How to configure LSM6DS3 inactivity / activity capabilities

[CWell.1]

Hello,

I was trying to setup an inactivity/activity program in Arduino using a Xiao Sense NRF52840, that has the LSM6DS3 chip on it, and with using the register i was trying to recognize inactivity and activity. If anyone has insight as to why this isnt working it would be appreciated.

#include "LSM6DS3.h"
#include "Wire.h"
 
#define CLEAR_STEP      true
#define NOT_CLEAR_STEP  false
 
//Create a instance of class LSM6DS3
LSM6DS3 lsm6ds3(I2C_MODE, 0x6A);    //I2C device address 0x6A
uint16_t detectCount = 0;
 
void setup() {
    Serial.begin(9600);
    while (!Serial);
    if (lsm6ds3.begin() != 0) {
        Serial.println("Device error");
    } else {
        Serial.println("Device OK!");
    }
 
    if (0 != config_free_fall_detect()) {
        Serial.println("Fail to configure!");
    } else {
        Serial.println("Success to Configure!");
    }
}
 
void loop() {
    uint8_t readDataByte = 0;
    //Read the wake-up source register
    lsm6ds3.readRegister(&readDataByte, LSM6DS3_ACC_GYRO_WAKE_UP_SRC);
    //Mask off the FF_IA bit for free-fall detection
    readDataByte &= 0x10;
    if (readDataByte) {
        detectCount ++;
        Serial.print("Inactivity Detected!  ");
        Serial.println(detectCount);
    }
    delay(10);
}
 
int config_free_fall_detect(void) {
    uint8_t error = 0;
    uint8_t dataToWrite = 0;
 
    dataToWrite |= LSM6DS3_ACC_GYRO_BW_XL_200Hz;
    dataToWrite |= LSM6DS3_ACC_GYRO_FS_XL_2g;
    dataToWrite |= LSM6DS3_ACC_GYRO_ODR_XL_416Hz;
 
    error += lsm6ds3.writeRegister(LSM6DS3_ACC_GYRO_CTRL1_XL, dataToWrite);
    error += lsm6ds3.writeRegister(LSM6DS3_ACC_GYRO_WAKE_UP_DUR, 0x42);
    error += lsm6ds3.writeRegister(LSM6DS3_ACC_GYRO_WAKE_UP_THS, 0x42);
    error += lsm6ds3.writeRegister(LSM6DS3_ACC_GYRO_MD1_CFG, 0x80);
 
    return error;
}

[Federica Bossi]

Hi @CWell.1​ ,

Welcome to ST Community!

After WAKE_UP_THS you need to write E0h to TAP_CFG.

Let me know if this works!