NRF52840 Dongle not working properly

[Ceranthor]

Hi,

I have a problem with my nrf dongle i have working example on the DK and i could not put this onto the dongle. I tried dedicated examples and they are not working too. For example ble app blinky the softdevice and the app file were good, device had green light however when i tried to connect via my phone (nrf connect app) it could not connect and the dongle changed its light to red and was not able to detect by nrf connect on PC. Also i could not programm the bootloader (open_bootloader) from examples for PCA 10059. I do not know what to do next. 

[Simonr]

Hi

This "Failed to write" message will occur when you flash using the Dongle in the Programmer app as the Dongle will move into running the application, thus the USB bootloader that communicates with the computer and nRFConnect app. You should see the Dongle (if you flash a BLE app onto it) that it switches from pulsing red to blinking green (indicating that it is advertising). Here's a screenshot of a successful flash of the ble_app_hrs application to an nRF52 Dongle on my end:

Best regards,

Simon

[Ceranthor]

I have another problem. In this program i want to use dongle as BLE UART with CDC. I changed the example. I can access serial port - this works, i can see in nrf connect as uart - this works. In attribute table i see this as Led and button service what is strange i disabled it and there is no functions in my code to enable them.