Hello Aruino-Community
Im trying to programm my adafruit nRF52840 feather. I created a serial-interface that is continiously reading, actually a pritty simple code. The aim is to send Strings from my computer to the nRF-Chip.
Anyway, every time I upload my sketch, arduino trys to upgrade the target (from port COM6 to COM8). I observe in the device-manager how the serial-port changes for a few seconds from COM6 to COM8, and backwards after a few seconds later. You can hear the windows sound of a disconnected and re-connected device too.
The Error is as following:
“Upgrading target on COM8 with DFU package C:\Users\Padi\AppData\Local\Temp\arduino_build_411245\UART-Read.ino.zip. Flow control is disabled, Single bank, Touch disabled
########################################
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Activating new firmware
Device programmed.
Board at COM6 is not available”
My HP-Laptop is running on Windows 7. I installed the latest version of arduino (1.8.9), installed all new adafruit drivers, bootloaders and libraries for the adafruit nRF52840. I could choose normally the port (COM6) and the weird thing is, that the adafruit nRF52840 feather even receives and runs the code.
The described scenario is shown as a print screen below…
The main reason, why I try to solve this error, is because the switching of the ports interrupts the serial.write-programm from my laptops labview-software. This should run parallel and send the string to the nrf-device, from which the string should be transfered via BLE to another nrf-device.
Its the first time I use Arduino, so its hard to understand why this error happens. I invested already a lot of time to solve it.
Therefore I’m very greatful for any kind of input, advice or solution 
