so figured most of it out (I think) but the device does not enumerate so I'm missing something.
I swapped theses guys out
// #define USE_FLASH_DESCRIPTORS
const USB_Descriptor_Device_t PROGMEM DeviceDescriptor
USB_Descriptor_Device_t DeviceDescriptor and defined it in the h file.
and that allows this
DeviceDescriptor.ProductID = 0x16D0 ;
but it does not enumerate.
That's correct; you need to enable USE_RAM_DESCRIPTORS, as well
as remove the `const` and `PROGMEM` qualifiers on all the
descriptors (if you want to retain some of them in Flash, you can
undefine all the `USE_*_DESCRIPTORS` options and instead indicate
the memory space in the `CALLBACK_USB_GetDescriptor` descriptor
callback via the additional output parameter that will be enabled.
The last step for using all-RAM descriptors, which I think you may have missed, is to remove the `pgm_read_byte()` calls inside `CALLBACK_USB_GetDescriptor`. Currently it will still be trying to read the descriptor length from flash, rather than RAM. Just replace the `pgm_read_byte(&SomeDescriptor.Header.Size);` instances with plain `SomeDescriptor.Header.Size;`.
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