Genio 1200-EVK

Overview

On Genio 1200-EVK, there are 4 playback hardware and 4 capture hardware.

../../../../_images/sw_rity_app-dev_audio_evk_afe_g1200.svg

Genio 1200-EVK audio data route diagram

Definitions of data pin channels

Data Pin Name

Number of Channels

DMIC1_DAT

2

PCM_DO

2

PCM_DI

2

I2SIN_D0

2

I2SO2_D[0-3]

2

AUD_DAT_MOSI[0-1]

1

AUD_DAT_MISO[0-1]

1

AUD_DAT_MISO2

1

HDMITX

8

DPTX

8

HDMIRX

8

AU_HPL

1

AU_HPR

1

AU_LOL

1

AU_VIN1

1

AU_VIN0

1

AU_VIN2

1

AU_VIN3

1

  • Playback

    • Earphone-Out Jack

    • Speaker-Out Jack

    • PCM Out

    • HDMI/DP Audio Out

  • Capture

    • PCM In

    • Earphone-In Jack

    • AMIC In

    • DMIC In

    • HDMI Rx

Genio 1200-EVK board provides a 3.5mm Earphone jack which has both playback and capture functions. Another 3.5mm Speaker jack for line out which has no built-in audio amplifier. PCM interface is used for the transmission of audio-digital signals. Genio 1200-EVK board was designed with three analog microphones and two digital microphones.

The Genio 1200-EVK does not have I2S pins, and it also does not support I2S feature. If the user wishes to use I2S with the Genio 1200-EVK, they will need to perform additional configuration work on their board. For more details, please refer to the I2S porting guide.

Furthermore, the Genio 1200-EVK supports HDMI RX.

For the position of the earphone jack, speaker jack, HDMI/DP port, DMIC, and AMIC, please refer to Board Top View.

../../../../_images/sw_rity_app-dev_audio_evk_route-g1200-2.svg

The route between the hardware and the device nodes

  • pcmC0D0p plays the sound to Earphone-Out Jack or Speaker-Out Jack.

  • pcmC0D2p plays the sound to PCM Out.

  • pcmC0D5p plays the sound to either HDMI Audio Out or DP Audio Out.

  • pcmC0D7c records the voice from HDMI Rx.

  • pcmC0D8c records the voice from PCM In.

  • pcmC0D10c records the voice from Earphone-In Jack.

  • pcmC0D14c records the voice from DMIC In.

  • pcmC0D15c records the voice from AMIC In.

Audio Interfaces

The audio system provides audio data exchange between the device and external audio components. Audio interfaces play a crucial role in enabling high-quality sound recording and playback. This section aims to offer a thorough guide to the integrated audio interface on the EVK.

The following table will detail the interfaces accessible on the Genio 1200-EVK, and specify if the software is supported.

Genio 1200-EVK Audio Interfaces

Audio Interfaces

Channel Count

Dai-Link Name

Genio 1200-EVK

PMIC DL

2

DL_SRC_BE

V (MT6365 PMIC)

PMIC UL

2

UL_SRC1_BE/UL_SRC2_BE

V (MT6365 PMIC)

PDM1

2

DMIC_BE

V

PDM2

2

DMIC_BE

V

PDM3

2

DMIC_BE

V

PDM4

2

DMIC_BE

V

PCM (with SRC)

2

PCM1_BE

V (Pin Header)

HDMIRX

8

MULTI_IN1_BE

V

HDMITX

8

ETDM3_OUT_BE

V

DPTX

8

DPTX_BE

V

Note

For information about if the software is supported, please refer to the release notes.

MT6365 Audio CODEC Interfaces on Genio 1200-EVK

Audio Interfaces

Channel Count

Genio 1200-EVK

ACCDET

NA

X

Playback (Earphone)

2

V

Playback (Speaker)

1

V

Record (Earphone)

2

V

Record (AMIC)

3

V

Playback

Earphone Jack Speaker

By default, the Genio 1200-EVK board plays the audio to the earphone jack speaker.

Run the provided command to verify that the sound output is coming from the earphone jack:

amixer -c mt8395evk cset name='HP Mux' 'Audio Playback'

Please make sure to set LOL Mux to open before using the earphone jack. Otherwise, there will be noise when playing music.

You can use aplay to play the music through the earphone jack.

aplay is a command-line sound file player for the ALSA sound card driver. For more details about aplay, please refer to aplay.

aplay -D jack_speaker sample.wav

You can adjust the gain of the earphone jack. The range of the value is from 0 to 30. The value 0 represents the maximum volume and the value 30 represents the minimum volume.

Use the following command to control the volume:

amixer -c mt8395evk cset name='Headset Volume' 30
amixer -c mt8395evk cset name='Headset Volume' 0

Speaker Jack Speaker

The default setting of HP Mux works for earphone jack playback. HP Mux is a mixer switch for the earphone jack and speaker jack. It has 5 cases in HP Mux:

  • Item #0 Open

  • Item #1 LoudSPK Playback

  • Item #2 Audio Playback

  • Item #3 Test Mode

  • Item #4 HP Impedance

You should set HP Mux Open when using speaker jack playback.

amixer -c mt8395evk cset name='HP Mux' 'Open'
amixer -c mt8395evk cset name='LOL Mux' 'Playback_L_DAC'

Please make sure to set HP Mux to open before using the speaker jack. Otherwise, there will be noise when playing music.

Use aplay to play the music through the speaker jack.

aplay -D jack_speaker sample.wav

PCM Out

Use aplay to play the music through the PCM interface.

aplay -D pcm_out sample.wav

HDMI/DP Speaker

  • Only HDMI playback

    To enable audio playback from a HDMI device, please first enable the HDMI_OUT_MUX.

    amixer -c mt8395evk cset name='HDMI_OUT_MUX' on
amixer -c mt8395evk cset name='DPTX_OUT_MUX' off

    After using it, turn off the HDMI_OUT_MUX.

    amixer -c mt8395evk cset name='HDMI_OUT_MUX' off

    Use aplay to play the music via an HDMI device.

    aplay -D hdmi_dp_out sample.wav

  • Only DP playback

    The default configuration for Genio 1200-EVK is to enable HDMI and disable DP. If you want to use DP audio, you need to load the dtbo file to enable DP.

    To enable audio playback from a DP device, please first enable the DPTX_OUT_ MUX.

    amixer -c mt8395evk cset name='DPTX_OUT_MUX' on
amixer -c mt8395evk cset name='HDMI_OUT_MUX' off

    After using it, turn off the DPTX_OUT_MUX.

    amixer -c mt8395evk cset name='DPTX_OUT_MUX' off

    Use aplay to play the music via the DP device.

    aplay -D hdmi_dp_out sample.wav

  • HDMI + DP playback

    If you want to use HDMI and DP devices at the same time, remember to load the display-hdmidp.dtbo file and enable both the HDMI_OUT_MUX and DPTX_OUT_MUX.

    amixer -c mt8395evk cset name='HDMI_OUT_MUX' on
amixer -c mt8395evk cset name='DPTX_OUT_MUX' on

Warning

When there are no HDMI or DP devices connected to the platform, the corresponding MUX should be set to off.

Capture

PCM In

To record voice through the PCM interface, use the following command. The recorded file will be named sample.wav.

arecord -D pcm_in -c 2 -r 48000 -f S32_LE -d 10 sample.wav

Earphone Jack Microphone

By default, the Genio 1200-EVK board records the voice from the earphone jack microphone. The default setting of PGA_L_Mux: AIN1 is used for headset recording, but PGA_L_Mux is also used by AMIC.

Run the following command to set the PGA_L_Mux:

amixer -c mt8395evk cset name='PGA_L_Mux' 'AIN1'

The range of the Headset volume value from small to loud is 0 to 4.

amixer -c mt8395evk cset name='PGA1 Volume' 3

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

arecord -D jack_mic -r 48000 -f S32_LE -d 10 sample.wav

Digital Microphone

You can record the voice from the DMIC port.

Here is an example command that records a 10-second file named sample.wav using DMIC:

arecord -D dmic -c 2 -r 48000 -f S32_LE -d 10 sample.wav

Analog Microphone

To record voice from the AMIC port, you should change the default setting of PGA_L_Mux from AIN1 to AIN0.

amixer -c mt8395evk cset name='PGA_L_Mux' 'AIN0'

There are three analog microphones on Genio 1200-EVK, remember to set the MISO1_MUX.

amixer -c mt8395evk cset name='MISO1_MUX' 'UL1_CH2'

The range of the AMIC volume value from small to loud is 0 to 4.

Volume setting:

amixer -c mt8395evk cset name='PGA1 Volume' 3

The following command is an example that will record a 10 seconds file using AMIC:

arecord -D amic -r 48000 -f S32_LE -d 10 sample.wav

HDMI RX

HDMI receiver refers to a hardware component that is capable of receiving high-definition video and audio signals transmitted through an HDMI interface.

Before using the HDMI RX, set the MULTI_IN1_MUX first.

amixer -c 0 cset name='MULTI_IN1_MUX' HDMI_RX_I2S

The following command is an example that will record a 10 seconds file named rec.wav:

arecord -D hdmi_rx -r 48000 -c 2 -f S16_LE -d 10 rec.wav

AFE Interconnection

This section will provide a more detailed explanation of the audio data transmission path between the SoC and external codec for each audio devices.

The Audio Front-End of the SoC plays a critical role in managing audio functions. This chapter aims to familiarize you with the AFE interconnections on the SoC, highlighting how the audio components collaborate to process and output sound.

By default, the platform has configured the audio data transmission paths within the AFE for each audio device. Users generally do not need to modify these settings unless there are special circumstances. It is important to ensure that the switches on the path are turned on before use.

If the user needs it, they can also see all the pre-configured paths and all the replaceable paths in the platform driver.

Earphone Playback

The platform is equipped with a 3.5mm Earphone Jack that supports stereo audio playback.

Complete Route: MEMIF DL2 -> Mix Engine -> PMIC Interface -> Audio DAC -> HPL/HPR Mux -> Headset Volume Control -> Earphone

../../../../_images/sw_rity_app-dev_audio_evk_headphone_playback_g1200.svg

Earphone playback audio data complete route

The data pathway in the Mix Engine has been pre-configured. The DL2 memory interface is defaultly connected to I070 and I071.

Please verify whether the input and output components for the earphone playback in the Mix Engine have been connected.

amixer -c mt8395evk cset name='O176 I070 Switch' on
amixer -c mt8395evk cset name='O177 I071 Switch' on

The audio data will be transmitted to the PMIC via the PMIC DL interface. After the data enters the PMIC, it first goes into the DAC, which converts the digital signal into the analog signal.

A mixer control called DAC In Mux is used to determine if the audio data should pass through the DAC. Set it to Normal Path for general use.

amixer -c mt8395evk cset name='DAC In Mux' Normal Path

Next, the audio data output from the DAC will be sent to both the HP Mux and the LOL Mux. HP Mux and LOL Mux are used to select whether to output audio through earphone or speaker.

To use earphone playback, you need to set the HP Mux as Audio Playback and set the LOL Mux as Open:

amixer -c mt8395evk cset name='HP Mux' 'Audio Playback'
amixer -c mt8395evk cset name='LOL Mux' 'Open'

After choosing earphone as the audio playback device, you can adjust the hardware gain using the Headset Volume mixer control.

amixer -c mt8395evk cset name='Headset Volume' 4

Speaker Playback

The platform has a 3.5mm Speaker Jack that supports mono audio playback.

Complete Route: MEMIF DL2 -> Mix Engine -> PMIC Interface -> Audio DAC -> LOL Mux -> Lineout Volume -> Speaker

../../../../_images/sw_rity_app-dev_audio_evk_speaker_playback_g1200.svg

Speaker playback audio data complete route

The speaker playback and earphone playback use the same data source. The DL2 memory interface is defaultly connected to I070 and I071.

amixer -c mt8395evk cset name='O176 I070 Switch' on
amixer -c mt8395evk cset name='O177 I071 Switch' on

The audio data will be transmitted to the PMIC via the PMIC DL interface. In the PMIC, the audio data output from the DAC will be sent to both the HP Mux and the LOL Mux.

The default settings of HP Mux and LOL Mux are configured for earphone playback. To use speaker playback, you need to set the HP Mux as Open and set the LOL Mux as Playback_L_DAC.

amixer -c mt8395evk cset name='HP Mux' 'Open'
amixer -c mt8395evk cset name='LOL Mux' 'Playback_L_DAC'

After choosing the speaker as the audio playback device, you can adjust the hardware gain using the Lineout Volume mixer control.

amixer -c mt8395evk cset name='Lineout Volume' 4

HDMI Playback

The platform supports up to 8-channel HDMI Audio output.

Regarding HDMI and DP devices, the platform has implemented a Jack Control feature to detect whether HDMI or DP has been connected to the platform. Therefore, please ensure that the corresponding device is connected to the platform before starting the configuration adaptation.

Complete Route: MEMIF DL10 -> afe_conn_hdmi -> ETDM_OUT3 Interface -> HDMI device

../../../../_images/sw_rity_app-dev_audio_evk_hdmi_playback_g1200.svg

HDMI playback audio data complete route

HDMI audio playback defaults to using DL10 and is connected to the eTDM_out3 interface.

The HDMI audio and DP audio are both output from the same AFE memory interface in the SoC. However, they are controlled separately by the HDMI_OUT_MUX and DPTX_OUT_MUX.

To use HDMI audio, please ensure that HDMI_OUT_MUX is connected.

amixer -c mt8395evk cset name='HDMI_OUT_MUX' 1

DP Playback

The platform supports up to 8-channel DP Audio output.

Regarding HDMI and DP devices, the platform has implemented a jack control feature to detect whether HDMI or DP has been connected to the platform. Therefore, please ensure that the corresponding device is connected to the platform before starting the configuration adaptation.

Complete Route: MEMIF DL10 -> afe_conn_hdmi -> DPTX Interface -> DP device

../../../../_images/sw_rity_app-dev_audio_evk_dp_playback_g1200.svg

DP playback audio data complete route

DP audio playback defaults to using DL10 and is connected to the DPTX interface.

To use DP audio, please ensure that DPTX_OUT_MUX is connected.

amixer -c mt8395evk cset name='DPTX_OUT_MUX' on

PCM Playback

Complete Route: MEMIF DL6 -> Mix Engine -> PCM interface -> PCM pins

../../../../_images/sw_rity_app-dev_audio_evk_pcm_playback_g1200.svg

PCM playback audio data complete route

The PCM playback is a two-channel output. The DL6 memory interface is defaultly connected to I000 and I001.

Please confirm if the components for PCM playback in the Mix Engine have been connected.

amixer -c mt8395evk cset name='O000 I000 Switch' on
amixer -c mt8395evk cset name='O001 I001 Switch' on

The platform has configured GPIO pins for PCM use, and for details on how to connect the hardware, please refer to Raspberry Pi HAT.

Note

Please don’t forget to take out the jumper J43.

Headset Capture

The headset captures audio in mono format, recording the voice from the headset device connected to the Earphone Jack.

Complete Route: Headset -> AU_VIN1 -> PGA Mux -> PGA0 -> ADC0 -> PMIC UL Interface -> Mix Engine -> MEMIF UL4

../../../../_images/sw_rity_app-dev_audio_evk_headset_capture_g1200.svg

Headset capture audio data complete route

The UL4 memory interface is initially connected to O034 and O035, and then the AFE will be connected to the PMIC UL interface.

Please confirm if the components for headset capture in the Mix Engine have been connected.

amixer -c mt8395evk cset name='O034 I168 Switch' on
amixer -c mt8395evk cset name='O035 I169 Switch' on

The PGA_L_Mux controls whether the audio signals input to the PMIC come from the headset or the analog microphone.

To utilize headset capture, you must set the PGA_L_Mux to AIN1.

amixer -c mt8395evk cset name='PGA_L_Mux' 'AIN1'

PGA Gain refers to the hardware gain for capturing audio from the headset and AMIC. To control the volume, you can adjust the PGA1 Volume, which has a range of 0 to 4:

amixer -c mt8395evk cset name='PGA1 Volume' 4

Analog Microphone Capture

On the Genio 1200-EVK, there are three default analog microphones that can record audio in three channels.

Complete Route: mic1 -> AU_VIN0 -> PGA Mux -> PGA0 -> ADC0 -> PMIC Interface -> Mix Engine -> MEMIF UL4

Complete Route: mic2 -> AU_VIN2 -> PGA1 -> ADC1 -> PMIC Interface -> Mix Engine -> MEMIF UL4

Complete Route: mic3 -> AU_VIN3 -> PGA2 -> ADC2 -> PMIC Interface -> Mix Engine -> MEMIF UL4

../../../../_images/sw_rity_app-dev_audio_evk_amic_capture_g1200.svg

Analog Microphone capture audio data complete route

The AMIC and Headset conflict because they both use the same audio data transmission path, so only one of them can be selected for use at a time.

The UL10 memory interface is initially connected to O038, O039 and O182, and then the AFE will be connected to the PMIC UL interface.

Please confirm if the components for AMIC capture in the Mix Engine have been connected.

amixer -c mt8395evk cset name='O038 I168 Switch' on
amixer -c mt8395evk cset name='O039 I169 Switch' on
amixer -c mt8395evk cset name='O182 I170 Switch' on

The default setting for PGA_L_Mux is AIN1 for headset capture. To enable AMIC capture, you should change the PGA_L_Mux setting to AIN0.

amixer -c mt8395evk cset name='PGA_L_Mux' 'AIN0'

You can adjust the PGA1 Volume, PGA2 Volume and PGA3 Volume to control the volume. These mixer controls enable users to adjust the hardware gain of AMIC, which ranges from 0 to 4.

amixer -c mt8395evk cset name='PGA1 Volume' 4
amixer -c mt8395evk cset name='PGA2 Volume' 4
amixer -c mt8395evk cset name='PGA3 Volume' 4

Digital Microphone Capture

The platform by default has two DMICs, so it supports stereo recording.

Complete Route: mic -> DMIC interface -> Mix Engine -> MEMIF UL9

../../../../_images/sw_rity_app-dev_audio_evk_dmic_capture_g1200.svg

Digital Microphone capture audio data complete route

The UL9 memory interface is by default connected to O002 and O003 on the AFE. Please confirm if the components for DMIC capture in the Mix Engine have been connected.

amixer -c mt8395evk cset name='O002 I004 Switch' on
amixer -c mt8395evk cset name='O003 I005 Switch' on

By default, DMIC is set to one-wire mode, where one data pin is connected to two DMIC interfaces. If the user wants to use the two-wire mode, then they need to configure additional settings in the DTS file. For details, you can refer to the DMIC porting guide.

Regarding the volume of DMIC recording, it can be adjusted through the DMIC hardware gain. Please enable the DMIC hardware gain using the following command.

amixer -c mt8395evk cset name='DMIC1_HW_GAIN_EN' on

This is an example of increasing the volume by setting the current gain to 0 dB and then adjusting the target gain to 10 dB.

amixer -c mt8395evk cset name='DMIC1_HW_GAIN_CURRENT' 524288
amixer -c mt8395evk cset name='DMIC1_HW_GAIN_TARGET' 1657944

Please refer to the DMIC porting guide for additional information about DMIC hardware gain.

PCM Capture

The platform supports two channels of PCM audio capture.

Complete Route: PCM pins -> PCM interface -> Mix Engine -> MEMIF UL2

../../../../_images/sw_rity_app-dev_audio_evk_pcm_capture_g1200.svg

PCM capture audio data complete route

By default, PCM capture uses the UL2 memory interface and is connected to O040 and O041 on the AFE. The audio data comes in from the PCM interface and then passes through I002 and I003 into the AFE.

Please confirm whether the components for PCM capture in the Mix Engine have been connected.

amixer -c mt8395evk cset name='O040 I002 Switch' on
amixer -c mt8395evk cset name='O041 I003 Switch' on

The platform has configured GPIO pins for PCM use, and for details on how to connect the hardware, please refer to Raspberry Pi HAT.

Note

Please don’t forget to take out the jumper J43.

HDMI RX

Genio 1200-EVK supports HDMI audio capture.

Complete Route: HDMI Receiver -> HDMI RX interface -> MEMIF UL1

../../../../_images/sw_rity_app-dev_audio_evk_hdmi_capture_g1200.svg

HDMI capture audio data complete route

HDMI RX by default uses the UL1 memory interface(UL6 can also be used to receive HDMI audio data). The incoming audio data format is I2S, which supports up to 8 channels.

Within the HDMI RX interface, it is necessary to configure the MULTI_IN1_MUX to enable the HDMI RX functionality.

amixer -c mt8395evk cset name='MULTI_IN1_MUX' HDMI_RX_I2S