@ -37,6 +37,18 @@
# include "Descriptors.h"
/* On some devices, there is a factory set internal serial number which can be automatically sent to the host as
* the device ' s serial number when the Device Descriptor ' s . SerialNumStrIndex entry is set to USE_INTERNAL_SERIAL .
* This allows the host to track a device across insertions on different ports , allowing them to retain allocated
* resources like COM port numbers and drivers . On demos using this feature , give a warning on unsupported devices
* so that the user can supply their own serial number descriptor instead or remove the USE_INTERNAL_SERIAL value
* from the Device Descriptor ( forcing the host to generate a serial number for each device from the VID , PID and
* port location ) .
*/
# if (USE_INTERNAL_SERIAL == NO_DESCRIPTOR)
# warning USE_INTERNAL_SERIAL is not available on this AVR - please manually construct a device serial descriptor.
# endif
/** Device descriptor structure. This descriptor, located in FLASH memory, describes the overall
* device characteristics , including the supported USB version , control endpoint size and the
* number of device configurations . The descriptor is read out by the USB host when the enumeration