RE: nRF52 reading AIN0 to AIN4 ... AIN4 fails

Carsten Wulff — Thu, 07 Jul 2016 20:48:23 GMT

Hi Maurizio,

As specified in the PS SAADC stores 16-bit signed integers.

I usually use

int16_t ex1_result[EX1_COUNT];
NRF_SAADC->RESULT.PTR = (uint32_t)&ex1_result[0];

I would recommend always using signed integers for SAADC, because even in single ended mode you can get negative values if you have a close to zero input.

I have a "scan multiple channel" barebone example at nRF52_saadc_barebone

RE: nRF52 reading AIN0 to AIN4 ... AIN4 fails

Stefan Birnir Sverrisson — Tue, 05 Jul 2016 16:38:10 GMT

Hi Maurizio

Good that you found a workaround. I have actually not configured SAADC manually that much as you are doing. I have used the nrf_drv_saadc to do the details for me. The example in the nrf5 SDK uses the driver and so do the saadc examples on Github, in case you are interested.