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STM32F746G-Discovery, USB-HS MSC example, after power-off and on, the firmware doesn't work.

Question asked by chun.dan on Jul 4, 2016
Latest reply on Jul 5, 2016 by chun.dan
Test Environment
STM32F746G-Discovery
MDK-ARM, uvision V5.14.0.0 (Licenced)
USB High-Speed, Mass Storage Class Example
   ( ST_STM32F\STM32Cube7\STM32Cube_FW_F7_V1.4.0\Projects\STM32746G-Discovery\Applications\USB_Device\MSC_Standalone\MDK-ARM )


1. Compilation works okay with MDK-ARM. 
2. Board is powered by 5V_LINK (CN14) and USB-HS is connected via CN12.
2. Pressing 'Download' button works okay. 
    2-1. PC recognizes 'removable disc'

3. Test I.
    3-1. dis-connect USB-HS (CN12)     : 'removable disc' disappears
    3-2. and re-connect                     : PC recognizes it as 'removable disc'

    3-3. pressing reset button : during pressing, 'removable disc' disappears
    3-4. Releasing reset button   : PC recognizes it as 'removable disc'

4. Test II. 
    4-1. Disconnect power (CN14)
    4-2. Re-connect power   :  'removable disc' is not recognized any more. 
    4-3. Reset button          :  no change. 

5. I change the compile option to USE_USB_FS
    5-1.  Item 3 (Test I) and Item 4 (Test II) works okay. 


From the tests, I suspect 
    - USB HS MSC example code has initialization error, so it doesn't work with power-up. 
    

Can you test the Cube_FW_F7_V1.4.0 USB HS MSC example on your STM32F746G discovery and share the result ?

Thanks, 
Best Regards, 
Danny
    

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