additional info;
My USBGamepad.cfg found here
/opt/retropie/configs/all/retroarch-joypad
looks like this
input_device = “USB Gamepad ”
input_driver = “udev”
input_start_btn = “9”
input_exit_emulator_btn = “9”
input_up_axis = “-1”
input_a_btn = “1”
input_b_btn = “2”
input_reset_btn = “2”
input_down_axis = “+1”
input_right_axis = “+0”
input_state_slot_increase_axis = “+0”
input_select_btn = “8”
input_enable_hotkey_btn = “8”
input_left_axis = “-0”
input_state_slot_decrease_axis = “-0”
