RE: Number of PWR MGMT handlers

Jørgen Holmefjord — Tue, 03 Nov 2020 13:13:24 GMT

Hi,

[quote user="goldwake"]my watch dog is waking my system up after NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF. This doesn't seem like desired behaviour[/quote]

Have you reset the chip after programming, to make sure it does not enter emulated System OFF mode? If the chip successfully enters System OFF mode, it should not be waken up by the Watchdog.

[quote user="goldwake"]Another issue i found is that i can call nrf_pwr_mgmt_shutdown( NRF_PWR_MGMT_SHUTDOWN_CONTINUE) without issues, even if a shutdown hasnt been started with one of the other members of nrf_pwr_mgmt_shutdown_t[/quote]

It looks like this is the intended behavior, the function checks if the procedure is started first:

// Check if shutdown procedure is not started.
if (!nrf_mtx_trylock(&m_sysoff_mtx))
{
    return;
}

The function does not have a return code, so it will not be able to report an error. You should make sure that the logic in your application does not depend on this function unless the shutdown procedure is started.

Best regards,
Jørgen

RE: Number of PWR MGMT handlers

goldwake — Tue, 03 Nov 2020 07:21:40 GMT

ok I made some dumb logic errors prevent this from working properly. It's fixed now but I noticed a couple of things while investigating:

my watch dog is waking my system up after NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF. This doesn't seem like desired behaviour

Another issue i found is that i can call nrf_pwr_mgmt_shutdown( NRF_PWR_MGMT_SHUTDOWN_CONTINUE) without issues, even if a shutdown hasnt been started with one of the other members of nrf_pwr_mgmt_shutdown_t