AnsweredAssumed Answered

problem with segger debugger

Question asked by ZOHAR GOLAN on Dec 8, 2015
Latest reply on Dec 8, 2015 by Marek Neuzil

hi all,


I am trying to debug a custom board using KDS 3.0.0 and a segger j-Link ultra+. The board have a Kinetis mk20dn512 device connected in a jtag chain with altera device.

I don't have an hardware problem since I can use PE-Micro debugger in this configuration, and I also can use the segger debugger on this board if I am using the IDE from IAR.

The problem is when I am trying to open the debugger I am getting the following error log



SEGGER J-Link GDB Server V5.10c Command Line Version




JLinkARM.dll V5.10c (DLL compiled Dec  4 2015 17:25:20)




-----GDB Server start settings-----


GDBInit file:                  none


GDB Server Listening port:     2331


SWO raw output listening port: 2332


Terminal I/O port:             2333


Accept remote connection:      localhost only


Generate logfile:              off


Verify download:               on


Init regs on start:            on


Silent mode:                   off


Single run mode:               on


Target connection timeout:     0 ms


------J-Link related settings------


J-Link Host interface:         USB


J-Link script:                 none


J-Link settings file:          none


------Target related settings------


Target device:                 MK20DN512XXX10


Target interface:              JTAG


Target interface speed:        500kHz


Target endian:                 little




Connecting to J-Link...


J-Link is connected.


Firmware: J-Link Ultra Rev.1 compiled Dec  3 2013 14:27:53


Hardware: V1.00


S/N: 501200180


Feature(s): RDI, FlashBP, FlashDL, JFlash, GDB


Checking target voltage...


Target voltage: 1.79 V


Listening on TCP/IP port 2331


Connecting to target...ERROR: Bad JTAG communication: Write to IR: Expected 0x1, got 0x5 (TAP Command : 10) @ Off 0xF.




ERROR: Could not connect to target.


Target connection failed. GDBServer will be closed...Restoring target state and closing J-Link connection...


Shutting down...



I tried adding the option -jtagconf 0,0 since the kinetis device is the closer to the TDO pin on my board, but I've got the same error


Please advise,

Best regards,