On Tue, September 13, 2016 2:26 am, Eddie Stanley wrote: > SUMMARY: > Logitech Precision Gamepad shows axis activity upon connection > > > DESCRIPTION: > When I connect my Logitech Precision Gamepad (or the machine starts up > with it connected) it exhibits activity on both axes until I press a > button/press the d-pad. Hi Eddie, No solution(s) for you but what I think you are seeing is default values in the HID system, until the device actually sends some data. Don't know if you can prompt it to send a frame to get sync'ed. BTW the incoming frames can be seen on the 'hidraw' device with something like (adjust '8' to number of bytes your device sends). -- root@retrobox:/home/simon# hexdump -v -e '8/1 "%02x " "\n"' < /dev/hidraw0 08 00 00 5e 8a 32 cd 99 08 00 00 5e 8a 32 cd 99 -- > Note - I'm not sure whether the d-pad should be classified as a pair of > axes or a pair of hats - it is a digital d-pad though, *not* analog. There has always been debate on this, it boils down to how the device is described in the HID descriptor. Either a HAT (with null position) or a D-PAD. Linux treats HATs 2 axis joystick. You can use 'hidrd' to decode the descriptor (from '/sys/bus/hid/devices/<device>/descriptor') to confirm what it reports. I have a Logitech game pad which does the same, the HID descriptor contains -- Logical Maximum (7), Physical Maximum (315), Report Size (4), Report Count (1), Unit (Degrees), Usage (Hat Switch), ; Hat switch (39h, dynamic value) Input (Variable, Null State), Unit, -- A possible work around is described here: http://hans.fugal.net/blog/2007/06/02/joystick-hat-in-x-plane-in-linux/ Cheers, Simon. -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
