SAADC inconsistent buffer channnel

RE: SAADC inconsistent buffer channnel

Sumbo — Tue, 21 Apr 2020 10:34:06 GMT

Ok, I called the sampling twice. First with an interupt event. Secondly all 10m

RE: SAADC inconsistent buffer channnel

Sumbo — Fri, 17 Apr 2020 05:15:54 GMT

1. I don´t want to use PPI.

2.How I can update the RESULT.PTR and RESULT.MAXCOUNT if I use driver?

3.In the Interupt handler I use nrfx_saadc_Buffer_convert immediatley the conversation is finished and before the next conversation starts.

RE: SAADC inconsistent buffer channnel

haakonsh — Thu, 16 Apr 2020 08:28:01 GMT

It's a known issue.

The workaround is to use at least two buffers(ping-pong) and connect the END event to the START task via PPI.

You need to update the RESULT.PTR and RESULT.MAXCOUNT registers immediately after you've gotten a STARTED event (nrfx_saadc_buffer_convert). If the RESULT registers are not updated before the START task is triggered you will overwrite the previous buffer, therefore you will also need to make sure that you use large enough buffers.