TMS570 get time stamp, edge interrupts

I'm using the TMS570ls20216spge and I am outputting a 10 us pulse and  trying to read an echo pulse using the HET12 and HET14 respectively.  I used RTI to generate the 10 us pulse and have edge interrupts for edge 0 for rising edge and edge 1 for falling edge.  The echo is from a sonar range finder srf04.  I am able to read how many times each edge occurs using edgeGetCounter but the interrupt only fires one time and records the time stamp.  I tried to reset the edge counter after entering the interrupt but still only ran once but the edge counter is counting continuously as it should.  Also the timestamp returns a loop count.  How do you convert the count to a specific time?  Here is what I have done so far.

gioSetDirection(hetPORT, 0x00001FFF);

    // Enable RTI Compare 0 interrupt notification /
    rtiEnableNotification(rtiNOTIFICATION_COMPARE0);
    edgeEnableNotification(edge0);
    edgeEnableNotification(edge1);

_enable_FIQ();

    // Start RTI Counter Block 0 /
    rtiStartCounter(rtiCOUNTER_BLOCK0);

void edgeEnableNotification(unsigned edge)
{
    unsigned int time, time2, reset = 0;
    switch(edge)
    {
        case 0:
        {
            time = hetGetTimestamp();
            break;
        }
       
        case 1:
        {
            time2 = hetGetTimestamp();
            reset = 3;
            break;
        }
    }

    if(reset == 3)
    {
        edgeResetCounter(edge0);
        edgeResetCounter(edge1);
    }
    final = time2 - time;
}