• Join
  • Sign In with my.TI Login
Texas Instruments
  • Products
  • Applications
  • Tools & Software
  • Support & Community
  • Sample & Buy
  • About TI
Sample & Purchase Cart Sample & Purchase Cart
  • Search
  • Advanced
TI E2E™ Community
  • Support Forums
  • Blogs
  • Groups
  • Videos
  • 简体中文
  • More ...
TI Home » TI E2E Community » Support Forums » Embedded Software » StarterWare » StarterWare forum » IRQ FIQ USB
Share
StarterWare
  • Forum
Options
  • Subscribe via RSS

IRQ FIQ USB

IRQ FIQ USB

This question is answered
brad badke
Posted by brad badke
on Jul 05 2012 23:24 PM
Intellectual760 points

Is it possible to put the Sitara (AM335x) USB on the FIQ?

Further, is there a problem with enabling/disabling the FIQ on the Cortex A8 in the Sitara? It seems I am able to disable the IRQ using

mrs     r0, CPSR
orr     r0, #0x80
msr     CPSR_c, r0

But disabling the FIQ using

MRS     r0, CPSR
ORR     r0, #0x40
MSR     CPSR_c, r0

Seems to fail. It is like the FIQ bit in the Cortex A8 is stuck on. And yes I am in a Privileged (System) mode when I try this.

 

USB FIQ IRQ
Report Abuse
  • Reply
You have posted to a forum that requires a moderator to approve posts before they are publicly available.
All Replies
  • Baskaran Chidambaram
    Posted by Baskaran Chidambaram
    on Jul 05 2012 23:56 PM
    Expert4385 points

    Brad,

           FIQ is not supported in AM335x. You can configure the priority of IRQ interrupts.

    Regards

    Baskaran

    Report Abuse
    • Reply
    You have posted to a forum that requires a moderator to approve posts before they are publicly available.
  • brad badke
    Posted by brad badke
    on Jul 06 2012 00:03 AM
    Intellectual760 points

    That confuses me. It is discussed quite a bit in TRM spruh73f.pdf

    Report Abuse
    • Reply
    You have posted to a forum that requires a moderator to approve posts before they are publicly available.
  • brad badke
    Posted by brad badke
    on Jul 06 2012 18:31 PM
    Intellectual760 points

    Is it possible you just meant starterWare or perhaps USB not working with FIQ --- or did you mean the entire AM335x?

    Report Abuse
    • Reply
    You have posted to a forum that requires a moderator to approve posts before they are publicly available.
  • Baskaran Chidambaram
    Posted by Baskaran Chidambaram
    on Jul 09 2012 13:22 PM
    Verified Answer
    Verified by Baskaran Chidambaram
    Expert4385 points

    Brad,

              It is not the limitation of StarterWare but AM335x. FIQ is not available in AM335x as it is assigned for Security (which is not supported in AM335x). I will work with the corresponding internal team to update the TRM.

    Regards

    Baskaran

    Report Abuse
    • Reply
    You have posted to a forum that requires a moderator to approve posts before they are publicly available.
  • Martin Dahlberg
    Posted by Martin Dahlberg
    on Sep 20 2012 03:41 AM
    Prodigy10 points

    Baskaran,

    This is was a real setback. When is the TRM scheduled to be updated?

    Regards,

    Martin

    Report Abuse
    • Reply
    You have posted to a forum that requires a moderator to approve posts before they are publicly available.
TI E2E™ Community
  • Support Forums
  • Blogs
  • Videos
  • Groups
  • Site Support & Feedback
  • Settings
TI E2E™ Community Groups
  • TI University Program
  • Make the Switch
  • Microcontroller Projects
  • Motor Drive & Control
Other Communities
  • Deyisupport
  • Designsomething.org
  • beagleboard.org
  • TI on Element 14
  • TI on TechXchangeSM
Other Technical & Support Resources
  • WEBENCH® Design Center
  • Product Information Centers
  • Technical Documents
  • TI Design Network
  • TI Technical Articles
  • TI Training

All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

Follow Us Texas Instruments on Facebook Texas Instruments on Twitter Texas Instruments on LinkedIn Texas Instruments on Google+
TI Worldwide | Contact Us | my.TI Login | Site Map | Corporate Citizenship | mobile m.ti.com (Mobile Version)

TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.

© Copyright 1995-2013 Texas Instruments Incorporated. All rights reserved.
Trademarks | Privacy Policy | Terms of Use