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|  How to fix endpoint capture issues with USBlyzer for embedded USB devices?

How to fix endpoint capture issues with USBlyzer for embedded USB devices?

October 14, 2024

Discover effective solutions for firmware developers to resolve endpoint capture issues using USBlyzer on embedded USB devices with step-by-step guidance.

How to fix endpoint capture issues with USBlyzer for embedded USB devices?

 

Understand the Endpoint Capture Issue

 

  • Recognize Symptom Patterns: Often, the first indication of an endpoint capture issue with USBlyzer is incomplete or missing traces in your analysis. Check if specific endpoints fail to appear across multiple captures.
  • Endpoint Configuration Oversight: Without correctly configuring endpoint filters, USBlyzer may skip critical traffic. Check the software documentation to ensure proper configuration.

 

Correcting Filters and Settings

 

  • Adjust Filtering Options: Go to USBlyzer’s filter settings. Make sure you have enabled all the necessary endpoints that the device will use. If you are unsure, try capturing all endpoints to determine which ones are active.
  • Modify Capture Range: USBlyzer might have a default data capture size. If your endpoint data surpasses this size, adjust this parameter using USBlyzer’s settings.
  • Time Synchronization Check: Ensure that your system’s clock is synchronized to prevent timing conflicts affecting capture results.

 

Verification with USBlyzer

 

# Sample Python script for verifying if USB endpoint is configured correctly

import pyusb

def list_devices():
    for bus in pyusb.busses():
        for dev in bus.devices:
            device = dev.open()
            # Attempt to claim the active interface
            try:
                device.setConfiguration()
                trace_device(device)
            except Exception as e:
                print(f"Error claiming interface: {e}")

def trace_device(dev):
    ed = dev.get_active_configuration()[(0, 0)]
    for endpoint in ed.endpoints():
        addr = endpoint.bEndpointAddress

        # Determine endpoint direction: In or Out
        if (addr & pyusb.ENDPOINT_IN):
            print(f"IN Endpoint detected: {addr}")
        else:
            print(f"OUT Endpoint detected: {addr}")

list_devices()

This snippet can be used to ensure that your endpoint configuration indeed matches your expectations and the recorded endpoints.

 

Troubleshoot USBlyzer Output

 

  • Inspect Capture Logs: Analyze USBlyzer’s log files to identify any errors or warnings, which might explain missing captures or data limits.
  • Utilize Verbose Mode: USBlyzer may have a verbose or advanced logging feature. Enable this to get a more detailed trace of USB operations.

 

Hardware and Driver Checks

 

  • Confirm Hardware Connections: Ensure that all physical connections between your embedded device and host are secure. Faulty cables or ports often disrupt endpoint captures.
  • Update Device Drivers: Outdated USB drivers can cause issues with device detection and endpoint capture. Make sure your drivers are up-to-date.

 

Leverage External Tools

 

  • Cross-Verification: Use other USB analyzers to cross-verify USBlyzer results. An alternative tool may help confirm if the issue is software-based.
  • Firmware Debugging Utility: Employ any available debugging utilities specific to your embedded system to see if the endpoint configuration from the device side matches the logs you expect.

 

Document Findings and Adjust

 

  • Maintain a Log of Attempts and Results: Document each step taken during troubleshooting. This log can help identify patterns or provide valuable insight into fixing recurring issues.

Remember, resolving endpoint capture issues often involves a combination of proper configuration, monitoring, and adjustments, coupled with comprehensive debugging and analysis steps.

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