How do you configure an MIS2DH to generate an interrupt on INT1 when motion is detected?

[Louis Loving]

I am trying to configure an MIS2DH to generate an interrupt on INT1 when the MISDH detects motion. I have code to configure the IIS2DLPC to do the same thing (it works) and I am trying to use that as a guide.

Here's the snippet of code where I am configuring the sensor based on the whoami register.

(I added the files that would be needed to actually answer the question.)

[Eleon BORLINI · Accepted solution]

Hi @Louis Loving​ ,

I would suggest you to use the IIS2DH Github repository (link) for a check on a MIS2DH-compatible device.

An example of base configuration is the following one (for example for the wake-up interrupt on INT1, iis2dh_wake_up.c:(

  /* High-pass filter enabled on interrupt activity 1 */
  iis2dh_high_pass_int_conf_set(&dev_ctx, IIS2DH_ON_INT1_GEN);
  /* Enable HP filter for wake-up event detection
   * Use this setting to remove gravity on data output
   */
  iis2dh_high_pass_on_outputs_set(&dev_ctx, PROPERTY_ENABLE);
  /* Enable AOI1 on int1 pin */
  iis2dh_pin_int1_config_get(&dev_ctx, &ctrl_reg3);
  ctrl_reg3.i1_aoi1 = PROPERTY_ENABLE;
  iis2dh_pin_int1_config_set(&dev_ctx, &ctrl_reg3);
  /* Interrupt 1 pin latched */
  iis2dh_int1_pin_notification_mode_set(&dev_ctx, IIS2DH_INT1_LATCHED);
  /* Set full scale to 2 g */
  iis2dh_full_scale_set(&dev_ctx, IIS2DH_2g);
  /* Set interrupt threshold to 0x10 -> 250 mg */
  iis2dh_int1_gen_threshold_set(&dev_ctx, 0x10);
  /* Set no time duration */
  iis2dh_int1_gen_duration_set(&dev_ctx, 0);
  /* Dummy read to force the HP filter to current acceleration value. */
  iis2dh_filter_reference_get(&dev_ctx, &dummy);
  /* Configure wake-up interrupt event on all axis */
  iis2dh_int1_gen_conf_get(&dev_ctx, &int1_cfg);
  int1_cfg.zhie = PROPERTY_ENABLE;
  int1_cfg.yhie = PROPERTY_ENABLE;
  int1_cfg.xhie = PROPERTY_ENABLE;
  int1_cfg.aoi = PROPERTY_DISABLE;
  iis2dh_int1_gen_conf_set(&dev_ctx, &int1_cfg);
  /* Set device in HR mode */
  iis2dh_operating_mode_set(&dev_ctx, IIS2DH_HR_12bit);
  /* Set Output Data Rate to 100 Hz */
  iis2dh_data_rate_set(&dev_ctx, IIS2DH_ODR_100Hz);

Can you please check if you have correctly configured the sensor?

-Eleon