jlink problem

[Miroslav]

Hi, My Jlink lite CortexM work with nrf51822 DK boards. But my PCB with nrf51822_xxAA chip can't download code. I'm using ukeil When I chek in utilities Jlink can't recognize SW IDCODE of device. All is set good. PCB is 100% good. Thank you.

[MartinBL]

Hi. As some people have already asked:

• Can you share a diagram of your J-Link <-> PCB connections?
• And what sort of J-Link are you using to program you PCB and nRF51 DK?

In addition:

• Have you installed the latest Segger drivers?
• Are you able to see your device in nRFgo Studio?

And btw, why are you using PCA10001 examples? To ensure proper functionality you should use SDK 6.1.0 or greater and SD 7.1.0 or greater.

[wlgrd]

So, how did you come to that conclusion Miroslav ?

[Miroslav]

Well 12k is placed in datasheet. But from some reason it is not soldered on PCA10001 and working without problem. I first placed serial resistor and got device working on low freq 10kHz. After shortening lines it goes up to 50kHz And by adding 12k on SWDCK it goes to 2MHz :). Maybe I could skip first 2 steps...

[wlgrd]

Thanks, nice to have some explanation for your solution. Glad you made it work! :)