Hi all,
I'm running into trouble using openocd to flash code onto the nrf52840 and then step through it. I'm running High Sierra (although I doubt that's important), and using a jlink (from segger) as my debug tool. My config file is very simple, and is shown below.
source [find interface/jlink.cfg] transport select swd source [find target/nrf52.cfg]
I know that this works on a Linux machine, but whenever I run it on mine it seems to arbitrarily exit with no error code. The full command is
openocd -f ./openocd.cfg -c "init; \ reset halt; \ sleep 500; \ flash write_image erase build/nrf52840_xxaa.hex; \ reset run; \ shutdown"
(excuse the backslashes - it's from a Makefile). The return that I get is
Open On-Chip Debugger 0.10.0-dev-g90071eb (2017-03-13-12:28)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
adapter speed: 10000 kHz
cortex_m reset_config sysresetreq
Info : No device selected, using first device.
Info : J-Link V10 compiled Apr 20 2018 16:47:09
Info : Hardware version: 10.10
Info : VTarget = 0.000 V
Info : clock speed 10000 kHz
in procedure 'init'
in procedure 'ocd_bouncer'
I've found the same error elsewhere on this site, but it was related to a memory protection bit that needed to be overwritten, and I don't think that's the case here as I tried running nrfjprog --recover and that had no effect, and also it's working fine on linux. Any help would be appreciated. Thank you!
UPDATE 7/12
So it turns out that I was running into a very simple problem; I was using the jlink whereas it was working on the linux machine over the usb plug into the nrf52 devkit, hence the difference in results. However, when I run openocd on my mac with the usb connected to the devkit, I get the output below, with an "invalid subcommand" error on my flash write_image erase. It seems like my install of openocd is missing a few things maybe?
openocd -f ./openocd.cfg -c \ "init; \ reset halt; \ sleep 500; \ flash write_image erase build/nrf52840_xxaa.hex; \ reset run; \ shutdown" Open On-Chip Debugger 0.10.0 Licensed under GNU GPL v2 For bug reports, read http://openocd.org/doc/doxygen/bugs.html adapter speed: 10000 kHz cortex_m reset_config sysresetreq Info : No device selected, using first device. Info : J-Link OB-SAM3U128-V2-NordicSemi compiled Jan 12 2018 16:05:20 Info : Hardware version: 1.00 Info : VTarget = 3.300 V Info : Reduced speed from 10000 kHz to 1000 kHz (maximum). Info : Reduced speed from 10000 kHz to 1000 kHz (maximum). Info : clock speed 10000 kHz Info : SWD DPIDR 0x2ba01477 Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints target halted due to debug-request, current mode: Thread xPSR: 0x01000000 pc: 0x000002e0 msp: 0x20010000 invalid subcommand "write_image erase build/nrf52840_xxaa.hex" in procedure 'flash'
