External nRF52840 board appears to flash but won't do anything

Question

I'm attempting to develop for the xiao_ble board in nRF Connect, programming it as an external board using the nRF52840 development kit and the Seeed XIAO expansion board to access the relevant pins. I have the wiring set up like so: 
 
 And it appears to work, I see it programming the flash, verifying, etc, and the XIAO board is no longer recognized by the Arduino IDE so *something* is happening, but I can't get it to even a blink a simple LED; it won't show up as a COM port or do anything it should be doing. Am I missing something? The example I'm trying to start with as a base point is zephyr/samples/basic/blinky

Jared · Accepted Answer

Hi, 
 This is the memory layout from building blinky for my nRF52840 devkit: 
 
 Which is similar to the last one you've shared. 
 ZacMid007 said: his is the blinky build file (zephyr.hex) for the xiao_ble 
 
 Looks like the application expects something else to be flashed at the beginning of flash. Looking at the dts file of the board, it looks like the board expects the softdevice from nRF5SDK to be flashed: 
 
 It seems to me that this board was originally made for the nRF5SDK. Can you clarify whether this is correct with the creators of the board? 
 Also, you can try to build and flash the application to the board without 
 
 CONFIG_BUILD_OUTPUT_UF2 =y 
 CONFIG_USE_DT_CODE_PARTITION =y 
 
 Which are defined in the board config. 
 
 regards 
 Jared

External nRF52840 board appears to flash but won't do anything

Top Replies

core_v2_widget.Hide()