Flashing of file does not work without GUI progress bar

[qwasko1212]

I have to develop an application that should operate without any GUI interface. When I am flashing target with a file using jlink.flash_file() it invokes GUI window with progress bar. I am running my application using ssh and I am getting the following exception

JLinkGUIServerExe: cannot connect to X server 
Traceback (most recent call last):
 File "_ctypes/callbacks.c", line 232, in 'calling callback function'
 File "/home/pi/Documents/host/.venv/lib/python3.7/site-packages/pylink/jlink.py", line 323, in <lambda>
   self.detailed_log_handler = lambda s: (detailed_log or logger.debug)(s.decode())
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 25: invalid start byte

This issue also present when I am running an App without a system launcher using raspberry py. Enabling ssh X forwarding is not an option.

I have also tried to supply on_progress callback to jlink.flash_file(), but it still does not prevent for invoking GUI progress bar.

[hkpeprah]

You might want to try the disable_dialog_boxes() method.

[qwasko1212]

This is exactly what I need, but unfortunately, this does not work. I am calling methods as following:

self.jlink.disable_dialog_boxes()  # Disable GUI when flashing
self.jlink.flash_file(file, station.JLINK_FLASH_ADDR, self.on_progress)

However it still creates flashing window. I am using Raspberry OS (Debian).

[kettenbach-it]

Same here

[kettenbach-it]

In jlink.py is says:

pylink/pylink/jlink.py

Line 977 in 1e26587

Dialog boxes only appear on Windows platforms.

That's not the case. Dialogboxes appear on MacOS and Linux as well (unfortunately)

[hkpeprah]

Hey folks, sorry about the above, could you try the following and let me know if any of these work for you. You may need to combine them:

jl = pylink.JLink()

# Hide Device Selection
jl.exec_command('HideDeviceSelection = 1')
jl.exec_command('SuppressControlPanel')

# Hide Flash Windows
jl.exec_command('DisableInfoWinFlashDL')
jl.exec_command('DisableInfoWinFlashBPs')

I think it's fairly new that they appear on *nix platforms.

[kettenbach-it]

Works on MacOS as well as on Linux!
Thanks for the quick fix! (This should make it into the source code as well)

[hkpeprah]

Thanks @kettenbach-it for the quick look into this, and @qwasko1212 for raising it. I've marked this issue as a bug. I can submit a patch for this later today / over the weekend when I have time, but if y'all want to go ahead and submit a patch, I'd be happy to review later today and accept the change. The change would be to the disable_dialog_boxes() method to ensure it disables the flash windows too.

Probably update its docstring too to indicate it's not just Window.

[kettenbach-it]

I'll submit a PR.

Can you have a look at #94 !? That's even more severe that this issue

[hkpeprah]

Fix should be present in v0.10.0 thanks to @kettenbach-it. @qwasko1212, please confirm if this resolves the issue for you.

[kettenbach-it]

Mmm, there still a problem left:

I use "ssh -x" to login to the machine that runs the flash-code. "-x" disables the X-Server, which won't be available in my final production enviroment (docker). Docker ist the reason, why I need this whole thing to be a real shell application not depending on a running x-server.

Using pylink-0.10, flashing with this code works:

    # SuppressControlPanel
    jlink.exec_command("HideDeviceSelection = 1")
    jlink.exec_command("SuppressControlPanel")
    # Hide Flash Windows
    jlink.exec_command("DisableInfoWinFlashDL")
    jlink.exec_command("DisableInfoWinFlashBPs")

    jlink.erase()
    jlink.flash_file(FILE, 0)
    jlink.reset()

But flashing without the "exec_command" statements (lines 1-6), leads to this:

JLinkGUIServerExe: cannot connect to X server
Exception ignored on calling ctypes callback function: <function JLink.__init__.<locals>.<lambda> at 0xb619d070>
Traceback (most recent call last):
  File "/root/duravit-integration-api/venv/lib/python3.9/site-packages/pylink/jlink.py", line 323, in <lambda>
    self.detailed_log_handler = lambda s: (detailed_log or logger.debug)(s.decode())
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 25: invalid start byte

[kettenbach-it]

I narrowed it down to

jlink.exec_command("DisableInfoWinFlashDL")

If this is not present in my program, I get the above error

[qwasko1212]

@kettenbach-it I am using ssh without GUI and jlink.disable_dialog_boxes() disables all GUI windows.
"JLinkGUIServerExe: cannot connect to X server" means that windows were actually created, but it was not possible to show them. Just call jlink.disable_dialog_boxes() before flashing and the problem should be resolved.

P.s I tried to connect using ssh -x and for me everything is fine.

[kettenbach-it]

🤦

[kettenbach-it]

I can confirm: everything is fine now.
This ticket can be clsed

[NazarKostetskiy]

If device is unplugged, using this code:

jlink = JLink()
jlink.exec_command('HideDeviceSelection = 1')
jlink.exec_command('SuppressControlPanel')
jlink.exec_command('DisableInfoWinFlashDL')
jlink.exec_command('DisableInfoWinFlashBPs')
jlink.disable_dialog_boxes()
jlink.open()

I'm getting this error:

JLinkGUIServerExe: cannot connect to X server Traceback (most recent call last): File "_ctypes/callbacks.c", line 232, in 'calling callback function' File "/home/pi/raspberry_web_service/venv/lib/python3.7/site-packages/pylink/jlink.py", line 323, in <lambda> self.detailed_log_handler = lambda s: (detailed_log or logger.debug)(s.decode())

pylink-square==0.10.0

[kettenbach-it]

You didn't do a jlink.open()
Maybe the JLink-Tools want to raise a dialogue-box telling you that no device is open....
Try it with jlink.open() after JLink() and we'll see...

[NazarKostetskiy]

Did with jlink.open() after JLink() . Yep, seems like JLink is trying to raise dialog on open and cannot do that(tried with JLinkExe with Xorg and without Xorg). But I don't need any GUI and I want to disable it. With plugged device everything works fine.

DLL version V6.99c

[hkpeprah]

The documentation seems to be a bit outdated on this, but the situation is as follows:

• .open() takes a serial_no or ip_addr as arguments.
• If ip_addr is specified, it tries to connect over IP.
• If serial_no is specified, it tries to connect to the specific device with the given serial number.
• If serial_no is not specified and ip_addr is not specified, it tries to connect to the first USB emulator device found.

In your case, you have no device plugged in at all, and it is probably raising some error dialog which is why you're running into the issue. Is there a use case for your flow of calling open() with no plugged in device? It should fail, so it's not unexpected that there is some weird issue going on. My suggestion would be to do something like this:

num_emulators = jl.num_connected_emulators()
if num_emulators == 1:
    # There is at least one device we can connect to.
    jl.open()
elif num_emulators > 1:
    raise RuntimeError('Multiple devices found.')
else:
    raise RuntimeError('No devices found.')

[NazarKostetskiy]

The documentation seems to be a bit outdated on this, but the situation is as follows:

• .open() takes a serial_no or ip_addr as arguments.
• If ip_addr is specified, it tries to connect over IP.
• If serial_no is specified, it tries to connect to the specific device with the given serial number.
• If serial_no is not specified and ip_addr is not specified, it tries to connect to the first USB emulator device found.

In your case, you have no device plugged in at all, and it is probably raising some error dialog which is why you're running into the issue. Is there a use case for your flow of calling open() with no plugged in device? It should fail, so it's not unexpected that there is some weird issue going on. My suggestion would be to do something like this:

num_emulators = jl.num_connected_emulators()
if num_emulators == 1:
    # There is at least one device we can connect to.
    jl.open()
elif num_emulators > 1:
    raise RuntimeError('Multiple devices found.')
else:
    raise RuntimeError('No devices found.')

Thanks. Good idea.

[cohen5790]

I am using an Educational (EDU) J-link. I have the disable_dialog_boxes() method and the exec_command() methods in my code, BUT I'm still getting a 'J-Link terms of use' Pop-Up window every time I run a J-link flash or erase method.

I want to disable all J-link GUI and windows to run my code on a headless Raspberry Pi 4. How can I disable this terms-of-service Pop-up?

`def erase_SensorHub():

device = "nRF52840_xxAA"
jlink = pylink.JLink()
jlink.open(serial_no=jlink_serial_no)

jlink.power_on()    
jlink.set_tif(pylink.JLinkInterfaces.SWD)    
jlink.connect(device, verbose=True)

jlink.disable_dialog_boxes()    
# Hide Device Selection
jlink.exec_command('HideDeviceSelection = 1')
jlink.exec_command('SuppressControlPanel')

# Hide Flash Windows
jlink.exec_command('DisableInfoWinFlashDL')
jlink.exec_command('DisableInfoWinFlashBPs')

jlink.erase() 

jlink.reset()
jlink.power_off()
jlink.close()`

[hkpeprah]

@cohen5790, I don't think there is a way to remove that dialog as it's an EDU model.

[cohen5790]

@cohen5790, I don't think there is a way to remove that dialog as it's an EDU model.

Yes, I agree That would make sense for an EDU version.

There is also a method in pylink-square jlink.exec_command('SuppressGUI') that could be helpful for others.

[HelloMrWan]

@cohen5790 thanks，老哥牛逼，This command needs to be executed before each 'open'