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dual bank DFU is redundancy?

I try  dual bank DFU on nrf52832+SDK15.0.0.

After extract new image to dst_addr(run image_copy),

DFU run nrf_dfu_settings_write().

nrf_dfu_settings_write() is run, nrf_dfu_flash_erase() and nrf_dfu_flash_store().

When  happen 'RESET' between nrf_dfu_flash_erase() and nrf_dfu_flash_store() , DFU setting seem invalid.

Is there a way to avoid this?

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  • Are you building your own custom bootloader? Have you taken a look at the code in the secure_bootloader example in the latest sdk? If you want to do a dual bank dfu, I would take a look at how the example code does the dfu & base your bootloader on that code. The documentation at this link might also be helpful. Dual Bank DFU is mainly used as a fail safe so that if the firmware update fails, you can still boot your old application. If you do a single bank dfu, your old application will be erased. So if the DFU fails in a single bank dfu, you do not have a working application anymore. See the documentation I posted for more info regarding this.

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  • Are you building your own custom bootloader? Have you taken a look at the code in the secure_bootloader example in the latest sdk? If you want to do a dual bank dfu, I would take a look at how the example code does the dfu & base your bootloader on that code. The documentation at this link might also be helpful. Dual Bank DFU is mainly used as a fail safe so that if the firmware update fails, you can still boot your old application. If you do a single bank dfu, your old application will be erased. So if the DFU fails in a single bank dfu, you do not have a working application anymore. See the documentation I posted for more info regarding this.

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