Audio Reference

1. Audio Input (AI)¶

1.1. Input Interface Type¶

There are the interfaces supported by AI. Please refer the table below to get the specific info.

Table 1-1 Specification

1.2. Device ID¶

Different device ID represent different interface type when AI initialize.

1.3. Amic Usage Scenarios¶

• 1-channel amic

  It is mainly used in building intercom to collect 1-channel sound to realize outdoor and indoor intercom.

  Confirm which group the amic connected before use.

  

  The corresponding device ID and channel index are as follows.

  Pin	Device ID	Channel Index
  PAD_AUD_MICIN0	0/5	0
  PAD_AUD_MICIN1	0/5	1
  PAD_AUD_MICIN2	⅘	2

  Reference demo:

  

• 2-channels amic

  It is mainly use in smart phone two-way collection to collect and transmit audio for handle and headphone.

  Confirm which group the amic connected before use. The corresponding device ID and channel index are as follows.

  Pin	Device ID	Channel Index
  PAD_AUD_MICIN0 & PAD_AUD_MICIN1	0/5	0 & 1

  Reference demo(Collect two MONO data separately):

  

  If you need to collect the data of L/R stereo separately, the corresponding relationships of pin, device ID and channel index are as follows:

  Pin	Device ID	Channel Index
  PAD_AUD_MICIN0 & PAD_AUD_MICIN1	0/5	0

  Reference demo:

  

• 3-channels amic

  It is mainly use in smart phone to collect audio for handle, headphone and headset. The corresponding relationships of pin, device ID and channel index are as follows:

  Pin	Device ID	Channel Index
  PAD_AUD_MICIN0 & PAD_AUD_MICIN1	5	0 & 1

  Reference demo:

  

1.4. Dmic Usage Scenarios¶

• Configure pin to dmic mode

  Confirm which set of pin is taking effect before use dmic, then configure digmic-padmux to the corresponding mode in pioneer3.dtsi.

  The following dtsi config is corresponding to PAD_KEY6 (D1) & PAD_KEY7 (D0) & PAD_KEY8 (CLK) used in evaluation board.

  

• 4-dmic

  AI_DEV_ID_DMIC(1) is the device ID no matter 2dmic is used or 4dmic, and ChannelCount determines how many channels of audio need to be collected.

  Reference demo:

  

1.5. I2s RX Usage Scenarios¶

• I2s rx pin config

  Confirm which set of pin is taking effect before use i2s rx, then configure the corresponding mode in PADMUX.

  The following config is corresponding to PAD_GPIO3 & PAD_GPIO4 & PAD_GPIO5 used in evaluation board.

  <PAD_GPIO3          PINMUX_FOR_I2S_RX_MODE_6      MDRV_PUSE_I2S_WCK>,
  <PAD_GPIO4          PINMUX_FOR_I2S_RX_MODE_6       MDRV_PUSE_I2S_BCK>,
  <PAD_GPIO5          PINMUX_FOR_I2S_RX_MODE_6       MDRV_PUSE_I2S_SDI>,
  

  Refer to HW CheckList for the correspondence between pin and mode.

• 2-channels i2s

  Reference demo:

  

• TDM i2s

  Use TDM i2s when receiving more than two channels of i2s data.

  Reference demo(take 4-channels as an example):

  

1.6. Line In Usage Scenarios¶

The use of Line in is the same as amic, except that there is a difference in setting Gain. For details, please refer to AI API.

2. Audio Output(AO)¶

2.1. Output Interface Type¶

2.2. Device ID¶

2.3. Lineout Usage Scenarios¶

• Lineout Amp config

  It supports two-channel Line out dual-channel output and single-channel DAC0/DAC1 attribute control.(such as volume adjustment, mute/unmute, etc.)

  1. In Line out mode, AoChn = 0 controls the left channel, AoChn = 1 controls the right channel.

  2. According to the HW layout, the method of configuring amp_gpio is as follows

     1. Modify the sound device tree node amp-gpio in kernel\arch\arm\boot\dts\pioneer3.dtsi, and set PAD_SR_IO15/PAD_SR_IO16 to the left/right channel of amp_gpio to control the pin, and the default value is 1.

        

     2. Set PAD_SR_IO15/PAD_SR_IO16 to MDRV_PUSE_AIO_AMP_PWL/MDRV_PUSE_AIO_AMP_PWR in kernel\arch\arm\boot\dts\pioneer3-ssc020a-s01a-demo-camera-padmux.dtsi (Open *_padmux.dtsi used by config according to the actual situation)

        

• 1-channel Lineout

  Confirm which pin is taking effect before use Lineout.

  

  Pin	Device ID
  PAD_AUD_LINEOUT_L0	AO_DEV_ID_DAC0 (2)
  PAD_AUD_LINEOUT_R0	AO_DEV_ID_DAC1 (3)

  Reference demo:

  

• 2-channels Lineout

  1. When 2-channels L/R using together, the corresponding relationships between Pin and Device ID are as follows.

     Pin	Device ID
     PAD_AUD_LINEOUT_L0 & PAD_AUD_LINEOUT_R0	AO_DEV_ID_DAC0_1 (0)

     Reference demo:

     

  2. 2-channels Lineout using independent

     Use DeviceID (AO_DEV_ID_DAC0 & AO_DEV_ID_DAC1) on the basis of 1-channel Lineout using.

2.4. I2s Tx Usage Scenarios¶

• I2s Tx pin configure

  Confirm which set of pin is taking effect before use i2s rx, then configure the corresponding mode in PADMUX.

  The following config is corresponding to PAD_GPIO3& PAD_GPIO4 and PAD_GPIO5 used in evaluation board.

  <PAD_GPIO6          PINMUX_FOR_I2S_TX_MODE_6       MDRV_PUSE_I2S_SDO>,
  <PAD_GPIO7          PINMUX_FOR_I2S_TX_MODE_6       MDRV_PUSE_I2S_BCK>,
  <PAD_GPIO8          PINMUX_FOR_I2S_TX_MODE_6       MDRV_PUSE_I2S_WCK>,
  

  Refer to HW CheckList for the correspondence between pin and mode.

• 2-channels i2s tx

  Reference dome:

  

  

3. Demo¶

AI/AO DemoCode