Bootloader: DFU Start by Flash content instead of Key operation

[Uwe]

Controller: nRF52832-QFAA

Reference project: nRF5_SDK_11.0.0_89a8197/examples/dfu/bootloader/pca10040/dual_bank_ble_s132

Question: The idea is, to store a init_DFU_by_flag into the data flash by the application to initiate the DFU service after RESET. The bootloader has to clear this flag after its recognizing by the erasing of the regarding data page. I guess, the NORDIC-bootloader could use the pstorage raw functions. Exists there a possibility to erase one special data page inside of more than one data page by help of the functions the bootloader uses for the upload of firmware?.

[Uwe]

Many Thanks. But NVIC_SystemReset(); is a software resest, i.e. the softdevice will be kept active and the content of GPREGET-RAM isn't cleared? And a second question: Does the branchingh to the boot loader requires special preparations of the softdevice functions?

[Uwe]

Sorry. Where can I find ble_app_hrm with dfu?

[Hung Bui]

Softreset will resets the softdevice, it's opposite with branching, which keeps the softdevice initialized. You can find the example here: \examples\ble_peripheral\ble_app_hrs\pca10040\s132_with_dfu