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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?

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Connect the remaining USB end directly into the computer.

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Open the destination folder. Confirm the presence of the main executable file ( Tester.exe or VagCommander.exe ), configuration initializers ( .ini files), and a dedicated Drivers folder containing FTDI USB serial interface files.

: Find the entry under "Ports (COM & LPT)" or "Other devices" (often labeled "USB Serial Converter" with a yellow question mark). Update Driver Right-click the device and select Update Driver Software "Browse my computer for driver software"

Choose . Click Browse , navigate to the Drivers folder inside your extracted directory, and select it. Click Next to install. Map the COM Port Allocation In Device Manager, expand the Ports (COM & LPT) category. Right-click USB Serial Port and choose Properties .

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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.