USB sequence

Topics: Developer Forum
Feb 1, 2010 at 10:39 PM


The Kontron-microETXexpress-SP platform have 4 USB port, and there are three USB devices plugged, Keyboard, mouse and Phidget Temperature sensor. When the "Temperature sensor" was plugged beyond the "keyboard" and mouse, the temperature sensor's driver - phidget.dll will not loaded, and when the temperature sensor was plugged before the "keyboard" and mouse, then the Phidget.dll driver loaded and worked fine. Why the "sequence" of USB device will cause the driver load failed?