device initialization problems

RE: device initialization problems

Deep_Bang — Mon, 13 Jun 2022 11:03:20 GMT

so, cant we use both together ?

RE: USB device initialization problems

Jørgen Holmefjord — Thu, 17 Dec 2020 15:28:34 GMT

So if you call nrf_drv_usbd_init() in your application, the app_usbd library will not receive any events from the USBD peripheral, as the driver are only sending the events to the handler you defined in your application. The internal handler in app_usbd will not receive any events, and thus the library will not function correctly.

Similar, if you only call app_usbd_init, the handler in your application where you expect to receive events from the driver will not receive any events.

RE: USB device initialization problems

alexlöddeköpinge — Thu, 17 Dec 2020 12:40:14 GMT

[quote userid="14926" url="~/f/nordic-q-a/69596/usb-device-initialization-problems/285621#285621"]I assumed that you was using the CDC ACM implementation through the app_usbd (USB CDC ACM module), while the custom class device was implemented through the driver directly, but I may have misunderstood you.[/quote]

Yes, I use CDC ACM implementation through the app_usbd and the custom class implementetion through driver directly.

RE: USB device initialization problems

Jørgen Holmefjord — Thu, 17 Dec 2020 12:38:06 GMT

I assumed that you was using the CDC ACM implementation through the app_usbd (USB CDC ACM module), while the custom class device was implemented through the driver directly, but I may have misunderstood you. Is the custom device also implemented through the app_usbd library?

RE: USB device initialization problems

Jørgen Holmefjord — Thu, 17 Dec 2020 12:22:03 GMT

Hi,

app_usbd_init() will internally call nrf_drv_usbd_init() with the library's own event handler. If you call nrf_drv_usbd_init() again outside of the library, the function will return an error code.

If you need to use both, you need to initialize the USBD driver outside of the app_usbd library and pass the events from the driver to the library yourself. I have not tested this, so I cannot comment on how easy it is to achieve and how well it will work. The handler you pass to the app_usbd config is for the library to send events back to the application, it is not related to the handler you pass to the driver, which pass events from the driver back to the application. app_usbd has its own internal handler where it receives events from the USBD driver.

Best regards,
Jørgen