DFU serial issue on nrf52832 DK

[User1321]

Hi Nordic, 

I am using the nrf52832 with the Development kit and the 14.2 SDK. 

I have followed the steps in https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.3.0%2Fsdk_app_serial_dfu_bootloader.html  to generate the .zip file and flashing the bootloader with the s132 in the Development hit. 

I see the RTT debug indicating that there is no valid app, that's ok, i have not flashed any app yet. I can also see the LED 3 light up. 

But when i try :   nrfutil dfu serial -pkg app_dfu_package.zip -b 115200 -p /dev/ttyACM1

I always get :

2020-05-25 19:23:51,881 No trigger interface found for device with serial number: XXX
...
NordicSemiException: No ping response after opening COM por

And in the RTT debug i see no output, like it's not even trying to connect. 

My nrfutil version is 5.2.0

Am i missing something obvious?  Any help would be appreciated. 

[Hung Bui]

Hi , 

I assume you were testing with \bootloader_secure_serial _debug version ? 

Please make sure you do a chip erase before testing, the reason is that the start address of the bootloader is stored in UICR and it has to be written with correct address.

When it's running both LED 1 and LED 3 should be lit up. And if you use debug version you should see RTT log. 

I attached here my hex file that worked fine on my computer. 

nrf52832_xxaa_s132.hex

You would need to flash the S132 v5.0 prior to this hex.