how schedule other thread when PDM interrupt occurs

RE: how schedule other thread when PDM interrupt occurs

Charlie — Mon, 16 Sep 2024 09:17:06 GMT

Hi,

For this application logic design, it is really hard to give suggestions with simple words in this discussion, so we have application samples for your reference.

Your application is quite similar to nRF5340 Audio applications (nordicsemi.com), nrf/applications/nrf5340_audio/src/audio properly shows the audio data sources and flow management including DMIC as source before it is processed by LC3 code and BLE audio transceiver. You can try to port this part and reuse it for your BLE+Opus application.

Best regards,

Charlie

RE: how schedule other thread when PDM interrupt occurs

Jon-Yang — Thu, 12 Sep 2024 03:05:31 GMT

HI ，Charlie

Thanks a lot for your advice , I will try this method.

Since I need to capture PCM data every 10 milliseconds, do you mean I need a timer and then read the data every 10 milliseconds?

Can you give me more suggestions?

Thanks a lot .

RE: how schedule other thread when PDM interrupt occurs

Charlie — Wed, 11 Sep 2024 12:05:20 GMT

Hi Yangbin,

Is your project based on NCS/Zephyr or nRF5 SDK?

Have you referred to this sample sdk-zephyr/samples/drivers/audio/dmic at d066e02a743b6090ec276c22af03184b10b9aa8c · nrfconnect/sdk-zephyr (github.com)? In this sample you use dmic driver which on top of nrfx pdm, so you do not need to deal with interrupts directly.

Hardware interrupts have high priory than threads, you can learn about Preventing Interruptions in certain situations from Interrupts — Zephyr Project Documentation.

Best regards,

Charlie