We are seeing something quite odd with readings.
We have the device completely static on a bench, at 1kHz, as initialised below. The readings bounce around as explained elsewhere, but occassionally we get what looks like a random sample that appears in our history.
We can run for 24 hours and suddenly, somewhere in the middle the readings will jump from 0.7 G in compeltely static state to 2.4G (after conversion).
This seems to be exacerbated by the HP filter. With it running the data varies much more frequently and will exceed 3G within a typical 10minute period, turning it off makes this less likely but not impossible.
Does anybody have specific experience with this?
Do note that we are polling the sensor periodically, and its my understanding that wiht the BDU feature turned on we should not see this effect due to polling.
here is my init code, with the filter enabled.
...
h3lis331dl_boot_set(&gSensor_ctx, PROPERTY_ENABLE);
HAL_Delay(100);
/* Enable Block Data Update */
h3lis331dl_block_data_update_set(&gSensor_ctx, PROPERTY_ENABLE);
/* Set full scale */
h3lis331dl_full_scale_set(&gSensor_ctx, H3LIS331DL_100g);
/* Set Output Data Rate */
h3lis331dl_data_rate_set(&gSensor_ctx, H3LIS331DL_ODR_1kHz);
/* Configure filtering chain */
h3lis331dl_hp_path_set(&gSensor_ctx, H3LIS331DL_HP_ON_OUT);
h3lis331dl_hp_bandwidth_set(&gSensor_ctx, H3LIS331DL_CUT_OFF_8Hz);
h3lis331dl_axis_x_data_set(&gSensor_ctx, 1);
h3lis331dl_axis_y_data_set(&gSensor_ctx, 1);
h3lis331dl_axis_z_data_set(&gSensor_ctx, 1);
h3lis331dl_hp_reset_get(&gSensor_ctx);
