Issue with IMU Sensor (LSM6DSV16X) Sample Rate in Sensor Hub Mode

[SaeedZadeh]

I am using an IMU sensor in sensor hub mode (LSM6DSV16X, LIS2MDL) with the FIFO interrupt interval set at 30 Hz. The data is sent over BLE. It works perfectly when using RTT, but when I disable debug mode, the sample rate drops to around 1 Hz.

Could someone please help me resolve this issue?

Thank you.

[Edvin]

Hello,

How do you trigger the interrupts at 30Hz? If you try to toggle a button or something in the events that sample the IMU, does it trigger at 30Hz or 1Hz after you disable debug?

Best regards,

Edvin

[SaeedZadeh]

Thank you for your reply. When the IMU's FIFO is full, an interrupt will occur on the interrupt pin. The interrupt rate will decrease to 1 Hz as if something changes or is missed when I disable the RTT configuration.

[Edvin]

So what triggers the IMU readings in the first place? Do you have a timer set up at 30Hz or something?

What HW are you running this on? nRF5340DK? Or do you have a custom board?

[SaeedZadeh]

The IMU triggers the interrupt once the data is ready based on its Output Data Rate . So, I don't use time to trigger the interrupt; the sensor will trigger it when it's initialized. I am using the nrf5340DK.

[Edvin]

Hello,

Ok, so you are saying that when you disable RTT logging, the sensor starts acting slower? Have you tried analyzing the IMU sensor pins to check whether there is any difference in the serial data traffic when it is acting normal and when it is not?

Best regards,

Edvin