UART DFU update of BLE application not working

Question

Hi, 
 I am using the DFU example given in the SDK15.2.0 to try and update the application on my NRF52840. Currently, I have been able to update the application to run the blinky_mbr.hex file given in the secure_dfu_test_images. I works great. However, I wanted to see if I can update the application to run the sample ble_app_blinky example. I placed the corresponding hex file into a zip file and according to the terminal, I was able to download it onto the NRF52840, however, the application is not able to start. If I press Button 4, it goes back into DFU mode. If anyone has any advice on how to go about this, please let me know!

Amanda Hsieh · Answer

Hi, 
 amarin said: I wanted to ask if this makes a difference in how I should be programming the dfu since originally I thought I was just updating the application without a softdevice? 
 From the figure, I think you use the ble_app_blinky_pca10056_s140.hex under nRF5_SDK_15.2.0\examples\ble_peripheral\ble_app_blinky\hex. The one is combined with SD with ble_app_blinky (485KB). If you rebuild the project with ses, you will get the output image also named ble_app_blinky_pca10056_s140.hex under nRF5_SDK_15.2.0\examples\ble_peripheral\ble_app_blinky\pca10056\s140\ses\Output\Release\Exe. The one is without SD and size is small (62KB). 
 If you just want to update the application without the SD, I suggest you rebuild the ble_app_blinky to get the app image without SD. The you could use the following commands to update: 
 nrfjprog --eraseall nrfjprog --program secure_bootloader_uart_mbr_pca10056_debug.hex --verify nrfjprog --program s140_nrf52_6.1.0_softdevice.hex --verify -r 
 nrfutil pkg generate --hw-version 52 --sd-req 0xAE --application-version 1 --key-file private.pem --application ble_app_blinky_pca10056_s140.hex APP.zip nrfutil dfu serial -pkg APP.zip -p COM19 
 -- 
 Note that secure_bootloader_uart_mbr_pca10056_debug.hex is generated by rebuilding pca10056_uart_debug under nRF5_SDK_15.2.0\examples\dfu\secure_bootloader. 
 
 BR, 
 -Amamda

UART DFU update of BLE application not working

Top Replies