How to enable tap detection Interrupts along with pedometer in MPU6050 using DMP

Hi,
I have successfully implemented pedometer in my wearable device application and now I need to wakeup the device to
show time on tap or on a gesture, I tried this by enabling the tap detection feature along with pedometer,
but not interrupts are created on taps, Below given is my code.

       if(mpu_init(NULL))

            while(){

                if(!mpu_init(NULL))

                    CPUdelay();

                    break;

                     }

        /* Wake up all sensors. */

        mpu_set_sensors (INV_XYZ_GYRO | INV_XYZ_ACCEL);

        mpu_set_sample_rate ();

       

       if(dmp_load_motion_driver_firmware())

            while(){

                     }

       

       int dmp_features;

       dmp_features = DMP_FEATURE_TAP|DMP_FEATURE_PEDOMETER;

       dmp_enable_feature(dmp_features );

       mpu_set_dmp_state ();

       mpu_set_int_level();

       dmp_set_interrupt_mode(DMP_INT_GESTURE);

       dmp_set_tap_thresh(TAP_Z, );

What could be going wrong in these codes?

Regards,
JOE