Programme a custom board via USB-C bootloader mode

RE: Programme a custom board via USB-C bootloader mode

Shuhao Dong — Mon, 10 Mar 2025 14:19:28 GMT

Thank you so much.

RE: Programme a custom board via USB-C bootloader mode

Vidar Berg — Mon, 10 Mar 2025 14:14:41 GMT

Hello, yes you are right, the SoCs are blank when they leave the factory, so the initial programming must be done through the SWD interface.

RE: Programme a custom board via USB-C bootloader mode

Shuhao Dong — Mon, 10 Mar 2025 14:11:37 GMT

Hello Vidar, thank you for your reply. I am following this very course at the moment and not realise there is a unit for this. Just a quick follow-up question, do you know if the SoC comes with pre-flashed firmware? If not, is SWD the only choice for the very first programming? Many thanks,

RE: Programme a custom board via USB-C bootloader mode

Vidar Berg — Mon, 10 Mar 2025 13:48:44 GMT

Hello,

There are several ways to do this. You can update the firmware through the main application and remove the need to enter DFU mode first. Or you can enable serial recovery in MCUBoot and perform the update within the bootloader, but then you will need a mechanism to reset into the serial recovery mode first as with the default Thingy53 fw. For more details, please refer to the devacademy course at https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/exercise-4-dfu-over-usb/

Best regards,

Vidar