Hardware requirements

  • Mini/micro USB cable

  • EVK-MIMXRT1020 board

  • Personal Computer

Board settings

This example will send data to itself(loopback), and hardware flow control will be enabled in the example.

To make the example work, connections needed to be as follows:

Pin Name  Board Location  connect to  Pin Name  Board Location
  RX        J17-1            			 TX        J17-2  
 RTS_B		J19-1						CTS_B	   j17-8

Prepare the Demo

  1. Connect a USB cable between the host PC and the OpenSDA USB port on the target 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. Either press the reset button on your board or 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 OpenSDA terminal like:


This is LPUART hardware flow control example on one board.
This example will send data to itself and will use hardware flow control to avoid the overflow.
Please make sure you make the correct line connection. Basically, the connection is: 
      LPUART_TX    --     LPUART_RX    
      LPUART_RTS   --     LPUART_CTS  
Data matched! Transfer successfully.

Note: To debug in qspiflash, following steps are needed:

  1. Select the flash target and compile.

  2. Set the SW8: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J23.

  3. Start debugging in IDE.

    • Keil: Click “Download (F8)” to program the image to qspiflash first then clicking “Start/Stop Debug Session (Ctrl+F5)” to start debugging.