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TWR-K64 USB Demo Problem

Question asked by Lei Peng on Nov 8, 2017
Latest reply on Nov 9, 2017 by Lei Peng


I have a TWR-K64 board and going to do usb test. I am trying to use the demo project "usb_examples-usb_device_cdc_vcom", but I don't know how to set the jumpers. There is a readme.pdf in usb_examples-usb_device_cdc_vcom->bm. I read it and got confused. Please look at the captured picture below. It says, J29 3-4, Remove all jumpers from J19. I did so, but there is no power supply any more on the board. I am wondering, how the internal regulator will output without an input? 

Also, 2. Connect the target board to the external power source (the example is self-powered).  Dose it mean the TWR-K64 needs an external power supply, say from tower boards? If so, could you please tell me how to set the jumpers to make this usb self-powered to get an external power source? Thank you very much!