Trace Configuration

The dialog Trace configures the real-time trace operations. This dialog is supported for Cortex-M3 and Cortex-M4 processor-based devices.

Core Clock must be set equal to the CPU clock frequency to receive correct data streams. Some applications start from RESET with a lower CPU Core Clock (for example, devices with on-chip oscillators) and switch to a higher clock in the startup code. For such applications, stop program execution before the clock switches, and modify Core Clock to match the new clock rate. As an alternative, assign the new value to the VTREG CORE_CLK.

Trace Enable activates capturing real-time trace data.

The sections below determine the trace ports and the captured information:

• Trace Port configures the channel used for capturing trace.
• ITM Stimulus Ports activates various ports, which can be used from the program code, to obtain debugging or program-specific information.
• Timestamps sends time information along with trace events.
• PC Sampling enables PC information indicating the program location that triggered a trace event.
• Trace Events report specific CPU events.

Note

• Configuring Devices for Tracing explains the settings for various targets.