Master Control Panel keeps on Crashing

[Raiyans]

When ever I place my nRF ek dongle and try to run it it just crashes. I'm using MCP 3.9.0 and windows 7. This question has been asked before so I know that some people already had this problem but there were no answers.

Thanks in Advance for the help, Raiyan

[Bjørn Inge]

Hi,
there is a known issue with MCP and IronPython. Do you have IronPyton installed on your computer? If so, try to upgrade IronPython to version 2.7.5. Uninstalling IronPython should also work.

[Paolo D]

I have had the same problem, with Master Control Panel 3.9.0 on Windows 7 (64 bit) and with my own IronPython program using the Master Emulator library. I am using JLink V4.98c that was installed by nRFTools installer 7.5.2.

I have found two different workarounds that work on my laptop. I don't know why these work so I'm not sure if these would work reliably on anyone else's system.

The crash only occurs when the dongle is plugged directly into one of my laptop's USB ports. If it is plugged into a hub then everything works fine.

The other workaround is to disable the J-link driver so that the dongle only appears as a serial port. In Device Manager, find the "J-Link driver" entry under "Universal Serial Bus controllers", right click it, and select Disable. After disabling it, the firmware can't be reflashed. In the 'Select a device' menu of the Master Control Panel the entry for the dongle no longer shows a 9-digit JLink serial number, it only shows a COM port and has to be selected manually. With this workaround, the dongle can be used in the laptop's USB port without using a hub.

[Tim]

Thanks! This worked for me too. For the benefit of others, to select the COM port manually you have to go to File->Options->Serial Port->Show All Devices