Disable debug unit with JLink still connected?

RE: Disable debug unit with JLink still connected?

Ole Morten — Tue, 01 Oct 2013 12:44:49 GMT

Take a look at the Makefile.posix attached here. It includes pin-reset target, which as Ulrich says will disable the debug interface.

RE: Disable debug unit with JLink still connected?

Ulrich Myhre — Mon, 30 Sep 2013 13:13:08 GMT

The SWDIO and SWCLK are overlaid on the TMS and TCK pins of the JLink, so there are some JLink DLL APIs that can set the output of these manually. Reproducing the correct sequence with these outputs should produce a PIN reset.

RE: Disable debug unit with JLink still connected?

Chris — Mon, 30 Sep 2013 12:55:31 GMT

I am using something like this in my Makefile:

echo "device nrf51822\nw4 4001e504 2\nw4 40000544 1\nr\nexit\n" > $(OUTPUT_BINARY_DIRECTORY)/pin-reset.jlink

Not sure what you mean by TMS and TCK?

RE: Disable debug unit with JLink still connected?

Ulrich Myhre — Mon, 30 Sep 2013 12:39:12 GMT

I'm on thin ice when it comes to GDB server in general, but take a look at Chapter 10.1.3 of the nRF51 reference manual. Pin-reset, power-on-reset or brown-out reset should all detach the debugger.

nrfjprog just follows the procedure listed in 10.1.3, using the JLink DLL.

Write 0x1 to POWER_RESET register
ClrTMS & ClrTCK
Wait at least 2ms
SetTMS

Hope this helps

RE: Disable debug unit with JLink still connected?

Chris — Mon, 30 Sep 2013 12:37:26 GMT

nrfjprog doesn't run on OSX, that is why I asked about JLink GDB Server. Not sure how nrfjprog actually does the reset, but we might be able to do it with the JLink console.

RE: Disable debug unit with JLink still connected?

Christopher Mason — Mon, 30 Sep 2013 12:34:43 GMT

I should also mention: I'm on a mac. Does the nrfjprog tool use the JLink DLL? Is it open source?

RE: Disable debug unit with JLink still connected?

Chris — Mon, 30 Sep 2013 12:13:17 GMT

Could this be done through JLink GDB server?

RE: Disable debug unit with JLink still connected?

Ulrich Myhre — Mon, 30 Sep 2013 08:58:40 GMT

Hi,

Have you tried doing a PIN-reset by calling "nrfjprog -p"?

This should properly detach the debugger interface and reset the chip.

Regards, Ulrich