PDMCLKCTRL setting to custom CLK for higher sampling rate

I'm trying to record audio from Nano 33 BLE Sense which is using an nrf52840 microcontroller. But the default PDM library available doesn't allow me to record at a higher sampling rate and so I started looking through nordic documentation about the controller to adjust the sampling rate and found a few settings available for PDM_CLK and was wondering can I set a custom CLK frequency so that it is 2MHz?

Reference Documentation: infocenter.nordicsemi.com/index.jsp

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0 user15146 over 4 years ago

Hi,

can I set a custom CLK frequency so that it is 2MHz?

You can try to set PDMCLKCTRL to 0x10000000 to get 2MHz, but note that only the values listed in the PS have been fully and thoroughly tested. If you are using values that are not listed in the PS, we cannot guarantee that they will work and it will be on your own risk.
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0 user15146 over 4 years ago

Hi,

can I set a custom CLK frequency so that it is 2MHz?

You can try to set PDMCLKCTRL to 0x10000000 to get 2MHz, but note that only the values listed in the PS have been fully and thoroughly tested. If you are using values that are not listed in the PS, we cannot guarantee that they will work and it will be on your own risk.
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