Hardware requirements

• Micro USB cable

• EVK-MIMXRT685 board

• Personal Computer

• headphones with 3.5 mm stereo jack

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

Board settings

To make example work, connections needed to be as follows: JP7-1 <–> JP7-2 JP8-1 <–> JP8-2

Prepare the Demo

1. Connect headphones to Audio HP / Line-Out connector (J4).

2. Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) on the board

3. Open a serial terminal with the following settings:

   • 115200 baud rate

   • 8 data bits

   • No parity

   • One stop bit

   • No flow control

4. Download the program to the target board.

5. Launch the debugger in your IDE to begin running the demo.

Running the demo

Headphones will play a sine wave sound. This demo outputs 450HZ sine wave audio signal. The log below shows example output of the I2S driver demo in the terminal window:

Configure codec
Configure I2S
Setup looping playback of sine wave