I am using NCS v2 and VSCode extension on Windows 11.
I have two pieces of hardware I am testing with:
- Adafruit nRF52840 Feather
- Custom nRF52840 board
When I flash the 'mass' example on the feather, and plug the device into USB, I see a USB Mass Storage Device popup and I can open it from Explorer.
When I flash my custom board, then plug it in to USB, I see a brief flicker on Windows near the tray, but no popup, nothing visible from Explorer.
In PowerShell, as Admin, I run the following command and get output showing "Unknown USB Device (Device Descriptor Request Failed)."
Get-PnpDevice -PresentOnly | Where-Object { $_.InstanceId -match '^USB' }
...
Error USB Unknown USB Device (Device Descriptor Request Failed) USB\VID_0000...
...
So it seems the USB interfacing is at least partly working. Can you help me narrow down what might be going wrong?
I read the datasheet for using the nRF52840 and USB and thought I wired it up correctly.
I route USBD- to USBD-, USBD+ to USBD+, and VBUS to the VBUS_5VDC pin. VBUS also leads to a 3.3v regulator separately. VDDH is tied to VDD. All VBUS/VDD/VDDH are decoupled from ground with a 10uF cap. I do not have an inline resistor on D+ or D-, as I have recently seen in other designs (which notably is not present in the nRF52840-DK).
My prj.conf file is this for the example:
CONFIG_STDOUT_CONSOLE=y #USB related configs CONFIG_USB_DEVICE_STACK=y CONFIG_USB_DEVICE_PRODUCT="Zephyr MSC sample" CONFIG_LOG=y CONFIG_USB_DRIVER_LOG_LEVEL_ERR=y CONFIG_USB_MASS_STORAGE=y CONFIG_USB_DEVICE_LOG_LEVEL_ERR=y CONFIG_USB_MASS_STORAGE_LOG_LEVEL_ERR=y CONFIG_MAIN_STACK_SIZE=1536 CONFIG_HW_STACK_PROTECTION=y CONFIG_USE_SEGGER_RTT=y CONFIG_FAT_FILESYSTEM_ELM=y CONFIG_DISK_DRIVER_RAM=y CONFIG_APP_MSC_STORAGE_RAM=y # CONFIG_APP_MSC_STORAGE_FLASH_FATFS=y
Thanks.
