OTA Automatically Reset and Start the Application After Flashing a Merged Hex File

[Embel_Tech]

Hello Nordic Team,

I am  working on  the nRF52833 using nRF5 SDK 17.1.0 and i  have implemented OTA DFU in our application. in OTA We have merged all firmware into a single HEX file and flashed it to the device. after flashing the merged HEX file. We need to manually reset or power-cycle the hardware for the application to begin running.

Our requirement is for the device to reset automatically through firmware/software after flashing is completed. We do not want to send a reset command manually or perform a hardware   through reset.

I will share the scenario

Generated Bootloader DFU settings .hex file and stored it in: bl_settings.hex

Bootloader DFU Settings:
* File: bl_settings.hex
* Family: nRF52
* Start Address: 0x0007F000
* CRC: 0x41774DEA
* Settings Version: 0x00000002 (2)
* App Version: 0x00000001 (1)
* Bootloader Version: 0x00000001 (1)
* Bank Layout: 0x00000000
* Current Bank: 0x00000000
* Application Size: 0x0000F0E4 (61668 bytes)
* Application CRC: 0xD9F2EDB8
* Bank0 Bank Code: 0x00000001
* Softdevice Size: 0x00000000 (0 bytes)
* Boot Validation CRC: 0xE22406CE
* SD Boot Validation Type: 0x00000000 (0)
* App Boot Validation Type: 0x00000001 (1)

C:\Users\admin>mergehex --merge s140_nrf52_7.2.0_softdevice.hex secure_bootloader_ble_s140_pca10100.hex Echo_UnderDash_II.hex bl_settings.hex --output final_dongle.hex
Parsing input files.
Merging file "s140_nrf52_7.2.0_softdevice.hex" into output.
Merging file "secure_bootloader_ble_s140_pca10100.hex" into output.
Merging file "Echo_UnderDash_II.hex" into output.
Merging file "bl_settings.hex" into output.
Storing merged file.

C:\Users\admin>nrfjprog --eraseall
Erasing user available code and UICR flash areas.
Applying system reset.

C:\Users\admin>nrfjprog --program final_dongle.hex --verify
[ #################### ] 3.035s | Program file - Done programming
[ #################### ] 2.965s | Verify file - Done verifying

i want After flashing, the device should reset automatically and start the application.

We do not want to send a reset command manually or perform a hardware reset. 

We do not want to use the nrfjprog --reset command. The device should automatically reset and start the application through firmware/software after the flashing process is completed, without requiring any manual reset command or hardware reset.

Thanks,

Embel.Tech

[Edvin]

Hello,

By design, the chip is not reset automatically when you program something to it. There are many reasons for this, for example that you may want to program more hex files without a reset in between (e.g. when working with a bootloader, if you reset it after flashing the bootloader, it will create bootloader settings partitions, but you may want to program your own bootloader settings from a hex file before you reset the device).

However, you can attach the argument --reset at the end of your program command, like this:

nrfjprog --program final_dongle.hex --verify --reset

This will program the device, and reset it when it is done verifying the hex file on the target.

Does that work for you?

Best regards,

Edvin