Re: usb_control_msg works in linux but not windows

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)

Regards,
Travis

On 2/19/2014 4:23 PM, Rob Willard wrote:
> Good day...
>
> We are writing some proof of concept software to ensure a new USB device
> will be usable in both Linux and Windows.
>
> The following line turns on an LED.
>
>       int t2 = usb_control_msg(handle, 0x01, 10, on   , 0, 0, 0, 10);
>
> and works just fine in Linux, however produces the following error in
> Windows:
>
>       libusb0-dll:err [control_msg] sending control message failed, win
> error: The parameter is incorrect.
>
> I am very new to USB, and have not been able to find any kind of
> reference as to why it would work on one side, but not the other... Any
> help would be most appreciated.
>
> Rob
>
>
>
>
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