Hi,
We have designed a custom nRF52840 development board based on the XIAO nRF52840 reference schematic. We connected a J-Link debugger to the board and are able to successfully flash the firmware without any errors.
However, after flashing, the board does not function as expected. We are observing the following issues:
1. GPIOs are not toggling (not going HIGH/LOW).
2. The crystal oscillators do not appear to be oscillating.
3. BLE is not advertising or discoverable.
4. The RESET pin measures 3.3 V.
5. The SWDIO pin remains HIGH.
We have attached the complete schematic of our custom development board for your reference.
Could you please review the schematic and help us identify any design issues or mistakes that might be causing this behavior? Please let us know if there are any hardware requirements we may have overlooked.
Any guidance or suggestions would be greatly appreciated.
I have attached the drive link for the PDF: drive.google.com/.../view
Best Regards,
Aditya
