If you start tracing while a core is running, the sequential configuration of trace components might produce undesired artifacts in the trace stream (e.g. considerable amount of ITM trace before ETM messages start).
Note that ARM Cortex trace does not have a global trace switch that "turns on / off" ITM, ETM etc.
1. Stop CPU(s) via Stop button in the Debug Toolbar.
2. Start trace via Begin New Session button in the Analyzer Toolbar.
3. Run CPU(s) via the Debug Toolbar.
4. Stop trace via Stop the Analyzer Toolbar or stop CPU(s) via Stop in the Debug Toolbar.
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