nRF51 how to enable readback protection

RE: nRF51 how to enable readback protection

RichieJH — Wed, 27 Sep 2017 15:07:39 GMT

Using nrfjprog command line tools type 'nrfjprog -f nrf51 --recover' to erase the user flash memory and lift the read back protection.

RE: nRF51 how to enable readback protection

endnode — Wed, 27 Sep 2017 15:06:59 GMT

Oh and btw. note that there is quite trivial SWD hack published on the internet showing how to break read-back protection of nRF51 so it's question what hope you put into this mechanism;) Justs another reason to move to nRF52 if you have that option...

RE: nRF51 how to enable readback protection

endnode — Wed, 27 Sep 2017 15:05:03 GMT

I believe both methods suggested by me in that old Q&A are 100% working. What do you mean by incompatibility? I use GCC as well, zero problems with that code sample. When it comes to erasing how exactly do you see that you "cannot erase"? Are you using Nordic tools such as nRFgo studio or NRFJPROG? They have "recover" option which will also erase the entire chip as side effect. Note that read-back protection also disables debugger so that's the reason why certain JTAG/SWD commands stop working... There is a way how to recover the chip without using Nordic tools, there are some hints how to do it in SEGGER J-Flash/J-Link or OpenOCD on this forum, however using Nordic tools it's so smooth that it's almost wasting of time to bother with something else...