Erase all including UICR write protection with JLinkExe (JLink Commander)

RE: Erase all including UICR write protection with JLinkExe (JLink Commander)

Raphael — Wed, 02 Mar 2016 13:32:19 GMT

Great, did not know that nrfjprog is now ported. I hope you guys support OS X and alternate toolchains like Eclipse or Embedded Studio much more in the future since so many developers work with Macs nowadays.

RE: Erase all including UICR write protection with JLinkExe (JLink Commander)

Michael Dietz — Mon, 29 Feb 2016 11:01:44 GMT

I highly recommend using our command line tool nrfjprog. brew cask install nrf5x-command-line-tools my favorite nrfjprog command is: nrfjprog --recover // Erases entire chip, UICR, disables any protection, also eraces RAM

RE: Erase all including UICR write protection with JLinkExe (JLink Commander)

Vidar Berg — Mon, 29 Feb 2016 09:51:15 GMT

Hi,

The protection bits are set in the UICR registers which can only be erased by ERASEALL (complete chip erase), see NMVC chapter in nRF51 RM for more details. One reason it was designed this way is that memory protection settings are stored here.

With Jlink commander you have to manually write to NMVC.ERASEALL:

$ w4 4001e504 2  // Enable erase
$ w4 4001e50c 1  // ERASEALL

That said, nrfjprog is now ported to osx. This is a command line tool like J-link commander, but with simplified command line arguments made specifically for the nrf5 series. This will command will for instance perform a full chip erase like the above commands:

$nrfjprog --eraseall / -e

The other advantage with nrfjprog is that it allows you to use the existing flash targets in our SDK Makefiles:

$make flash_softdevice && make flash <target name>  // flashes softdevice and application