LIS2DH12 interrupt configuration

RE: LIS2DH12 interrupt configuration

Nguyen Hoan Hoang — Fri, 21 Feb 2020 13:15:22 GMT

There is a good driver here github.com/.../accel_lis2dh12.cpp

RE: LIS2DH12 interrupt configuration

Fikri Saman — Fri, 21 Feb 2020 11:46:04 GMT

To anyone that is interested, here is the following configuration that I did and it works on my board :

void sensor_init(void){

    ...
    
    LIS2DH12_INT1_PIN_CFG(m_lis2dh12,0,1,0,0,0,0,1,0);
    err = lis2dh12_cfg_commit(&m_lis2dh12);
    APP_ERROR_CHECK(err);

    LIS2DH12_INT1_CFG(m_lis2dh12,50,0,0,0,0,0,1,0,1,0,1);
    err = lis2dh12_cfg_commit(&m_lis2dh12);
    APP_ERROR_CHECK(err);
    
    ...

}

RE: LIS2DH12 interrupt configuration

Otso Jousimaa — Fri, 21 Feb 2020 07:58:16 GMT

I'm not sure on how exactly it would work with that Nordic macro, here's how I do it on ST drivers:

https://github.com/ruuvi/ruuvi.drivers.c/blob/e23f24bf0902e0fb0edcaba00f28bd33dba64079/src/interfaces/acceleration/ruuvi_interface_lis2dh12.c#L949 . 

* Enable high-pass on INT1 to not trigger due to gravity.
* Enable Interrupt 1 on pin 2 (pin 1 is reserved for watermark in my case).
* Enable interrupt on XYZ axis high.
* Convert desired threshold to LSB, depending on the set scale.

It's possible to determine the exact bytes from datasheet.

RE: LIS2DH12 interrupt configuration

Fikri Saman — Fri, 21 Feb 2020 07:05:47 GMT

Hi Otso,

Sorry for the lack of detail. I'm still new to this but essentially I want LIS2DH12 to wake up the CPU when there is a huge movement.

RE: LIS2DH12 interrupt configuration

Otso Jousimaa — Thu, 20 Feb 2020 15:59:04 GMT

First you should let us know when exactly LIS2DH12 should wake the CPU. FIFO buffer overflow? Some activity threshold exceeded?

ST also provides drivers for their ICs, github.com/.../STMems_Standard_C_drivers