Microphone/Arduino Shield example for the nrf9160?

RE: Microphone/Arduino Shield example for the nrf9160?

lanwer — Tue, 28 Jan 2020 15:02:25 GMT

Hi, I would be very grateful if you could share your code with me. That's exactely what I am looking for.

RE: Microphone/Arduino Shield example for the nrf9160?

SCombellack — Sat, 02 Feb 2019 17:58:54 GMT

Yes, fabulous. I have tried it and it appears to work great; using the sequence options to get the SAADC peripheral to take readings on a timer, then return when the appropriate number of readings have been taken. Great!

RE: Microphone/Arduino Shield example for the nrf9160?

Håkon Alseth — Thu, 31 Jan 2019 12:29:18 GMT

Always happy to help 🙂

Let me know if there's any issues that should come up!

Kind regards,

Håkon

RE: Microphone/Arduino Shield example for the nrf9160?

scottjenson — Wed, 30 Jan 2019 14:36:31 GMT

Thanks Hakon, we'll check this out! Much appreciated

RE: Microphone/Arduino Shield example for the nrf9160?

Håkon Alseth — Wed, 30 Jan 2019 09:47:44 GMT

Hi,

I think this is the one you're looking for?

https://github.com/NordicPlayground/fw-nrfconnect-zephyr/blob/master/include/adc.h#L188

The ADC API in zephyr might not satisfy your requirements, and if that is the case, I'd recommend that you include nrf_saadc.h directly and communicate with that API to override or expose the deeper level functions as a workaround for now. We are looking into exposing all the functionality of our drivers/peripherals in the ncs code base, but it takes a bit of time until we know how to approaching this in the best possible way.

Kind regards,

Håkon

RE: Microphone/Arduino Shield example for the nrf9160?

SCombellack — Tue, 29 Jan 2019 22:09:38 GMT

Love the sample! Is it possible to see a sample that uses more of the SAADC facility of the nRF91? If possible I'd like to see an example that uses the task feature to take a sample on a timer event and then easyDMA to publish the result to RAM. It could be that the sample code is already doing some of that, but it's hidden in the enums or something.

RE: Microphone/Arduino Shield example for the nrf9160?

Håkon Alseth — Tue, 15 Jan 2019 11:41:03 GMT

Hi,

You could use the PDM peripheral as well, as there's many digital microphones that use this bus as well.

In order to use the SAADC peripheral to perform ad conversions in nrf connect sdk, there's a process that needs to be performed first:

1. Add the SAADC peripheral to the non-secure region:

After this line: https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/samples/nrf9160/secure_boot/src/main.c#L336

you must append:

	secure_boot_config_peripheral(
		NRFX_PERIPHERAL_ID_GET(NRF_SAADC_S), 0);

Then build and flash this onto the device.

2a. Adding the SAADC to the project requires a nrf9160_pca10090.overlay file to hold:

&adc {

    status = "ok";

};

2b. Then you need to add the ADC driver itself to the project in "prj.conf":

CONFIG_ADC=y
CONFIG_ADC_0=y
CONFIG_ADC_NRFX_SAADC=y

Now, you can add the functions needed for using the ADC in your example. I made an example here to show what's needed:

https://github.com/Rallare/fw-nrfconnect-nrf/blob/nrf9160_samples/samples/nrf9160/adc/src/main.c

Kind regards,

Håkon

RE: Microphone/Arduino Shield example for the nrf9160?

scottjenson — Fri, 11 Jan 2019 21:37:02 GMT

Actually, doing further research indicates that that previous shield was a bit over kill. A much simpler microphone (there are many) just produces an analog out that can go into one of the Arduino pins. If I use that approach, I just need the nrf9160 code example to read the analog pin. It'll be my job to stash it away.