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There is a problem adding I2S code.

Hello

I am using nrf52832 and sdk v17.0
I recently succeeded in controlling several ws2812 LEDs through I2S. And now I'm going to combine these codes with the others.

However, when I debug the combined code, 'i2s_init()' outputs the following error:

This is the code I used to control led with i2s.

And I attach the combined code below. (It controls devices including LEDs with buttons and apps.)

pca10040,h

6747.nRF5_SDK_17.0.0_9d13099.zip

 Can I know about this problem because the same problem occurs even if I erase the code of main() and run i2s and led code?

Thank you in advance.

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