Re: usb_control_msg works in linux but not windows

One more thing,

This request is also invalid for a clear feature request. Clear/set 
feature request are not supposed to pass data in either direction. EG:

VALID:
usb_control_msg(handle, USB_RECIP_INTERFACE | USB_ENDPOINT_OUT, 1, 
[Feature], [InterfaceNumber], NULL, 0, 1000);

If you want to pass data to/from the device then you cannot use 
clear/set feature.  These are only meant for setting and clearing 
boolean values. See:
http://www.beyondlogic.org/usbnutshell/usb6.shtml

Regards,
Travis

On 2/21/2014 2:04 PM, Travis wrote:
> You are still sending a "standard" clear feature request:
>
> 00000034    8.28595066    libusb0-sys:[clear_feature] recipient: 01 
> index: 0000 feature: 0000 timeout: 10
>
> I again suggest you use a vendor request type and update your firmware 
> accordingly.  I'd also increase the timeout to 1s for testing.
>
> That said, it looks like the request is making it to your device now 
> but it is your device that is not excepting it. Note that you have 
> changed what your device firmware need to look for; did you update 
> your firmware??
>
> If I remember correctly, a "A device attached to the system is not 
> functioning." error message after a control request generally means 
> your device did not recognize the request and set a STALL condition.
>
> Regards,
> Travis
>
> On 2/21/2014 1:33 PM, Rob Willard wrote:
>> Thanks for the responses!
>>
>> I have read up more, and still have the same type of issues. I have 
>> revisited my request type:
>>
>>     usb_control_msg(handle, USB_RECIP_INTERFACE | USB_ENDPOINT_IN, 1, 
>> 0, 0, buff, 64, 10);
>>
>> however still recieve errors in Windows (**this works fine under 
>> linux using usb.h). Should return a string, but am getting:
>>
>>     libusb0-dll:err [control_msg] sending control message failed, win 
>> error: A device attached to the system is not functioning.
>>
>> I did as Xiaofan suggested and loaded the debug version. The output 
>> is attached.
>>
>> Any further direction would be most appreciated...
>>
>> Rob
>>
>>
>> On 14-02-19 07:52 PM, Xiaofan Chen wrote:
>>> 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.
>>>
>>
>>
>>
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