FreeRTOS Support Archive
The FreeRTOS support forum is used to obtain active support directly from Real
Time Engineers Ltd. In return for using our top quality software and services for
free, we request you play fair and do your bit to help others too! Sign up
to receive notifications of new support topics then help where you can.
This is a read only archive of threads posted to the FreeRTOS support forum.
The archive is updated every week, so will not always contain the very latest posts.
Use these archive pages to search previous posts. Use the Live FreeRTOS Forum
link to reply to a post, or start a new support thread.
[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [September 2015 Threads]
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?
If a code requires you to download a file from MediaFire, Mega, or Telegram—it is not legitimate.
O Presto é uma suíte de edição de vídeo não linear desenvolvida originalmente pela Pinnacle Systems. Lançado no final dos anos 90, o Presto foi uma das primeiras soluções de edição de vídeo digital amplamente adotadas por profissionais. Com o tempo, diferentes versões do software foram lançadas, cada uma trazendo melhorias e novas funcionalidades.
Cracked versions are often unstable. Imagine losing an entire construction tender because the "repacked" executable crashed. Legal Liability:
If you are a student or teacher, contact Presto’s sales department directly. Many software companies, including Presto, offer to verify your academic status via a .edu email or student ID.
To understand the keyword, let’s break it down into three parts:
: Modernized screens are accessible from any standard web browser, including those on tablets and smartphones (iPads, iPhones, etc.).
: Using pirated professional software violates copyright laws and software license agreements. Recommended Action
Let’s reframe the word "codigos." Instead of looking for stolen serials, look for .
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.
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.