Kinetis Microcontrollers中的主题 KL25Z to KL26Z migration

KL25Z to KL26Z migration

marcelosousa — Mon, 17 Apr 2017 16:12:09 GMT

I have a working custom board with KL25Z128VLH4. I am planning to move to KL26Z or KL27Z due to the lower price and additional features. I tried to populate the same board with a KL26Z128VLH4, but it doesn't work. It always show the message “Device is secured. Erase to unsecure?” and it never succeeds. I tried both OpenSDA and Ulink2 interfaces, but the results are the same. According to the reference manuals, there is no hardware difference to justify this behavior. Do you have any clues?

Re: KL25Z to KL26Z migration

BlackNight — Mon, 17 Apr 2017 16:35:47 GMT

Hi Marcelo,

in your debugger connection settings, have you specified the KL26Z device?

Erich

Re: KL25Z to KL26Z migration

marcelosousa — Mon, 17 Apr 2017 19:47:38 GMT

Yes, I did. When the "device secure" message is shown and I confirm to unsecure, the following error message appears: "cannot access memory (@ 0xf0002ff0, Read, Acc Size: 4 Byte) ". This address is the Device Id register. So, I can presume it is communicating via SWD properly, but commands are not executed.

Re: KL25Z to KL26Z migration

BlackNight — Tue, 18 Apr 2017 06:09:25 GMT

It looks to me that the connection itself is not reliable. The debugger tries to read the device ID register, but fails. I would check the solder points/etc.

Erich