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Learn how to effectively use the `ClearDTC` interface in AUTOSAR to delete diagnostic trouble codes from your software component.
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How to Clear DTC's Internally in AUTOSAR?

In the realm of automotive software, diagnosing and managing trouble codes is a critical task that engineers often face. Diagnostic Trouble Codes (DTCs) provide insights into the vehicle’s performance and help identify potential issues. However, there comes a time when a developer needs to clear these codes from within their software component (SWC). This guide will guide you through the necessary steps to clear DTCs internally, specifically using the ClearDTC interface in AUTOSAR.

Understanding the DTC Clearing Process

To clear DTCs within the AUTOSAR framework, we rely on the Diagnostic Event Manager (Dem) component, which provides a standardized Client/Server Interface designed for this purpose. The ClearDTC interface comprises two key operations:

ClearDTC: This operation is responsible for clearing the specified diagnostic trouble codes.

SelectDTC: This operation is used to select a specific DTC before performing any operations on it.

Steps to Implement DTC Clearing

To successfully implement the mechanism to clear DTCs internally from the context of your SWC, follow these structured steps:

1. Add Required Operations to Your Project

While working in your authoring tool (note: not Tresos), you must ensure that the ClearDTC operations are included in your project. These operations are generally found in the AUTOSAR blueprints, and you need to make use of them in your software architecture.

2. Create a New R-Port

You will need to add a new R-Port (e.g., rDemClearDTC) equipped with the appropriate PortInterface that corresponds to the ClearDTC functionality.

3. Include Synchronous Server Call Points

Within your runnable entity, add Synchronous Server Call Points (SSCP) for both operations of the ClearDTC interface. This will enable you to interface with these operations properly from your SWC.

4. Implementation of the Calls

Now, it is time to implement the actual calling of these operations over the port you defined. Here’s a simple code snippet illustrating this step:

[[See Video to Reveal this Text or Code Snippet]]

This code demonstrates how to call the defined operations, effectively facilitating the clearing of diagnostic trouble codes from your SWC.

5. Additional Configuration

In some cases, you may also need to configure a second DemClient, as the ClientId required should be part of the Tresos-generated Dem ServiceSwComponent. Pay attention to this configuration to ensure effective communication and functionality.

Important Considerations

The ClearDTC interface is primarily related to ComplexDrivers and is not typically used for standard Application SWCs. This distinction is crucial when planning your implementation strategy.

Reflect on the purpose of invoking ClearDTC from your SWC. It's essential to understand the reasoning behind such an operation in your application’s design.

Conclusion

By following these steps, you can effectively clear DTCs from your automotive software components using the ClearDTC interface. Understanding how to manage DTCs can lead to better diagnostic handling and improved overall vehicle performance. Whether you're debugging or refining functionalities, this guide should help simplify the process.

Feel free to dive deeper into each aspect of the AUTOSAR architecture to leverage the full potential of the framework in your projects!