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i2s_dma_ping_pong_buffer

i2s_dma_ping_pong_buffer#

Overview#

The I2S example project uses one I2S interface to continuously record input sound to a buffer and another I2S interface to playback the buffer to output - digital loopback.

Supported Boards#

MIMXRT685-AUD-EVK
Hardware requirements

  • Micro USB cable

  • MIMXRT685-AUD-EVK board

  • Personal Computer

  • headphones with 3.5 mm stereo jack

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

Board settings
Prepare the Demo

  1. Connect headphones to J4.

  2. Connect source of sound(from PC or Smart phone) to Audio Line-In connector J55.

  3. Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) 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. Launch the debugger in your IDE to begin running the demo.

Running the demo

Note: This demo outputs 1KHZ sine wave audio signal. If the demo running successfully, you will hear the line in audio from line out and terminal window will show:

I2S DMA ping pong buffer demo start
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