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Compiler/TMS320F28377D: A problem with 28377"usb_flash_programmer"

Part Number: TMS320F28377D


Tool/software: TI C/C++ Compiler

Dear sir:

       I  download the example of 28377"usb_flash_programmer",and run it. Put the usb interface to the computer,it show  "Unknown Device" under "USB controller" .

 When I tried to update driver and browsed to the Windows driver folder which contains "F28x7x_USB_Boot_Loader.inf", it simply returned with "The best driver software for your device is already installed", and still

shows as "Unknown device".  I tried several times, but always the same. 

   My PC is 64bit WIN7 system, and I tried in 32 bit WIN7, also in Win xp system. Unfortunately,all invalid.