Free fall detection

Hello everyone!
I am trying to implement a free fall detector using the IOT sensor, I want the any motion detection to be replaced by the free fall detection interrupt.
I tried and tried but it keeps not working, and here is my code :
in user sensor.c :

void user_bmi160_config_low-g_intr( void ) {

bmi160_set_low_g_enable(BMI160_ENABLE);

bmi160_set_low_high_g_source(0x01);

/* BMI160 Datasheet pg 63, int1 is hi level active with output - push pull */
bmi160_set_intr_1_output_enable(BMI160_ENABLE);
bmi160_set_intr_1_output_level(BMI160_LEVEL_HIGH);
bmi160_set_intr_1_output_odrn_pshpll(BMI160_OPEN_DRAIN);
bmi160_set_intr_1_output_edge_level(BMI160_EDGE);

bmi160_set_intrs_latched(BMI160_LATCH_DUR_2_5_MILLI_SEC);

bmi160_set_low_g_intr_1(BMI160_ENABLE);
bmi160_set_reg_int_map_0(0x01);
bmi160_set_reg_int_map_1(0x00);
bmi160_set_reg_int_map_2(0x00);

bmi160_set_low_g_threshold(0xff);
bmi160_set_low_g_mode(0x00);

}
and in user_platform.c: I change it to inspect the low-g interrupt :

#定义BMI160_INT_STATUS1_LOWG_INT_FLAG (
void wkup_intr_non_connected_cb( void )
{
uint8_t bmi160_int_status=0;
if(GetBits16(SYS_STAT_REG, PER_IS_DOWN)){
periph_init();
}
arch_ble_ext_wakeup_off();

//bmi160_get_reg_int_status_2(&bmi160_int_status );
bmi160_get_reg_int_status_1(&bmi160_int_status );
//bmi160_get_reg_int_status_0(&bmi160_int_status );

DBG_MSG1("WOKE UP SF %x\r\n",(int)bmi160_int_status);

#ifdef USE_low_g_WAKEUP
if( bmi160_int_status&BMI160_INT_STATUS1_LOWG_INT_FLAG ){
wrbl_env.adv_mode = ADV_MODE_FAST;
bmi160_soft_reset();
EXECUTE_DEFAULT_OPERATION_VOID(default_operation_adv);
}
#else
if( bmi160_int_status&0x08 ){
wrbl_env.adv_mode = ADV_MODE_FAST;
bmi160_set_sensor_state(ACC_SUSPEND);
bmi160_set_sensor_state(GYR_SUSPEND);
EXECUTE_DEFAULT_OPERATION_VOID(default_operation_adv);
}
#endif
}
Any help is highly appreciated
Thanks.