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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