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How to compile the source code

  1. Fetch Linux SDK with Yocto and set up environment variables

  2. Execute makefile: make

  3. We can find the folder named deploy_afe under the same directory level of .

What's in the deploy_afe folder

deploy_afe/
├── afe
├── asound.conf_<BOARD> (BOARDS: imx8mm, imx8mp, imx8mp_revb4, imx93)
├── libdummyimpl.so
├── libdummyimpl.so.1.0
└── TODO.md
  • afe: NXP audio front end wrapper
  • asound.conf: Alsa configuration file
  • libdummyimpl.so*: a dummy library for demonstration
  • TODO.md: a user guide

How to integrate with Yocto

  1. Copy all libraries files to /usr/lib/nxp-afe/ in rootfs.

  2. Copy afe, asound.conf_<BOARD>, TODO.md to /unit_tests/nxp-afe/ in rootfs.

Preparation before the test

Here are the dtb and mic hardware needed to prepare before the test:

BOARD: i.MX8MM-EVK

DTB: imx8mm-evk-8mic-revE.dtb / imx8mm-evk-rpmsg-wm8524.dtb / imx8mm-evk-rpmsg-wm8524-lpv.dtb

Mic Hardware: 8mic_board

BOARD: i.MX8MP-EVK

DTB: imx8mp-evk.dtb / imx8mp-evk-rpmsg.dtb / imx8mp-evk-rpmsg-lpv.dtb

Mic Hardware: 8mic_board

(Here if you want to use imx8mp-evk.dtb and your board version is revA3 or later versions but before revB4, please use imx8mp-evk-revA3-8mic-revE.dtb. If your borard version is revB4 or later versions, please refer to BOARD: i.MX8MP-EVK-REVB4)

BOARD: i.MX8MP-EVK-REVB4

DTB: imx8mp-evk-revb4-8mic-revE.dtb / imx8mp-evk-revb4-rpmsg.dtb / imx8mp-evk-revb4-rpmsg-lpv.dtb

Mic Hardware: 8mic_board

BOARD: i.MX93-11x11-EVK

DTB: imx93-11x11-evk.dtb / imx93-11x11-evk-rpmsg.dtb / imx93-11x11-evk-rpmsg-lpv.dtb

Mic Hardware: PDM mic on board

BOARD: i.MX95-19x19-EVK

DTB: imx95-19x19-evk.dtb

Mic Hardware: PDM mic on board

How to execute program

  1. Install aloop module to support afe sudo modprobe snd-aloop

  2. Handle asound.conf You'd better make a backup of /etc/asound.conf in rootfs, and then copy /unit_tests/nxp-afe/asound.conf_<BOARD> to /etc/ to replace the asound.conf file. Take the asound that applies on your board. For example: If you are on and i.MX8MP-EVK the config file is asound.conf_imx8mp. Apart from copying it to /etc/, the name should also be changed like: cp /unit_tests/nxp-afe/asound.conf_imx8mp /etc/asound.conf

  3. cd to /unit_tests/nxp-afe/ execute afe referring to the following command: ./afe libdummy ./afe libdspc ./afe libfraunhofer ./afe libvoiceseekerlight ./afe libconversa

How to test

This chapter explain how to run the diferents libraries the AFE support. For more information please visit the repos of the given libraries/programs.

Firstly, you should put VoiceSpot application (now called voice_ui_app) into operation in the background this step is only required when the VoiceSeekerLight library is used. Secondly, you should put afe program into operation in the background. Thirdly, use aplay tool to playback a piece of audio through speaker. Fourthly, use arecord tool to start record and speak to microphone soon after. Finally, we get the audio with echo cancellation.

dummy library can not realize echo cancellation, because it is only used for demonstration. So you will hear speech mixed with playback music.

Using dummy library

  1. ./afe libdummy &
  2. aplay S32LE16000.wav &
  3. arecord -d10 -fS32_LE -r16000 -c1 dummy_afe_on.wav

Using DSPC library

  1. ./afe libdspc &
  2. aplay S32LE16000.wav &
  3. arecord -d10 -fS32_LE -r16000 -c1 dspc_afe_on.wav

Using Fraunhofer library

  1. ./afe libfraunhofer &
  2. aplay S32LE16000.wav &
  3. arecord -d10 -fFLOAT_LE -r16000 -c1 fraunhofer_afe_on.wav

Using VoiceSeekerLight library with Voicespot

  1. ./voice_ui_app &
  2. ./afe libvoiceseekerlight &
  3. aplay S32LE16000.wav &
  4. arecord -d10 -fS32_LE -r16000 -c1 voiceseeker_afe_on.wav

Using VoiceSeeker library without Voicespot by modifing the Config.ini

  1. ./afe libvoiceseekerlight &
  2. aplay S32LE16000.wav &
  3. arecord -d10 -fS32_LE -r16000 -c1 voiceseeker_afe_on.wav

Using Conversa library

  1. ./UAC_VCOM_composite.sh
  2. ./afe libconversa &
  3. ./afe_uac &
  4. Connect the Conversa Tuning Tool from PC