RE: nRF52840 PDM microphone causes interrupt issue – code runs only when PDM-related lines are commented

Maria Gilje — Wed, 11 Feb 2026 12:01:38 GMT

Hello,

[quote user=""]

I am working with the nRF52840 SoC and trying to capture audio using a PDM microphone.

When I run my application with all code enabled, throwing error, i have pasted the error in text file .

[/quote]

This line from your build log points to the issue while building:

C:/Users/2768/untitled/src/main.c:52: undefined reference to `nrfx_pdm_irq_handler'

The build system expects an instance to be specified. I resolved the build error by specifying nrfx_pdm_0_irq_handler on line #52 in main.c

[quote user=""]

However, when I comment out lines 50–57 and line 61 in main.c, the code:

[/quote]

In the prj.conf printf is configured to appear on RTT and not the serial terminal. Do you also get no RTT output?

Best regards,

Maria

Maria Gilje — Tue, 10 Feb 2026 15:43:43 GMT

Hello,

I just want to let you know that I have picked up this case and I'll share some feedback tomorrow.

Best regards,

Maria