cant detect nrf52 with segger once I flashed the bootloader (sdk11)

[makouda]

I'm trying to flash the bootloader on an nrf52 device. the microcontroller is detected successfully with segger. but then when I flash the bootloader given with sdk11 (dual bank 132) I can no longer detect the nrf52 device with segger. it's really strange because it made this for all the devices I tried.

how can the bootloader brick the nrf52 device? is there somewhere in the bootloader code where SWDIO and SWDCLK are affected? . the device should be detected with segger no matter what's in the flash.

IS SERIAL TRACING ENABLED ON THE BOOTLOADER ????

here the schematic of my board

[Hung Bui]

@makouda: Could you clarify that the broad is bricked now ? Or it still work and you can see it's printing out RTT log ?

Do you see the board in nRFGo Studio when you plug it in ? If you still can see the Segger chip in the list, you can try to use nrfjprog to do a recover :

nrfjprog --recover 

Could you edit the question and attach the bootloader project source ?

[makouda]

Jo Hung, this is what I get tring to run the command above

$ nrfjprog --recover
Recovering device. This operation might take 30s.
ERROR: JLinkARM DLL reported an error. Try again. If error condition
ERROR: persists, run the same command again with argument --log, contact Nordic
ERROR: Semiconductor and provide the generated log.log file to them.

[makouda]

I attached the bootloader project to the question

[makouda]

@Hung also I noticed when I deleted all the ble functions including ble_stack_init the bootloader is always detected

[Hung Bui]

@makouda: I compiled your code and worked fine here, no problem with Jlink , the device advertises. I suggest to test on other board. Also make sure you have powered the chip on the board you are testing (for example if you cut SB9 on the nRF52DK you would need a jumper on P22)