Hardware requirements

  • Mini/micro USB cable

  • LPCXpresso55s69 board

  • Personal Computer

  • headphones with 3.5 mm stereo jack

  • source of sound (line output to 3.5 mm stereo jack)

Board settings

Insert the card into the card slot

Prepare the Demo

  1. Connect headphones to Audio HP / Line-Out connector.

  2. Connect source of sound to Audio Line-In connector.

  3. Connect a micro USB cable between the PC host and the CMSIS DAP USB port (P6) on the board

  4. Open a serial terminal with the following settings :

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  5. Download the program to the target board.

  6. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.

Notes

  • MCUXpresso IDE project default debug console is semihost

  • OPUS decoder is disabled due to insufficient memory.

  • The AAC decoder is only supported in MCUXpresso and ARMGCC.

  • When playing FLAC audio files with too small frame size (block size), the audio output may be distorted because the board is not fast enough.

  • When a memory allocation ERROR occurs, it is necessary disable the SSRC element due to insufficient memory.