Sound Card

EarPhone && Speak

Both EarPhone and Speak are dual-channel interfaces

Use the aplay command to play audio in wav format

   #path-to indicates the absolute path to store the audio
   aplay /path-to/audio-name.wav

Mic

The Mic uses the chip's ADC1 peripheral. It is disabled by default and
needs to be enabled using the following steps.

   amixer -c 0 cset name='ACodec ADC Switch' 1						# Enable ADC1
   amixer -c 0 cset name='ACodec Digital Gain Volume' 0			# Set the digital volume of ADC1 to maximum. 0 is maximum, 127 is minimum
   amixer -c 0 cset name='ACodec PGA Gain Volume' 31				# Set the digital volume of ADC1 to maximum

   amixer -c 0 cset name='SAI2 Receive PATH0 Source Select' 1
   amixer -c 0 cset name='SAI2 Receive PATH1 Source Select' 0

Mic records audio

   arecord -l											#View all available MIC devices.
   arecord -Dhw:0,0 -f cd -d 10 /path-to/audio.wav	#Select the sound card and record audio.
   #Note: Mic only supports mono recording

For more detailed configuration information about the RV1126B acodec,
please download the "RV1126B acodec Configuration Document"
(https://www.t-firefly.com/doc/download/333.html#other_932) for
reference.