Hi, All:

This is USB problem. I try to find some answers on puzzle I have met.

Can I send data back and forth as BULK transfer between control endpoint and Host Controller? I tested it, it works. But one programmer in our company said: between control Endpoints, we must use Control Transfer, we can't use Bulk Transfer(only data packet), data can be received correctly, but it is NOT correct. I think he means that we can't do it, because it is not mentioned in USB spec. I am wondering: why I can't do BULK transfer between COntrol Endpoints? Only difference is there is no SETUP token in the BULK transfer?

Description above is clear enough?

Thanks.

Frank