How to use nrf_drv_saadc_calibrate_offset function? (negative saadc value problem)

[Yclee]

Hello.

I am testing saadc function.

When I was connect the saadc pin with ground level, the saadc value represents negative value.

So I am searching the similar problem and I found the calibration is one method.

However, I don't know how to use the calibrate function.

I added the code like below, and I can't build the project.

   err_code = nrf_drv_saadc_calibrate_offset();

   APP_ERROR_CHECK(err_code);

How can I added this function ? and Is there any other method can I test to remove negative saadc value ?

Thank you for reading my questions.

Best Regards,

Yclee.

[Jørgen Holmefjord]

Hi,

You can see an example of how the offset calibration function is used in this example.

As mrono mention, this will not help with negative values. If you don't want negative values in your application, just set the samples to 0 in your application if the value is below 0.

Best regards,
Jørgen

[Yclee]

Thank you for reply. I will check the example, and setting the negative value to zero.