Ok, I managed to play a .wav file using alsaaudio and python. The strange thing is that I get audio output on TP4, but according to schematic for Luckfox pico plus, it's a CODEC_MICBIAS port. Is the schematic on the luckfox website not up-to-date? If so, can you share an updated version.

Thanks, I tried the command from the document:
rk_mpi_ao_test -i audi.pcm --sound_card_name=hw:0,0 --device_ch=2 --device_rate=16000 --input_rate=16000 --input_ch=2

Here is the output I get:
# rk_mpi_ao_test -i audi.pcm --sound_card_name=hw:0,0 --device_ch=2 --device_rate=16000 --input_rate=16000 ...

Hi,
I'm planning to use LuckFox Pico Plus for audio playback and audio recording, so I need to use line-out and line-in ports. As far as I understand, CODEC_LINEOUT output is signle-ended and referenced to ground, so I can connect it directly to headphones/amplifier, is this correct?
For audio ...