help,

Susana.