LSM6DS3 PEDOMETER

[TKCK.1]

Hi,

I'm trying to read step counts. I'm executing all pedometer related functions, but I get no any output.

Sincerely,

TalhaAnd While Loop

 

[Eleon BORLINI]

Hi @TKCK.1​ ,

I'm not sure if I well interpreted your code, but I suggest you to try to implement the in the way it is described in the LSM6DS3 application note AN4650, p.62:

1 Write 20h into CTRL1_XL // Turn on the accelerometer
// ODR_XL = 26 Hz, FS_XL = ±2 g
2 Write 3Ch into CTRL10_C // Enable embedded functions
3 Write 40h into TAP_CFG // Enable pedometer algorithm
4 Write 80h into INT1_CTRL // Step Detector interrupt driven to INT1 pin

This deploys the embedded pedometer feature, without the need of additional configuration of parameters such as debouncing and threshold.

-Eleon

[TKCK.1]

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[TKCK.1]

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[TKCK.1 · Accepted solution]

Hi @Eleon BORLINI​ ,

I applied the configurations in the application note as mentioned. But the result is the same, negative.

static void pedoConf(void)
{
    /* Holds reset variable. */
    uint8_t rst = 0;
    lsm6ds3_reset_set(&g_dev_ctx, PROPERTY_ENABLE);
    do
    {
        lsm6ds3_reset_get(&g_dev_ctx, &rst);
    }while(rst);
    /*  Enable Block Data Update */
    lsm6ds3_block_data_update_set(&g_dev_ctx, PROPERTY_ENABLE);
 
    lsm6ds3_int1_route_t    int1_route_t;
    /* Set Output Data Rate for Acc and Gyro */
    lsm6ds3_xl_data_rate_set(&g_dev_ctx, LSM6DS3_XL_ODR_26Hz);
    lsm6ds3_gy_data_rate_set(&g_dev_ctx, LSM6DS3_GY_ODR_26Hz);
    lsm6ds3_xl_full_scale_set(&g_dev_ctx, LSM6DS3_2g);
    lsm6ds3_gy_full_scale_set(&g_dev_ctx, LSM6DS3_2000dps);
 
    /* Enable pedometer */
    lsm6ds3_****_sens_set(&g_dev_ctx, 1);
 
    lsm6ds3_pin_int1_route_get(&g_dev_ctx, &int1_route_t);
    int1_route_t.int1_step_detector = PROPERTY_ENABLE;
    lsm6ds3_pin_int1_route_set(&g_dev_ctx, &int1_route_t);
    lsm6ds3_int_notification_set(&g_dev_ctx,LSM6DS3_INT_LATCHED);
 
    /* Reset steps of pedometer */
    lsm6ds3_****_step_reset_set(&g_dev_ctx, PROPERTY_ENABLE);
}

I checked the lsm6d3_****_sens_set(), whether it is setting or not the related registers. All the registers we want, as mentioned in the application note, are setting with this function.

/**
  * @brief   Enable pedometer algorithm.[set]
  *
  * @param  ctx      read / write interface definitions(ptr)
  * @param  val      change the values of ****_en in reg TAP_CFG
  * @retval          interface status (MANDATORY: return 0 -> no Error)
  *
  */
int32_t lsm6ds3_****_sens_set(stmdev_ctx_t *ctx, uint8_t val)
{
  lsm6ds3_ctrl10_c_t ctrl10_c;
  lsm6ds3_tap_cfg_t tap_cfg;
  int32_t ret;
 
  ret = 0;
  if (val == PROPERTY_ENABLE){
    ret = lsm6ds3_read_reg(ctx, LSM6DS3_CTRL10_C, (uint8_t*)&ctrl10_c, 1);
    if(ret == 0){
      ctrl10_c.func_en = PROPERTY_ENABLE;
      ret = lsm6ds3_write_reg(ctx, LSM6DS3_CTRL10_C, (uint8_t*)&ctrl10_c, 1);
    }
  }
  if(ret == 0){
    ret = lsm6ds3_read_reg(ctx, LSM6DS3_TAP_CFG, (uint8_t*)&tap_cfg, 1);
  }
  if(ret == 0){
    ret = lsm6ds3_read_reg(ctx, LSM6DS3_TAP_CFG, (uint8_t*)&tap_cfg, 1);
  }
  if(ret == 0){
    tap_cfg.****_en = (uint8_t)val;
    ret = lsm6ds3_write_reg(ctx, LSM6DS3_TAP_CFG, (uint8_t*)&tap_cfg, 1);
  }
  return ret;
}

I checked that and matched the other IMU's pedometer examples but it didn't work again.

                if(all_source.func_src.step_detected)
                {
                    /* Read steps */
                    lsm6ds3_number_of_steps_get(&g_dev_ctx, &steps);
                    UART_PRINT("Step: ");
                    UART_PRINT("%d\n", steps);
                    showError(ICON_HEART, NULL, steps, "Steps");
                }

In while loop, the way that I check if there is a detection or not. What can it possible error and how can I solve it?

Best regards,

Talha

[Ozone]

Is this related to an issue with your sourcecode, or to this forum ?

> I'm executing all pedometer related functions, but I get no any output.

Do you see ANY output from the accelerometer ?

Do a real-world evaluation, i.e. carry the board around while walking, and record the sensor output.

Let several different people do it.

Then you can evaluate possible "step thresholds".

[TKCK.1]

Hi @Ozone​ ,

Yes, I can read acc&gyro values in all axis(x, y, z). Also I'm able to read Free Fall interrupts, tapping interrupts..

I have already real-world sensor ouputs, I recorded them. But in our project, firstly we need to read the steps simply. So I need to execute via registers.

[Ozone]

So, as I understand it, the threshold setting via sensor config does not work, or not work properly.

Instead, consider evaluating the raw data directly.