Using libusb with two or more devices

Hi !

Has anybody tried to use libusb to talk to two devices with equal
VID/PID but with different serialnumbers ?

Best regards,
K.E.Andersen

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Re: Using libusb with two or more devices

Kjell Eirik Andersen wrote:
>
> Hi !
>
> Has anybody tried to use libusb to talk to two devices with equal
> VID/PID but with different serialnumbers ?
>
Yes, no problem at all.

Note that Windows only reads serial numbers if they are encoded as US 
English. I had my serial numbers encoded as UK English for a long time 
and XP wouldn't read them. They've fixed it in Vista. Despite this 
libusb was fine with multiple devices with the same VID/PID and UK 
English serial numbers.

If you give your device a serial number (which is read by the OS!) then 
you won't get prompted for drivers if you plug the device into a 
different port.

You should see your devices details added to the registry in 
HKLM/SYSTEM/CurrentControlSet/Enum/USB/Vid_xxxx&PID_xxxx/<serial_string>

Dan.

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Re: Using libusb with two or more devices

Date: Wed, 04 Jul 2007 10:13:31 +0100
From: Dan Ellis <dan.ellis__libusb <at> newnhamresearch.com>
Subject: Re: [Libusb-win32-devel] Using libusb with two or more
	devices
To: libusb-win32-devel <at> lists.sourceforge.net
Message-ID: <468B64BB.4000003 <at> newnhamresearch.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

>Yes, no problem at all.

>Note that Windows only reads serial numbers if they are encoded as US 
>English. I had my serial numbers encoded as UK English for a long time 
>and XP wouldn't read them. They've fixed it in Vista. Despite this 
>libusb was fine with multiple devices with the same VID/PID and UK 
>English serial numbers.

>If you give your device a serial number (which is read by the OS!) then

>you won't get prompted for drivers if you plug the device into a 
>different port.

>You should see your devices details added to the registry in 
>HKLM/SYSTEM/CurrentControlSet/Enum/USB/Vid_xxxx&PID_xxxx/<serial_string
>

>Dan.

Hi Dan !

USB Audio

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Re: Using libusb with two or more devices

Kjell Eirik Andersen wrote:
>
> Thanks for your reply.
> I now have libusb working perfectly with two equal devices
> simoultanously (they have different serial numbers).
>
> I have done the following observations :
>
> 1. First install one device (which has not been installed before), and
> WinXP prompts for driver.
>
> 2. After succesful driver installation, run this command in a dos box:
> REG ADD HKLM\System\CurrentControlSet\Control\UsbFlags /v
> IgnoreHWSerNum<yourVIDPID> /t REG_BINARY /d 01
>
> 3. It is now possible to insert other equal devices in the same USB
> port, and WinXP will not prompt for driver.
>
> 4. If I insert a device in a different USB port, WinXP prompts for
> driver.
>
> I had no success in avoiding step 4 above, googling the subject hints
> that it wont be possible. My serialnumber is 5 digits, language code is
> 0x0409 (US English).
>
I'm surprised you get reprompted for a driver - you do have unique 
serial numbers?

I was referring to such statements as *http://tinyurl.com/ywb5dc

*Is your serial number correctly formatted as UTF-8, i.e. every other 
character zero? You should see your serial number in the registry ast 
the position I detailed, or in the properties dialogue box for the 
deivce in the device manager.

Dan.

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Using libusb with two or more devices

Kjell Eirik Andersen wrote:
>
> Thanks for your reply.
> I now have libusb working perfectly with two equal devices
> simoultanously (they have different serial numbers).
>
> I have done the following observations :
>
> 1. First install one device (which has not been installed before), and
> WinXP prompts for driver.
>
> 2. After succesful driver installation, run this command in a dos box:
> REG ADD HKLM\System\CurrentControlSet\Control\UsbFlags /v
> IgnoreHWSerNum<yourVIDPID> /t REG_BINARY /d 01
>
> 3. It is now possible to insert other equal devices in the same USB
> port, and WinXP will not prompt for driver.
>
> 4. If I insert a device in a different USB port, WinXP prompts for
> driver.
>
> I had no success in avoiding step 4 above, googling the subject hints
> that it wont be possible. My serialnumber is 5 digits, language code
is
> 0x0409 (US English).
>
>>I'm surprised you get reprompted for a driver - you do have unique 
>>serial numbers?

>>I was referring to such statements as *http://tinyurl.com/ywb5dc

>>*Is your serial number correctly formatted as UTF-8, i.e. every other 
>>character zero? You should see your serial number in the registry ast 
>>the position I detailed, or in the properties dialogue box for the 
>>deivce in the device manager.

>>Dan.

My serial num's are unique and correctly formated, and I see them in the
registry.

Looks like if I skip entering the IgnoreHWSerNum key, I don't get
reprompted when moving the same device from port to port. But in this
case I'm repromted when plugging in a new device with different serial
no.

If I do enter the IgnoreHWSerNum key, I get reprompted when moving the
same device from port to port. But in this case I'm not repromted when
plugging in a new device with different serial no.

Seems to me that I can't have it both ways ! (one and only one driver
install).

Best regards,
Kjell Eirik

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Re: Using libusb with two or more devices

Kjell Eirik Andersen wrote:
>
> Looks like if I skip entering the IgnoreHWSerNum key, I don't get
> reprompted when moving the same device from port to port. But in this
> case I'm repromted when plugging in a new device with different serial
> no.
>
> If I do enter the IgnoreHWSerNum key, I get reprompted when moving the
> same device from port to port. But in this case I'm not repromted when
> plugging in a new device with different serial no.
>
> Seems to me that I can't have it both ways ! (one and only one driver
> install).
>
That's correct, the only way you can have it both ways is to get the 
driver signed by Microsoft (which costs). You have to run the WHQL test 
and submit the report - I'm not sure of the whole process.

Dan.

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Re: Using libusb with two or more devices

Message: 1
Date: Tue, 10 Jul 2007 11:40:38 +0100
From: Dan Ellis <dan.ellis__libusb <at> newnhamresearch.com>
Subject: Re: [Libusb-win32-devel] Using libusb with two or more
	devices
To: libusb-win32-devel <at> lists.sourceforge.net
Message-ID: <46936226.6060903 <at> newnhamresearch.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Kjell Eirik Andersen wrote:
>
> Looks like if I skip entering the IgnoreHWSerNum key, I don't get
> reprompted when moving the same device from port to port. But in this
> case I'm repromted when plugging in a new device with different serial
> no.
>
> If I do enter the IgnoreHWSerNum key, I get reprompted when moving the
> same device from port to port. But in this case I'm not repromted when
> plugging in a new device with different serial no.
>
> Seems to me that I can't have it both ways ! (one and only one driver
> install).
>
>>That's correct, the only way you can have it both ways is to get the 
>>driver signed by Microsoft (which costs). You have to run the WHQL
test 
>>and submit the report - I'm not sure of the whole process.

>>Dan.

Well Dan, I think this concludes the topic. Thanks a lot for your
responses, they are highly appreciated.

Best regards,
Kjell Eirik 

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Re: libusb-win32 SVN version and HID backend

On 6/26/07, Stephan Meyer <ste_meyer <at> web.de> wrote:
> >
> > I built the new version with MinGW and it seems to run fine. I have two HID
> > device attached, a PICkit 2 USB programmer from Microchip and a Microsoft
> > Baisc Optical Mouse. Using the default system HID driver, I can still run the
> > test program. Can I assume that the HID backend is kind of working now?
> >
>
> It's only working partially. The backend is fully coded but has not been tested
> very much and I don't know if real data transfers actually work.
> What's still missing are more unit-tests (see tests/src folder) and a test firmware
> that's 100% compliant with the HID spec (see tests/firmware folder).
> It would be really nice if someone with good HID expertise would contribute
> to this backend.
>

It fails for interrupt transfer write.

C:\Myprog\pickit\pk2-3.00-alpha10>testpk2hid.exe -v
Found Microchip PICkit 2(TM) as device 'dev0003' on USB bus /bus0
Dev #3: Microchip Technology Inc. - PICkit 2 Microcontroller Programmer
  - Serial Number: PIC18F2550
  wTotalLength:         41
  bNumInterfaces:       1
  bConfigurationValue:  1
  iConfiguration:       0
  bmAttributes:         80h
  MaxPower:             50
    bInterfaceNumber:   0
    bAlternateSetting:  0
    bNumEndpoints:      2
    bInterfaceClass:    3
    bInterfaceSubClass: 0
    bInterfaceProtocol: 0
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     03h
      wMaxPacketSize:   64
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 02h
      bmAttributes:     03h
      wMaxPacketSize:   64
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0

C:\Myprog\pickit\pk2-3.00-alpha10>pk2 -on

PK2 version 3.00 alpha 10 - 2007/06/10
 pk2 -on

Locating USB Microchip PICkit2 (vendor 0x04d8/product 0x0033)
LIBUSB-DLL - trace: usb_init(): dll version: 1.0.0.0
Found USB PICkit as device 'dev0003' on USB bus /bus0
USB> 76

Fatal error> sendUSB() PICkit USB write failed

Regards,
Xiaofan

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bulk write is good but at bulk read: usb_reap_async: timeout error

Hello,

did anybody know an solution for this problem?

http://osdir.com/ml/lib.libusb.devel.windows/2006-07/msg00032.html

I have the same problem:

I can write to my device but can't read. (Bulkendpoint)

Libusb tells me this:

found 1 busses
usb_set_debug: Setting debugging level to 255 (on)
3 Bytes written
LIBUSB_DLL error: usb_reap_async: timeout error
Error usb_bulk_read: -116
usb_reap_async: timeout error (2)

My application works on linux without problems. Only on windows with
cygwin this problem occours.

Regards Bene

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