Reflash nRF52832 through SWD

RE: Reflash nRF52832 through SWD

NicholasC — Fri, 01 Nov 2019 16:34:56 GMT

Seems that the nRF52 wasn't halting some of the time and that was causing my writes to fail. I fixed the issue by replacing 7) with these steps:

1) Write 0x00000001 to DEMCR ARM register.

2) Write 0x05fa0004 to AIRCR ARM register.

3) Poll DHCSR register until we read 0x20000 the S_HALT bit high.

For anyone also having trouble, this basically sets the target up to halt on reset and then resets it then you confirm by seeing S_HALT high.

RE: Reflash nRF52832 through SWD

NicholasC — Thu, 31 Oct 2019 19:20:30 GMT

Update:

I've checked the DP.CTRL/STAT register after I finish trying to flash the chip. The value is the same regardless of if the flash writing was successful or not. There are no sticky error flags high and the RDOK flag is high.

I have also checked the watchdog to make sure it is not running, so I shouldn't be getting a random reset in the middle of programming.

RE: Reflash nRF52832 through SWD

NicholasC — Thu, 31 Oct 2019 14:42:07 GMT

Hi Kenneth,

Thanks for the link; I hadn't seen it. I think that I am following the programming flow laid out in your link, but I'm still having errors on writing.

RE: Reflash nRF52832 through SWD

Kenneth — Thu, 31 Oct 2019 13:48:21 GMT

Have you seen?
https://infocenter.nordicsemi.com/topic/nwp_027/WP/nwp_027/intro.html?cp=12_5

If this doesn't answer your question, then I can check internally.