STLink V3 Error

[JJRR]

Hello, I use the original StLink V3 set, along with STM32CubeProgrammer via cmd. Sometimes I encounter an error where ST-Link jumps into Error: ST-LINK error (DEV_USB_COMM_ERR).I don't know how to resolve it. The only solution that works for me is to disconnect and reconnect the ST link to USB. However, this is problematic if I want it to function reliably in production. Is there any solution?

 

All output:

b' -------------------------------------------------------------------\\r\\n STM32CubeProgrammer v2.13.0 \\r\\n -------------------------------------------------------------------\\r\\n\\r\\n===== DFU Interface =====\\r\\n\\r\\nNo STM32 device in DFU mode connected\\r\\n\\r\\n===== STLink Interface =====\\r\\nST-LINK error (DEV_USB_COMM_ERR)\\r\\n\\r\\n-------- Connected ST-LINK Probes List --------\\r\\n\\r\\nST-Link Probe 0 :\\r\\n ST-LINK SN : \\xf0X\\xe5\\x02\\r\\n ST-LINK FW : \\r\\n Access Port Number : 7471203\\r\\n Board Name : \\r\\n-----------------------------------------------\\r\\n\\r\\n===== UART Interface =====\\r\\n\\r\\nTotal number of serial ports available: 2\\r\\n\\r\\nPort: COM4\\r\\nLocation: \\\\\\\\.\\\\COM4\\r\\nDescription: STMicroelectronics STLink Virtual COM Port\\r\\nManufacturer: STMicroelectronics\\r\\n\\r\\nPort: COM11\\r\\nLocation: \\\\\\\\.\\\\COM11\\r\\nDescription: USB-SERIAL CH340\\r\\nManufacturer: wch.cn\\r\\n\\r\\n

[Peter BENSCH]

In the meantime, there is already a much newer version of the STM32CubeProgr, which you should definitely install to possibly solve your problem. However, I would like to draw your attention to the Terms of Use for ST-LINK/V3SET, which do not permit use in production:

The Evaluation Board shall not be, in any case, directly or indirectly assembled as a part in any production of Yours as it is solely developed to serve evaluation an d testing purposes and has no direct function and is not a finished product. [...]
You shall not use, in whole or in part, the Evaluation Board in a production system.

Hope that helps anyway?

Regards
/Peter

[JJRR]

Hi,

But what else would you recommend for me to use as an alternative to STLink? I know I might use Segger, but I need to use a debugging tool, no components like Asix and such can be utilized in my case.

Thank you.

[AScha.3]

Hi,

Your problem might be hardware related, i had similar problems with st-link V3 .

It catches some glitch or spike over ground connection and gets error, need reconnect.

Try: from [ (mains)plug ->PC -> USB -> st-link -> target <- supply <- (mains)plug  ]

using same mains outlet (+ground) and keep cables for USB to target and mains(+gnd) to target close together,

to keep induced spikes at low level.

Since i did it this way, no more sporadic errors on st-link communication. Try it.

[Uwe Bonnes]

When debug does not work, tripple check wiring, keep wires short and provide sufficient short ground connection. hertz:~> tin -g netnews
Reading config file...

[Uwe Bonnes]

Consider also bad USB cables, hubs or connectors.

[JR2963]

Thank you for all help, but problem remains. There is maybe problem in my code.
The problem almost never occurs when Erasing or Flashing MCU, but sometimes when I write or read from RAM mem. 
Code In Python for writeU32:

 

def writeU32ToMem(self,addr,u32,verify = True):
 with self.swdLock:
 tm = 0.2
 prcs = [self.cubeProgPath+'/STM32_Programmer_CLI.exe',
 '-c',
 'port=SWD',
 'mode=hotplug',
 'freq='+SWD_FREQ,
 #'speed=Reliable',
 '-w32',
 hex(addr),
 hex(u32)
 ]
 if verify == True:
 prcs.append('-v')

 try:
 out = str(subprocess.check_output(prcs, stderr=subprocess.STDOUT, timeout=tm,creationflags=subprocess.CREATE_NO_WINDOW))
 break
 except:
 out = ''

 

 

and Read U32:

 

 

def readU32Mem(self,addr):
 with self.swdLock:
 tm = 1
 
 prcs = [self.cubeProgPath+'/STM32_Programmer_CLI.exe',
 '-c',
 'port=SWD',
 'mode=UR',
 #'speed=Reliable',
 '-r32',
 hex(addr),
 '12',
 ]
 for _ in range(3):
 try:
 out = str(subprocess.check_output(prcs, stderr=subprocess.STDOUT, timeout=tm,creationflags=subprocess.CREATE_NO_WINDOW))
 break
 except:
 out = ''

 try:
 if 'Reading 32-bit memory content' in out:
 hexAddr = "0x{:08X}".format(addr)
 start=out.find(hexAddr+' : ')+len(hexAddr+' : ')
 end = start + 8
 res = out[start:end]
 res=int(res,16)
 
 return res
 except:
 pass

 

Whe try to connect via ST-Utility:

and in STM32Propgramer:

 

 

 

[JJRR]

Solution: use Jlink instead of unreliable ST-Link. It solved this problem