usb_f107: Fixed lost 4 bytes on control OUT transaction.

examples/stm32/f1/stm32-h107/usb_simple/usbtest.py

@@ -0,0 +1,20 @@
+import usb.core
+
+if __name__ == "__main__":
+	dev = usb.core.find(idVendor=0xcafe, idProduct=0xcafe)
+	if dev is None:
+		raise ValueError('Device not found')
+
+	dev.set_configuration()
+
+	import gtk
+	w = gtk.Window()
+	w.connect("destroy", gtk.main_quit)
+	toggle = gtk.ToggleButton("Toggle LED")
+	def toggled(button):
+		dev.ctrl_transfer(0x40, 0, button.get_active(), 0, 'Hello World!')
+	toggle.connect("toggled", toggled)
+	w.add(toggle)
+	w.show_all()
+	gtk.main()
+