Tamilyogi Arunachalam Movie Link Direct

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?

Arunachalam listened, palms folded, and for a moment the radio’s music seemed to dip into the room like a tide. He remembered seeing the film decades ago, a print at a provincial cinema where the projector stuttered and the audience laughed in places the movie did not intend. He could have given the boy directions to a streaming site, typed out a search, recited the names of torrent trackers and invitation-only forums—paths that promised ease but led through a thicket of murky responsibility.

Word spread. Neighbors began visiting the bookstore at dusk, not to borrow tapes but to listen. Some asked about actors and producers; others sought the original reel or a place to watch the movie legally. Ramu, pragmatic and warm, took to cataloging the requests and writing polite letters to distributors, trying to find an authorized copy. The community’s hunt shifted from the anonymous search for a link to the patient work of restoration: tracking down a surviving print, raising money for a screening, convincing a local hall to show it with a proper projector.

Months later, the hall filled with folding chairs and the smell of freshly ground coffee. The film played in its whole, flicker and all. People who had only known its fragmented lines in forums now saw the arc, the small gestures that mattered, the silence between two characters that said more than pages of dialogue. After the credits, the applause was soft but steady—like approval for a thing recovered rather than stolen.

The boy who’d first asked for a “link” stayed until the lights came up. He thanked Arunachalam and Ramu for the story, for the search, for guiding the desire from click to care. Arunachalam touched his chin and said, simply, “It was always about sharing, not just finding.”

Instead, Arunachalam told a story.

One afternoon a boy from the neighborhood knocked and asked if he’d seen the latest film everyone whispered about—the one they searched for online with a dozen misspelled names and half-remembered phrases. “Tamilyogi Arunachalam movie link,” the boy stammered, explaining how friends on the message boards had sent fragments: a fight in the rain, a woman standing at a bus stop with a suitcase, a line about a father’s promise. They wanted the link. They wanted to watch the whole thing without the theater’s dust or the censor’s edits.

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.