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

J-Link ARM
FRDM-K22F board
Mini/micro USB cable
Personal Computer

Board settings

No special is needed.

Prepare the Demo

Connect a USB cable between the PC host and the OpenSDA USB port on the board.
Open a serial terminal with these 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 example.

Running the demo

When the example runs successfully, you can see the similar information from the terminal as below.

--- Quick test ---
--- Quick test done ---

--- None-window mode refresh test start---
--- Refresh wdog 1 time ---
--- Refresh wdog 2 time ---
--- Refresh wdog 3 time ---
--- Refresh wdog 4 time ---
--- Refresh wdog 5 time ---
--- Refresh wdog 6 time ---
--- Refresh wdog 7 time ---
--- Refresh wdog 8 time ---
--- Refresh wdog 9 time ---
--- Refresh wdog 10 time ---
--- None-window mode refresh test done ---

--- Window mode refresh test start---
--- Refresh wdog 1 time ---
--- Refresh wdog 2 time ---
--- Refresh wdog 3 time ---
--- Refresh wdog 4 time ---
--- Refresh wdog 5 time ---
--- Refresh wdog 6 time ---
--- Refresh wdog 7 time ---
--- Refresh wdog 8 time ---
--- Refresh wdog 9 time ---
--- Refresh wdog 10 time ---
--- Window mode refresh test done---

End of Wdog example!