'Trace Enable' in CMSIS-DAP debugger not enabled

[yulung]

Hi

I recently acquired a LPC51u68(OM40005) board.  I tried to use printf for debugging in Keil (v.5.38.0.0).  But I found I cannot enable Tracing.  As shown in the screenshot below, the check box of Trace Enable is disabled.  How can I get to enable it?

Thanks.

yulung_0-1674782826206.png

[Alice_Yang]

Hello @yulung 

The required trace interface needs to be supported by both the microcontroller and the debug adapter.

Trace Enable is disabled because your adapter doesn't support this function.

Alice_Yang_1-1675048675283.png

For example I choose ULINKpro , it can enable:

Alice_Yang_0-1675048613370.png

BR

Alice