nRF52 / GPIOTE / doesn't wake-up properly

[JohnM]

Hello,

My custom board is based on an accelerometer which sends interrupts to nrf52832 to Sleep and Wake-up (pins GPIOTE).

(The FW is based on SDK15\examples\ble_peripheral\ble_app_uart)

The interrupts work ok.

If I upload the FW and connect to my app in nRF Connect then it works ok.

Once the MCU enter it Sleep mode then my app disappears from nRF Connect list ->ok

The problem is,once the system wakes-up, my app appears again in nRF Connect but impossible to connect in nRF Connect!  (it even blocks nRF Connect)

Here what I do to go to Sleep:

    nrf_drv_twi_disable(&m_twi);       //disable TWI for Low power mode
    sd_power_system_off();           //go in Low power mode

It's like this Sleep mode (or Wake-up) is missing something ...

Any idea?

Thanks.

[Bjørn Kvaale]

Have you tried debugging this issue to see what happens when you try to reconnect to nrf connect? Could you upload the log from your nrf52832 & from nrf connect? It could also be useful to check out the power management example from sdk 15 to see if you are waking up from system off correctly. This link could also be helpful.

[JohnM]

Well I came back to the power management example (despite it doesn't implement BLE) and I took "nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF)" instead of "sd_power_system_off()"  and now it works!   (I have to study more in deep why)

thanks.

[Bjørn Kvaale]

Great to hear that you figured it out!