Audio Application for Qualcomm® Robotics RB3 Platform

aplay_test.tar

(found on the Thundercomm Qualcomm Robotics RB3 Development Kit web page, under the Technical Documents tab in the “Sample-apps-codes” section)

Prerequisites:

Complete the build instructions in the Hello RB3 project, and make sure that the following steps are done before proceeding with running the application on device.

1. Setup the development environment

• 1.1) Install Android SDK tools (ADB, Fastboot)
• 1.2) Install and configure the USB driver on host machine
• 1.3) Flash the firmware image on the board
• 1.4) Setup serial port for debugging purpose
• 1.5) Install the App Toolchain SDK

2. Audio Application

• 2.1 From the Thundercomm Qualcomm Robotics RB3 Development Kit web page, under the Technical Documents tab in the “Sample-apps-codes” section, download source code for the Audio application : "aplay_test.tar"

  

• 2.2 After decompressing the .tar file, the directory is as follows:

  $ cd “Path to downloaded source code”
  $ tree alsa-utils-build -L 1
  

  Look for alsa-utils-build.sh file in the downloaded folder

3. Build and transfer the application

• 3.1 Verify the configuration by executing the configuration script and run the same to compile and build the application using makefile.

  $ cat alsa-utils-build.sh

• 3.2 Build the application:

  Load the environment setup for arm7 using ‘source’ command

  $ source /usr/local/oecore-x86_64/environment-setup-aarch64-oe-linux
  $ ./alsa-utils-build.sh
  

• 3.3 Connect the board to the host PC via Type C cable and transfer the application using adb:

  $adb push alsa-utils-build/build/aplay/aplay /usr/bin

4. Verifying Audio Decoding

To verify the audio decoding functionality, download the Audio test files from the Thundercomm Qualcomm Robotics RB3 Development Kit web page, under the Technical Documents tab in the “testResource” section:

Extract the contents to find.wav and .mp3 files

5. Use the following commands to playback the WAV file using amixer + aplay

• 5.1 Push audio:

  $ adb push Audio_Decode_WAV_Stereo_48KHz_16Bit.wav /data/

• 5.2 Enable speaker:

  $ adb shell
  /# spk-ctl enable
  

• 5.3 Play:

  To see the list of audio devices, type the following command:

  /# aplay -L

  Select the required device from the list to play the audio using following command and it will play the audio the device:

  aplay -D front:CARD=C320M,DEV=0 /data/Audio_Decode_WAV_Stereo_48KHz_16Bit.wav
  

To disable speaker

Enter the command: