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USB basic question in HID class

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embpic

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I got some problem while studying HID class of USB comm.
a.what is report in HID class of USB comm.
b.what is ping pong buffer in PIC18f4550? is it kinda buffer just to hold data for processing?
c.for HID class which transfer is used that is whether control transfer or interrupt transfer?
 

a. see HID device class definition clause 5.6 Reports
b. PIC18F4550 datasheet clause 17.4.4 PING-PONG BUFFERING
c. clause 4.4 Interfaces
 

which document you are talking about plz upload if you have.
 

FvM says refer to the PIC184550 Datasheet and the topics listed there.
and USB Specification Sheet.
https://www.usb.org/developers/docs/

Apart from that to get knowledge you can also use Jan Axelson Book USB Complete
 
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