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

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
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An IEC 61508 compliant real time kernel for safety related systems.

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

This should be fine as you are reading a 32bit value on a 32bit architecture.