tap detection

we're running into some problems with tap detection :

with the 5.1 original firmware it looks like the tap events are triggered whatever the sensor is doing.
we tried to set the threshold and the direction of tap with these commands into the main function but it doesn't seem to change.

dmp_set_tap_axes (1);
dmp_set_tap_thresh (1,10000);
dmp_register_tap_cb(tap_cb);

(we just add the settings commands before the register tap function in the main..)