nRF51822 and J-Link Base connections

[Andrew Lentvorski]

I have an nRF51822 design that programs fine from the embedded Segger on the eval board.

However, when I try to connect an actual J-Link Base, I can't seem to get it to recognize the device is even connected in either nRFGo Studio or with J-Link commander.

Do I have to do something screwy because of the lack of a dedicated reset pin? Is there a document somewhere that I missed explaining how to do this?

Thanks.

[Philip Freidin]

Are you trying to use J-Link Base to program a nRF51822 on your own PCB, or the one on the eval board?

If it is the one on the eval board, you will have to disconnect the the embedded Segger. On EK boards V2.0.0, this is done with SW4 and U4. You still have to solder wires to get to SWDIO and SWDCLK, which is pretty tricky.

If this is your own board, then the 4 signals you need are

CPU VCC so J-Link knows what signal levels to use

GND

SWDIO

SWDCLK

[Andrew Lentvorski]

It's my own board. The J-Link Lite that comes with the eval kits programs the board fine.

When I try to use the J-Link Base, it won't even recognize that the device is present.

I was figuring that there are some magic commands needed in J-Link Commander to get things to work.

[Asbjørn]

What drivers have you installed for the J-link base? If the programmer doesn't show up at all, then it must be related to drivers of the l-link base. Do you see the programmer in "Device manager" in windows (if you're using Windows)?

There's shouldn't be any commands you have to write to be able to detect it, but the correct drivers must be installed before you are able to use it to program the nRF51.

[jjww]

I got the same problem. but have not fix it with the above method

[jjww]

The jlink can program with mother board but not my own board.