Quad Decoder Question

[Canadian_EE]

I was looking through the quadrature decoder example for the nRF52 and I was having trouble getting an insight into how the three libraries (driver, driver legacy, and HAL) can be used. 

For instance, I haven't a clue what "_STATIC_INLINE uint32_t nrf_qdec_reportper_to_value ( uint32_t reportper )" does after reading the documentation. Can I get some more explanation on what this function actually does, as it doesn't seem clear to me. 

thank you

[Canadian_EE]

Hi Einar, 

    If this function reads the SAMPLEPER register, then why does it take an input? What does it do with that input? 

    

[Einar Thorsrud]

Hi,

Ah, sorry. I replied too quickly.  The nrf_qdec_reportper_to_value() is just a convenience function to convert the register value to the amount of samples per report, and for that the configured REPORTPER needs to be provided as input. You can refer to the (oneline) implementation in nrf_qdec.h and see how it is used in <nRF5 SDK>\examples\peripheral\qdec\main.c.