ETB Trace empty on Attach

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    • ETB Trace empty on Attach

      Hi

      I am trying to get Buffered Tracing (ETB) working with Ozone.

      I downloaded the sample project in the KB: kb.segger.com/Tracing_on_Atmel_ATSAME54

      If I flash and debug the sample, it generally works. I can resume and pause, and I see the Instruction Trace.
      But when I disconnect from the target and then at a later point Attach & Halt, the Instruction Trace is empty and does not show any data.
      (I also tried with the Embedded Studio, but here I also did not see valid data, only 0xFFFFFFF0 Addresses)

      Is this behavior expected/correct?
      I thought with ETB, I would be able to connect to a running target and inspect what was written to the trace-buffer while I was not connected with the debugger...

      Regards

    • Hello,

      Thank you for your inquiry.

      The described behaviour is expected. The debugger has to initialize ETB trace to be able to use it. For this a defined system state is needed e.g. after reset or target halt.
      After continuing after such defined system state you should see trace data.

      For such post-mortem analysis that you describe you have to take care of initialization yourself and dump the data in ETB buffer manually as it was not set up through our software so we do not know the trace settings which is required to know to be able to analyze the trace data afterwards.

      Best regards,
      Nino
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