This is the documentation for the latest (main) development branch of mcuxpresso sdk. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Hardware requirements

  • Micro USB cable

  • MIMXRT685-AUD-EVK board

  • Personal Computer

Board settings

Make sure the JP42 2-3 is connected.

Using instance 4 of UART interface to transfer data to itself. TX pin is connected with RX pin.

UART4     CONNECTS TO          UART4
Pin Name    Board Location     Pin Name  Board Location
TXD         J27-2               RXD       J27-1

Prepare the Demo

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

Running the demo

When the demo runs successfully, the log would be seen on the terminal like:

USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:

0x 0  0x 1  0x 2  0x 3  0x 4  0x 5  0x 6  0x 7  
0x 8  0x 9  0x a  0x b  0x c  0x d  0x e  0x f  

USART will address itself
USART will send the other piece of data out:

0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17  
0x18  0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f  

USART received data:

0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17  
0x18  0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f  

All data matches!