Re: usb_control_msg works in linux but not windows

On Thu, Feb 20, 2014 at 9:39 AM, Travis <[email protected]> wrote:
> Greetings,
>
> You are trying to use a "standard" usb request for what should be a
> vendor request type. IE: the 0x01 in the 2nd param.
>
> For the 2nd param (request type) you need to use something like the
> following to perform an action like that:
> requesttype = USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN
> or
> requesttype = USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT
>
> if you specify USB_ENDPOINT_IN then you are saying you want the "bytes"
> portion to be returned from the device (DEVICE TO HOST)
> if you specify USB_ENDPOINT_OUT then you are saying you want the "bytes"
> portion to be sent to the device (HOST TO DEVICE)
>

Good analysis.

To the OP, if you are new to USB, you may want to go
through the following short introduction to USB.
http://www.usbmadesimple.co.uk/index.html

In particular, the following section talks about some of
the terminology used in the above.
http://www.usbmadesimple.co.uk/ums_4.htm

A bit more in detail
http://msdn.microsoft.com/en-us/library/windows/hardware/ff539261(v=vs.85).aspx

If you want to read more,then the USB 2.0 spec is the best.

-- 
Xiaofan

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