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Title: USB Design by Example: A Practical Guide to Building I/O Devices
The Universal Serial Bus (USB) specification is a boon for users in that it makes the process of connecting peripherals to computers effortless, in most cases. As is often the case with user-friendliness, though, the cosmetic ease comes about as a result of behind-the-scenes complexity. USB Design by Example explains what USB means to hardware developers, taking an approach that combines academic elucidation of the official specification with some experimental setups. Though not everything a hardware developer could wish for, John Hyde's explanations represent a valuable supplement to the notably obtuse specification documents.
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If this question is correclty asked it would be hard to do with your PIC. Its fairly easy to interface a PC with a PIC as USB device. But if you would like to interface some other USB device, lets say a USB HD, to your PIC its much more dificult.
To do this you would need some USB host chip and a Host stack to control that chip. Most of the host chips around is based on the 32bit PCI buss and can not be serviced by a simple PIC. Cypress has some host chip that is simplified for 8/16 bit interfaceing, check for example SL811HS or the CY7C67300. There is dev. kits. for them including some host stacks as well.
The second part needed, a host stack, is also much harder to code then the device stack. There are many device example source parts to download from the net but you will not find any host one that works "out of the net". On Time among others has a RTUSB32 stack that can be fairly easy ported but again it is focused on 32bit PCI bus and larger systems with an RTOS.
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