topic Re: K22 Not Communicating in Kinetis Microcontrollers

K22 Not Communicating

burgeh — Thu, 12 Jul 2018 14:49:24 GMT

I was brought a K22FN256LH12 board that I just got back from production, and when I plug the J-Link Pro in it instantly turns the LED red. I am also unable to communicate using the JLink commander. Below are images of the errors I keep getting. It says the protection bit is enabled it seems, and therefore I allow it to do a mass erase, but then it still cannot communicate with the board. Any thoughts or is this board shot?

Thanks!

Re: K22 Not Communicating

kerryzhou — Fri, 13 Jul 2018 05:22:02 GMT

Hi Christopher,

What's the K22 board you are using now? FRDM-K22?

If yes, please choose the SWD instead of the JTAG, because this board is using the SWD, not the JTAG.

Wish it helps you!

Have a great day,
Kerry

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Re: K22 Not Communicating

burgeh — Mon, 16 Jul 2018 15:42:49 GMT

This is a custom board, but it doesn't communicate through the SWD connector, both JLink and SWD work. I'm wondering if the chip is faulty or if it a board connection. I have a few other produced boards that do work.

Re: K22 Not Communicating

kerryzhou — Wed, 18 Jul 2018 09:25:32 GMT

Hi Christopher,

Now, what's the problem in the custom board? Secure?

If yes, please let our customer check this post:

https://community.nxp.com/servlet/JiveServlet/download/857127-1-396709/Kinetis%20Lock%20issue%20analysis%20and%20unlock%…

This should be the customer board's hardware problem.

Have a great day,
Kerry