AOM-DB3500 AUDIO MIC1/OUT1

AOM-3821 supports three kinds of sound cards: 

“1 rt5640-codec”(9696EG57001)
“2 hdmi”, 
“3 dp0”.

AUDIO MIC1/OUT1（Compatible with ROM-EG57）

HW Pin Header

I2S0 Connector Pin Definition
Pin	Signal	I/O	Description
1	I2S0_VDDA		I2S0 3.3V source
2	GND		Ground
3	I2S0_VDDA		I2S0 3.3V source
4	I2S0_SDIN_3.3	I	I2S0 Serial Data IN 3.3V Level
5	I2S0_SDOUT_3.3	O	I2S0 Serial Data OUT 3.3V Level
6	I2S0_LRCK_3.3	I	I2S0 Left/Right Clock
7	I2S0_BCLK_3.3	I	I2S0 Bit Clock
8	AUD0_MCK	I	Audio0 Master Clock
9	N/A		Not Applicable
10	GND		Ground
11	I2S0_I2C_CLK	I	I2S0 I2C clock input from host.
12	MIC_BIAS1	I	For I2S0 Microphone Bias Voltage
13	I2S0_I2C_DAT	I/O	I2S0 I2C Data
14	GND		Ground
15	N/A		Not Applicable
16	I2S0_HP_R	I	I2S0 Right Headphone
17	I2S0_MIC_IN	I	I2S0 Microphone IN
18	GND		Ground
19	GND		Ground
20	I2S0_HP_L	I	I2S0 Left Headphone

Get sound card ID

# cat /proc/asound/cards
0 [rockchiphdmiin ]: rockchip_hdmiin - rockchip,hdmiin
 rockchip,hdmiin
 1 [rockchiprt5640c]: simple-card - rockchip,rt5640-codec
 rockchip,rt5640-codec
 2 [rockchiphdmi0 ]: rockchip-hdmi0 - rockchip-hdmi0
 rockchip-hdmi0
 3 [rockchipdp0 ]: rockchip-dp0 - rockchip-dp0
 rockchip-dp0

Record
Take Card ID 1 for example:

# arecord -Dplughw:1,0 -f S16_LE -r 16000 -d 10 -t wav test.wav

Playback
Take Card ID 1 for example:

# aplay -Dplughw:1,0 -t wav test.wav