nRF5340 - DFU over serial mission impossible

Question

Hi, 
 My system is 
 - nRF5340 custom board - Zephyr OS build v2.3.0-rc1-ncs1 - nRF-Connect-SDK v1.2.0 
 
 To perform DFU over UART I was told to merge MCUBoot + mcumgr + smp_srv along with my application (MyApp). Moving some config switches allowed me to 
 
 a) Build and program mcuboot in bootloader partition (using nrjprog over SWD) b) Build and program MyApp (or smp_srv) in slot-0 (using nrjprog over SWD) c) Build and DFU upload MyApp in slot-1 (using mcumgr over UART) d) Confirm slot-1 image (using mcumgr over UART) 
 
 To finish the job I have to re-initiate DFU from within MyApp, passing control to smp_srv again, otherwise all this stuff makes no sense, really. 
 
 Is there an engineer from Nordic who knows how to do it ? 
 
 Best Regards

Gabriele · Answer

Hi, I think I've fixed all major issues. When the application is running the init_uart is executed. The user can instruct the application to set a DFUMODE flag into flash (storage partition, NVS mode). On next reboot the flag state is read (to set the current mode of operation) and then immediately cleared in flash (for next reboot). When in dfu mode, the init_uart is skipped and the smp_srv management calls get executed, allowing mcumgr messages to be parsed and permitting the user to upload-test-confirm new images at will. Thank you for support.

nRF5340 - DFU over serial mission impossible

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