nRF5340 Audio Dev Kit - Change Default I2S Pins

[Elray326]

Hello,

I am developing a custom PCB for use with the nRF5340 and would like to change the default pin values of the I2S module on my nRF5340 Audio DK first in order to validate. I would like to start by moving BCLK to P0.19. 

Can you please help me understand how to do so?

Thank you!

Best,

Louie

[Elray326]

I was able to reprogram the pins with the following code:

&pinctrl {
    i2s0_default {
	    group1 {
	        psels = <NRF_PSEL(I2S_SCK_M, 1, 12)>, <NRF_PSEL(I2S_SDOUT, 0, 13)>, <NRF_PSEL(I2S_LRCK_M, 0, 16)>;
        };
        group2 {
            psels = <NRF_PSEL(I2S_SCK_M, 1, 12)>, <NRF_PSEL(I2S_SDOUT, 0, 13)>, <NRF_PSEL(I2S_LRCK_M, 0, 16)>;
        };
    };
};

Please note that I had to use macros like "I2S_SCK_M" rather than "NRF_FUN_I2S_SCK_M" as it is listed in all the available documentation and in the header file, since the NRF_PSEL function seems to prepend the first argument in its parenthesis with "NRF_FUN_", which was not apparent to me until many attempts later. 

Please also note that the macro "I2S_SDOUT" maps to the functionality seen on the "DIN" pin on the nRF53 Audio Dev Kit, which is quite unintuitive. Personally, I believe that the pin label on the dev kit is mis-labeled.

Also, please note that I needed to deliberately re-program any I2S pin I wanted to use, even if I wanted to use it on its default pin. Once I remapped one pin, all other I2S pins were no longer active. I also had to re-pin the I2S pins for both group1 and group2. Could you please explain why there are two groups and what the difference is between them?

Thanks for all your help!