pylink.errors.JLinkException: Unspecified error - during connect()

[darlo-concepcion]

Hi,

I've read the tips regarding unspecified-error-during-connect. I confirmed that I was able to connect to the target with just JLink.exe. As shown below, I tried to dig a little further into pylink by manually executing some of the lines in JLink.connect(). I'm running Python 2.7.13 on a Win11 machine. I was trying to figure out whether there's a compatibility issue but wasn't sure given I couldn't call some functions.

Thanks

Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:42:59) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.

import pylink
j = pylink.JLink()
j.open(serial_no="")
j.product_name
u'SEGGER J-Link'
j.oem
j.opened()
True
j.connected()
True
j.target_connected()
False
j.connect("STM32U585CI")
Traceback (most recent call last):
File "", line 1, in
File "C:\Python27\lib\site-packages\pylink\jlink.py", line 142, in wrapper
return func(self, *args, **kwargs)
File "C:\Python27\lib\site-packages\pylink\jlink.py", line 1138, in connect
raise errors.JLinkException(result)
pylink.errors.JLinkException: Unspecified error.
print(j.get_device_index("STM32U585CI"))
9533
print(j.supported_device(9533))
STM32U585CI <Core Id. 235012351, Manu. ST>
print(j.exec_command('Device = STM32U585CI'))
0
print(j.set_speed(auto=True))
None
print(j._dll.JLINKARM_Connect())
-1
print(j.compile_date)
Apr 17 2024 16:21:58
print(j.version)
7.96e
print(j.compatible_firmware_version)
Traceback (most recent call last):
File "", line 1, in
File "C:\Python27\lib\site-packages\pylink\jlink.py", line 142, in wrapper
return func(self, *args, **kwargs)
File "C:\Python27\lib\site-packages\pylink\jlink.py", line 1232, in compatible_firmware_version
raise errors.JLinkException(res)
pylink.errors.JLinkException: Unspecified error.
print(j.firmware_version.split('compiled')[0])
J-Link V12
print(j.error)
None

[hkpeprah]

I noticed that you didn't call set_speed or set_tif. Is it possible that you intend to connect to the target over SWD, and not JTAG? By default, the target interface will be JTAG, though I think most individuals are using SWD to connect to their ARM MCUs, unless they have GPIOs routed for JTAG instead:

import pylink
j = pylink.JLink()
j.open(serial_no="")
j.set_speed(speed='auto')
j.set_tif(pylink.JLinkInterfaces.SWD)
j.connect("STM32U585CI")

[darlo-concepcion]

Your set_tif() line made it work for me. I was under the mistaken impression that SWD was the default and you needed to do something special for JTAG.

Thanks!