As my first step I tried to change the pins of the already implementet 8 PDM-microphones to the pins of external PDM microphones. So I could see if that works. But I can´t find out how to do that.
In the module_usb_audio is a file called pcm_pdm_mic.xc in which I found the following code:
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/* Hardware resources */
in port p_pdm_clk = PORT_PDM_CLK;
in buffered port:32 p_pdm_mics = PORT_PDM_DATA;
in port p_mclk = PORT_PDM_MCLK;
clock pdmclk = on tile[PDM_TILE]: XS1_CLKBLK_3;
Can anybody tell me where PORT_PDM_DATA is defined? I guess it would be the right point to implement my changes...
Thanks for any help!!