Wake on VBUS connected but not disconnectedW

[Constantin]

Hi,

we are developing a device which should go to system off on receival of a command either via USB or BLE. If the device is connected via USB and is put into sleep it wakes up if the cable is disconnected. But it should stay in system off. Any idea why this happens and how to avoid it.

Kind regards,

C.W.

[Constantin]

Do you have any hint regarding my last comment?

[Vidar Berg]

I don't have any good explanations as to why the RESETREAS is set with an invalid bit. This only happens when you are clearing the bits from your app?

[Constantin]

Okay but I would say that the code is correct

    // reset areas

    static uint32_ reset_reas = 0x00000000;
    sd_power_reset_reason_get(&reset_reas);
    sd_power_reset_reason_clr(0x000F000F);
    NRF_LOG_ERROR("Reset reason %x", reset_reas);

Because it behaves correct when I do a reset via the debugger. It gives 0x4 which means SREQ which is correct. But if I pull the USB cable it gives 0x100000. Which is protected.

[Vidar Berg]

Bit 20 corresponds to VBUS: