SAADC - NRF_DRV_SAADC_EVT_DONE

[Nabil]

Hello,

I'm currently working with sdk 11 on nRF52832.

I'm trying to acquire 20 value from SAADC every 10ms during 300uS.

I think that the rate is too high because p_event->type == NRF_DRV_SAADC_EVT_DONE occur only once per 20 value.

Is it normal ? Is it too fast ?

Thank you, Nabil

[Jørgen Holmefjord]

Yes, like that. Could you give some more details to why it is only working with SAMPLES_IN_BUFFER=1? Are you getting any error codes when calling any of the driver functions?

[Nabil]

It's always 0.

Is it possible that on low power we must have Samples_In_Buffer = 1 ? How can I see where it's blocked ?

[Jørgen Holmefjord]

What do you mean by "on low power"? How do you configure low power? There is a low power mode in SDK 12.x.0 and later, but you said you are using SDK 11?

[Nabil]

Then maybe I got that wrong because I'm using SDK 11. Sorry

Is it possible to call an ADC acquisition from a LCOMP_Callback ? I've read that there are shared ressources.

I think that the answer is YES because it works with SAMPLE_IN_BUFFER = 1 ..

Thank you

[Jørgen Holmefjord]

Yes, the SAADC and LPCOMP can be used at the same time, as long as the pins used are not the same. You can check error codes and hardfaults using the method described in this post.