Surpac Error Loading Jvmdll 2021 !!top!! Access

Hi all,

I'm using ST's CubeMX implementation on a F4 discovery board. I use ST's USB middlewares with FreeRTOS.

When I get a special OutputReport from PC side I have to answer nearly immediately (in 10-15 ms). Currently I cannot achieve this timing and it seems my high priority tasks can interrupt the USB callback. What do you think, is it possible? Because it's generated code I'm not sure but can I increase the priority of the USB interrupt (if there is any)?

Thank you, David

10 to 15 ms is very slow, so I'm sure its possible.

Where is the USB callback function called from? If it is an interrupt then it cannot be interrupted by high priority RTOS tasks. Any non interrupt code (whether you are using an RTOS or not) can only run if no interrupts are running.

Without knowing the control flow in your application its hard to know what to suggest. How is the OutputReport communicated to you? By an interrupt, a message from another task, or some other way?

The callback which receive the data from PC is called from the OTGFSIRQHandler (it's the part of the HALPCDIRQHandler function). I think the problem is SysTickHandler's priority is higher than OTGFSIRQHandler and it's cannot be modified, but the scheduler shouldn't interrupt the OTGFSIRQHandler with any task handled by the scheduler. Am I wrong that the scheduler can interrupt the OTGFS_IRQHandler?

: If you can bypass the initial error but experience crashes later, increase the Java Heap Size within Surpac under Customise > Default Preferences > System Options > Java Virtual Machine .

Fix for "Surpac Error Loading JVM.DLL 2021" The "Error loading: jvm.dll" message in GEOVIA Surpac 2021 typically indicates that the software is unable to initialize the Java Virtual Machine (JVM) subsystem required to launch its user interface. This usually stems from missing prerequisites, version mismatches between Surpac and Java, or corrupted configuration files.

: Ensure your system's JAVA_HOME variable points to the correct JRE directory and that the bin folder (e.g., C:\Program Files\Java\jre1.8.0_xx\bin ) is included in your system's Path . Hardware and System Requirements

Restart Surpac to allow it to regenerate clean configuration files.

Use the Dassault Systèmes GEOVIA User Community resources or your original installation media to download the official pre-requisites. :

: Surpac 2021 requires specific libraries to load its Java-based interface.

The error frequently occurs if the software tries to access a 32-bit JDK while requiring a 64-bit one.

If you are running a , you must have a 64-bit Java Runtime Environment (JRE) installed.

Thank you for the answer, I think I'm a bit confused with the Cortex ISR priorities :-) What I can observe is if I use a much higher osDelay in my high priority task I can respond for the received USB message much faster. This is why I think tasks can mess up with my OTG interrupt.