Ee(42). Could not connect to core.

[owen_phelan]

Hi there,

I am using the i.MXRT 1050 EVK and MCUXpresso v10.3 to build the standard "hello world" application.

I had previously done this before successfully, but now I am getting an 'Ee(42). Could not connect to core.' message whenever I try to debug any application.

I have been trying for days to fix this. When I got a second chip, the debugging worked for a period and then this error occurred again. Now I have two i.MXRT 1050 EVKs and neither of them are able to debug any application. I have tried unplugging, replugging, rebooting, updating all applications, etc. but to no avail. Can anyone assist me on this matter?

[jeremyzhou · Accepted solution]

Hi Owen Phelan,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
According to the error message, the debugger can't detect the core, I'd like to know whether you change the some jumper's location during the testing or not.
Meanwhile, I'd like to suggest you to try the below tricks to fix the issue.
1. Delete the previous SDK library's demo, then reimport it.
2. Change the Switch SW7 to make the RT1052 boot type become the Serial Downloader prior to debugging.
Please give a try
Have a great day,
TIC

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[owen_phelan]

Hi Jeremy,

Switching the SW7 to the 0010 position, booting up, then switching back to 0110 fixed the issue.

I can now debug applications again.

Many thanks.