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Etching Brds - USB Prob - Solution Found

Question asked by jlc.jlsilicon on Jul 24, 2012
Latest reply on Jul 26, 2012 by jlc.jlsilicon
                                                               
           
I am building my own stm32f4 boards.  The code runs, but I cant get the USB to be recognized by windows - just Device-Not-Recognized.  But the same code works on my DemoBoard.
            I followed the DemoBoard Schem except for the EMID02USB03F2 chip.

            USB connected as :
            PA9   - UsbVbusP1
            PA11 - /\/\ - UsbDmP2 (res=20R)
            PA12 - /\/\ - UsbDpP3 (res=20R)
            PA10 - UsbIdP4
            GND  - UsbGndP5

            I still do not have the USB working on my own Boards (while it does work on the Demo Board).  And, I followed the Demo Brd Schem explicitly.
            Except that I did not add the EMID02USB03F2 chip.  Is this neccessary ? - It was not suggested in the Specs.

            Anybody have any useful ideas ?
           
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