PDM & TWI aren't working together well (SDK 15.3.0)

RE: PDM & TWI aren't working together well (SDK 15.3.0)

Håkon — Wed, 04 Dec 2019 18:18:59 GMT

Hi,

Good that your program does not crash anymore!
Which lagging are you referring to?

Btw, did you try to run you program with RTT istead of UART to preserve logging?

The case you refer to ended since the developer who raised the issue didn't follow up our answers.
This is not a known issue to our knowledge.

RE: PDM & TWI aren't working together well (SDK 15.3.0)

Or — Tue, 03 Dec 2019 11:01:09 GMT

I commented out all the NRF_LOG_*() calls, now it doesnt crash, but the lagging issue isnt solved.

RE: PDM & TWI aren't working together well (SDK 15.3.0)

Håkon — Thu, 28 Nov 2019 08:19:59 GMT

Hi,

It seems that there at least is a problem with the logging, hence the log backend uart error.
I have asked our engineer who handled the case you refer to, hopefully he can give us some more insight into what they figured out back then.

I am wondering if you are trying to log too much over the UART peripheral.
Could you try to reduce your amount of printing, but still use all three sensors?
You could try to increase the UART baud rate The default baud rate is 115200, but could be higher.

If reduced debug logs is not an option, or increasing the baud rate did not help I will suggest you to change logging backend to RTT.
This is easily done in the sdk_config.h, selecting default logging backend to RTT instead of using UART.
You need RTT viewer in order to read the RTT logs.