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Failed on connect: Nn(05). Wire ACK Fault in DAP access.

Question asked by Waldemar Jankowski on Nov 8, 2018
Latest reply on Jan 4, 2020 by Derick Beng Yuh

Hi everyone.


I have a problem with flashing my LPCXpresso 1347, it's suddenly stopped working. I've got a "Wire ACK Fault in DAP access" error. 


Console log:


Executing flash operation 'Program' (Program file into flash: test.axf) - Thu Nov 08 16:19:20 CET 2018
Checking MCU info...
Scanning for targets...
Executing flash action...
MCUXpresso IDE RedlinkMulti Driver v10.2 (Jul 25 2018 11:25:37 - crt_emu_cm_redlink.exe build 555)
( 0) Reading remote configuration
Wc(03). No cache support.
( 5) Remote configuration complete
Reconnected to existing link server
Connecting to probe 2 core 0:0 (using server started externally) gave 'OK'
Probe Firmware: LPC-Link Probe v1.3 (NXP - LPC-Link)
Serial Number: WIN64HS12
VID:PID: 1FC9:0009
USB Path:
connection failed - Nn(05). Wire ACK Fault in DAP access.. Retrying
Failed on connect: Em(19). Communications with DAP fails - is probe connected to a target?
Connected&Reset. Was: NotConnected. DpID: 00000000. CpuID: 00000000. Info: <None>
Last stub error 0: OK
Last sticky error: 0x0 AIndex: 0
No debug bus (MemAp) selected
DAP Speed test unexecuted or failed
Debug protocol: SWD. RTCK: Disabled. Vector catch: Disabled.
(100) Target Connection Failed
Unable to perform operation!
Command failed with exit code 1


How can I fix it?