I clicked 'fill with zero' in Jflash. Bricked the chip?

[nine-fox]

Hi,

By mistake, I clicked 'fill with zero' button in Jflash, may I ask, is my chip bricked because of this? Thanks.

The following lists my steps:

1. program the softdevice 4.0.2 in jflash

2. compile heart sample project in keil and load it

3. use a mobile to test and everything works fine

4. I want to try DFU sample so I followed infocenter to issue command 'nrfjprog --reset --program xx.hex --family NRF52' but it prompts the error I need to erase the chip first

5. not sure what 'erase' mean, so I clicked 'erase chip', 'erase sections', 'fill with zero' in seqence in jflash.

6. I can not connect the chip in Jflash any more. It always display the error: 'Can not connect to the target' even I reconnected several times.

My chip is nrf52832 with sdk 13.0.0 and it is custom board which is the same as PCA10040 except no 32khz rtc provided. Windows 10 Pro, Jlink 5.12c.

Thanks very much.

Vincent

[RK]

no it shouldn't matter at all - you've just filled the flash with zeros - jlink should still connect to the board.

[nine-fox]

Hi @RK thanks for your reply.

Looks like a solder issue I guess. I will re-solder and try again.

Thank you so much

[nine-fox]

Well, it looks like a UICR issue. Since I flashed the DFU example, the UICR is not zero I guess.

By trying several times, this issue is resolved by:

C:\Users\vincent>nrfjprog --recover -f NRF52 Recovering device. This operation might take 30s. Erasing user code and UICR flash areas.

I am not sure why SWD can not connect to my chip if UICR is not cleaned....

DFU sample still does not work - I will try again later