JFlash to read nRF52832 serial number

RE: JFlash to read nRF52832 serial number

mike1369 — Wed, 06 Nov 2024 07:22:53 GMT

OK, thanks for this
This confirms my thoughts that this is a limitation, unfortunately not documented.

Consider this ticket as Closed ; I will read it using JLink instead

RE: JFlash to read nRF52832 serial number

Michal — Wed, 30 Oct 2024 09:18:52 GMT

I did some tests and I think I know the issue.

J-Flash can only read the memory in the flash section, see for example here: https://forum.segger.com/index.php/Thread/5922-SOLVED-How-can-I-use-jflash-to-read-device-memory-and-save-to-file/

If you look into flash bank for this device in J-Flash, you can also see, that the serial number address is outside the flash bank memory space (as it should be).

So unfortunately, it is a limitation of J-Flash.

Best regards,

Michal

RE: JFlash to read nRF52832 serial number

mike1369 — Wed, 30 Oct 2024 07:18:09 GMT

Yes if I read a flash memory range with :
JFlash.exe -openprj nrf52_dk.jflash -jflashlogC:\tmp\jflash.log -readrange 0x0000060,0x0000067 -exit
that works and I get this log and the data is read:

- Target memory read successfully. (8 bytes, 1 range) - Completed after 0.349 sec
J-Flash V8.10a: Target memory read successfully. (8 bytes, 1 range) - Completed after 0.349 sec

RE: JFlash to read nRF52832 serial number

Michal — Tue, 29 Oct 2024 19:22:21 GMT

Can you read anything else successfully using JFlash?

I think that you may actually want to direct that question to the SEGGER forums.

RE: JFlash to read nRF52832 serial number

mike1369 — Mon, 28 Oct 2024 16:32:46 GMT

Just to confirm that "read successfully. (0 bytes, 0 ranges) " is an issue

I still cannot read the serial number with JFlash

RE: JFlash to read nRF52832 serial number

mike1369 — Fri, 25 Oct 2024 11:57:48 GMT

Yes, sorry, I tried both actually, and made the wrong copy / paste

JFlash.exe -openprj nrf52_dk.jflash -jflashlogC:\tmp\jflash.log -readrange 0x10000060,0x10000067 -exit

gives the following log :

- Connected successfully
- Target memory read successfully. (0 bytes, 0 ranges) - Completed after 0.234 sec
J-Flash V8.10a: Target memory read successfully. (0 bytes, 0 ranges) - Completed after 0.234 sec

RE: JFlash to read nRF52832 serial number

Michal — Fri, 25 Oct 2024 11:29:14 GMT

Hello,

According to the chapter 5.2 of the J-Flash manual: https://www.segger.com/downloads/jlink/um08003

-readrange<SADDR>,<EADDR> | Read specified range of target memory.

You need both the start and end address as the arguments.

Best regards,

Michal