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*Home > Technical Support > FAQs > Development Tool FAQs > Why do I see “External Error: No Interface Initialized” when trying ...
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downarrowWhy do I see “External Error: No Interface Initialized” when trying to connect the Trace Analyser in RVD?
Applies to: RVD Trace, RealView Development Suite (RVDS) 3.1, RealView Trace (RVT)

The ARM RealView Trace (RVT) unit, allows collection of trace (via an external trace port) from ARM processors with an ETM.

When configuring trace in RVD, the first step is to open the Analysis Window and connect the trace analyzer. An example of a successful sequence is shown below:

> analyzer,connect
Initialising Trace Support
Connecting Analyzer to ARM926EJ-S_0 -- ETM Architecture: 1.3.1 Software supplied by: ARM Limited

If no RVT unit is present, or if the RVT unit has failed to initialise correctly, the command will fail with the following error.

> analyzer,connect
Initialising Trace Support
Warning: External Error: No Interface Initialized Error V20017 (Vehicle): Logic Analyzer is not setup. See Output log for details.
Software supplied by: ARM Limited
Error: [TA0027] External Error: No Interface Initialized

It is possible to check whether an RVT unit has initialised correctly by checking the status of the red LED D5. This LED can be found by removing the ventilation grill on top of the RVT unit. Power cycling the RVI unit, should remedy this problem in most cases.






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