Arm Community
Site
Search
User
Site
Search
User
Groups
Arm Research
DesignStart
Education Hub
Graphics and Gaming
High Performance Computing
Innovation
Multimedia
Open Source Software and Platforms
Physical
Processors
Security
System
Software Tools
TrustZone for Armv8-M
中文社区
Blog
Announcements
Artificial Intelligence
Automotive
Healthcare
HPC
Infrastructure
Innovation
Internet of Things
Machine Learning
Mobile
Smart Homes
Wearables
Forums
All developer forums
IP Product forums
Tool & Software forums
Support
Open a support case
Documentation
Downloads
Training
Arm Approved program
Arm Design Reviews
Community Help
More
Cancel
Developer Community
Tools and Software
Software Tools
Jump...
Cancel
Software Tools
Arm Development Studio forum
LR Contents upon IRQ Handler in Cortex-M3
Tools, Software and IDEs blog
Forums
Videos & Files
Help
Jump...
Cancel
New
Replies
2 replies
Subscribers
127 subscribers
Views
3558 views
Users
0 members are here
Related
LR Contents upon IRQ Handler in Cortex-M3
Offline
Muhammad Ahsan
over 7 years ago
Note: This was originally posted on 16th June 2011 at http://forums.arm.com
Hi,
I am with Cortex-M3 and I have implemented a function that calcultes CRC using DMA and upon the completion of this calculation and Interrupt is generated. As soon as the program jumps to the IRQ handler, the content of LR register becomes 0xFFFFFFF9 which causes the program to get lost upon the complete execution of IRQ handler.
In order to verify, whether the LR is loaded with same 0xFFFFFFF9 in case of entering some other IRQ, I have implemented another function, in which FRT counter counts and upon overflow jumps to the corresponding IRQ handler. I have observed that the LR contents are also changed to 0xFFFFFFF9.
Is there anything that I am missing in regard to implement and handle interrupts in Cortex-M3?
Suggestions will highly be appreciated!!!
Regards,
More questions in this forum
By title
By date
By reply count
By view count
By most asked
By votes
By quality
Descending
Ascending
All recent questions
Unread questions
Questions you've participated in
Questions you've asked
Unanswered questions
Answered questions
Questions with suggested answers
Questions with no replies
Not Answered
Forum FAQs
0
ARM Community
2518
views
0
replies
Started
1 month ago
by
Annie Cracknell
Not Answered
Use Arm DS5 streamline performance analyzer on TX2
0
1048
views
4
replies
Latest
2 days ago
by
ShirB
Not Answered
index are changing with the voltage apply to the adc
0
214
views
0
replies
Started
2 days ago
by
Vishal_Patel
Not Answered
Extended asm alternative for Arm Compiler 5 (memory barriers)
0
Memory Management Unit (MMU)
Arm Assembly Language (ASM)
Arm Compiler 5
221
views
0
replies
Started
5 days ago
by
StoneCold
Not Answered
Problem with arm_cmplx_mag_f32()
0
881
views
2
replies
Latest
10 days ago
by
Vishal_Patel
>
View all questions in Arm Development Studio forum