Re: [Libusb-win32-devel] Reg:writepipe failed with error 87

[anshu p. <pan...@gm...>]

Hi Team,

This is my current project so I need to work with a sensor(scanner)
device.Now I have changed a little bit but writepipe has gone into blocking
state neither application responding nor device .
Changes are:
1-if (!Usb.SetAltInterface(usbHandle, (UCHAR)0, (UCHAR)0,
ALT_SETTING_NUMBER)) now set the interface to 0x01 to use bulk pipe
2-Usb.QueryPipe(usbHandle, (UCHAR)ALT_SETTING_NUMBER, (UCHAR)iEndpoint,
&pipeInfo);
 ALT_SETTING_NUMBER =0x01(i want to work with bulk pipe)
 8-Usb.WritePipe(usbHandle, 0x01, cmdBuffer, sizeof(cmdBuffer),
(PUINT)&lengthTransferred, NULL);
After changing the ALT_SETTING_NUMBER 0x0 to 0x01 writepipe has gone into
blocking state.
Please find attached screenshot of wireshark of setting interface and
writepipe.
Here I have a query regarding the destination address that has changed
2.1.0 to 2.1.1 when writepipe is called. Is this correct?
I am confused at this point why the destination address changed when the
writepipe is called.

Thanks,
Anshul

On Thu, Jul 23, 2020 at 7:25 AM Xiaofan Chen <xia...@gm...> wrote:

> On Wed, Jul 22, 2020 at 11:13 PM anshu panwar <pan...@gm...>
> wrote:
> >
> > Hi Team,
> > Thanks for the reply.
> > I have followed this link
> https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/winusb-installation
> to make my device as winusb without installing a custom driver.
> > After doing the above step my device(scanner device) is working as a
> winusb device and also i have downloaded libusbK-3.0.7.0-setup to work with
> this device.
> >
> > I have followed the steps below:
> > 1-LstK_Init
> > 2-LstK_Count
> > 3-LstK_FindByVidPid
> > 4-!LibK_LoadDriverAPI(Usb, deviceInfo->DriverID)
> > KUSB_DRVID_WINUSB:
> > printf("WinUSB driver api loaded!\n");
> > 5-!Usb.Init(usbHandle, deviceInfo)
> > 6-!Usb.QueryInterfaceSettings(usbHandle, 0x0, &interfaceInfo)
> > 7-Usb.QueryPipe(usbHandle, (UCHAR)ALT_SETTING_NUMBER, (UCHAR)iEndpoint,
> &pipeInfo);
> > ALT_SETTING_NUMBER =0x01(i want to work with bulk pipe)
> > 8-Usb.WritePipe(usbHandle, 0x01, cmdBuffer, sizeof(cmdBuffer),
> (PUINT)&lengthTransferred, NULL);
> > BYTE cmdBuffer[8+1] = {0x00,0x00,0x00, 0x01};
> >
> > till the 7 steps everything is successfully done but writepipe is not
> working .
> >
> > Is these steps are enough to understand or i should forward all the code
> which I am using currently.
> > Please update me about this.
>
> Step 8 is the most important, you can not just anyhow send to the
> device and expect
> the device to understand the command.
>
> You need to know the communication protocol in order to be able to
> communicate
> with the device.
>
> Is this a real project or you want to learn to use libusbk? If you
> just want to learn
> to use libusb or libusbk, then a scanner is not a good device to use.
> It is better
> to use a MCU development kit, like those Arm Cortex M0/M3/M4/etc
> development
> kit, from STM or other vendors.
>
>
>
> --
> Xiaofan
>
>
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