MP3 player demo for Alif Gen2 AppKit

A GUI and audio playback demo for Alif products.

The GUI is a slightly modified version of LVGL music player demo, modified files were copied to source/GUI. See libs (git submodules) for the dependencies.

Hardware setup

This demo requires a working Gen2 Appkit with attached display. For audio playback, attach headphones or speakers to the HEADPHONES socket on the board.

Building

The project uses CMAKE for build configuration and GCC or ARMCLang for compilation and linking. The project has several submodules which have to be initiated before building.

Example:

1. git submodule update --init
2. mkdir build_dir
3. cd build_dir
4. cmake -DCMAKE_TOOLCHAIN_FILE=../toolchain-gnu.cmake -DCMAKE_BUILD_TYPE=Release ..
5. make -j

The resulting binary and elf file are located in the bin directory under the build_dir.

Changing core

By default, the project is built to target M55_HP core. HE core can be selected by adding -DENSEMBLE_CORE=M55_HE to the cmake command.

Changing the audio sample

The project expects an MP3 file in stereo format and 48 KHz sample rate. The file is then placed directly into the source code as a buffer and stored to MRAM along with the application.

1. store the audio sample as audio_sample.mp3
2. translate the sample to C header format: xxd -i audio_sample.mp3 > audio_sample.h
3. modify the audio_sample.h:
   • < unsigned char audio_sample_mp3[]
   • > unsigned char const audio_sample_mp3[]
4. modify the audio_sample.c
   • change artist, title, genre and track length
5. rebuild the project

Running the demo

Use either debugger or SEtools to store the image to MRAM. The binary should be placed to start of MRAM ("mramAddress": "0x80000000") and set to be executed on the selected core.