Need For Speed Вђ‹вђ‹вђ‹вђ‹most Wanted Hq Descдѓrcaи›i - Jo...

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?

: Progress through the story by defeating 15 rivals, each requiring specific race wins and "Milestones" (objectives achieved during police chases) to unlock.

: A complex heat system dictates police aggression. Higher levels introduce roadblocks, spike strips, and helicopters.

Released in 2005, is a street racing game set in the open world of Rockport City. Players must climb a "Blacklist" of 15 elite racers to reclaim their stolen BMW M3 GTR, all while evading increasingly aggressive police pursuits. Key Gameplay Features

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: Players can upgrade performance and visual components. Visual changes, like body kits and spoilers, are not just for looks; they also impact downforce and speed.

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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.