RE: DFU wakeup the app once a second

Joe — Fri, 24 Apr 2020 17:33:49 GMT

Hi Edvin

I did something similar to what you suggested, I start the pwr_mgmt_timer in app_shutdown_handler() because it doesn't hit the buttonless_dfu_sdh_state_observer( with NRF_SDH_EVT_STATE_DISABLED ). My idle current goes back to before without the 1 second wakeup and the DFU still works.

I need to figure out a way to maintain a special version of nrf_pwr_mgmt.c

Thanks.

RE: DFU wakeup the app once a second

Edvin — Fri, 24 Apr 2020 12:57:17 GMT

Hello,

It looks like the reason for this timer is to allow the device to shut down gracefully when the connected device requests a DFU session.

I assume you didn't have this timer running earlier, since you bring it up. Perhaps you can modify the code to not start the timer in:

power_management_init() -> nrf_pwr_mgmt_init() -> PWR_MGMT_TIMER_CREATE() -> pwr_mgmt_timer_create() -> app_timer_start() (but keep app_timer_create())

But rather start it in the timer in buttonless_dfu_sdh_state_observer(), before the call to:

nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF);

Try it, and check that it doesn't mess up anything in the DFU procedure.

Best regards,

Edvin