how to manually restart USB device by customer.

RE: how to manually restart USB device by customer.

Priyanka — Thu, 16 Dec 2021 14:46:26 GMT

I am sorry but I don't follow what you say. What I meant previously was that it is not possible to change the HID descriptor on the fly.

-Priyanka

RE: how to manually restart USB device by customer.

William.wei — Thu, 16 Dec 2021 14:17:02 GMT

so we may need how to do this, i tried on uninit api, but failed.

so i submit this ticket if we have any suggestions on this.

Regards,

William.

RE: how to manually restart USB device by customer.

Priyanka — Wed, 15 Dec 2021 15:08:24 GMT

That sounds good.

RE: how to manually restart USB device by customer.

William.wei — Wed, 15 Dec 2021 15:00:49 GMT

Yes PK,

so i guess i need to uninit USB device. and restart it.

Regards,

William.

RE: how to manually restart USB device by customer.

Priyanka — Wed, 15 Dec 2021 09:44:05 GMT

Hi William,

You cannot change the HID descriptor on the run. The OS reads the descriptor at enumeration and stores it for that particular device and if you change the descriptor, you will also need to change the cache/ entries to the OS too. 😞

Regards,

Priyanka

RE: how to manually restart USB device by customer.

William.wei — Tue, 14 Dec 2021 14:53:46 GMT

hi PK,

for some reason, they need to change hid binterval paramter to 3, in our USB hid generic example it is 1;

so customer needs to restart the USB manually, and without restart the MCU, for example by pressing button to restart USB interface, so PC can re-enumerate this USB device, and read the hid descriptor;

i tried app_usb_uninit API, but failed.

Regards,

William.

RE: how to manually restart USB device by customer.

Priyanka — Mon, 13 Dec 2021 11:01:01 GMT

Hi William,

Could you clarify on what you mean by restart manually? And also, in what way do they wish to change the HID descriptor?

Regards,

Priyanka