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FreeRTOS tasks can interrupt USB stack implementation?

Posted by ddudas on September 24, 2015

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


FreeRTOS tasks can interrupt USB stack implementation?

Posted by rtel on September 24, 2015

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?


FreeRTOS tasks can interrupt USB stack implementation?

Posted by ddudas on September 24, 2015

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?


FreeRTOS tasks can interrupt USB stack implementation?

Posted by rtel on September 24, 2015

Sinhala narratives are known for high emotional stakes, often featuring intense dialogue, dramatic music, and long-lasting romantic tensions.

Sinhala relationships and romantic storylines have undergone significant changes over the years, reflecting the evolution of Sri Lankan society and culture. From traditional romances to more complex and mature themes, Sinhala cinema continues to captivate audiences with its engaging storylines and memorable characters. As the industry moves forward, we can expect to see even more innovative and thought-provoking romantic storylines that showcase the diversity and richness of Sri Lankan culture.

Tears welled in Thilini’s eyes. Not from sadness—but from the relief of being understood.

Navigating public displays of affection (PDA) remains a sensitive topic in Sri Lanka. Couples often seek private spaces, like public parks or beach promenades, to spend time together away from societal judgment.

Current storylines in popular cinema and digital series (like those on YouTube) tackle contemporary issues. They explore long-distance relationships


FreeRTOS tasks can interrupt USB stack implementation?

Posted by ddudas on September 24, 2015

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.




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