How to vary gain in SAADC example nrf52832 SDK15.3 ?

[Pooja Vernekar]

Im using nrf52832 kit with sdk15.3 SAADC example for ADC output, which is working fine but im not getting how to vary gain.

i want to set gain these values  1,2,4,5,8,10,16,32 . Im using only 1 channel channel0 (AIN0).

Is it possible to set more than one gain value to only 1 channel ?

please suggest 

[Kenneth]

You will need to execute a new ADC measurement for each configuration, only 1 gain setting can be active at the time.

[Pooja Vernekar]

Hello Kenneth,

Im trying to configure or set gain in  SAADC example, for various gains it should operate but im not getting how to set gain register so that i get SAADC output depending on various gain and even i tried to change gain values in nrfx.saadc.h file but getting error. gains defined in nrfx.saadc.h files are default one but i want it to work as per my amplifier. So how can i define gains and make it work properly. Im using only 1channel AIN0

Presently its working properly with default gain values.

Please Suggest.

[Kenneth]

If you base your code on \examples\peripheral\saadc\ I believe this should be straight forward. Simply call nrf_drv_saadc_channel_init(), nrf_drv_saadc_buffer_convert(), and nrf_drv_saadc_channel_uninit() for each gain setting you want to sample.

[Pooja Vernekar]

but if i define gain in nrf.saadc.h then it gives error.

it works fine for default gain, but i want to set gain with different values. How can i do that ?