Ribamar Santarosa de Sousa wrote:
Hello,
There are some USB interfaces (such some kinds of HID) that don't have
OUT endpoints and the unique manner to send them data is through
control msg like Set_Report requests (chapter 7 of HID 1.1
specification).
However, in the kernel interface for usb_control_msg() we need to pass
a pipe which is obtained through usb_sndcrtlpipe(), which in turn
requires an endpoint address. What endpoint should be passed to
usb_sndctrlpipe() in these cases?
Libusb's interface for usb_control_msg() doesn't require this pipe as
parameter[1]. How is this pipe discovered before the calling of the
kernel's usb_control_msg()?
[1] http://libusb.sourceforge.net/doc/function.usbcontrolmsg.html
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Looks like it's a minor number (such that num % 16 == 0)
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