i1200 demo Board

Audio

Playback

By default, the i1200 demo board ouputs audio on the jack connector(headset).

The following command is an example that will start a music playback of a wav file that is already on the device.

aplay playback_file.wav

It is possible to play audio using the i2s out device present on the board instead. In this case, the device will need to be specified explicitly as follows:

aplay -D i2s_out playback_file.wav

Capture

By default, the i1200 demo board captures audio using the jack microphone.

The following command is an example that will start a mono record with a sampling rate of 48kHz and a signed 32bits bit format:

arecord -c 1 -r 48000 -f s32_le recorded_file.wav

It is possible to record using the 8 PDM mics or i2s in device present on the board. In this case, the device will need to be specified explicitly as follows:

To use dmic:

arecord -D dmic -c 2 -r 48000 -f s32_le recorded_file.wav

To use i2s_in:

arecord -D i2s_in -c 2 -r 48000 -f s32_le recorded_file.wav

40 pins header configuration

Here is the pin configuration to use the audio devices present on the 40 pins header:

Header pin	Function
7	EXT_AUDIO_P3V3
19	I2SO1_MCK
21	I2SO1_BCK
23	I2SO1_WS
25	I2SO1_D0
27	I2SO1_D1
29	I2SO1_D2
31	I2SO1_D3
18	DMIC1_SCK
20	DMIC1_DAT
26	DMIC2_DAT
30	DMIC3_SCK
32	DMIC3_DAT
36	DMIC4_SCK
38	DMIC4_DAT

I2S devices can be connected to these pins and, provided they don’t need any configuration and as a consequence don’t need any codec, they will work without any additional modifications. Moreover, a 3V3 alimentation is available at pin 7 for all devices that need it.