Hi Jimmy, this function fails, because device_framework_full_speed has no interface description. It seems ux_dcd_initialize() should be called, it initializes DMA transfer. Due to evaluation license restrictions all X-Ware source code is encrypted and cannot be viewed. If you would like to provide your own USB commands without device class, then consider writing your application without generated code. You can use all USBX API directly in your software. X-Ware documentation can be found on Synergy Gallery ( https://synergygallery.renesas.com/media/products/1/156/en-US/Synergy_X-Ware_Docs.zip ). Regards, adboc
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