RE: jump to bootloader from app iuuse

Einar Thorsrud — Mon, 11 Jan 2021 15:38:43 GMT

Hi,

[quote user=""]

NRF_POWER->GPREGRET = 0xB1;

NVIC_SystemReset();

it occur error INVALID MEMORY ACCESS

[/quote]

That is expected when the SoftDevice is enabled. You need to use sd_power_gpregret_set() to write to GPREGRET in that case. This approach should work well.

[quote user=""]

method 2:

use the API : ble_dfu_buttonless_bootloader_start_finalize()

[/quote]

In what way does this fail? It is essentially the same approach as your method 1, but it correctly use the SoftDevice API. Also it uses the power management library, but that might just add complexity if not needed. So your method 1, with the suggested fix is probably the best approach.