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STM32F4 Discovery - merge two USB descriptors

Question asked by ressia.alberto.001 on Oct 16, 2015
Dear all,
I'm using STM32F4 Discovery board and I wrote two separate projects:
       
  • Audio USB Device (that uses Audio class USB descriptor)
  •    
  • General purpose Device (that uses CDC USB descriptor)

How can I merge these two descriptors? I saw the UM0424 Application Note but the section related to the composite device is one page...

Thanks

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