Hardware requirements
Mini/micro USB cable
LPCXpresso55S36 board
Personal Computer
headphones with 3.5 mm stereo jack
source of sound (line output to 3.5 mm stereo jack)
Board settings
Short JP50 1-2,JP53 1-2
Prepare the Demo
Connect headphones to Audio HP / Line-Out connector.
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J1) on the board
Open a serial terminal with the following settings :
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
Headphones will play a sine wave sound. The log below shows example output of the I2S driver demo in the terminal window:
Configure WM8904 codec
Configure I2S
Setup looping playback of sine wave