No Cortex-M Device found in JTAG Chain

[MARTIN FR]

Hello everyone,

I compiled the nrf51-app-button-examples without any error and warnings but it is showing me this error (No cortex -M Device found in JTAG chain / Target DLL has been Cancelled) when i click the download option please help me how to solve this issue and it is working well for blinky exmaples but not for buttons i dont know what is going on over here?

[Wojtek]

You are using nRF51-DK? Go to target options in keil and make sure that you use segger in SW mode instead of JTAG

[MARTIN FR]

in target window i did not found any options like that i found, operating system options, ARM compiler options only

can you please tell me in detail how to check that issue?

[Wojtek]

In keil, go to: "options for target..." -> "Debug" tab -> (right side) "use J-link/j-trace cortex" and click it's "settings" button -> "debug" tab -> set "port" to "SW"

[MARTIN FR]

the programs which i found in nordic examples all are read only so how can i edit them if you know please tell me ?

[Wojtek]

You should be able to change that setting despite of that read-only parameter.