Keil Logo

Trace Status

The µVision Status Bar displays trace status messages whenever tracing has been enabled. Additional information is available in the general description of the Status Bar for CPUs that have enabled TrustZone for Armv8-M.

Trace Status Bar

The trace status:

  • Displays progress and error messages when the target processor is running.
  • Refreshes the Running... message every 3 seconds during error-free operations.
  • Is blank, when tracing is stopped without an error.
  • Displays the error message in red when the target stopped with an error.
  • Keeps the error message displayed until tracing is restarted.
Trace Status Description
Communication Error An invalid communication has been detected. Incorrect clock settings or hardware problems cause this message. Applications that change the Core Clock in the main() program may throw this message when data are captured incorrectly. This error message disappears once the Core Clock has been adjusted to the system settings.
HW Buffer Overrun The USB port cannot accept data at the speed the adapter is sending them. Turn off trace events you do not need, or skip PC Sampling.
SW Buffer Overrun Internal SW buffer overrun on the PC. Adjust the SWO Clock Prescaler of the trace port or the Max Clock of the debug port.
No Synchronization Synchronization packets are not received from the target. The trace hardware is either not connected or configured improperly. Help can be found in Configure Cortex-M Devices for Tracing. Hints might be available in the device data sheet.
Data Stream Error Errors are detected in the Trace Data Stream.
Data Overflow The Trace Port was too busy, and not all trace packets could be transmitted. This happens when too many trace data are captured. Decrease the number of trace events.
Running ... The target system itself and tracing operations are running without errors.
<is blank> The target stopped without throwing an error.
  Arm logo
Important information

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies.

Change Settings

Privacy Policy Update

Arm’s Privacy Policy has been updated. By continuing to use our site, you consent to Arm’s Privacy Policy. Please review our Privacy Policy to learn more about our collection, use and transfers
of your data.