Hi sirs,

we have ARM CORTEX M3 Board of HOLT Incorporation. It consists on board JLink Jtag.

when we are running to debug the code is shows the below(when we run JLink.exe).

C:\Program Files (x86)\SEGGER\JLink_V490b>JLink.exe
SEGGER J-Link Commander V4.90b ('?' for help)
Compiled Aug 14 2014 09:41:15
DLL version V4.90b, compiled Aug 14 2014 09:40:57
Firmware: J-Link ARM-OB SAM7 compiled Jun 1 2012 09:33:42
Hardware: V2.10
S/N: xxxxxxx
VTarget = 3.300V
Info: TotalIRLen = 4, IRPrint = 0x01

****** Error: Error while identifying Cortex-M core.
Info: TotalIRLen = 4, IRPrint = 0x01
No devices found on JTAG chain. Trying to find device on SWD.
Info: Found SWD-DP with ID 0x2BA01477

****** Error: Error while identifying Cortex-M core.
Info: Found SWD-DP with ID 0x2BA01477
No device found on SWD.
Failed to identify target. Trying again with slow (4 kHz) speed.
Info: TotalIRLen = 4, IRPrint = 0x01

****** Error: Error while identifying Cortex-M core.
Info: TotalIRLen = 4, IRPrint = 0x01
No devices found on JTAG chain. Trying to find device on SWD.
Info: Found SWD-DP with ID 0x2BA01477

****** Error: Error while identifying Cortex-M core.
Info: Found SWD-DP with ID 0x2BA01477
No device found on SWD.
No device found at all. Selecting JTAG as default target interface.
J-Link>

It could not identify my cortex m3 core.

when we type 'i' commander it shows

J-Link>i
Info: TotalIRLen = 4, IRPrint = 0x01

****** Error: Error while identifying Cortex-M core.
JTAG Id: 0x00000000: INVALID
J-Link>

JTAGID as 0x00000000 whats it mean?

when we are planed to program the device in atmel studio it shows Unable to entering in programming mode.

please help me why it couldn't identifying Cortex-m3 device.

Thanks in advance.

Hi Alex,

Thanks for your replay. We are using ATSAM3U4E device from ATMEL.

when we type 'i' commander it shows



J-Link>i

Info: TotalIRLen = 4, IRPrint = 0x01



****** Error: Error while identifying Cortex-M core.

JTAG Id: 0x00000000: INVALID

J-Link>



JTAGID as 0x00000000 what is it mean?



when we are planed to program the device in atmel studio it shows Unable to entering in programming mode.



please help me why it couldn't identifying Cortex-m3 device.



Thanks in advance.

Hi Alex,

Thanks for your reply. After Erasing the cortex-m3(ATSAM3U4E) device,it shows everything about the device provided in JLink.exe user manual.

Finally I got the solution.

Hi Alex,



Thanks for your reply. After Erasing the cortex-m3(ATSAM3U4E) device,it
shows everything about the device provided in JLink.exe user manual.



Finally I got the solution.