nRF52832 SAADC Occasionally returns 0xFFFF

RE: nRF52832 SAADC Occasionally returns 0xFFFF

Jørgen Holmefjord — Thu, 13 Jun 2019 14:50:10 GMT

I'm not sure what you want help with. As described in the answers here it is normal that the SAADC can return negative values. Store it in a int16_t variable and set negative values to 0 if you do not want them in your application.

RE: nRF52832 SAADC Occasionally returns 0xFFFF

Siddharth rana — Thu, 13 Jun 2019 13:03:39 GMT

Hello jorgen.

Right now I am facing the same issue .I get 0xfff value in buffer can u help me out

RE: nRF52832 SAADC Occasionally returns 0xFFFF

Jørgen Holmefjord — Tue, 14 Feb 2017 14:55:33 GMT

Hi,

It is normal that the SAADC can return slightly negative values. See this thread.

Best regards,

Jørgen

RE: nRF52832 SAADC Occasionally returns 0xFFFF

CurtisHx — Tue, 14 Feb 2017 14:51:22 GMT

@Wojtek Yes, 0xFFFF is -1 in int16_t, which makes the read voltage very, very close to 0 (-14mV with my configuration). I'm not used to an ADC returning negative, and I'm trying to figure out if I'm doing something wrong or this particular ADC will return negative.

RE: nRF52832 SAADC Occasionally returns 0xFFFF

Wojtek — Tue, 14 Feb 2017 14:42:16 GMT

I think 0xFFFF = -1 in int16_t. So, it is almost 0.