MIMXRT1064-EVK CMSIS-DAP failed on connection

Tomy61410 — Tue, 17 Mar 2026 11:59:13 GMT

I haven't touched the RT1064 development board for three days. Everything was working perfectly three days ago, but after powering it back on from J41 today, I encountered the following problem: it seems the IDE can detect the CMSIS-DAP on the board, but during SWD scanning, it shows that the target core cannot be found and displays a Wire Ack Fault, unable to connect to the chip's debug port.

I have checked the USB connection, unplugged and plugged it in again, and restarted the IDE, but the problem persists. LED D3 is lit, and after the error occurred, LED D20 remains lit red.

How can I resolve this issue?

Thank you for helping me

Tomy

Executing flash operation 'Program' (Program file into flash: Debug\evkmimxrt1064_lwip_dhcp_freertos_RT1064_MicroOCPP.axf) - Tue Mar 17 19:42:17 CST 2026

Checking MCU info...

Scanning for targets...

Executing flash action...

MCUXpresso IDE RedlinkMulti Driver v24.9 (Sep 19 2024 19:34:05 - crt_emu_cm_redlink.exe build 802)

( 0) Reading remote configuration

Wc(03). No cache support.

Found chip XML file in C:/nxp/Workspaces/RT1064/evkmimxrt1064_lwip_dhcp_freertos_RT1064_MicroOCPP/Debug\MIMXRT1064xxxxA.xml

( 5) Remote configuration complete

Reconnected to existing LinkServer process.

Connecting to probe 1 core 0 (using server started externally) reports:

'Ee(42). Could not connect to core.'

Retrying...

Reconnected to existing LinkServer process.

Server OK but no connection to probe 1 core 0 (after 3 attempts) - Ee(42). Could not connect to core.

============= SCRIPT: RT1064_connect.scp =============

RT1064 Connect Script

DpID = 0BD11477

Error: Wire Ack Fault - target connected?

Disabling MPU

Error: Wire Ack Fault - target connected?

Configure FlexRAM for 768KB OC RAM, 128KB I-TCM, 128KB D-TCM

Error: Wire Ack Fault - target connected?

Finished

============= END SCRIPT =============================

Failed on connect: Ee(42). Could not connect to core.

No connection to chip's debug port

(100) Target Operation Failed

Unable to perform operation!

Command failed with exit code 1

Re: MIMXRT1064-EVK CMSIS-DAP failed on connection

EdwinHz — Tue, 17 Mar 2026 22:26:39 GMT

Hi @Tomy61410,

Please try recovering the debug access to your RT by following the steps described on this post: RT board recovery for debugger connect issues. Let me know if the issue persists.

BR,
Edwin.

Re: MIMXRT1064-EVK CMSIS-DAP failed on connection

Tomy61410 — Wed, 25 Mar 2026 08:25:47 GMT

Thank you so much

topic Re: MIMXRT1064-EVK CMSIS-DAP failed on connection in i.MX RT Crossover MCUs

MIMXRT1064-EVK CMSIS-DAP failed on connection

Re: MIMXRT1064-EVK CMSIS-DAP failed on connection

Re: MIMXRT1064-EVK CMSIS-DAP failed on connection