trace - logic analyzer

I'm using keil with STLINK, connected to a GD32F130C8.

I can see, in debug, by means of Watch, variables changing in real time.

Everything works fine.

Now I would like to enable trace, in order to see the evolution of a variable in time domain, thru logic analyzer.

I enabled trace flag on trace tab (setting menu), I set, on trace tab, the processor speed (72MHZ).

The problem is that logic analyzer doesn't show requested float variable, and on the bottom of the screen I read the sentence "Trace: No Synchronization".

The output of SystemCoreClock() function gives 72Mhz.

any hint?

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