Are Seasoned Logs: What

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?

So, what exactly are they? And why do log-burning purists insist on using nothing else? A "seasoned log" is simply a log that has been dried over time to reduce its moisture content. Freshly cut wood (often called "green wood") is alive with sap and water—sometimes up to 80% of its weight. Seasoning is the patient process of letting that water evaporate, leaving behind dry, combustible fuel.

Also, beware of unscrupulous sellers. "Seasoned" is an unregulated term. Always ask, “How long has it been cut and split?” If they hesitate, do the knock test before you buy. Seasoned logs are patience turned into heat. They represent the difference between fighting your fireplace and befriending it. Whether you're heating your home or toasting marshmallows, remember: good fire starts with dry wood. The logs have done their waiting—now it’s your turn to enjoy the glow.

There’s a certain romance to a crackling fire—the dance of the flames, the wave of warmth, the hypnotic pop and hiss. But anyone who has wrestled with a sluggish, smoky fire knows that not all firewood is created equal. The difference between a frustrating fizzle and a roaring success often comes down to two words: seasoned logs.

Experts generally agree that a truly seasoned log has a moisture content below 20%. To understand why seasoning matters, imagine trying to burn a wet sponge. That’s essentially what you’re doing with green wood.

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.