Objective Development Forums

Hi, I'm researching around on the best way to add a the ability to transfer small amounts of data (~32K) from an EEPROM on a USB game pad. I was hoping there might be an easy way to do this with pure USB HID so I won't have to do a composite device or write a custom driver.

Anybody have any useful information on how to do this? For example what descriptors I might need?

Thanks in advance.

I too am interested in this. I was thinking of trying to implement this
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but figure there could be a more elegant way. However I have not yet started researching it much. If you do find a way please do report back, if no others here have a thought.

I was debating a composite device with USB mass storage as one of the sub devices. The big problems there are complexity, need a whole other set of descriptors and to implement an appropriate interface. Also there is the bulk transfer issue with V-USB.

The option I was leaning towards was HID raw - see http://www.pjrc.com/teensy/rawhid.html while this example is for a Teensy (AVR with hardware USB), it is my belief that simply adding the descriptors and some basic code should make this work with any HID capable device.

Sorry to dig this up but, any luck with this?