Overview
========
The maestro_demo application demonstrates audio processing on the ARM cortex core
utilizing the Maestro Audio Framework library.
Depending on target platform there are different features of the demo enabled.
- file decoding and playback
- EAP effects during file playback
The application is controlled by commands from a shell interface using serial console.
Type "help" to see the command list. Similar description will be displayed on serial console:
>> help
"help": List all the registered commands
"exit": Exit program
"version": Display component versions
"file": Perform audio file decode and playback
USAGE: file [start|stop|pause|update|track|list|info]
start Play default (first found) or specified audio track file.
stop Stops actual playback.
pause Pause actual track or resume if already paused.
update=<preset> Apply current EAP parameters without attribute value
or switch to preset 1-10
set=<preset> Apply current EAP parameters without attribute value
or switch to preset 1-10
list List audio files on SD card available for playback
get Sync actual EAP parameters from library to ATT config structures.
track=<filename> Select audio track to play.
list List audio files available on mounted SD card.
info Prints playback info.
EXAMPLE: Playback with eap effect: file track <audio_file> eap 3
Toolchain supported
===================
- IAR embedded Workbench 9.30.1
- GCC ARM Embedded 10.3.1
- MCUXpresso 11.6.0
Hardware requirements
=====================
- Micro USB cable
- JTAG/SWD debugger
- EVKB-IMXRT1050 board
- Personal Computer
- Headphones with 3.5 mm stereo jack
Board settings
==============
Please insert a SDCARD into card slot(J20)
Prepare the Demo
================
1. Connect a micro USB cable between the PC host and the debug USB port (J41) on the board
2. Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. Connect the headphones into the headphone jack on EVKB-MIMXRT1050 board (J12).
5. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Note:
There is limited RAM on this platform, which brings following limitations:
- EAP is enabled just with mp3 files
- to enable opus decoding and playback it is necessary to disable EAP:
1. Undefine EAP_PROC in the project settings
2. Make sure that MAX_SAMPLE_SIZE is defined to 960.
- some of the Opus files might fail to play due to insufficient memory
Running the demo
================
When the example runs successfully, you should see similar output on the serial terminal as below:
**********************************
Maestro audio solutions demo start
**********************************
[APP_SDCARD_Task] start
[APP_Shell_Task] start
SHELL build: Nov 5 2020
Copyright 2020 NXP
>> [APP_SDCARD_Task] SD card drive mounted
Yilin Sun
ded8674389
