ADC Values Volatile

RE: ADC Values Volatile

snoopy20 — Tue, 29 Sep 2020 08:21:36 GMT

I'm mostly not using the SDK as I prefer more direct control, so I can say the PIN isn't being used. I'll close it though as I have a solution by doing the read on the PIC.

RE: ADC Values Volatile

Jørgen Holmefjord — Tue, 29 Sep 2020 08:12:47 GMT

Have you tested running your code on a nRF52832 DK, to see if you get similar results there?

I can't think of anything that could be initialized on this pin (AIN4/P0.28) by the SDK, could there be something in your application that configures/drives this pin?

RE: ADC Values Volatile

snoopy20 — Mon, 28 Sep 2020 21:56:24 GMT

Hi Jorgen,

As the signal is shared I've worked around it by doing the ADC read on the PIC and sending over SPI (the PIC doesn't have a problem with it).

// store voltage
//NRF_SAADC->CH[6].PSELP = 4;
//NRF_SAADC->CH[6].CONFIG = SAADC_CH_CONFIG_GAIN_Gain1_2 << SAADC_CH_CONFIG_GAIN_Pos | SAADC_CH_CONFIG_TACQ_15us << SAADC_CH_CONFIG_TACQ_Pos;

I've not seen this on other ADC channels which suggests it's pin related.

Regards,

Andrew

RE: ADC Values Volatile

Jørgen Holmefjord — Mon, 28 Sep 2020 14:04:47 GMT

Hi,

Where do you set the analog input for the SAADC channel (NRF_SAADC->CH[6].PSELP) in your application, and which pin do you use? I'm not able to reproduce similar results in my test-application.

Best regards,
Jørgen