RE: SAADC sample via PPI not working without previous trigger

Yaxit — Mon, 24 Jun 2024 07:22:30 GMT

Hi Kenneth, could it be that after I get EVT_FINISH just triggering START is not sufficient to trigger the ADC?
I noticed this problem does not appear if I use double buffering. The difference with a single buffer is that when the buffer is full I get both a DONE and a FINISHED event.

RE: SAADC sample via PPI not working without previous trigger

Kenneth — Sat, 22 Jun 2024 12:35:48 GMT

Hello,

I suggest to check out the hardware description of the SAADC:
https://docs.nordicsemi.com/bundle/ps_nrf52832/page/saadc.html#d944e352

Do make sure you don't combine scan (more than one channel configured) with oversampling, that is not supported by the hardware. Also do check out the Errata list for the SAADC, maybe one of those impact you:
https://docs.nordicsemi.com/bundle/errata_nRF52832_Rev3/page/ERR/nRF52832/Rev3/latest/err_832_new.html

Kenneth