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Increment epoch time from vTickISR

Posted by savindra on March 1, 2017

Hi ,

I am following below method to sync my external RTC with internal timer. Incrementing epoch millliseconds from vTickISR.

But i want to sync my epoch milliseconds with external RTC just after my system startsup. But vTickISR is called when FreeRTOS scheduler is started so i have to wait till scheduler is started. Is there any function in FreeRTOS that can tell me that scheduler is started so that once scheduler is started i can sync my epcohms with RTC and it keep on incrementing just after syncing.

LiBIncEpochTime() { g_ulEpochMs++; }

pragma interrupt ( vTickISR( vect = VECT( configTICKVECTOR ), enable ) )

void vTickISR( void ) { / Increment the tick, and perform any processing the new tick value necessitates. / ///increment epoch seconds LIBIncEpochTime();

setipl( configMAXSYSCALLINTERRUPTPRIORITY );
{
	if( xTaskIncrementTick() != pdFALSE )
	{
		taskYIELD();
	}
}
setipl( configKERNELINTERRUPTPRIORITY );

}*

Regards, Savindra


Increment epoch time from vTickISR

Posted by rtel on March 1, 2017

Look at line 552 (at the time of writing) in the following file.

https://sourceforge.net/p/freertos/code/HEAD/tree/trunk/FreeRTOS/Source/timers.c

If you set configUSEDAEMONTASKSTARTUPHOOK to 1 you must provide an implementation of:

void vApplicationDaemonTaskStartupHook( void );

Assuming the timer task is the highest priority task in the system - which is normally the case - then vApplicationDaemonTaskStartupHook() will get called once when the first task starts executing.

Does that meet your needs?


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