Samd21-SDCARD(SPI) And USB Stack Interfacing Problem

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Currently I am working on samd21 (ATSAMD21J18A) Trying to develop a system where we can directly read the sd card using usb stack.>

i have tried so many times but getting the same problem  when i am trying to connect it with the PC :  USB Device not recongnized.>

i have referred all the tutorial and have checked it so many times but failed to detect the problem.>

I have attached my program.>

please help me as soon as possible.>

Thank you.>

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Last Edited: Fri. Nov 10, 2017 - 03:10 PM
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Hey, I am also trying to implement the USB MSC Device + SD Card on the SAMD21.

Where you able to figure out how to implement this or find what was causing the problem?

Thank you