Hi There,
I am now having problmes getting a custom desing to connect with the MK20DN128VFM5. I finally figured out an unconnecting SWD issue on a previous custom K22F board that I thought I might be having the same issue on - not the case. Previously the problem was the NMI triggering interrupts which would not allow SWD connection (k22f - no longer connects to SWD ) - reference: k22f - no longer connects to SWD .
Based upon the reference manual section 6.3.4 the only pins that would conflict with the SWD connection process are the NMI/EZ_PORT_CS(PTA4) and the reset pins. However, I have ensured the that PTA4 is held high during the boot process, observed the reset pin coming high after power on and SWD will not connect.
Questions:
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Hi Ma,
Thank you for confirming that you have a 1n86B version running on your fdm-k22F board. I have re-soldered a 1n86B chip onto the freedom board and it is connecting to SWD on my side as well. I have found that our custom footprint could be improved for better soldering repeatability. I have gotten the 1n86B chips working on our custom prototype boards as well after reworking the boards a few times for proper soldering connections.
It appears I led us on a bit of a goose chase based upon some bad soldering from the beginning. I will see if I can re-label the topic to better reflect the problem.
Thanks for the support!
Hi M J,
I have a FRDM-K20D50M board on hand, which with a K20 50MHz mask set: 1N86B on board.
I can use J-Link with SWD to debug this board.
So, I think the mask set 1N86B is not the root cause.
I would recommend customer to refer FRDM-K20D50M schematics about SWD interface design.
And which debugger tool customer is using? Segger J-Link or P&E Multilink Universal?
Thank you for the attention.
IAR debugger setting:
Have a great day,
Ma Hui
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Hi Ma,
Thank you for confirming that you have a 1n86B version running on your fdm-k22F board. I have re-soldered a 1n86B chip onto the freedom board and it is connecting to SWD on my side as well. I have found that our custom footprint could be improved for better soldering repeatability. I have gotten the 1n86B chips working on our custom prototype boards as well after reworking the boards a few times for proper soldering connections.
It appears I led us on a bit of a goose chase based upon some bad soldering from the beginning. I will see if I can re-label the topic to better reflect the problem.
Thanks for the support!