SAADC vs ADC

[David Reimondez Garcia]

Good afternoon,

I noticed in the nrfx driver folders there are two differente implementations for ADC: "nrfx_adc.c" and "nrfx_saadc.c"

What is the difference? Why two different implementations? Are they for different peripherals?

I am using nrf52 so I presume I should use SAADC. Could you elaborate a little bit on this?

Thanks a lot!

David

[Karl Ylvisaker]

Hello,

Are they for different peripherals?

Yes, and the differentiation here is made with the HAS_HW_NRF_ADC or HAS_HW_NRF_SAADC defines for the respective SoC.

I am using nrf52 so I presume I should use SAADC. Could you elaborate a little bit on this?

Correct - if you go into \v1.8.0\zephyr\dts\arm\nordic\YOUR_SOC you will see which peripherals it has got, and which drivers are compatible with that peripheral. For the nRF52840 for example, it has:

..
    compatible = "nordic,nrf-saadc";
..

While if you check an older nrf device, such as the nrf51822 it will have this instead:

..
    compatible = "nordic,nrf-adc";
..

Best regards,
Karl