NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

RE: NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

ovrebekk — Fri, 25 Oct 2019 08:15:08 GMT

You welcome 🙂

RE: NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

mandha_amarr — Thu, 24 Oct 2019 12:54:40 GMT

Thank you so much overbekk

RE: NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

ovrebekk — Wed, 23 Oct 2019 08:21:25 GMT

Hi Amarr

The SAADC is designed to run seamlessly in the background, without interfering with time critical interrupts or radio activity.

It uses easyDMA to transfer ADC data to the RAM in parallel with other activity, and the SAADC SDK driver supports double buffering so that you can empty one buffer while the other one is being accessed by the SAADC peripheral.

In other words, as long as you scale the buffers according to the sample frequency you require you shouldn't have any problems doing continuous ADC sampling and BLE activity at the same time.

Best regards
Torbjørn

RE: NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

mandha_amarr — Tue, 22 Oct 2019 09:46:19 GMT

Hi overbekk,

Actually i want to sample continuously and use them in every 2 seconds.

will bluetooth pairing face an issue while i am sampling ADC data continuously?

Thank you

RE: NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

ovrebekk — Tue, 22 Oct 2019 06:52:10 GMT

Hi Amarr

Can you provide a bit more details on what you are trying to do?

You mean you want to sample continuously, and store the results every 2 seconds?

Or do you mean you want to only sample for 2 seconds and the stop the sampling?

You still want to sample every 400ms, or do you need a different sampling frequency?

What do you want to do with the ADC data after you have read it out from the ADC?

Best regards
Torbjørn

RE: NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

mandha_amarr — Mon, 21 Oct 2019 11:50:16 GMT

Hi overbekk.

Thank you so much for replay.

Now my source code working continuously after de-commenting nrf_drv_saadc_buffer_convert(..).

But i want read saadc samples within every 2 seconds, for achieving it. What modification i can do in above source code.

Please suggest me.

Thank you,

Rgds,

amarr

RE: NRF52832 SAADC not reading ADC Values after pairing with NRFConnect App

ovrebekk — Mon, 21 Oct 2019 11:30:57 GMT

Can you connect to the example without problems, or is that also problematic?

I tried embedding your code in the ble_app_uart example, and once I de-commented the call to nrf_drv_saadc_buffer_convert(..) in the SAADC callback I can see it running continuously, and establishing a connection to the DK is no problem.

Pairing is not fully supported by the ble_app_uart example, so if you're having issues with pairing and bonding I don't think it is related to the ADC sampling.

Best regards
Torbjørn