RE: Reading ACC and ACCDBL values from NRFX QDEC.

Sigurd — Fri, 22 Apr 2022 11:37:21 GMT

Hi,

[quote user=""]Can we have an example code? We have tried googling, but without luck.[/quote]

Take a look at how the sensor QDEC driver does it: https://github.com/nrfconnect/sdk-zephyr/blob/main/drivers/sensor/qdec_nrfx/qdec_nrfx.c

PS: Our nrf_desktop application uses the Sensor API to access the QDEC. https://github.com/nrfconnect/sdk-nrf/blob/main/applications/nrf_desktop/src/hw_interface/wheel.c

[quote user=""]What arguments does the read-function takes? It says pointer, but do we have to declare any variables to store it in the first place?[/quote]

Yes, you need to declare the variables. See this code: https://github.com/nrfconnect/sdk-zephyr/blob/v2.7.99-ncs1/drivers/sensor/qdec_nrfx/qdec_nrfx.c#L63

[quote user=""]It seems to count to somewhere between 5- and 6000 events per revolution, do you have any idea what the problems could be?[/quote]

No.

[quote user=""]How exactly does event.data.report.acc and event.data.report.accdbl work?[/quote]

This is explained in the Product specification. See this link: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/qdec.html?cp=4_2_0_35#concept_isq_pwd_4r