root/webserver/example/freeRTOSexample/Source/EnergyMeters/Meters_ISRs.c

#include "FreeRTOS.h"
#include "semphr.h"
#include "task.h"
#include "MetersIncludes.h"

extern xMetersSemaphore;
extern xTickCount; /* millisecond tick counter */

void handleGasMeterTick(void);

/* The interrupt entry point. */
void vP2_0_ISR_Wrapper( void ) __attribute__((naked));

/* The function that actually performs the interrupt processing.  This must be 
separate to the wrapper to ensure the correct stack frame is set up. */
void vP2_0_ISR_Handler( void );

void vP2_0_ISR_Handler( void )
{
  portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

  if ((IO2_INT_STAT_R & (1 << 10)) != 0) /* P2.10 interrupt triggered */
  {
    handleGasMeterTick();
  }
 // else if ((IO2_INT_STAT_R & (1 << n)) != 0) /* some other interrupt triggered */
  {
    ;
  }

  /* Clear the interrupt. */ 
  IO2_INT_CLR |= (1<<10);
  VICVectAddr = 0;

  /* Unblock the Meters task as data has arrived. */
  xSemaphoreGiveFromISR( xMetersSemaphore, &xHigherPriorityTaskWoken );

  if( xHigherPriorityTaskWoken )
   {
      /* If the Meters task was unblocked then calling "Yield from ISR" here
      will ensure the interrupt returns directly to the Meters task, if it
      is the highest priority read task. */
        portYIELD_FROM_ISR();
   }
}
/*-----------------------------------------------------------*/

void vP2_0_ISR_Wrapper( void )
{
        /* Save the context of the interrupted task. */
        portSAVE_CONTEXT();

        /* Call the handler function.  This must be separate from the wrapper
        function to ensure the correct stack frame is set up. */
        vP2_0_ISR_Handler();

        /* Restore the context of whichever task is going to run next. */
        portRESTORE_CONTEXT();
}

void handleGasMeterTick(void)
{
  meterItems[METER_INDEX_GAS].timeBeforeLastTick = meterItems[METER_INDEX_GAS].timeLastTick;     /* when did the tick before the last tick occur? */
  meterItems[METER_INDEX_GAS].timeLastTick = getEpochTimeWithMs(); /* when did the last tick occur? epoch (seconds) */
  meterItems[METER_INDEX_GAS].valueLastTick = 0;   /* what value did we have at the last tick? */
  meterItems[METER_INDEX_GAS].valueBeforeLastTick = 1;   /* what value did we have at the tick before the last tick? */
}