program the adafruit nrf52840 with a j-link programmer using the SWD interface

[abdelali]

hi,

is it possible to use a j-link programmer like this one in the photo, to program the adafruit nrf52840 board ? is the development procedures will be same as using a nrf52840 dk ?

will also use the SES IDE for that !

- if so,  is that we need an adapter or, for the JTAG to SWD ? or there is another version that comes with the SWD ?

please kindly guide !

[Jayben]

Your board has the standard 10-way 0.05" pitch Cortex Debug Connector, see http://infocenter.arm.com/help/topic/com.arm.doc.faqs/attached/13634/cortex_debug_connectors.pdf

Your JLink should work fine, but unfortunately it has a 20-way 0.1" pitch connector (see 'legacy connector' in that document), so you'll need an adaptor between the two.

If you don't have one of those, either trawl the Internet, or make one yourself - the easiest way to do that is to get ribbon cables for the two connectors (a 0.05" pitch 10-way to 10-way, and 0.1" pitch 20-way to 20-way), chop both in half, then solder the necessary wires together; you'll need to heatshrink the connections for mechanical strength. The only signlas you need are SWDCLK, SWDIO, 3.3V supply, and ground.

To learn more about SWD on the NRF52 (albeit using OpenOCD), see https://iosoft.blog/arm-gcc-lean-nordic-nrf52/

[abdelali]

thanks a lot Jayben for the guidelines !