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] [May 2008 Threads] System hangs if I work without debugging toolPosted by Patrick DEFLANDRE on May 22, 2008 Hello,
I works for quite a while now with FreeRTOS, and I have made a design with an Atmel AT91SAM7X256. I had used for a starting point the lwIP_Demo_Rowley_ARM7 port, as I work with gcc on a Linux desktop.
I use several interrupts which interact with the OS by using the XX_from_ISR functions. I use the following at91sam7x device : aic, emac, pwm, spi, timer, serial, dbgu, twi.
All was very friendly until I tried to use my new design without any developping device. I found then with some fears that if I disconnect my JTAG Olimex Arm-usb-ocd from my developping board, the system become very unstable. Sometimes it works for few seconds, sometimes it crash immediately.
Firstly, I check my task's stack size, but it doesn't seem to be undersized.
Secondly, I thought about some noise problem, or interrupt problems. I found there could be spurious interrupts and add a new interrupt handler to manage them. As I put a counter in it and as it has not solve my problem, I know now it must be something else.
As it is very difficult to analyse a problem which arise only when you haven't debugging tools on the board, I am a little bit confuse.
Does anybody have some ideas on what I can check in my application. Any remarks or suggestions will be very useful for me.
Patrick
RE: System hangs if I work without debugging toolPosted by Dave on May 22, 2008 See - http://ccgi.rowley.co.uk/support/faq.php?do=article&articleid=52
RE: System hangs if I work without debugging Posted by Patrick DEFLANDRE on May 23, 2008 Hello davedoors,
I thank you for the link.
I try to attach to the target without reset it. It is a little bit different as Rowley tells to do it because I use Eclipse CDT IDE with Zylin CDT plugin.
My problem shouldn't be a problem of target startup reset, as the target works sometime for a while before crashes. And the bank start is select by a non volatil bit which select a boot from flash. I manage to attach the openocd server to the target, and I check that this bit is correctly set when the "crash" appears.
In the same way, I haven't any boot loader on my design, so it can't be the problem's reason.
When I use a telnet session for debugging with openocd, I can check that my target is block on a data abort or a fetch abort.
But I don't manage to attach the target from a gdb session with Eclipse. There is no problem if I reset the target on connection, but if I only attach to the target, I can't stop, step, resume the target. I think my Eclipse configuration isn't as good as it should... So it is difficult to know from where my application crash.
I will try some new tests on Monday, as I could'nt work on it this afternoon.
Thanks for your help.
Patrick.
RE: System hangs if I work without debugging Posted by Patrick DEFLANDRE on May 26, 2008 So, I find my mistake.
I had inadvertently remove the AT91C_BASE_MC->MC_FMR register initialisation.
When I used my flash script loader, his value was set with an openocd command, and all seem's to go well.
But if I make an hard reboot or a power on, the MC_FMR was cleared by default to 0x0000 0000, so the micro controller tried to run without any wait state on a 48 MHz master clock, which lead rapidly to a program or data abort.
Shame on me !
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.
|