Am I not configuring right my SAADC handler for low power?

RE: Am I not configuring right my SAADC handler for low power?

Sigurd — Mon, 14 Aug 2017 14:37:41 GMT

Did you solve this issue in this post?

RE: Am I not configuring right my SAADC handler for low power?

ndarkness — Mon, 14 Aug 2017 06:36:13 GMT

HI Sigurd, thanks for replying

I have used ble_app_proximity as guideline to implement the SAADC measurements, I managed to make it running. however, I think my settings for measuring VDD input are not completely correct. I see how the ADC saturates ( it gives back its Vref = 0.6V) instead the expected voltage, around 3.3V since I am powering it from the micro usb of the DK. I know that this has to do with the ADC_GAIN to be set, in order to perform the right conversion. What is the gain that I should set to achieve such a conversion? Currently I use something like this adc_val / ((adc_gain / ADC_REFERENCE_VOLTAGE) * pow(2, ADC_RESOLUTION_BITS)) with adc_gain = NRF_SAADC_GAIN1

RE: Am I not configuring right my SAADC handler for low power?

Sigurd — Fri, 11 Aug 2017 12:31:09 GMT

Hi,

You would have to take a look at what error code you are getting in the app_error_fault_handler. See here on how to debug and find the error code. As mentioned here, I recommend taking a look at the ble_app_proximty example. This example uses the saadc, and not the simulator that is used in the hrs example.