Hi,

I have a J-Link Pro that might be defective.

I'm working with STM32F427. When I try to connect to the board I get the error "Cannot connect under reset". I've tried it with several of our boards, all with no success.

I'm using the latest version of the Segger drivers, 5.10f, and made sure to update the firmware of the J-Link.

When trying to connect to the boards with J-Link-ARM that I have, all connections are successful.

Any ideas?

Maor

Here's the log file:

J-Link V5.10f Log File
DLL Compiled: Dec 22 2015 14:24:20
Logging started @ 2016-01-04 13:34

T0F5C 000:000 JLINK_SelectUSB(Port = 0) returns 0x00 (0000ms, 0000ms total)
T0F5C 000:000 JLINK_SetEndian(ARM_ENDIAN_LITTLE) returns 0x00 (0000ms, 0000ms total)
T0F5C 000:000 JLINK_ResetPullsTRST(OFF) (0000ms, 0000ms total)
T0F5C 000:000 JLINK_EnableLog(...) (0000ms, 0000ms total)
T0F5C 000:000 JLINK_SetErrorOutHandler(...) (0000ms, 0000ms total)
T0F5C 000:000 JLINK_SetWarnOutHandler(...) (0000ms, 0000ms total)
T0F5C 000:000 JLINK_Open()
Firmware: J-Link Pro V4 compiled Dec 18 2015 17:53:35
Hardware: V4.00
S/N: 174301639
Feature(s): RDI, FlashBP, FlashDL, JFlash, GDB returns O.K. (0269ms, 0269ms total)
T0F5C 000:270 JLINK_ExecCommand("ProjectFile = C:\projects\Spitfire\Embedded\Dev\FEC\FEC2\settings\FEC2_Debug.jlink", ...) returns 0x00 (0006ms, 0275ms total)
T0F5C 000:279 JLINK_ExecCommand("device = STM32F427ZG", ...)Device "STM32F427ZG" selected. returns 0x00 (0006ms, 0282ms total)
T0F5C 000:286 JLINK_GetDLLVersion() returns 51006 (0000ms, 0282ms total)
T0F5C 000:286 JLINK_GetCompileDateTime() (0000ms, 0282ms total)
T0F5C 000:286 JLINK_GetFirmwareString(...) (0000ms, 0282ms total)
T0F5C 000:287 JLINK_TIF_Select(JLINKARM_TIF_SWD) returns 0x00 (0001ms, 0283ms total)
T0F5C 000:288 JLINK_SelectDeviceFamily(14) (0000ms, 0283ms total)
T0F5C 000:288 JLINK_SetSpeed(1000) (0001ms, 0284ms total)
T0F5C 000:289 JLINK_ExecCommand("SetResetType = 0", ...) returns 0x00 (0000ms, 0284ms total)
T0F5C 000:289 JLINK_ExecCommand("SetResetPulseLen = 200", ...) returns 0x14 (0000ms, 0284ms total)
T0F5C 000:289 JLINK_SetResetDelay(0) (0000ms, 0284ms total)
T0F5C 000:289 JLINK_ResetPullsRESET(ON) (0000ms, 0284ms total)
T0F5C 000:289 JLINK_Reset() >0x108 TIF> >0x108 TIF>STM32 (connect): Can not attach to CPU. Trying connect under reset. >0x108 TIF> >0x108 TIF>
***** Error: STM32: Connecting to CPU via connect under reset failed. >0x108 TIF> >0x108 TIF>STM32 (connect): Can not attach to CPU. Trying connect under reset. >0x108 TIF> >0x108 TIF>
***** Error: STM32: Connecting to CPU via connect under reset failed.