NRF51 SWD flashing

RE: NRF51 SWD flashing

Stian Røed Hafskjold — Fri, 28 Oct 2016 15:56:49 GMT

Again, what hardware/software are you using? Are you developing your own debugger? Then you should check out ARM documentation. infocenter.arm.com/.../index.jsp, infocenter.arm.com/.../index.html. And this whitepaper on production programming: infocenter.nordicsemi.com/.../intro.html. You need to access the DAP to halt the processor.

To reset the chip you can write 0x05FA0004 to address 0xE000ED0C

RE: NRF51 SWD flashing

VoidGreen — Thu, 27 Oct 2016 16:26:30 GMT

I found the reason for that bug. |It looks like if WF uses NVMC and it conflicts with SWD flashing through NVMC. So another question is how to stop and maybe reset execution of FW code through SWD?

RE: NRF51 SWD flashing

Stian Røed Hafskjold — Tue, 25 Oct 2016 14:14:34 GMT

So what are you using to flash the chip? And which software? I've never seen that with a JLink. You could try to do a pin reset after flashing, set the 0x40000544 register to 1, and then hold SWDIO and SWDCLK low for a minimum of 100µs.