Cannot connect to nRF51-Dongle using JLinkExe

[jiadong]

Hi,

I am working on a school project, and I need to use a nRF51 dongle as a BLE master. However, when I try to use JLinkExe to connect to the dongle, it fails all the time. The console output as shown in the attached image.

Thanks in advance.

[Dan Danknick]

Switch over to the SWD interface from JTAG. That will very likely solve your problem and let you see the nRF51 dongle.

[jiadong]

Hi Dan,

Thank you for your answer and it works. But when I use the "TestCSpeed" command, it returns that "No RAM available @ address 0x0. Could not determine CPU clock". What is the issue with that?

Thank you again. :-)