Issue with Wrist Tilt Direction Detection on LSM6DS3TR-C
Issue with Wrist Tilt Direction Detection on LSM6DS3TR-C
Hardware & Software Details:
- Sensor: LSM6DS3TR-C
- Platform: Arduino
- Interface: I2C
Problem Statement:
We are working on detecting wrist tilt using the LSM6DS3TR-C sensor. While the tilt detection interrupt (`wrist_tilt_ia`) is triggering correctly, the tilt direction values (`wrist_tilt_ia.xpos`, `wrist_tilt_ia.xneg`, etc.) always remain zero, regardless of the actual movement.
Configuration Steps Taken:
Sensor Initialization:
Verified sensor presence using lsm6ds3tr_c_device_id_get().
Performed a software reset using lsm6ds3tr_c_reset_set().
Enabled Block Data Update (BDU) to ensure data consistency.
Sensor Configuration:
Set accelerometer output data rate to 26Hz (lsm6ds3tr_c_xl_data_rate_set()).
Set gyroscope output data rate to 26Hz (lsm6ds3tr_c_gy_data_rate_set()).
Configured accelerometer full scale to ±2g and gyroscope to ±2000 dps.
Wrist Tilt Detection Setup:
Enabled wrist tilt detection (lsm6ds3tr_c_wrist_tilt_sens_set()).
Configured tilt latency to 80 ms (lsm6ds3tr_c_tilt_latency_set()).
Configured tilt threshold to 22 (lsm6ds3tr_c_tilt_threshold_set()).
Enabled INT2 interrupt for wrist tilt (lsm6ds3tr_c_pin_int2_route_set()).
Configured tilt axis masking to detect tilts in X+ and X- directions (lsm6ds3tr_c_tilt_src_set()).
Tilt Detection Check:
Continuously reading lsm6ds3tr_c_all_sources_get() to check for tilt events.
wrist_tilt_ia interrupt is detected, but all axis direction values remain zero.
Even after configuring the `lsm6ds3tr_c_a_wrist_tilt_mask_t` register to enable detection on specific axes (X+, X-,Y+,Y-), the tilt direction does not update accordingly. We have verified that the sensor is properly initialized, and the interrupt fires, but we cannot obtain the tilt direction data.
Code: The code is added to this.
Expected Behavior:
- When tilting in a specific direction (e.g., X+), the corresponding register bit should indicate the movement.
Observed Behavior:
- The tilt interrupt (`wrist_tilt_ia`) triggers correctly.
- The tilt direction values (`wrist_tilt_ia.xpos`, `wrist_tilt_ia.xneg`, etc.) remain zero for all directions.
Output of the code provided:
page 55, 56 Configuration steps for Absolute Wrist Tilt
Page 17 from datasheet to configure AWT
Steps Taken:
1. Verified sensor detection (`whoami` check passes).
2. Enabled `wrist_tilt_sens` and configured `lsm6ds3tr_c_a_wrist_tilt_mask_t`.
3. Checked register values after tilt events, but they always remain zero.
4. Tried different threshold and latency values for tilt detection.
Question:
- Is there any additional register or configuration required to enable proper axis direction detection for wrist tilt?
- Has anyone successfully retrieved tilt direction data using this sensor, and if so, what modifications were necessary?
Any insights or suggestions would be greatly appreciated!