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i am using MCBSTR9& MCB2300 development board. it is getting powered by the PC , but these devices is not recognized by the computer(i.e. the usb device is not recognised). The Keil Ulink 2 is recognized by the pc, since its driver is installed along with the keil IDE. help us I downloaded the sample usb programs in the keil , but usb is not working
There may be many reasons.
First, can you confirm that the hardware has no problem? If you are very sure that the hardware is OK, then it may be the driver/firmware problem. What do you mean by "the usb device is not recognized"? Do you mean the PC can detect the USB device but the device is not recognized?
Which example program you are using? And what is the PID&VID? Have you ever tried some other example code with different USB implementation but same PID&VID(e.g. You tried one USB HID Example, after that you tried USB MSD example with the same PID&VID)? You can uninstall the usb driver using usbdeview, look for the PID&VID pair you are using, uninstall the driver if you have the driver installed.