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

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

abdelali — Tue, 01 Oct 2019 13:20:21 GMT

😁 yes that's what i think also !

[quote userid="6462" url="~/f/nordic-q-a/52779/program-the-adafruit-nrf52840-with-a-j-link-programmer-using-the-swd-interface/212827"]The only thing to note is that the J-Link on the DK only support 3.3V tagets ...[/quote]

yes , the adafruit boards are 3.3v targets . so it should be fine for our uses !

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

awneil — Tue, 01 Oct 2019 13:13:57 GMT

You can buy a very large number of DKs for the price of one J-Link!

😮

The only thing to note is that the J-Link on the DK only support 3.3V tagets ...

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

abdelali — Tue, 01 Oct 2019 13:01:01 GMT

i still don't have it ! thought getting one. but , i'll try to get a DK instead , it'll be better !

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

awneil — Tue, 01 Oct 2019 13:00:23 GMT

[quote userid="79816" url="~/f/nordic-q-a/52779/program-the-adafruit-nrf52840-with-a-j-link-programmer-using-the-swd-interface/212814"]so getting a DK would be far easier then using these boards[/quote]

I would certainly make for a far easier start.

Once you've gained familiarity & experience, it will be easy to move on.

Note that the J-Link in the DK can be used to program & debug other boards.

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

awneil — Tue, 01 Oct 2019 12:58:21 GMT

[quote userid="83772" url="~/f/nordic-q-a/52779/program-the-adafruit-nrf52840-with-a-j-link-programmer-using-the-swd-interface/212811"]Your JLink[/quote]

abdelali - it's not clear if you already have a J-Link, or were just posting the picture for illustration?

Note that the Nordic DK comes with a built-in J-Link.

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

abdelali — Tue, 01 Oct 2019 12:33:03 GMT

thanks a lot awneil for the clarifications , and the link !

ok, so getting a DK would be far easier then using these boards . we're using this board cause of it's small factor , and it easily fits on our prototype , we also don't need much pins !

ok , i think will try to get a nrf52840 DK , rebuild the firmware test it then flash it to the adafruit nrf52840 board .

thanks again .

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

abdelali — Tue, 01 Oct 2019 12:24:33 GMT

thanks a lot Jayben for the guidelines !

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

Jayben — Tue, 01 Oct 2019 12:22:22 GMT

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/

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

awneil — Tue, 01 Oct 2019 11:58:41 GMT

If the board provides access to the SWD pins, then of course you can.

It probably comes with a Bootloader - so you'd probably want to do a full chip erase first.

[quote userid="79816" url="~/f/nordic-q-a/52779/program-the-adafruit-nrf52840-with-a-j-link-programmer-using-the-swd-interface"]is the development procedures will be same as using a nrf52840 dk[/quote]

It's the same chip. The chip neither knows nor cares what board it is on.

However, you will have to adapt your code to account for the different connections outside the chip.

These questions suggest that you are not very familiar with this?

If so, I would strongly recommend that you start on a Nordic DK - that will be a far easier place to learn & get familiar with the chip and the tools

https://devzone.nordicsemi.com/f/nordic-q-a/52269/my-first-test-with-nrf52840-on-ms04sf7_v1-0-from-minew-dongle/211367#211367

[quote userid="79816" url="~/f/nordic-q-a/52779/program-the-adafruit-nrf52840-with-a-j-link-programmer-using-the-swd-interface"]is that we need an adapter or, for the JTAG to SWD ?[/quote]

The nRF52 have SWD only - not JTAG.

Again, getting a DK will take care of all this for you!

[quote userid="79816" url="~/f/nordic-q-a/52779/program-the-adafruit-nrf52840-with-a-j-link-programmer-using-the-swd-interface"]there is another version that comes with the SWD [/quote]

Version of what?

For details about Adafruit products, you will need to contact Adafruit.