SAMC SDADC self-calibration issues

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Hi all,

 

One developing currently ATSAMC21G18-based device is supposed to use its internal SDADC to perform some relatively slow but accurate measurements. How can one implement it's periodical zero and gain offset error compensation/calibration?

Is it possible to implement this self-calibration with only software methods on existing board (e.g. without sch/pcb changing)?

The only document I've found on this topic is unfortunately not SDADC related.

 

Could you please share your experience and provide me with some tips how to solve this issue?

 

Any feedback is greatly appreciated.

Thanks in advance!