RE: nrf52832 sensor ADC read example questions.

Jørgen Holmefjord — Mon, 06 Nov 2017 10:18:06 GMT

Hi,

The input is selected by setting the PSELP/PSELN registers, as described in the SAADC peripheral documentation. In the GitHub example, this happens on line 22. The example is using single-ended channel, and use VDD as input. You can connect any of the analog input pins by setting PSELP using the line:

NRF_SAADC->CH[0].PSELP = SAADC_CH_PSELP_PSELP_AnalogInputx << SAADC_CH_PSELP_PSELP_Pos;

Where x is replaced by the AIN number (from 0-7). The analog input numbers correlate to GPIO pin numbers as described in the pin assignment documentation.

Best regards,

Jørgen

RE: nrf52832 sensor ADC read example questions.

MikeLemon — Sat, 04 Nov 2017 11:25:01 GMT

Now I've found this simpler example:

github.com/.../main.c

But I can't see the line of code that assigned the ADC channel to the physical pin on the board... So I assume it now read 1/6 of ic's VDD is so:

How do you assign this channel 0 to a physical pin?