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?
Priya Gamre believes that fashion plays a crucial role in her acting career. She enjoys experimenting with different looks to get into character, often working closely with costume designers to create a specific aesthetic for her roles.
Priya Gamre prioritizes her physical and mental well-being, often sharing her fitness routine and beauty tips on social media. She is an avid yoga practitioner and enjoys working out to maintain her physique. Her skincare routine involves a mix of traditional Indian remedies and modern products, focusing on natural ingredients and sun protection.
Priya Gamre has walked the red carpet at numerous events, turning heads with her stunning outfits. Whether it's a film premiere, a fashion show, or an awards ceremony, she always manages to make a statement with her fashion choices. Her go-to designers include top Indian labels like Manish Malhotra, Sabyasachi, and Anuradha Rao. She is particularly fond of intricate embroidery, bold colors, and statement pieces that add a touch of glamour to her outfits.
Priya Gamre's street style is a perfect blend of comfort and fashion. Whether she's running errands, meeting friends, or simply lounging around, she always looks put-together. Her everyday looks often feature distressed denim, graphic tees, and statement jackets – a testament to her laid-back yet stylish personality. When it comes to accessories, she favors simple yet elegant pieces like delicate necklaces, stud earrings, and classic handbags.
Priya Gamre has several exciting projects lined up, including a new web series and a Bollywood film. With her growing popularity, she is set to become a household name in the entertainment industry.
Priya Gamre's fashion and style are a perfect reflection of her personality – bold, confident, and effortlessly chic. With her growing popularity, she is sure to inspire fans and fashion enthusiasts alike. Whether she's walking the red carpet or simply running errands, Priya Gamre always manages to turn heads with her impeccable fashion sense. As she continues to make waves in the entertainment industry, we can't wait to see what the future holds for this talented actress and fashion icon.
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.