I've never looked at it in depth but FTDI has a USB host controller called Viniculum which has UART, SPI & parallel interfaces. It may give you a way to do what you want.They have some sample applications interfacing PICs to USB slave devices. Unfortunately they are in C but they do show that what you want to do is possible with their chip. The chip is about $10 or for about $20 you can get an eval board.




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