libusb-win32-devel

[Libusb-win32-devel] Composite device - HID + custom

[Kitsok <ko...@ki...>]

Hello All!

I'm developing gaming device for flight simulation.
Part of the device is HID joystick, another part is custom input(encoders,
DACs, rotary switches, etc) and output (LED displays, PWM controlled gauges,
lamps, etc).

Originally it was pure HID device with input and output reports defind, but
I've found that I need more data to be transferred in and out. 

So my goal is to use Windows driver for HID part and LibUSB for custom part.
In host application I'm going to use bulk read and writes. 

The first (and major) question is - it is possible to write the inf file in
a way where the HID part(&MI_00) is served by windows driver and the custom
part is served by LibUSB?

The second question is actually regarding bulk transfer.
The device(AT91SAM7S256) has 4 endpoints, 2 of them (planned to be used by
custom part) has size of 64 bytes. Also the endpoints support ping-pong
transfer. 

I plan to bulk transfer 256-512 bytes in one usb_bulk_write/read call so I
suppose that there will be 4-8 consequentive data out/in transactions. The
question is -  will it work as expected or I can send no more than maximum
EP size in a time?

Thanks!

Best regards,
Konstantin Klubnichkin
-- 
View this message in context: http://www.nabble.com/Composite-device---HID-%2B-custom-tf4229374.html#a12031879
Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.

Re: [Libusb-win32-devel] Composite device - HID + custom

[Stephan M. <ste...@we...>]

> 
> 
> Hello All!
> 
> I'm developing gaming device for flight simulation.
> Part of the device is HID joystick, another part is custom input(encoders,
> DACs, rotary switches, etc) and output (LED displays, PWM controlled gauges,
> lamps, etc).
> 
> Originally it was pure HID device with input and output reports defind, but
> I've found that I need more data to be transferred in and out. 
> 
> So my goal is to use Windows driver for HID part and LibUSB for custom part.
> In host application I'm going to use bulk read and writes. 
> 
> The first (and major) question is - it is possible to write the inf file in
> a way where the HID part(&MI_00) is served by windows driver and the custom
> part is served by LibUSB?

Yes that's possible. See http://msdn2.microsoft.com/en-us/library/ms791091.aspx 
for details.
 
> 
> The second question is actually regarding bulk transfer.
> The device(AT91SAM7S256) has 4 endpoints, 2 of them (planned to be used by
> custom part) has size of 64 bytes. Also the endpoints support ping-pong
> transfer. 
> 
> I plan to bulk transfer 256-512 bytes in one usb_bulk_write/read call so I
> suppose that there will be 4-8 consequentive data out/in transactions. The
> question is -  will it work as expected or I can send no more than maximum
> EP size in a time?

The amount of data you can send or receive at once is only limited
by the OS and/or your system's RAM.

> 
> Thanks!
> 
> Best regards,
> Konstantin Klubnichkin
> -- 
> View this message in context: http://www.nabble.com/Composite-device---HID-%2B-custom-tf4229374.html#a12031879
> Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.
> 
> 
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Re: [Libusb-win32-devel] Composite device - HID + custom

[Kitsok <ko...@ki...>]

Hello Stephan!


Stephan Meyer wrote:
> 
> Yes that's possible. See
> http://msdn2.microsoft.com/en-us/library/ms791091.aspx 
> for details.
> 

Well, as far as I understood I need an inf-file for the part of the
composite device. 

Firstly I've installed libUSB as filter and had unknown device + HID device. 
After that I've modified an inf file made by the wizard from binary driver
distribution. 
I've removed .cat parts and added "&MI_01" to "devices" part:
[Devices]
-"PTJoy Composite Device"=LIBUSB_DEV, USB\VID_ffff&PID_3015
+"PTJoy Custom Device"=LIBUSB_DEV, USB\VID_ffff&PID_3015&MI_01

[Devices.NT]
-"PTJoy Composite Device"=LIBUSB_DEV, USB\VID_ffff&PID_3015
+"PTJoy Custom Device"=LIBUSB_DEV, USB\VID_ffff&PID_3015&MI_01

[Devices.NTAMD64]
-"PTJoy Composite Device"=LIBUSB_DEV, USB\VID_ffff&PID_3015
+"PTJoy Custom Device"=LIBUSB_DEV, USB\VID_ffff&PID_3015&MI_01

After that my device was recognized as "PTJoy Custom Device".
The test application successfully seen my devices, but the bulk example
failed on 
  if(usb_set_configuration(dev, 1) < 0)

If I do usb_set_configuration(dev,0) then I fail on usb_claim_interface(dev,
0)

After that I've de-installed libusb filter and tried to install libusb as
pure driver for my custom part. 
In this case the test application doesn't see libusb buses at all...

Could you please point me where to dig?

Thanks!

Best regards,
Konstantin Klubnichkin
-- 
View this message in context: http://www.nabble.com/Composite-device---HID-%2B-custom-tf4229374.html#a12123666
Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.