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DLPC7540: How to control DPLC 7541 by usb on embedded linux system

Part Number: DLPC7540

Hi,

  I can not control DPLC 7541 with usb on embedded linux system. I get VID and PID of DPLC 7541, but can not read and write register of DPLC 7541.

  How to control DPLC 7541 by usb on embedded linux system?