APP_USBD_EVT_POWER_READY is not triggered properly when USB is connected after initizalization

[elwas]

We're using nRF52840 with S140 SoftDevice (version 7.0.1) and 16.0.0 SDK. When USB cable is connected before USB initialization we receive correctly APP_USBD_EVT_POWER_READY event, but when we start our device and later connect USB cable event APP_USBD_EVT_POWER_READY is not triggered. What should we check in our application?

[ketiljo]

The event APP_USBD_EVT_POWER_READY should trigger when you power up the VBUS pin. Is this on a custom board? How do you handle the VBUS pin?

[elwas]

Yes, it is connected to USB connector. Diagrams below.

[Edvin]

Hello,

Let us look at this from a SW point of view, then:

the APP_USBD_EVT_POWER_READY event is generated in app_usbd.c:

        case NRF_DRV_POWER_USB_EVT_READY:
        {
            static const app_usbd_internal_evt_t ev = {
                .type = APP_USBD_EVT_POWER_READY
            };
            app_usbd_event_add(&ev);
            break;

And the NRF_DRV_POWER_USB_EVT_READY is generated if "APP_USBD_CONFIG_POWER_EVENTS_PROCESS" is defined as 1 in sdk_config.h, and USBD_POWER_DETECTION needs to be set to true somewhere in your project, like it is e.g. in the usbd_cdc_acm example project.

So in your project:

1. is APP_USBD_CONFIG_POWER_EVENTS_PROCESS set to 1 in sdk_config.h?

2. is USBD_POWER_DETECTION set to true?

3. is app_usbd_power_events_enable() called? If so, does it return NRF_SUCCESS?

4. is the app_usbd_power_event_handler() in app_usbd.c called with the NRF_DRV_POWER_USB_EVT_READY event?

5. if all of the above is set correctly, is the APP_USBD_EVT_POWER_READY event generated?

Best regards,

Edvin