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FreeRTOS freezes
http://www.at91.com/samphpbb/viewtopic.php?f=25&t=2260		 Page 1 of 1
Author:  myval [ Tue Oct 31, 2006 8:21 pm ]
Post subject:  FreeRTOS freezes
Hi,

I am having strange problem (at least in my point of view).
When I do this:
__arm void vRPM_ISR ( void )
{
xNewRPM = xTaskGetTickCount();

whole freertos kernell freezes.
When I chanege it to this:
__arm void vRPM_ISR ( void )
{

xNewRPM = xTickCount;

everything runs well. So the problem must be in xTaskGetTickCount function in here:
taskENTER_CRITICAL(); and taskEXIT_CRITICAL();

any explanation appreciated
Thanks
Josef
Author:  RichardBarry [ Wed Feb 28, 2007 12:55 am ]
Post subject: 
Only API functions that end in "FromISR" should be used within ISR's. GetTickCount() enters/exits a critical region and cannot therefore be used in an ISR.

Regards,
Richard.

+ http://www.FreeRTOS.org
A free real time kernel for 8, 16 and 32bit systems.

+ http://www.SafeRTOS.com
An IEC 61508 compliant real time kernel for safety related systems.
Author:  Lite [ Tue Sep 16, 2008 3:45 pm ]
Post subject: 
I've had the same problem; so i used
something like this to:

auxTime = xTickCount;

works fine (at least so far)

but is such an instruction safe
without the protection of the critical
region?

Thanks
Author:  RichardBarry [ Tue Sep 16, 2008 4:05 pm ]
Post subject: 
This should be fine as you are reading a 32bit value on a 32bit architecture.
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