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] FreeRTOS tasks can interrupt USB stack implementation?Posted by ddudas on September 24, 2015 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
FreeRTOS tasks can interrupt USB stack implementation?Posted by rtel on September 24, 2015 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?
FreeRTOS tasks can interrupt USB stack implementation?Posted by ddudas on September 24, 2015 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?
FreeRTOS tasks can interrupt USB stack implementation?Posted by rtel on September 24, 2015 : Playable on Dolphin Emulator , modded Wii consoles, or Wii U .
Here’s a draft feature:
Requires a homebrewed Wii/Wii U or the Dolphin emulator and a legal copy of the original game to patch. 🛠️ How to Play (Legally) Dump your ISO: Use a homebrewed Wii to back up your retail disc. Get the Patch: Download the .riivolution patch from reputable community sites like Apply Patch: Use a tool like Wiimms ISO Tools RomPatcher to combine your legal ISO with the mod files. Play via the Riivolution app on real hardware or load the patched ISO in ⚠️ Safety Warning
New Super Mario Bros. Wii: Retro Remix is a popular ROM hack that merges the modern gameplay engine of the Wii title with the aesthetic and level design of classic 8-bit and 16-bit entries. Key Features
The development of Retro Remix, often attributed to groups like the SMB Team , highlights the shift from passive consumption to active creation in the gaming industry. Unlike official releases, these hacks often include experimental elements such as "gimmick jumps" or intentional warps that challenge veteran players. The mod even supports four-player cooperative play , a feature not present in the original 1985 game, effectively modernizing the social aspect of retro gaming. Accessibility and Cultural Impact
A backup of your New Super Mario Bros. Wii (ISO or WBFS format).
FreeRTOS tasks can interrupt USB stack implementation?Posted by ddudas on September 24, 2015 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.
|