Spartacus_-_laura_surrich_2.mp4 May 2026

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?

The file likely refers to a specific scene from the Starz television series Spartacus: Blood and Sand featuring actress Laura Surrich . In the series, Surrich plays a minor, uncredited role as an unnamed slave (often identified as "Bath Tub Girl") who appears in Episode 6 , "Delicate Things". Character and Context in Spartacus

Laura Surrich's appearance is brief but representative of the series' visual and thematic style. In "Delicate Things," she portrays a domestic slave in the House of Batiatus. : Surrich is credited as "Slave" or " Bath Tub Girl ".

Beyond her appearance in Spartacus , Laura Surrich is an Australian-born actress and model who has appeared in several high-profile productions: Laura Surrich - IMDb

: Though her character is unnamed, her presence highlights the rigid social hierarchy of ancient Capua, where slaves were considered property and often used for the personal comfort of their masters. Career of Laura Surrich

: The series is known for its stylized ultra-violence and sexualized imagery , often using CGI to enhance the Roman aesthetic. Surrich's role contributes to the depiction of the hedonistic and brutal lifestyle of the Roman elite.

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.