nrf52840 dongle can't send firmware with nrf-connect desktop

[Doroana]

I have already pressed reset in the dongle, it was pulsing red. And when I write it allways says the same error.
I have done this experiment in Ubuntu 16.04 and Windows 10 and I got the same error.

Thx for your help.

PS: It is my first time working with a dongle... so it is possible that I have done some obvious errors.

[Vidar Berg]

Hi,

It sounds like you have done everything correctly. The LED will pulse red when the bootloader is running in DFU mode, and the errors you got can show up even after a successful FW because the programmer app will not recognize the dongle unless the upload app includes the USB DFU trigger mechanism (most apps won't enable the USB interface at all).  

I suggest to try DFU with the blinky .hex below to verify that DFU is working on your setup. Both the RGB and green LED should start blinking if the upload was successful. 

blinky_pca10059_mbr.hex

[Doroana]

Hello,

Altough it worked I noticed that the dongle is not able to connect again with the PC unless I reset it.
Probably that is because the blinky.hex is missing the USB DFU trigger. I would lik to incorportate that feature in to my program but I can't find where to learn it, could you point me a site to learn how to implement it?

[Vidar Berg]

Hello, 

DFU USB trigger is implemented in the connectivity example (nRF5_SDK_15.2.0_9412b96\examples\connectivity\ble_connectivity\pca10059) and  documentation for the module can be found here: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_dfu_trigger_usb.html?cp=4_0_0_3_5_3. Hope this helps.