Musa Babalu Portable — Brasileirinhas Kid Bengala E

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?

I should consider possible interpretations here. The user might be looking for information on where to download or purchase this content, how to run it, or details about the content itself. They might be encountering technical issues with the portable version. Alternatively, they could be asking for legal sources to access it, especially if it's region-locked or pirated. Also, since it's in Portuguese, they might need help with subtitles or language options.

In summary, the user's query could be about finding, using, or understanding the legal aspects of the Brasileirinhas portable content featuring these two characters. I need to ask for clarification on what exactly they need help with. Are they looking for download sources, technical support, information about the content, or legal advice? Each of these would require a different approach in the response.

I recall that there are some Brazilian content channels or streaming services named Brasileirinhas. They might produce kids' shows or educational content. "Kid Bengala" and "Musa Babalu" could be the names of the shows or the hosts. Since it's marked as PORTABLE, maybe it's a portable DVD player or a software package that can be run on a USB drive, like a portable app.

Another angle is that "Brasileirinhas" is known for producing educational content for children using interactive software. If this is a portable version, it might be designed to run offline, which would be useful for families on the go. The user might need instructions on how to use the software or troubleshoot it. They could also be asking about system requirements or compatibility with different operating systems.

I should check if there are any legal concerns, like whether distributing this content as a portable app violates copyright. The user might be seeking advice on ethical ways to access it. Also, considering the name, it's possible that the content is part of a series or collection, and the user wants to know more about the specific titles involved, like Kid Bengala and Musa Babalu.

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.