We have a project where we have the code to communicate with our two devices, but we need to write the "Glue" to combine them together into a USB composite device. Ideally you should use IAR and have knowledge of Subversion. We will use a Nuvoton NUC220 or NUC240. We cannot use a different micro-controller as it requires 5V IO .
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I have extensive experience in programming OHCI and EHCI drivers using ARM assembly language for a large range of USB devices. Will need sample hardware to allow debugging. Sample code available if required.