6.5 Test 5: Microphone Audio Live Streaming via SPDIF Transmitter

1. To apply the pdmc0 device-tree overlay at u-boot level, refer to the Apply the Device Tree Overlay to Enable PDM Microphones section.
2. To find the card number and device ID of the PMD microphones, SPDIF transmitter and SPDIF receiver, refer to the QUAD PMD Microphones, SPDIF Transmitter, and SPDIF Receiver sections.
3. To configure the Xear audio center application, refer to SPDIF Transmitter.
4. To stream capture sound from the PDM microphones through SPDIF TX to the headphones of the USB audio extender, use the following command:
   $ arecord -Dplughw:0,4 -r 48000 -c 2 -f S16_LE | aplay -Dplughw:0,6

   

   To stop streaming, press Ctrl + C.