USB not enumerating after reset

RE: USB not enumerating after reset

eblot — Tue, 30 Oct 2018 10:27:24 GMT

I would suggest Nordic Semi not to use "latest" reference in tickets, as it is kind of hard to read a thread a couple of months after it has been written. What "latest" means actually here? SDK 15.0, 15.1, 15.2, 15.x? :-(

RE: USB not enumerating after reset

Andrew Kohlsmith — Wed, 17 Oct 2018 16:01:55 GMT

Perhaps I wasn't clear. I see where the function is defined in the header file. I don't see anything calling that function in the entire SDK. e.g. searching for "nrf_drv_usbd_errata_type_52840_fp1" yields only one result, which is the header file itself.

EDIT: Nevermind, it's called from nrf_drv_usbd_errata_187() in the same file, and that is called by nrf_drv_usbd_enable().

RE: USB not enumerating after reset

Bycman — Wed, 17 Oct 2018 15:20:27 GMT

I am using SDK 15.0.0. The file should exist at this location within the SDK:

components/drivers_nrf/usbd/nrf_drv_usbd_errata.h

RE: USB not enumerating after reset

Andrew Kohlsmith — Wed, 17 Oct 2018 15:02:46 GMT

Where is this function used? I can find no reference to it in the SDK.

RE: USB not enumerating after reset

Bycman — Sat, 26 May 2018 00:21:25 GMT

Yes, that worked. Thank you.

RE: USB not enumerating after reset

Håkon Alseth — Wed, 23 May 2018 14:53:46 GMT

Hi,

Are you using the latest revision of nRF52840?

Unfortunately, we have a bug in our SDK, in file nrf_drv_usbd_errata.h::nrf_drv_usbd_errata_type_52840_fp1().

This has been reported internally, and will be addressed in future versions of the SDK.

static inline bool nrf_drv_usbd_errata_type_52840_fp1(void)

{

return ( nrf_drv_usbd_errata_type_52840() &&

( ((*(uint32_t *)0xF0000FE8) & 0xF0) == 0x20 ) && // note: modified from 0x10 to 0x20!

( ((*(uint32_t *)0xF0000FEC) & 0xF0) == 0x00 ) );

}

The bold highlight shall be 0x20 (not the default 0x10) for applying erratas for engineering C and revision 1 devices.

Could you try this improves the USB enumeration issue?

Kind regards,

Håkon

RE: USB not enumerating after reset

Bycman — Tue, 22 May 2018 21:40:35 GMT

I switched from using the ble_app_uart example to the usbd_ble_uart example, and now USB enumerates fine when resetting back to the bootloader.

Interesting to note that after an update, when the bootloader jumps to the application the application doesn't enumerate USB until I power down and back up. That should be easy to solve. even if I have to do a brute force reset after the update occurs, though I would prefer a more elegant solution.