nRF52, problem reading SAADC - AIN7

RE: nRF52, problem reading SAADC - AIN7

LMf — Fri, 09 Dec 2022 07:06:53 GMT

Hi, I am experencing similar situation with AIN7. How did you get different values in AIN7? I always see the same value while in other analog inputs work fine

RE: nRF52, problem reading SAADC - AIN7

Ole Bauck — Mon, 19 Sep 2016 10:52:16 GMT

Sorry, I misread, I thought you were using nrf_drv_saadc_buffer_convert(..). I will remove that text from my answer. nrf_drv_saadc_sample_convert() is blocking so your code is fine.

RE: nRF52, problem reading SAADC - AIN7

Nano — Mon, 19 Sep 2016 07:51:06 GMT

Thanks a lot, that solved it.

For the reading of the values, I thought that the blocking call would take care of that situation, is there any possible scenario where what you describe can happen?

RE: nRF52, problem reading SAADC - AIN7

Ole Bauck — Fri, 16 Sep 2016 14:28:03 GMT

NRF_SAADC_INPUT_AINn is not the same as the channel used. Channels range from 0-7 and corresponds to NRF_SAADC->CH (see Product Specification). NRF_SAADC_INPUT_AIN7 is the input that is passed to NRF_SAADC->CH[n].PSELP or NRF_SAADC->CH[n].PSELN and range from 1-8 (0 equals NC -> Not Connected). You are trying to use channel 8 which does not exist.