USB Functions

• TAP_Usb_Read?
• TAP_Usb_Write?
• TAP_Usb_PacketRead?
• TAP_Usb_PacketWrite?
• TAP_Usb_Cancel?

Note that USB functions are rather broken. They crash remarkably quickly when more than one TAP is running. This thread http://www.topfield-australia.com.au/frm/topic.asp?TOPIC_ID=4347 suggests that USB functions may have worked better on an older firmware/API/toolchain.