W4 - Kontrol (official) -

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?

: "Omoge wa gba kontrol" (Girl, come and take control) serves as the primary earworm throughout the track.

: Originally intended as a freestyle, the song features loose, "meme-worthy" lyrics—such as the famous line about being used like a "roll-on" (deodorant)—which helped it go viral. Key Lyrics and Themes

is a landmark Nigerian Afropop single that dominated dance floors and airwaves in the early 2010s. Known for its infectious energy and heavy Fela Kuti influence, the track solidified W4 (born Adewale Adepoju) as a unique force in the Afrobeats scene during his "rebranding" era. Musical Style and Influence

: The track is often cited as an early indicator of the "minimalist" Afropop sound that would later evolve into sub-genres like Afrotrap.

: The singer famously complains, "Girl you dey want to use me like a roll-on," expressing frustration at being used or discarded like a personal care product. Music Video and Legacy W4 – Kontrol Lyrics - Genius

The song revolves around a central theme of reclaiming "control" (Gba Kontrol) over one's space and energy, particularly in the context of a demanding relationship.

: W4 significantly rebranded his image and sound by infusing pop with Fela-esque Afrobeat elements. Critics noted that while the mood and aesthetic borrowed heavily from the late legend, the production by JFem Beats was original, avoiding direct samples.

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.