Hi
MCUXpresso IDE natively doesn't support Kinetis. We need install related Kinetis SDK to MCUXpresso IDE, it's necessary.
Thus to work with FRDM-KL25 board with MCUXpresso, we need go to this url to download the related SDK, install SDK to IDE.
There are many demo code enclosed under SDK package, you can refer it for your project.
Have a great day,
Jennie Zhang
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------